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MAXIM MAX4223 MAX4228 1GHz Low-Power SOT23 Current-Feedback Amplifiers with Shutdown handbook

1. 1V V 8 0 5600 10 20 g 30 Voc 5 40 50 60 70 80 90 0 01 0 1 1 10 100 FREQUENCY MHz SHUTDOWN MODE OUTPUT ISOLATION vs FREQUENCY SHUTDOWN MODE OUTPUT ISCLATION dB FREQUENCY MHz MAX4224 M AX4227 M AX4228 TOTAL HARMONIC DISTORTION vs FREQUENCY Ri 1500 30 MAXA223 19 40 50 60 THD 70 80 90 00 FREQUENCY MHz GB THD dBc THD dBc Typical Operating Characteristics continued Vcc 5V VEE 5V RL 1000 Ta 25 C unless otherwise noted 30 40 50 60 70 80 90 30 40 50 60 70 80 90 100 MAX4224 M AX4227 M 4228 POWER SUPPLY REJECTION RATIO vs FREQUENCY AvcL 2 223 14 0 1 1 10 100 FREQUENCY MHz MAX4223 M AX4225 M AX4226 TOTAL HARMONIC DISTORTION vs FREQUENCY R
2. PIN MAX4223 MAX4224 Mi MAX4226 MAX4228 NAME FUNCTION SOT23 so 50 50 No Connect Not internally 1 5 5 7 8 10 N C connected Tie to GND for optimum AC performance 1 6 OUT Amplifier Output 2 4 Vee Connectto SV IN Amplifier Noninverting Input IN Amplifier Inverting Input Amplifier Shutdown Connect s s D EUN eee power shutdown 6 7 10 7 Voc Volage Connect fo aV 1 1 1 OUTA Amplifier A Output 2 2 2 INA Amplifier A Inverting Input 3 3 3 INA Amplifier A Noninverting Input 5 7 11 INB Amplifier B Noninverting Input 6 8 12 INB Amplifier B Inverting Input 7 9 13 OUTB Amplifier B Output Amplifier A Shutdown Input 5 6 SHDNA peration Connect to GND for low power shutdown mode Amplifier B Shutdown Input 6 SHONE peration Connect to GND for low power shutdown mode AVLAX LAO 8CCVUXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Detailed Description The MAX4223 MAX4228 are ultra high speed low power current feedback amplifiers featuring 3dB bandwidths up to 1GHz 0 1dB gain flatness up to 300MHz and very low differential gain and phase errors of 0 01 and 0 02 respectively These devices operate on dual 5V or 3V power supplies and require onl
3. MAXI MI MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228 Figure 1 Current Feedback Amplifier Low Power Shutdown Mode The MAX4223 MAX4224 MAX4226 MAX4228 have a shutdown mode that is activated by driving the SHDN input low When powered from 5V supplies the SHDN input is compatible with TTL logic Placing the amplifier in shutdown mode reduces quiescent supply current to typical and puts the amplifier output into a high impedance state 100kQ typical This feature allows these devices to be used as multiplexers in wideband systems To implement the mux function the outputs of multiple amplifiers can be tied together and only the amplifier with the selected input will be enabled All of the other amplifiers will be placed in the low power shutdown mode with their high output impedance pre senting very little load to the active amplifier output For gains of 2 or greater the feedback network imped ance of all the amplifiers used in a mux application must be considered when calculating the total load on the active amplifier output Applications Information Layout and Power Supply Bypassing The MAX4223 MAX4228 have an extremely high band width and consequently require careful board layout including the possible use of constant impedance microstrip or stripline techniques MAXIM 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown To realize the full AC performance of these h
4. 100mV OUTPUT 100mV 2V OUTPUT 2V 4223 4225 AX4226 ALL SIGNAL PULSE RESPONSE AvcL 1 MAX4223 22 TIME 10ns div 4224 4227 4228 SM ALL SIGNAL PULSE RESPONSE AycL 2 CL 10pF MAX4223 25 TIME 10ns div MAX4224 MAX4227 M AX4228 LARGE SIGNAL PULSE RESPONSE 2 4223 28 TIME 10ns div AVLAX LAO 1 GND GND GND GND GND GND 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Typical Operating Characteristics continued Vcc 5V VEE 5V RL 1000 Ta 25 C unless otherwise noted 100mV INPUT 100mV 100mV OUTPUT 100mV INPUT 2V 2V OUTPUT 2V 2V OUTPUT 2V MAX4223 MAX4225 MAX4226 SM ALL SIGNAL PULSE RESPONSE 1 25pF MAX4223 23 TIME 10ns div MAX4223 M AX4225 M AX4226 LARGE SIGNAL PULSE RESPONSE AvcL 1 MAX4223 26 TIME 10ns div MAX4224 M AX4227 M AX4228 LARGE SIGNAL PULSE RESPONSE 2 CL 10pF TIME 10ns div GND GND GND GND GND 50mV INPUT 50mV 100mV OUTPUT 100mV 21 INPUT 2V 2V OUTPUT 2V 400mV INPUT 400mV 2V GND OUTPUT 2V MAX4224 MAX4227 MAX4228 SM ALL SIGNAL PULSE RESPONSE AvcL 2 MAX4223 24 B 8CCVUXVIN ECCVXVIN TIME 10ns d
5. E NINE ZA ae 4 LUATION KIT MI AALS 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown General Description The 4223 4228 current feedback amplifiers combine ultra high speed performance low distortion and excellent video specifications with low power oper ation The MAX4223 MAX4224 MAX4226 MAX4228 have a shutdown feature that reduces power supply current to 350pA and places the outputs into high impedance state These devices operate with dual sup plies ranging from 2 85V to 5 5V and provide a typical output drive current of 80mA The MAX4223 MAX4225 MAX4226 are optimized for a closed loop gain of 1 OdB or more and have a 3dB bandwidth of 1GHz while the MAX4224 MAX4227 MAX4228 are compensated for a closed loop gain of 2 6dB or more and have a 3dB bandwidth of 600MHz 1 2GHz gain bandwidth product The MAX4223 MAX4228 are ideal for professional video applications with differential gain and phase errors of 0 01 and 0 02 0 1dB gain flatness of 300MHz and a 1100V us slew rate Total harmonic distortion THD of 60dBc 10MHz and an 8ns settling time to 0 1 suit these devices for driving high speed analog to digital inputs or for data communications applications The low power shutdown mode on the MAX4223 MAX4224 MAX4226 MAX4228 makes them suitable for portable and battery powered applications Their high output impedance in shutdown mode is excellent for multiplex in
6. 498 REF TOP VIEW a 0 6 0 6 E p GAGE Fe Li PLANE c Eg a ud J r 1 L1 FRONT VIEW SIDE VEW NOTES MAIAXAI VI 1 D amp E DO NOT INCLUDE MOLD FLASH PROPRIETARY INFORMATION 2 MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 1Smm 006 CONTROLLING DIMENSION INCHES PACKAGE OUTLINE 10L MICRO MAX PREVA CONTROL NI 21 0061 A 9 E 0 80 7 SYMBOL MIN MAX 5 0 90 145 z L Al 0 00 015 e F Fe f A2 090 130 lt b 035 050 a 008 020 SEE NOTE 5 SS Bests EXAMPLE E 260 300 150 175 TOP MARK L 0 35 055 E El e 0 95 REF a 0 10 a PIN 1 7 LD DOT SEE NOTE 6 PIN 1 On eC D NOTE 1 ALL DIMENSIONS ARE IN MILLIMETERS FOOT LENGTH MEASURED AT INTERCEPT POINT BETWEEN DATUM A amp LEAD SURFACE 3 PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH amp METAL Ae BURR A 4 PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING 5 PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK 4 F FROM LEFT TO RIGHT SEE EXAMPLE TDP MARK 6 PIN 1 LD DOT IS 03 MM MIN LOCATED ABOVE id PIN 1 AVI PACKAGE OUTLINE SOT23 6L APRIL COWL T 21 0058 1 4 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied Maxim product No circuit patent licenses implied Maxim reserves the right to change the circuitry and specifications without notice at any t
7. in amps RG gain setting resistor in feedback resistor in Rs source resistor in Q The following equation represents output noise density Ed s m x Rg in x Re Hen where in input noise current density in pA VHz input noise voltage density in nV VHz The MAX4223 MAX4228 have a very low 2nV NHz noise voltage The current noise at the noninverting input in is 3pA VHz and the current noise at the inverting input in is 20pA VHz An example of DC error calculations using the MAX4224 typical data and the typical operating circuit with RF RG 4700 Rr RG 2359 and Rs 500 gives 5 x 10 4 x 1 1 2x 10 6 x 50 x 1 1 4 x 10 6 x 470 VOUT 3 1mV Calculating total output noise in a similar manner yields the following n OUT 1 1 x s x 10712 x 50 2 2 2 20 10 12 x 235 2 x 1079 en oUT 10 2nV 4Hz 12 MAXIM MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228 Figure 2 Output Offset Voltage With a 600MHz system bandwidth this calculates to 250y0VnMs approximately 1 5mVp p using the six sigma calculation Communication Systems Nonlinearities of components used in a communication system produce distortion of the desired output signal Intermodulation distortion IMD is the distortion that results from the mixing of two input signals of different frequencies in a nonl
8. 49 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown RG RF e eco SHON VCC Figure 7a Maxim SOT23 High Speed Evaluation Board Component Placement Guide Component Side Figure 7b Maxim SOT23 High Speed Evaluation Board Figure 7c Maxim SOT23 High Speed Evaluation Board PC Board Layout Component Side PC Board Layout Back Side V6 MAAK 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown SPY Purse os 060000 0 6 os VEE CNO Figure 8a Maxim SO 8 High Speed Evaluation Board Component Placement Guide Component Side Figure 8b Maxim SO 8 High Speed Evaluation Board PC Board Layout Component Side PC Board Layout Back Side Figure 8c Maxim SO 8 High Speed Evaluation Board MAXIMA 7 8CCVUXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Pin Configurations continued TOP VIEW MAXIM MAXIMA MAX4223 MAX4225 MAX4224 MAX4227 MAXIM MAXIM MAX4226 MAX4226 MAX4228 MAX4228 MAXIM 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown _Ordering Information continued Chip Information onm TEMP RANGE PINE SOT MAX4223 MAX4224 TRANSISTOR COUNT 87 PACKAGE TOPMARK MAX4225 MAX4228 TRANSISTOR COUNT 171 MAX4224EUT T 40 C to 85 C 6 SOT23 AAAE SUBS
9. 5V SHDN 5V Vom OV Av 1V V for MAX4223 MAX4225 MAX4226 Av 2V V for MAX4224 MAX4227 MAX4228 RL 100Q Ta 25 C unless otherwise noted Note 4 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Impedance ZOUT f 10kHz 2 Q 2 f 30kHz MAX4223 5 6 42 Third Order Intercept IP3 dBm P fz 30 1MHz MAX4224 7 8 36 Spurious Free Dynamic Range SFDR f 10kH pera Bl dB 1 2 7 g 4224 7 8 62 1dB Gain Compression f 10kHz 20 dBm Input Noise Voltage Density f 10kHz 2 2 IN 3 Input Noise Current Density int in f 10kHz 20 pA NHz SO 8 SO 14 Pin to pin 0 3 packages Pin to GND 1 0 Input Capacitance Note 7 CIN pF SOT23 6 10 uMAX Pin to pin 0 3 packages Pin to GND 0 8 Note 1 Note 2 Note 3 Note 4 The MAX422_EUT is 100 production tested at Ta 25 C Specifications over temperature limits are guaranteed by design Absolute Maximum Power Dissipation must be observed Does not include impedance of external feedback resistor network AC specifications shown are with optimal values of RF and Ra These values vary for product and package type and are tabulated in the Applications Information section of this data sheet The AC specifications shown are not measured in a production test environment The minimum AC specifications given are based on the combination of worst case design simulations along
10. FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz 4 MAKIN 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Typical Operating Characteristics continued Vcc 5V VEE 5V RL 1000 Ta 25 C unless otherwise noted MAX4224 MAX4224 MAX4224 MAX4227 MAX4228 SM ALL SIGNAL GAIN vs FREQUENCY SM ALL SIGNAL GAIN vs FREQUENCY LARGE SIGNAL GAIN vs FREQUENCY 2 5 10 AvcL 2 4 4 9 4 8 Vin 20mVp p Y Vin 20mVp p 2V V RI
11. resents the amplifier s true AC performance Some Re 8 8 amp 111177 3dB BANDWIDTH MHz 8 RISING EDGE SLEW RATE V us Figure 5c MAX4223 Rising Edge Slew Rate Distribution 14 manufacturers guarantee AC specifications without clearly stating how this guarantee is made The MAX4223 MAX4228 AC specifications are derived from worst case design simulations combined with a sample characterization of 100 units The AC mance distributions along with the worst case simula tion limits are shown in Figures 5 and 6 These distributions are repeatable provided that proper board layout and power supply bypassing are used see Layout and Power Supply Bypassing section 9888859 RS 8 88 0 1dB BANDWIDTH MHZ FALLING EDGE SLEW RATE V us Figure 5d MAX4223 Falling Edge Slew Rate Distribution MAXIM 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown 0 1dB BANDWIDTH MHz 8CCVUXVIN ECCVXVIN amp 8 8 8 ge RISING EDGE SLEW RA Figure 6 MAX4224 Rising Edge Slew Rate Distribution Figure 6d MAX4224 Falling Edge Slew Rate Distribution MAKIM _ ee ee
12. L 1500 VN MAXA223 17 2ND HARMONIC SRD HARMONIC 1 0 100 FREQUENCY MHz MAX4224 MAX4227 MAX4228 TOTAL HARMONIC DISTORTION vs FREQUENCY Ri 1 223 20 2ND HARMONIC 0 1 3RD HARMONIC 1 0 00 FREQUENCY MHz THD Bx THIFD CRDER INTERCEPT dBm 100 30 40 50 60 70 80 90 100 55 50 45 40 35 30 25 20 OUTPUT IMPEDANCE vs FREQUENCY MAXA223 15 gt lt az res lt a lt 3 s S O 0 01 0 1 1 10 00 FREQUENCY MHz MAX4223 MAX4225 MAX4226 TOTAL HARMONIC DISTORTION vs FREQUENCY RI 1kQ MAxA223 18 0 1 1 0 100 FREQUENCY MHz TWO TONE THIRD ORDER INTERCEPT vs FREQUENCY 223 21 MAX4224 7 8 10 20 30 40 50 60 70 80 90 100 FREQUENCY MHz MAXIM 100mV INPUT 100mV 100mV OUTPUT 100mV 50 INPUT 50
13. R SYMBOL CONDITIONS MIN TYP MAX UNITS 3dB Small Signal Bandwidth MAX4223 5 6 750 1000 Note 5 i Fie s ma MAX4224 7 8 325 600 Bandwidth for 0 1dB MAX4223 5 6 100 300 Gain Flatness Note 5 VOUT MAX4224 7 8 60 200 nee Gain Peaking MAX4223 5 6 1 5 dB MAX4224 7 8 0 1 MAX4223 5 6 250 Large Signal Bandwidth BWLs VouT 2Vp p 422477 8 330 2 T MAX4223 5 6 850 1100 Rising edge Slew Rate Note 5 SR VouT 4V step clic 1400 1700 V us 5 MAX4223 5 6 625 800 Falling edge MAX4224 7 8 1100 1400 4223 5 6 8 Settling Time to 0 1 ts VouT 2V step 4224 7 8 ns Rise and Fall Time tr tf VouT 2V step Meee m ns MAX4224 7 8 1 0 Off Isolation SHDN OV f 10MHz MAX4223 4 6 8 65 dB f 30MHz MAX4225 6 68 Crosstalk XTALK Rs 500 MAX4227 8 79 Turn On Time from Shutdown tON MAX4223 4 6 8 2 us Turn Off Time to Shutdown toFF MAX4223 4 6 8 300 ns Power Up Time 10 Vcc OV to 5V step 100 ns Differential Gain Error DG RL 1500 Note 6 wens cau 96 MAX4224 7 8 0 02 Differential Phase Error DP RL 1500 Note 6 Meee one degrees MAX4224 7 8 0 01 R 1000 MAX4223 5 6 60 Total Harmonic Distortion THD Vour 2Vp p MORES 81 10 2 4223 5 6 65 RL 1kQ 4224 7 8 78 3 8CCVUXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown AC ELECTRICAL CHARACTERISTICS continued Vcc Vee
14. TRATE CONNECTED TO VEE MAX4224ESA 40 C to 85 C 850 4225 5 40 C to 85 C 850 MAX4226EUB 40 C to 85 C 10 uMAX MAX4226ESD 40 C 85 14 SO MAX4227ESA 40 C to 85 C 850 MAX4228EUB 40 C to 85 C 10 uMAX MAX4228ESD 40 C to 85 C 14 SO 19 8 MAX4223 MAX4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Package Information s INCHES MILLIMETERS E DIM MIN MAX MIN d 0037 0043 0 939 1092 1 0 002 0 006 0 051 0 152 A2 0 030 0 038 0 762 0 965 Dil 0124 2 845 3150 Ej D 0110 0122 2794 3099 El oiie 0124 2845 3150 be 02 2 0 10 0122 2 794 3099 E 0185 0201 4699 5105 L 00155 00275 0 394 0 699 L1 0 037 REF 0 940 b 0 007 0 0106 0177 0270 00197 BSC 500 BSC e 0 0035 0 0078 0 090 0 200 0 020 5 S 00196 REF
15. VIV ne 2 2 Rud 2 Vour 2Vp p F 9 1 Rg 62Q 8 i z z z 0 0 0 B 8 P 2 Ayo 0 2 1300 3 SO 8 PACKAGE 3 150 4 Rg 4700 4 4 SOT23 6 PACKAGE 5 Rr Rg 4700 3 6 6 6 1 0 00 1000 1 10 100 1000 1 10 100 1000 FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz MAX4225 M AX4226 MAX4225 M AX4226 MAX4227 MAX4228 SMALL SIGNAL GAIN vs FREQUENCY GAIN MATCHING vs FREQUENCY SM ALL SIGNAL GAIN vs FREQUENCY 1 1 AvcL 2 4 5 04 4 8 Vin 20mVp p Vin 20mVp p 3 Avo e 03 3 2V V 2 Rr 5602 02 2 LRe Ra 4700 g 1 04 1 8 0 Z 4 01 R 2 02 2 3 03 3 04 4 5 05 5 6 06 6 1 0 00 1000 1 10 100 1 10 100 1000 FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz MAX4227 MAX4228 GAIN MATCHING vs FREQUENCY MAX4225 MAX4226 MAX4227 MAX4228 Avci 2 CROSSTALK vs FREQUENCY CROSSTALK vs FREQUENCY 0 z Vin 20 Rs 500 Rs 500 2V V 10 F Vout 2Vp p 10 F Vour 2Vp p 2 Pr Ro 4700 20 i 20 g 30 30 z 7 8 g 40 5 40 B o 50 50 0 60 1 60 0 70 70 80 80 90 90 100 100 1 0 00 1000 1 0 00 1000 FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz MAKIM 5 8CCVXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown MAX4223 MAX4225 MAX4226 POWER SUPPLY REJECTION RATIO vs FREQUENCY 1
16. citor at the power supply pins point of entry to the PC board to ensure the integrity of incoming supplies The power supply trace should lead directly from the tantalum capacitor to the Vcc and Vee pins To minimize para sitic inductance keep PC traces short and use surface mount components The N C pins should be connected to a common ground plane on the PC board to minimize parasitic coupling If input termination resistors and output back termina tion resistors are used they should be surface mount types and should be placed as close to the IC pins as possible Tie all N C pins to the ground plane to mini mize parasitic coupling AVLAX LAW Choosing Feedback and Gain Resistors As with all current feedback amplifiers the frequency response of these devices depends critically on the value of the feedback resistor Rr Rr combines with an internal compensation capacitor to form the dominant pole the feedback loop Reducing Rr s value increases the pole frequency and the 3dB bandwidth but also increases peaking due to interaction with other nondominant poles Increasing RF s value reduces peaking and bandwidth Table 1 shows optimal values for the feedback resistor RF and gain setting resistor RG for the 4223 MAX4228 Note that the MAX4224 MAX4227 MAX4228 offer superior AC performance for all gains except unity gain OdB These values provide optimal AC response using surface mount resistors and good layout t
17. d under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability DC ELECTRICAL CHARACTERISTICS Vcc 5V 5V SHDN 5V Vom OV RL TA TMIN to Tmax unless otherwise noted Typical values are at TA 25 Note 1 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX4223 MAX4224 0 5 4 25 C MAX4225 MAX4228 0 5 5 Input Offset Voltage Vos mV 1 T 4223 4224 6 A MAX MAX4225 MAX4228 7 Input Offset Voltage Drift TCVos 2 Input Bias Current 25 2 10 Positive Input TA TMIN to TMAX 15 i 4223 4224 4 20 25 Input Bias Current T MAX4225 MAX4228 t4 25 Negative Input i CE MAX4223 MAX4224 30 m A MINIO MAX MAX4225 MAX4228 35 Input Resistance Positive Input RIN 700 kQ Input Resistance Negative Input RIN 45 Q input Common M d VcM Inferred from CMRR test 25 32 Voltage Range ma 25 55 61 Common Mode Rejection Ratio CMRR 2 5V dB TA TMIN to TMAX 50 Operating Supply Voltag
18. dering Information continued at end of data sheet Selector Guide AMPS SHUT MIN PIN PART PER DOWN GAIN PKG MODE PACKAGE MAX4223 1 1 Yes 6 SOT23 8 SO MAX4224 2 1 Yes 6 SOT23 8 SO MAX4225 1 2 No 8 SO 10 MAX MAX4226 1 2 Yes 14 SO MAX4227 2 2 NO 8 SO 10 uMAX MAX4228 2 2 Yes 14 SO Maxim Integrated Products 1 For free samples amp the latest literature http www maxim ic com or phone 1 800 998 8800 For small orders phone 408 737 7600 ext 3468 8CCVUXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC to VEE sss 12V Analog Input Voltage 0 3V to Voc 0 3V Analog Input CUrtetib rette rtr tens 25 SHDN Input Voltage 0 3V to Vcc 0 3V Short Circuit Duration OUT O GND enti coed ined dace Continuous OUT t VCC Or VEE u u u 5sec Continuous Power Dissipation TA 70 C 6 SOT23 derate 7 1mMW C above 70 8 SO derate 5 9mW C above 70 10 Pin MAX derate 5 6mW C above 70 C 14 Pin SO derate 8 3mW C above 70 Operating Temperature Range Storage Temperature Range Lead Temperature soldering 10sec Stresses beyond those liste
19. e Vcc VEE Inferred from PSRR test 2 85 55 v Range ee Vcc 2 85V to 5 5V TA 25 68 74 Power Supply Rejection Ratio PSRR dB PR VEE 2 85V to 5 5V TMIN to TMAX 63 Quiescent Supply Current isy Normal mode SHDN 5V 6 0 9 0 mA per Amplifier Shutdown mode SHDN 0V 0 35 0 55 Open Loop Transresistance T 2 5V ee im MO P i R OUTE SE RL 500 03 08 Output Voltage Swing VOUT RL 500 2 5 2 8 V Output Current Note 2 loUT 2 5V 60 80 mA Short Circuit Output Current Isc RL short to ground 140 mA SHDN Logic Low VIL 0 8 V SHDN Logic High 2 0 V MAKINI Current Feedback Amplifiers with Shutdown 1GHz Low Power SOT23 DC ELECTRICAL CHARACTERISTICS continued Voc 5V VEE 5V SHDN 5V Vom RL TA TMIN to TMAX unless otherwise noted Typical values are at Ta 25 C Note 1 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SHDN Input Current SHDN OV or 5V 25 70 Shutdown Mode Output SHDN OV 2 5V to 2 5V 10 100 kQ Impedance Note 3 AC ELECTRICAL CHARACTERISTICS Vcc 5V Vee 5V SHDN 5V Vom OV Ay 1V V for MAX4223 MAX4225 MAX4226 Ay 2V V for MAX4224 MAX4227 MAX4228 RL 100Q Ta 25 C unless otherwise noted Note 4 PARAMETE
20. eally suited for use as buffer amplifiers in high speed ADC applications Video Line Driver The MAX4223 MAX4228 are optimized to drive coaxial transmission lines when the cable is terminated at both ends as shown in Figure 3 Note that cable frequency response may cause variations the signal s flatness Driving Capacitive Loads A correctly terminated transmission line is purely resis tive and presents no capacitive load to the amplifier Although the 4223 4228 are optimized for AC performance and are not designed to drive highly capacitive loads they are capable of driving up to 25pF without excessive ringing Reactive loads decrease phase margin and may produce excessive ringing and oscillation see Typical Operating Characteristics Figure 4 s circuit reduces the effect of large capacitive loads The small usually 50 to 200 isolation resistor Riso placed before the reactive load prevents ringing and oscillation at the expense of a Rr 750 750 CABLE 75Q CABLE MAXIM 4223 4224 4225 4226 MAX4227 MAX4228 Figure 3 Video Line Driver AVLAX LAO small gain error At higher capacitive loads AC perfor mance is limited by the interaction of load capacitance with the isolation resistor Maxim s High Speed Evaluation Board Layout Figures 7 and 8 show a suggested layout for Maxim s high speed single amplifier evaluation boards These boards were developed using the tec
21. ech niques Maxim s high speed amplifier evaluation kits provide practical examples of such layout techniques Stray capacitance at IN causes feedback resistor decoupling and produces peaking in the frequency response curve Keep the capacitance at IN as low as possible by using surface mount resistors and by avoiding the use of a ground plane beneath or beside these resistors and the IN pin Some capacitance is unavoidable if necessary its effects can be counter acted by adjusting Rr Use 196 resistors to maintain consistency over a wide range of production lots Table 1 Optimal Feedback Resistor Networks GAIN GAIN Rr Rc pix Mw 40 Ana AW MAX4223 MAX4225 MAX4226 1 0 560 Open 1000 300 2 6 200 200 380 115 5 14 100 25 235 65 MAX4224 MAX4227 MAX4228 2 6 470 470 600 200 5 14 240 62 400 90 10 20 130 15 195 35 For the MAX4223EUT this optimal value is 470 11 8CCVUXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown DC and Noise Errors The MAX4223 MAX4228 output offset voltage VOUT Figure 2 can be calculated with the following equation Vout Vos x 1 Ig x Rs lg x Re RG where Vos input offset voltage in volts 1 RF RG amplifier closed loop gain dimensionless IB input bias current in amps IB inverting input bias current
22. g applications The single MAX4223 MAX4224 are available in space saving 6 pin SOT23 packages All devices are available in the extended 40 C to 85 temperature range Applications Data Communications Video Line Drivers Video Multiplexing XDSL Drivers Differential Line Drivers Pin Configurations ADC Input Buffers Video Cameras Video Switches Video Editors RF Receivers TOP VIEW Vcc SHDN MAXIM MAX4223 MAX4224 Pin Configurations continued at end of data sheet MAXIM SOT23 6 Features Ultra High Speed and Fast Settling Time 1GHz 3dB Bandwidth MAX4223 Gain 1 600MHz 3dB Bandwidth MAX4224 Gain 2 1700V us Slew Rate MAX4224 5ns Settling Time to 0 1 MAX4224 Excellent Video Specifications MAX4223 Gain Flatness of 0 1dB to 300MHz 0 01 0 02 DG DP Errors Low Distortion 60dBc THD fc 10MHz 42dBm Third Order Intercept f 30MHz 6 0mA Quiescent Supply Current per amplifier Shutdown Mode 350pA Supply Current per amplifier 100kO Output Impedance High Output Drive Capability 80mA Output Current Drives up to 4 Back Terminated 75Q Loads to 2 5V while Maintaining Excellent Differential Gain Phase Characteristics Available in Tiny 6 Pin SOT23 and 10 Packages 9 Ordering Information PIN SOT PART PACKAGE TOP MARK TEMP RANGE MAX4223EUT T 40 C to 85 C 6 SOT23 AAAD MAX4223ESA 40 C to 85 C 8 SO Or
23. hniques described above The smallest available surface mount resistors were used for the feedback and back termination resis tors to minimize the distance from the IC to these resis tors thus reducing the capacitance associated with longer lead lengths SMA connectors were used for best high frequency performance Because distances are extremely short performance is unaffected by the fact that inputs and outputs do not match a 50Q line However in applica tions that require lead lengths greater than 1 4 of the wavelength of the highest frequency of interest con stant impedance traces should be used Fully assembled evaluation boards are available for the MAX4223 in an SO 8 package MAXIM MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228 Figure 4 Using an Isolation Resistor Riso for High Capacitive Loads 13 8CCVUXVIN ECCVXVIN 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown AC Testing Performance AC specifications on high speed amplifiers are usually guaranteed without 100 production testing Since these high speed devices are sensitive to external par asitics introduced when automatic handling equipment is used it is impractical to guarantee AC parameters through volume production testing These parasitics are greatly reduced when using the recommended PC board layout like the Maxim evaluation kit Characterizing the part in this way more accurately rep
24. igh speed amplifiers pay careful attention to power supply bypassing and board layout The PC board should have at least two layers a signal and power layer on one side and a large low impedance ground plane on the other The ground plane should be as free of voids as possible with one exception the inverting input pin IN should have as low a capacitance to ground as possible This means that there should be no ground plane under IN or under the components RF and Ra connected to it With multilayer boards locate the ground plane on a layer that incorporates no signal or power traces Whether or not a constant impedance board is used it is best to observe the following guidelines when designing the board 1 Do not use wire wrapped boards they are too inductive or breadboards they are too capacitive 2 Do not use IC sockets IC sockets increase reac tance 3 Keep signal lines as short and straight as possible Do not make 90 turns round all corners 4 Observe high frequency bypassing techniques to maintain the amplifier s accuracy and stability 5 In general surface mount components have shorter bodies and lower parasitic reactance giving better high frequency performance than through hole com ponents The bypass capacitors should include a 10nF ceramic surface mount capacitor between each supply pin and the ground plane located as close to the package as possible Optionally place a 10uF tantalum capa
25. ime 20 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 1997 Maxim Integrated Products Printed USA MAXIM is a registered trademark of Maxim Integrated Products
26. inear system In addition to the input signal frequencies the resulting output signal contains new frequency components that represent the sum and difference products of the two input frequen cies If the two input signals are relatively close in fre quency the third order sum and difference products will fall close to the frequency of the desired output and will therefore be very difficult to filter The third order intercept IP3 is defined as the power level at which the amplitude of the largest third order product is equal to the power level of the desired output signal Higher third order intercept points correspond to better lineari ty of the amplifier The 4223 4228 have a typi cal IP3 value of 42dBm making them excellent choices for use in communications systems ADC Input Buffers Input buffer amplifiers can be a source of significant errors in high speed ADC applications The input buffer is usually required to rapidly charge and discharge the ADC s input which is often capacitive see the section Driving Capacitive Loads In addition a high speed ADC s input impedance often changes very rapidly during the conversion cycle requiring an amplifier with MAXIM 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown very low output impedance at high frequencies to main tain measurement accuracy The combination of high speed fast slew rate low noise and low distortion makes the MAX4223 MAX4228 id
27. iv MAX4223 M AX4225 M AX4226 LARGE SIGNAL PULSE RESPONSE AycL 1 CL 25pF 4223 27 Ar TIME 10ns div MAX4224 M AX4227 M AX4228 LARGE SIGNAL PULSE RESPONSE 5 MAX4223 30 TIME 10ns div GND GND GND GND GND GND 4223 4228 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Typical Operating Characteristics continued Vcc 5V VEE 5V RL 1000 Ta 25 C unless otherwise noted POWER SUPPLY CURRENT PER AMPLIFIER vs TEMPERATURE INPUT BIAS CURRENT vs TEMPERATURE 223 32 5 7 4 6 5 5 4 lg 3 2 lp 2 SHUTDOWN 1 a ee a 0 0 50 235 0 25 50 75 TEMPERATURE C TEMPERATURE C POSITIVE OUTPUT SWING vs TEMPERATURE 45 4 0 9 35 3 0 25 5 B 2 0 15 10 50 235 0 25 5 75 100 TEMPERATURE C 8 100 NEGATIVE CUTPUT SAING V SHORT CIRCUIT OUTPUT CURRENT vs TEMPERATURE 170 223 33 160 SINKING 150 CUFFENT mA 140 SOURCING 130 120 50 25 0 25 50 TEMPERATURE C 75 100 NEGATIVE OUTPUT SWING vs TEMPERATURE 223 35 TEMPERATURE C MAXIM 1GHz Low Power SOT23 Current Feedback Amplifiers with Shutdown Pin Description
28. with a sample characterization of units These minimum specifications are for design guidance only and are not intended to guarantee AC performance see AC Testing Performance For 100 testing of these parameters contact the factory Input Test Signal 3 58MHz sine wave of amplitude 40IRE superimposed on a linear ramp OIRE to 100IRE IRE is a unit of video signal amplitude developed by the International Radio Engineers 140IRE 1V Assumes printed circuit board layout similar to that of Maxim s evaluation kit Typical Operating Characteristics Vcc 5V 5V RL 1000 TA 25 C unless otherwise noted Note 5 Note 6 Note 7 MAX4223 SM ALL SIGNAL GAIN vs FREQUENCY MAX4223 SMALL SIGNAL GAIN vs FREQUENCY MAX4223 MAX4225 MAX4226 LARGE SIGNAL GAIN vs FREQUENCY 1 2 5 1 4 4 4 8 3 Vin 20 B Vin 20mVp p 5 Ay 1 SO 8 PACKAGE Rr 5600 2 Rr 5600 2 2 Vour 2Vp p 1 3 g 1 1 2 g 800 g 0 Z 4 B 2 4 8 SOT23 8 2 47 2 2 8 3 3 4 4 4 5 5 5 6 6 6 1 10 100 1000 1 0 100 1000 1 10 00 1000
29. y 6mA of supply current per amplifier The MAX4223 MAX4225 MAX4226 are optimized for closed loop gains of 1 OdB or more and have 3dB bandwidths of 1GHz The MAX4224 MAX4227 MAX4228 are optimized for closed loop gains of 2 6dB or more and have 3dB bandwidths of 600MHz 1 2GHz gain bandwidth product The current mode feedback topology of these ampli fiers allows them to achieve slew rates of up to 1700V us with corresponding large signal bandwidths up to 330MHz Each device in this family has an output that is capable of driving a minimum of 60mA of output current to 2 5V Theory of Operation Since the MAX4223 MAX4228 are current feedback amplifiers their open loop transfer function is expressed as a transimpedance AVouT or T Aliy The frequency behavior of this open loop transimped ance is similar to the open loop gain of a voltage feed back amplifier That is it has a large DC value and decreases at approximately 6dB per octave Analyzing the current feedback amplifier in a gain con figuration Figure 1 yields the following transfer func tion VOUT G Tz S MN Tz S G x Ry Re where G Ay 1 Ze G At low gains x RIN lt lt Therefore unlike tradi tional voltage feedback amplifiers the closed loop bandwidth is essentially independent of the closed loop gain Note also that at low frequencies Tz gt gt G x RIN RF so that VouT_ RG 10

MAXIM MAX4223 MAX4228 1GHz Low-Power SOT23 Current-Feedback Amplifiers with Shutdown handbook

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