Home

National LMV1031-20 handbook

1. characterization Note 6 The maximum power dissipation is a function of T Ax 9jA and Ta The maximum allowable power dissipation at any ambient temperature is Pp Ty MAx TA 0jA All numbers apply for packages soldered directly onto a PC board www national com 2 Connection Diagram 4 Bump Ultra Thin micro SMD A2 B2 OUTPUT Vec A1 B1 GND INPUT 20150803 Top View Note Pin numbers are referenced to package marking text orientation The actual physical placement of the package marking will vary slightly from part to part The package will designate the date code and will vary considerably Package marking does not correlate to device type in any way Ordering Information Package Part Number Package Marking Transport Media NSC Drawing 4 Bump Ultra Thin LMV1031UR 20 250 Units Tape and Reel Date Code URAO4JJA micro SMD lead free LMV1031URX 20 3k Units Tape and Reel 3 www national com 0c LEOLAWT LMV1031 20 Typical Performance Characteristics Unless otherwise specified Vs 2V single supply T 25 C Supply Current vs Supply Voltage SUPPLY CURRENT uA 60 15 20 25 30 35 40 45 50 55 SUPPLY VOLTAGE V 20150815 Gain vs Supply Voltage GAIN dB N O O 19 4 1 5 2 0 2 5 3 0 3 5 40 45 50 5 5 SUPPLY VOLTAGE V 20150824 Power Supply Rejection Ratio vs Frequency 120 100 H Mi CO eo PSRR dB O O A gll NUI ania IN ut It 1 Um LUE HUE COME HO 1
2. E Kin Hit it LL 10 100 1k 10k 100k FREQUENCY Hz 20150811 FIGURE 3 A Weighted Filter The A weighted filter is commonly used in signal to noise ratio measurements where sound is compared to device noise It improves the correlation of the measured data to the signal to noise ratio perceived by the human ear OUTPUT CURRENT The LMV1031 is designed for driving high ohmic loads with several milli amperes of output current Figure 4 shows the gain performance of the LMV1031 versus the sinking and sourcing current The gain remains constant within the shown output current range This sets the operating range of the LMV1031 with respect to the output current Application Section Continued NEGATIVE SOURCING CURRENT POSITIVE SINKING CURRENT GAIN dB OUTPUT VOLTAGE V 0 2 0 10 00 10 20 30 40 OUTPUT CURRENT mA 20150822 FIGURE 4 Performance vs Output Current MEASURING NOISE AND SNR The overall noise of the LMV1031 is measured within the frequency band from 10 Hz to 22 kHz using an A weighted filter The input of the LMV1031 is connected to ground with a 5 pF capacitor A WEIGHTED FILTER ID l H FIGURE 5 Noise Measurement Setup 20150812 The signal to noise ratio SNR is measured with a 1 kHz input signal of 18 MVpp using an A weighted filter This represents a sound pressure level of 94 dB with a standard ECM sensitivity No input capacitor is connected SOUND PRESSURE LEVEL The vol
3. M PKG SYMM 0 5 DIMENSIONS ARE IN MILLIMETERS 9 C3 DIMENSIONS IN FOR REFERENCE ONLY l L 169 5 LAND PATTERN RECOMMENDATION B X3 BUMP BUMP A1 CORNER sae SILICON AY 20 295 0 255 URA04XXX Rev D NOTE UNLESS OTHERWISE SPECIFIED 1 FOR SOLDER BUMP COMPOSITION SEE SOLDER INFORMATION IN THE PACKAGING SECTION OF THE NATIONAL SEMICONDUCTOR WEB PAGE www national com 2 RECOMMEND NON SOLDER MASK DEFINED LANDING PAD 3 PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION 4 XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH X2 IS PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT 5 NO JEDEC REGISTRATION AS OF NOVEMBER 2004 4 Bump Ultra Thin micro SMD with Large Dome Bump Technology NS Package Number URAO4JJA X1 1 179 mm X2 1 179 mm X3 0 35 mm National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications For the most current product information visit us at www national com LIFE SUPPORT POLICY NATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support device
4. Note 4 Note 5 Note 4 Units lbp Supply Current Vin GND 72 90 100 HA SNR Signal to Noise Ratio f 1 kHz Vin 18 MVpp o amp 2 dB THD Total Harmonic Distortion f 1 kHz Vin 18 MVpp 0108 o Output Noise A Weighted e BV Ay Gain f 1 kHz Vin 18 MVpp 19 18 20 1 20 90 3B 19 00 21 00 ON mmuCmadame 2 a Output Voltage Vin GND 890 1090 1310 m 875 1325 PSRR Power Supply Rejection Ratio 2V lt Vo lt 5V 56 dB Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is intended to be functional but specific performance is not guaranteed For guaranteed specifications and the test conditions see the Electrical Characteristics Note 2 The human body model HBM is 1 5 KQ in series with 100 pF The machine model is OO in series with 200 pF Note 3 Electrical table values apply only for factory testing conditions at the temperature indicated Factory testing conditions result in very limited self heating of the device such that Ty Ta No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self heating where Tj gt Ta O O1 NO NO Note 4 All limits are guaranteed by design or statistical analysis Note 5 Typical values represent the most likely parametric norm at the time of
5. O O LMV 1031 20 O National Semiconductor LMV1031 20 October 2005 Amplifier for Internal 3 Wire Analog Microphones and External Preamplifier General Description The LMV1031 audio amplifier is an ideal replacement for the JFET preamplifier that is currently used in the electret micro phones The LMV1031 is optimized for applications that require extended battery life such as Bluetooth communica tion links The supply current for the LMV1031 is only 72 pA This is a dramatic reduction from that required for a JFET equipped microphone The LMV10931 with its separate out put and supply pins offers a higher PSRR and eliminates the need for additional external components The LMV1031 is guaranteed to operate from 2V to 5V supply voltage over the full temperature range has a fixed voltage gain of 20 dB and enhanced SNR performance The LMV1031 is optimized for an output biasing of 1 09V The LMV1031 has less than 200 of output impedance over the full audio bandwidth The gain response of the LMV1031 is flat within the audio band and is stable over the tempera ture range The LMV1031 is available in a large dome 4 bump ultra thin micro SMD package that can easily fit on the PCB inside the miniature microphone metal can package This package is designed for microphone PCBs requiring 1 kg adhesion criteria Block Diagram OUT GND 20150801 2005 National Semiconductor Corporation DS201508 Features Typi
6. V1031 to be placed on the PCB inside the microphone The bottom side of the PCB has the pins that connect the supply voltage to the amplifier and make the output avail able The input of the amplifier is connected to the micro phone via the PCB DIAPHRAGM AIRGAP ELECTRET BACKPLATE CONNECTOR LMV1031 Voc VOUT GND 20150804 FIGURE 1 Built in Gain EXTERNAL PREAMPLIFIER APPLICATION The LMV1031 can also be used outside of an ECM as a space saving external preamplifier In this application the LMV1031 follows a phantom biased JFET microphone in the circuit This is shown in Figure 2 The input of the LMV1031 is connected to the microphone via a 2 2 uF capacitor The advantages of this circuit over one with only a JFET micro phone are the additional gain and the high pass filter sup plied by the LMV1031 The high pass filter makes the output signal more robust and less sensitive to low frequency dis turbances In this configuration the LMV1031 should be placed as close as possible to the microphone www national com JFET Microphone LMV1031 GND 20150802 FIGURE 2 LMV1031 as external preamplifier A WEIGHTED FILTER The human ear has a frequency range from 20 Hz to about 20 kHz Within this range the sensitivity of the human ear is not equal for each frequency To approach the hearing re sponse weighting filters are introduced One of those filters is the A weighted filter dBV i T
7. cal LMV1031 20 2V Supply Unless Otherwise Noted B Signal to noise ratio 62 dB Output voltage noise A weighted 86 dBV m Low supply current 72 UA m Supply voltage 2V to 5V m Input impedance 2100 MQ m Max input signal 108 mVpp B Output voltage 1 09V B Temperature range 40 C to 85 C m Large Dome 4 Bump micro SMD package with improved adhesion technology Applications m Mobile communications Bluetooth m Accessory microphone products m Cellular phones m PDAs Electret Microphone DIAPHRAGM AIRGAP ELECTRET BACKPLATE CONNECTOR LMV1031 Vcc L VOUT GND 20150804 www national com AJONdwesaig jeu191x3 pue sauoydosijy Hojeuy 311M E Jeujd91U 40J Siouiidumg OZ LEOLAINT LMV1031 20 Absolute Maximum Ratings Note 1 Storage Temperature Range 65 C to 150 C If Military Aerospace specified devices are required Junction Temperature Note 6 150 C max please contact the National Semiconductor Sales Office Mounting Temperature Distributors for availability and specifications Infrared or Convection 20 sec 235 C ESD Tolerance Note 2 enee 2500V Operating Ratings note 1 Machine Model 250V Supply Voltage Supply Voltage 2V to 2 Vop GND 5 5V Temperature Range 40 C to 85 C 2V and 5V Electrical Characteristics note 3 Unless otherwise specified all limits are guaranteed for T 25 C and Vpp 2V and 5V Boldface limits apply at the tempera ture extremes n Typ Max Mi Symbol
8. h as wind and vibration This also helps to reduce the proximity effect in directional microphones This effect occurs when the sound source is very close to the microphone The lower frequencies are amplified which gives a bass sound This amplification can cause an overload which results in a dis tortion of the signal www national com 0c LEOLAWT LMV1031 20 Application Section Continued GAIN dB www national com e 0 10 1k 10k LI FREQUENCY Hz FIGURE 7 Gain vs Frequency 20150821 The LMV1031 is optimized to be used in audio band appli cations As shown in Figure 7 the LMV1031 provides a flat gain response within the audio band and offers excellent temperature stability ADVANTAGE OF THREE PINS When implemented in an Electret Condenser Microphone ECM the LMV1031 adds the advantages of a three pin configuration The third pin provides a low supply current higher PSRR and eliminates the need for additional external components It is well known that cell phone microphones are sensitive to noise pick up A conventional JFET circuit is sensitive to noise pick up because of its high output impedance which is usually around 2 2 kQ The LMV1031 is less sensitive to noise pick up because it provides separate output and sup ply pins Using separate pins greatly reduces the output impedance Physical DIMENSIONS inches millimeters unless otherwise noted PKG SYMM 0 215 i 4X 9 550 iex ER
9. k 10 100 10k 100k FREQUENCY Hz JI e N O 20150817 www national com Output Voltage vs Supply Voltage 1160 1140 N O 1100 1080 1060 OUTPUT VOLTAGE V 1040 HHH 1 5 2 0 25 30 35 40 45 50 5 5 SUPPLY VOLTAGE V 20150823 1000 Closed Loop Gain and Phase vs Frequency 25 20 100 TL 15 JD 0 e LLI A 10 N 400 h Jil A R 0 300 10 100 10k 100k 1M FREQUENCY Hz 20150816 Total Harmonic Distortion vs Frequency 0 7 U TO Die DCH UCI DE 0 5 z 04 SBS I AI TI Oil 0 0 10 100 1k 10k 100k FREQUENCY Hz 20150818 Typical Performance Characteristics unless otherwise specified Vs 2V single supply Ta 25 C Continued Total Harmonic Distortion vs Input Voltage Output Voltage Noise vs Frequency 110 d I Z S 120 V ea A LLI T ai LE MU i l Wi Il z 8 l ill M ll 150 0 25 50 75 100 125 150 10 100 10k 100k INPUT VOLTAGE mVpp FREQUENCY Hz 20150819 20150820 5 www national com 0c L 0LAIN I LMV1031 20 Application Section LOW CURRENT The LMV1031 has a low supply current which allows for a longer battery life The low supply current of 72 uA makes this amplifier optimal for microphone applications which need to be always on BUILT IN GAIN The LMV1031 is offered in the space saving small micro SMD package which fits perfectly into the metal can of a microphone This allows the LM
10. rpy Hojeuy oJiAM Jeu 40J Siouiidumg OZ LEOLAINT Jeu dureaagd eu491x3 pue seuoudoijorpy 6ojeuy M E eu493u JO SJejirduyv OZ LEOLAINT Tel 81 3 5639 7560 www national com
11. s or systems are devices or systems 2 A critical component is any component of a life support which a are intended for surgical implant into the body or device or system whose failure to perform can be reasonably b support or sustain life and whose failure to perform when expected to cause the failure of the life support device or properly used in accordance with instructions for use system or to affect its safety or effectiveness provided in the labeling can be reasonably expected to result in a significant injury to the user BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification CSP 9 111C2 and the Banned Substances and Materials of Interest Specification CSP 9 111S2 and contain no Banned Substances as defined in CSP 9 111S2 Leadfree products are RoHS compliant National Semiconductor National Semiconductor National Semiconductor National Semiconductor Americas Customer Europe Customer Support Center Asia Pacific Customer Japan Customer Support Center Support Center Fax 49 0 180 530 85 86 Support Center Fax 81 3 5639 7507 Email new feedback nsc com Email europe support 9 nsc com Email ap support 9 nsc com Email jpn feedback 9 nsc com Tel 1 800 272 9959 Deutsch Tel 49 0 69 9508 6208 English Tel 44 0 870 24 O 2171 Frangais Tel 33 0 1 41 91 8790 AJONNdwesaig jeu191x3 pue seuoudoao
12. ume of sound applied to a microphone is commonly stated as the pressure level with respect to the threshold of hearing of the human ear This sound pressure level SPL in decibels is defined by Sound pressure level dB 20 log Be Where Pm is the measured sound pressure Po is the threshold of hearing 20 pPa In order to be able to calculate the resulting output voltage of the microphone for a given SPL the sound pressure in dB SPL needs to be converted to the absolute sound pressure in dBPa This is the sound pressure level in decibels which is referred to 1 Pascal Pa The conversion is given by dBPa dB SPL 20 log 20 Pa dBPa dB SPL 94 dB Translation from absolute sound pressure level to a voltage is specified by the sensitivity of the microphone A conven tional microphone has a sensitivity of 44 dBV Pa ABSOLUTE SOUND PRESSURE dBPa SENSITIVITY dBV Pa SOUND PRESSURE dB SPL VOLTAGE dBV 20150813 FIGURE 6 dB SPL to dBV Conversion Example Busy traffic is 70 dB Vout 70 94 44 68 dBV This is equivalent to 1 13 mMVpp Since the LMV1031 20 has a gain of 10 times 20 dB over the JFET the output voltage of the microphone is 11 3 MVpp By replacing the JFET with the LMV1031 20 the sensitivity of the microphone is 24 dBV Pa 44 20 LOW FREQUENCY CUT OFF FILTER The LMV1031 has a low cut off filter on the output of the microphone to reduce low frequency noises suc

National LMV1031-20 handbook

Contents

Download Pdf Manuals

Related Search

Related Contents