MAXIM MAX5018 Manual
Contents
1. ECL Termination lt b Voo AGND See Figure 3 for detail on Ref Buffer around one of the current sinks for better accuracy See Figure 3 Since the analog output currents are proportional to the digital input data and Iset full scale output can be adjusted by varying the reference current ISet is con trolled through the MAX5018 s Ref input Figure 1 shows the method and the necessary equations for set ting ISet The MAX5018 uses an external negative voltage reference The external reference must be stable to achieve a satisfactory output and Ref should be driven through a resistor to minimize offsets caused by bias current To change the full scale output vary the value for ISet with the 500Q trimmer A double 50Q load 25Q can be driven if ISet is increased by 50 for doubly terminated 75Q video applications MAXIM 8 Bit High Speed DAC Ref In O Iset Oo y y Reference Segment Switch 8TOSXVIN Data and Controls Figure 2 Equivalent Input Circuits Data Clock Controls and Reference Compensation The MAX5018 provides an external compensation input COMP for the reference buffer amplifier To use this pin correctly connect a capacitor between COMP and VEE as shown in Figure 1 Keep lead lengths as short as possible Use a large capacitor 0 01uF if the refer ence is to be kept as a constant The capacitor s value determines the am2. D 0 348 0 390 8 84 9 91 8 AB Mloo 038 D l0 735 0 765 18 67 19 43 14 AC Ae o 125 0 175 13 18 4 45 D 0 745 0 765 18 92 19 43 16 AA A3 0 055 0 080 1 40 2 03 D 0 88510 915 22 48 23 24 18 IAD Bloor 00221041 056 Dors 1 045 25 78 26 54 20 AE Bi 0 045 0 0651114 1165 mhis 1265 28 96 32 13 24 AF C 0 008 0 012 0 20 0 30 D L360 1 380 34 54 35 05 28 x 5 D1 0 005 0 080 013 2 03 E 0 300 0 325 7 62 T826 OTES F 1 0 240 10 310 6 10 17 87 Se oath Pees NE e 0 100 Greats 2 54 ee O EXCEED 15mm 6 006 aao zee GaN a one eB 0 400 10 16 N ABOVE TABLE L 0115 0150 292 3 81 cae ieee ht eae aa AVAX AVA PACKAGE FAMILY OUTLINE PDIP 300 14 21 0043 A Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time 12 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
3. 2 MAXIM 8 Bit High Speed DAC DC ELECTRICAL CHARACTERISTICS continued Vcc ground VEE 5 2V 0 3V Cc OpF Iset 1 105mA Ta TMIN to Tmax unless otherwise noted PARAMETER SYMBOL CONDITIONS M MIN TYP MAX UNITS Input Capacitance Data and Controls CIN V 3 pF Power Supply Sensitivity VI 120 20 120 A V Supply Current IEE VI 155 220 mA AC ELECTRICAL CHARACTERISTICS RL 37 59 CL 5pF Iset 1 105mA Ta 25 C unless otherwise noted PARAMETER SYMBOL CONDITIONS ald MIN TYP MAX UNITS MAX5018B III 165 Maximum Conversion Rate MAX5018A il 275 Msps IIl 1 6 Rise Time a 10 to 90 G S Ta TMIN to TMAX iV 50 R 10 to 90 G S RL 25Q V 1 0 g SaN To 0 2 G S V 7 0 urrent Settling Time o Clocked Mode tsi To 0 8 G S V 5 5 ns To 0 2 G S RL 25Q V 4 5 Clock to Output Delay g HHI 2 2 4 0 Clocked Mode tosc Ta Tmin to Tmax iV 45 ns Data to Output Delay 7 III 3 2 6 0 Transparent Mode DsT Ta Tmin to TMAX IV 6 0 S Convert Pulse Width tPWL B Grade HII 3 0 a2 low or high tPWH A Grade HII 1 8 Glitch Energy Area 1 2VT V 4 pV s Reference Bandwidth 3dB V 1 0 MHz Setup Time Data and t Ta 25 C HI 1 0 ae Controls Ta Tmn to TMAX IV 1 0 Hold Time Data and t Ta 25 C Ill 0 5 ee Controls a Ta Tmin to TMAX IV 0 5 20 to 80 G S Ta 25 C IIl 390 lew Ri V Sl
4. the appropriate analog output When FT is tied high the control inputs and data are not registered The analog output asyn chronously tracks the input data and video controls Feedthrough itself is asynchronous and is usually used as a DC control To be registered synchronously control and data inputs must be present at the input pins for a specific setup time ts before and a specific hold time tH after CONV s rising edge Setup and hold times are not impor tant in asynchronous mode The minimum pulse widths high tPWH and low tPWL as well as settling time become the limiting factors Figure 4 The video controls produce the output levels needed for horizontal blanking frame synchronization etc to be compatible with video system standards as described in RS 343 A Table 2 shows the video control effects on the analog output Internal logic gov erns blank sync and force high so that they override the data inputs as needed in video applications Sync overrides both the data and other controls to produce full negative video output Figure 5 Reference white video level output is provided by force high which drives the internal digital data to full scale output 100IRE units Bright gives an additional 10 of full scale value to the output level This function can be used in graphic displays for highlighting menus cursors or warning messages If the devices are used in non video applications the video controls can b
5. DABS RAB Mee ARAM MRE 19 1204 Rev 0 3 97 General Description The MAX5018 is a monolithic 8 bit digital to analog converter DAC capable of accepting video data at 165Msps or 275Msps Complete with video controls sync blank reference white force high and bright the MAX5018 directly drives doubly terminated 50Q or 75Q loads to standard composite video levels Standard setup level is 7 5IRE The MAX5018 is pin compatible with the HDAC10180 and the TDC1018 with improved performance The MAX5018 contains data and control input registers video control logic ref erence buffer and current switches Two performance grades of the MAX5018 are available Both are packaged in a 24 pin PDIP in the 20 C to 85 C industrial temperature range Applications High Resolution Color or Monochrome Raster Graphics Displays to 1500 x 1800 Pixels Medical Electronics CAT PET and MRI Displays CAD CAE Workstations Solids Modeling General Purpose High Speed Digital to Analog Conversion Digital Synthesizers Automated Test Equipment Digital Transmitters Modulators Pin Configuration TOP VIEW MAXIM MAX5018 MAXIM M AALS 8 Bit High Speed DAC Features 275Msps Conversion Rate MAX5018A 165Msps Conversion Rate MAX5018B TDC1018 and HDAC10180 Compatible with Improved Performance RS 343 A Compatible Complete Video Controls Sync Blank Bright and Reference
6. White force high ECL Compatible Single Power Supply Registered Data and Video Controls Differential Current Outputs gt gt gt gt ESD Protected Data and Control Inputs Ordering Information PART TEMP RANGE PIN PACKAGE MAX5018AIPG 20 C to 85 C 24 Plastic DIP MAX5018BIPG 20 C to 85 C 24 Plastic DIP Functional Diagram Sync Blank Bright Ref High DO D3 Output Register Current Switches Video Data in D4 07 MSBs Feedthrough MAXIM Convert z MAX5018 Maxim Integrated Products 1 For the latest literature http www maxim ic com or phone 1 800 998 8800 8TOSXVIN MAX5018 8 Bit High Speed DAC ABSOLUTE MAXIMUM RATINGS Supply Voltage VEE Measured to VOC cceeeeeeeeeeeeeeeeeeeeeteeeeeeeeeee 7 0V to 0 5V Input Voltages CONV Data and Controls measured to Vcc VEE to 0 5V Ref measured tO VCC c cccccceessceeeeeseeeeeeeeeenteeeees Vee to 0 5V Ref measured tO VCC ceseseeesteeeeteeeeeneeeeseeeeaes Vee to 0 5V Operating Temperature Ranges Ambienta ne wee iin ae JUNCON A e einen E ER Lead Temperature soldering 10sec Storage Temperature Range ccceeeeeeee Stresses beyond those listed 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 t
7. d be bypassed as close to the device as possible with 0 01uF and 10uF capacitors 8TOSXVIN MAX5018 8 Bit High Speed DAC Video Monitor Video Control Inputs yyYyvVyyY Output Current vy vy Register Video Data inputs Switches 1 V 1 2 V typical for LM113 2 V 1 2V a coo Sel oT Ry R2 Vou K 28 Digtal input code i Ser IRL K x Set x RL Bright 3 4 RL R3 R4 5 6 Veyne K x lse X RL Kp x Ise x RL K 15 8069 Ky 1 7617 Kp 10 0392 All reference resistors 1 8 W 1 metal film power supply decoupling 50 V ceramic disc Figure 1 Typical Interface Circuit This device also has two analog ground pins Vcc Tie both ground pins to the analog ground plane All power and ground pins must be connected in any application If a 5V power source is required the Vcc ground pins become the positive supply pins while the VEE supply pins become the ground pins The relative polarities of the other input and output voltages must be main tained Reference Considerations The MAX5018 has two reference inputs Ref and Ref The input pins are connected to the inverting and non inverting inputs of an internal amplifier that serves as a reference buffer amplifier The buffer amplifiers output is the reference for the cur rent sinks The amplifier feedback loop is connected
8. e left open Convert Clock For best performance the clock should be differentially ECL driven by using CONV and CONV Figure 6 Driving the clock in this manner minimizes clock noise and power supply output intermodulation The clock s rising edge synchronizes the data and control inputs to the MAX5018 Since CONV determines the actual switching threshold of CONV the clock can be driven single ended by connecting a bias voltage to CONV This bias voltage sets the converter clock s switching threshold Analog Outputs The MAX5018 has two analog outputs that are high impedance complementary current sinks The outputs vary in proportion to the input data controls and refer ence current values so that the full scale output can be changed by setting ISet In video applications the outputs can drive a doubly terminated 50Q or 75Q load to standard video levels In the standard configuration shown in Figure 7 the out put voltage is the product of the output current and load impedance and is between OV and 1 07V Out Figure 5 provides a video output waveform with the Sync pulse bottom at 1 07V Out is inverted with Sync up MAXIM 8 Bit High Speed DAC _ Data Control Inputs tost 1 2 LSB 1 2 LSB Figure 4 Timing Diagram 256 Gray Levels Normal Low Black 1071 mV Figure 5 Video Output Waveform for Standard Load MAAIAA o S 9 8TOSXVIN 8 B
9. hose 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 ground VEE 5 2V 0 3V Cc OpF Iset 1 105mA Ta TMIN to Tmax unless otherwise noted PARAMETER SYMBOL CONDITIONS oes MIN TYP MAX UNITS 0 37 0 37 Full Scale I Li ity E ILE 1 0mA lt 1 3mA VI ntegral Linearity Error OmA lt IsET lt 1 3m 0 95 0 95 LSB 0 2 0 2 Full Scale Diff jal Li ity E DLE 1 0mA lt 1 3mA VI ifferential Linearity Error OmA lt ISET lt 1 3m 05 05 LSB Gain Error VI 6 5 6 5 Full Scale Gain Error Tempco V 150 ppm C Input Capacitance Ref Ref CREF y 3 Pr Compliance Voltage Positive Output yi te 18 y Compliance Voltage Negative Output N ae t3 y Equivalent Output Resistance RouT M at Ko Output Capacitance CouT V 12 pF Maximum Current Positive Output 1O MAX W 1 mA Maximum Current Negative Output lO MaX N te mp Output Offset Current los VI 0 05 0 5 LSB Input Voltage Logic High VIH VI 1 0 V Input Voltage Logic Low VIL VI 1 5 V Convert Voltage Common Mode Range v eas ins X Convert Voltage Differential K 0 4 i y Input Current Logic Low Data and Controls liL v 35 120 HA Input Current Logic High Data and Controls MH yI ae 120 A Input Current Convert ICONV Vi 2 60 yA
10. iques be used for all ECL interfaces A convenient and common ly used microstrip impedance is about 130Q which is easily terminated using a 3300 resistor to VEE and a 2200 resistor to ground This arrangement gives a Thevenin equivalent termination of 130Q to 2V without the need for a 2V supply Standard single in line pack age SIP 220 330 resistor networks are available for this purpose Figure 2 shows equivalent input circuits Output Considerations The analog outputs are designed to directly drive a dual 50Q or 75Q load transmission system as shown in Figure 1 The MAX5018 output source impedances are high impedance current sinks The load impedance RL must be 25Q or 37 50 to attain standard RS 343 A video levels Any deviation from this impedance affects the resulting video output levels proportionally As with the data interface it is important that all analog trans mission lines have matched impedance throughout including connectors and transitions between printed wiring and coaxial cable The combination of matched source termination resistor Rs and load terminator RL minimizes reflections of both forward and reverse trav eling waves in the analog transmission system Power Considerations The MAX5018 has two analog power supply pins and operates from a standard 5 2V single supply Proper supply bypassing augments the MAX5018 s inherent supply noise rejection characteristics As shown in Figure 1 each supply pin shoul
11. it High Speed DAC Table 2 Video Control Operation output values for setup 10IRE 75Q standard load z REF DATA P SYNC BLANK WHITE BRIGHT INPUT OUT mA OUT V OUT IRE DESCRIPTION x lt 1 X X X X 28 57 1 071 40 Sync Level q 0 1 X X X 20 83 0 781 0 Blank Level 1 1 X 0 00 0 000 110 Enhanced High Level 1 0 X 1 95 0 073 100 Normal High Level 000 19 40 0 728 7 5 Normal Low Level 111 1 95 0 073 100 Normal High Level 1 000 17 44 0 654 17 5 Enhanced Low Level 1 Tif 0 00 0 000 110 Enhanced High Level 0 0 V Vicm MIN Figure 6 CONV CONV Switching Levels VO MAX 8 Bit High Speed DAC Video Monitor MAXIM MAX5018 o Inverse Video Video Out 0 to 1 Volt Figure 7 Standard Load a and Test Load b MAAIA o 7 OA 8TOSXVIN MAX5018 8 Bit High Speed DAC Package Information Dl j N m E D j a F 1 rr j M A A lt aw j i HSA as i o l Hi o Wi 1 i R i e ke B1 CH eA eB INCHES ILLIME TERS INCHES MILLIMETERS MIN MAX MIN MAX MIN MAX MIN MAX N sui A _ 0 200 5 08
12. lank Input 12 BRT Video Bright Input 13 Sync Video Sync Input 14 Ref Reference Current Negative Input 15 Ref Reference Current Positive Input 16 COMP Compensation Input 18 Out Output Current Negative 19 Out Output Current Positive 21 D7 Data Bit 7 MSB 22 23 24 D6 D5 D4 Data Bits 6 5 and 4 MAXIM Detailed Description The MAX5018 is an ultra high speed video digital to analog converter DAC capable of up to 275Msps con version rates This high speed makes the device suitable for driving 1500 x 1800 pixel displays at 70Hz to 90Hz update rates The MAX5018 is separated into different conversion rate categories as shown in Table 1 The MAX5018 has ECL logic level compatible video controls and data inputs The complementary analog output currents produced by the devices are propor tional to the product of the digital control and data inputs in conjunction with the analog reference current The MAX5018 is segmented so that the input data s four MSBs are separated into a parallel thermometer code From here fifteen identical current sinks are driv en to fabricate sixteen coarse output levels The remaining four LSBs drive four binary weighted current switches MSB currents are then summed with the LSBs that con tribute one sixteenth of full scale to provide the 256 dis tinct analog output levels The video control inputs drive weighted current sinks which are added to the output current to produce com p
13. osite video output levels These controls sync blank reference white force high and bright are required in video applications A feature that similar video DACs do not have is feed through control The feedthrough pin FT allows regis tered or unregistered operation of the video control and data inputs In registered mode the composite func tions are latched to the pixel data to prevent screen edge distortions generally found on unregistered video DACs Table 1 The MAX5018 Family and Speed Designations PART UPDATE COMMENTS Suitable for 1200 x 1500 to 1500 x 1800 displays at 60Hz to 90Hz update rate Suitable for 1024 x 1280 to 1200 x 1500 displays at 60Hz to 90Hz update rate MAX5018A 275Msps MAXS5018B 165Msps MAA 8 Bit High Speed DAC Applications Information General Figure 1 shows a typical application using the MAX5018 in a color raster circuit The MAX5018 requires few exter nal components and is extremely easy to use The MAX5018 s very high operating speeds require good cir cuit layout supply decoupling and proper transmission line design For best performance note the following considerations Input Considerations Video input data and controls can be directly con nected to the MAX5018 Note that all ECL inputs are terminated as closely to the device as possible to reduce ringing crosstalk and reflections Maxim rec ommends that stripline or microstrip techn
14. ow Rate Ta TMIN to TMAX IV 325 pS ill 4 Clock Feedthrough Ta Tmin to TMAX dB IV 48 MAKLSVI 3 8TOSXVIN MAX5018 8 Bit High Speed DAC TEST LEVEL CODES All electrical characteristics are subject to the following conditions All parameters having min max specifica tions are guaranteed The Test Level column indicates the specific device testing actually performed during production and Quality Assurance inspection Any blank section in the data column indicates that the specifica tion is not tested at the specified condition Unless otherwise noted all tests are pulsed tests therefore Tj Tc Ta TEST LEVEL TEST PROCEDURE 100 production tested at the specified temperature Il 100 production tested at Ta 25 C and sample tested at the specified temperatures ll QA sample tested at only the specified temperatures IV Parameter is guaranteed but not tested by design and characterization data V Parameter is a typical value for reference only VI 100 production tested at Ta 25 C Parameter is guaranteed over specified temperature range Pin Description PIN NAME FUNCTION 1 2 3 D8 D2 D1 Data Bits 3 2 and 1 4 Do Data Bit 0 LSB 5 20 VEE Negative Supply 6 CONV Convert Clock Input 7 CONV Convert Clock Input Complement 8 FT Register Feedthrough Control 9 17 Voc Positive Supply 10 FH Data Force High Control 11 Blank Video B
15. plifier s bandwidth If reference mod ulation is required smaller capacitance values can be used to achieve up to a 1MHz bandwidth Data Inputs and Video Controls The MAX5018 has standard single ended data inputs The inputs are registered to produce the lowest differ ential data propagation delay skew to minimize glitch ing Also four video control inputs generate composite MAA video outputs sync blank bright and reference white force high Feedthrough control is also provided All of the controls and data inputs are ECL compatible In addition all have internal pulldown resistors to leave them at a logic low so the pins are inactive when not used This feature is useful if the devices are applied as standard DACs without the need for video controls or if fewer than eight bits are used The MAX5018 is usually configured in synchronous mode In this mode the controls and data are synchro nized to prevent pixel dropout This reduces screen edge distortions and provides the lowest output noise while maintaining the highest conversion rate With the FT control open low each rising edge of the convert clock CONV latches decoded data and control values into a D type internal register The switched current MAX5018 8 Bit High Speed DAC Current Current Reference Current Reference Amplifier Figure 3 Reference Buffer and DAC Output Circuit sinks convert the registered data into
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MAXIM MAX5018 Manual