OPA337 OPA2337 OPA338 OPA2338 ® OPA 337 OPA 233 7 OPA 233 8 For most current data sheet and other product information, visit www.burr-brown.com MicroSIZE, Single-Supply CMOS OPERATIONAL AMPLIFIERS MicroAmplifier ™ Series FEATURES DESCRIPTION ● MicroSIZE PACKAGES: SOT-23-5 SOT-23-8 ● SINGLE-SUPPLY OPERATION ● RAIL-TO-RAIL OUTPUT SWING ● FET-INPUT: IB = 10pA max ● HIGH SPEED: OPA337: 3MHz, 1.2V/µs (G = 1) OPA338: 12.5MHz, 4.6V/µs (G = 5) ● OPERATION FROM 2.5V to 5.5V ● HIGH OPEN-LOOP GAIN: 120dB ● LOW QUIESCENT CURRENT: 525µA/amp ● SINGLE AND DUAL VERSIONS The OPA337 series and OPA338 series rail-to-rail output CMOS operational amplifiers are designed for low cost and miniature applications. Packaged in the new SOT-23-8, the OPA2337EA and OPA2338EA are Burr-Brown’s smallest dual op amps. At only 1/4 the size of a conventional SO-8 surface mount, they are ideal for space-sensitive applications. Performance is not sacrificed for size. Utilizing advanced CMOS technology, OPA337 and OPA338 op amps provide low bias current, high-speed operation, high openloop gain, and rail-to-rail output swing. They operate on a single supply with operation as low as 2.5V while drawing only 525µA quiescent current. In addition, the input common-mode voltage range includes ground—ideal for singlesupply operations. The OPA337 series is unity-gain stable. The OPA338 series is optimized for gains greater than or equal to five. They are easy to use and free from phase inversion and overload problems found in some other op amps. Excellent performance is maintained as the amplifiers swing to their specified limits. The dual versions feature completely independent circuitry for lowest crosstalk and freedom from interaction, even when overdriven or overloaded. The OPA337 packages are the tiny SOT-23-5 surface mount, SO-8 surface mount, and 8-pin DIP packages. In addition to the miniature SOT-23-8 surface-mount package, the OPA2337 is available in SO-8 surfacemount and 8-pin DIP packages. The OPA338 packages are the SOT-23-5 and SO-8 surface mounts. The OPA2338 packages are the SOT-23-8 and SO-8 surface mounts. APPLICATIONS ● ● ● ● ● ● ● BATTERY-POWERED INSTRUMENTS PHOTODIODE PRE-AMPS MEDICAL INSTRUMENTS TEST EQUIPMENT AUDIO SYSTEMS DRIVING ADCs CONSUMER PRODUCTS SPICE Model available at www.burr.com OPA337, OPA338 OPA337, OPA338 NC 1 8 NC –In 2 7 V+ +In 3 6 Output V– 4 5 NC Out 1 OPA2337, OPA2338 5 V+ V– 2 –In A +In 3 4 –In SOT-23-5 8-Pin DIP(1), SO-8 Out A NOTE: (1) DIP versions for OPA337, OPA2337 only. 1 2 +In A 3 V– 4 A B 8 V+ 7 Out B 6 –In B 5 +In B 8-Pin DIP(1), SO-8, SOT-23-8 International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 © 1997 Burr-Brown Corporation PDS-1410C PDS-1410C Printed in U.S.A. February, 1999 SPECIFICATIONS: VS = 2.7V to 5.5V At TA = +25°C, and RL = 25kΩ connected to VS/2, unless otherwise noted. Boldface limits apply over the specified temperature range, –40°C to +85°C, VS = 5V. OPA337NA, UA, PA OPA2337EA, UA, PA OPA338NA, UA OPA2338EA, UA PARAMETER CONDITION OFFSET VOLTAGE Input Offset Voltage TA = –40°C to +85°C vs Temperature vs Power Supply Rejection Ratio TA = –40°C to +85°C Channel Separation (dual versions) dVOS/dT PSRR NOISE Input Voltage Noise, f = 0.1Hz to 10Hz Input Voltage Noise Density, f = 1kHz Current Noise Density, f = 1kHz ±2 25 VS = 2.7V to 5.5V VS = 2.7V to 5.5V dc IOS ±0.2 See Typical Curve ±0.2 en in 6 26 0.6 IB VCM CMRR TA = –40°C to +85°C –0.2V < VCM < (V+) – 1.2V –0.2V < VCM < (V+) – 1.2V AOL TA = –40°C to +85°C RL = 25kΩ, 125mV < VO < (V+) – 125mV RL = 25kΩ, 125mV < VO < (V+) – 125mV RL = 5kΩ, 500mV < VO < (V+) – 500mV RL = 5kΩ, 500mV < VO < (V+) – 500mV MAX UNITS ±3 mV mV µV/°C µV/V µV/V µV/V ±3.5 125 125 0.3 –0.2 74 74 INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain TA = –40°C to +85°C TYP(1) ±0.5 VOS INPUT BIAS CURRENT Input Bias Current TA = –40°C to +85°C Input Offset Current INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection Ratio TA = –40°C to +85°C MIN 100 100 100 100 ±10 pA ±10 pA µVp-p nV/√Hz fA/√Hz 90 (V+) – 1.2 V dB dB 1013 || 2 1013 || 4 Ω || pF Ω || pF 120 dB dB dB dB 114 OPA337 FREQUENCY RESPONSE Gain-Bandwidth Product GBW Slew Rate SR Settling Time: 0.1% 0.01% Overload Recovery Time Total Harmonic Distortion + Noise THD+N VS = 5V, G = 1 VS = 5V, G = 1 VS = 5V, 2V Step, CL = 100pF, G = 1 VS = 5V, 2V Step, CL = 100pF, G = 1 VIN • G = VS VS = 5V, VO = 3Vp-p, G = 1, f = 1kHz 3 1.2 2 2.5 2 0.001 MHz V/µs µs µs µs % OPA338 FREQUENCY RESPONSE Gain-Bandwidth Product GBW Slew Rate SR Settling Time: 0.1% 0.01% Overload Recovery Time Total Harmonic Distortion + Noise THD+N VS = 5V, G = 5 VS = 5V, G = 5 VS = 5V, 2V Step, CL = 100pF, G = 5 VS = 5V, 2V Step, CL = 100pF, G = 5 VIN • G = VS VS = 5V, VO = 3Vp-p, G = 5, f = 1kHz 12.5 4.6 1.4 1.9 0.5 0.0035 MHz V/µs µs µs µs % RL = 25kΩ, AOL ≥ 100dB RL = 25kΩ, AOL ≥ 100dB RL = 5kΩ, AOL ≥ 100dB RL = 5kΩ, AOL ≥ 100dB 40 OUTPUT Voltage Output Swing from Rail(2) TA = –40°C to +85°C TA = –40°C to +85°C Short-Circuit Current Capacitive Load Drive POWER SUPPLY Specified Voltage Range Minimum Operating Voltage Quiescent Current (per amplifier) TA = –40°C to +85°C 150 IQ TA = –40°C to +85°C 2.7 2.5 0.525 IO = 0 IO = 0 mV mV mV mV mA 5.5 V V mA mA ±9 See Typical Curve ISC CLOAD VS 125 125 500 500 1 1.2 The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® OPA337, OPA2337 OPA338, OPA2338 2 SPECIFICATIONS: VS = 2.7V to 5.5V (CONT) At TA = +25°C, and RL = 25kΩ connected to VS/2, unless otherwise noted. Boldface limits apply over the specified temperature range, –40°C to +85°C, VS = 5V. OPA337NA, UA, PA OPA2337EA, UA, PA OPA338NA, UA OPA2338EA, UA PARAMETER CONDITION TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance SOT-25-5 Surface Mount SOT-23-8 Surface Mount SO-8 Surface Mount 8-Pin DIP MIN TYP –40 –55 –55 MAX UNITS +85 +125 +125 °C °C °C θJA °C/W °C/W °C/W °C/W 200 200 150 100 NOTES: (1) VS = 5V. (2) Output voltage swings are measured between the output and negative and positive power supply rails. ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage ................................................................................... 5.5V Input Voltage(2) .................................................. (V–) –0.5V to (V+) +0.5V Input Current(2) ................................................................................. 10mA Output Short Circuit(3) .............................................................. Continuous Operating Temperature .................................................. –55°C to +125°C Storage Temperature ..................................................... –55°C to +125°C Junction Temperature ...................................................................... 150°C Lead Temperature (soldering, 10s) ................................................. 300°C This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. NOTES: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade device reliability. (2) Input signal voltage is limited by internal diodes connected to power supplies. See text. (3) Short circuit to ground, one amplifier per package. PACKAGE/ORDERING INFORMATION DESCRIPTION PACKAGE PACKAGE DRAWING NUMBER(1) OPA337 Series OPA337NA Single, G = 1 Stable 5-Lead SOT-23-5 331 –40°C to +85°C C37 " " " " " " Single, G = 1 Stable Single, G = 1 Stable 8-Pin DIP SO-8 Surface Mount 006 182 –40°C to +85°C –40°C to +85°C OPA337PA OPA337UA PRODUCT OPA337PA OPA337UA " SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(2) TRANSPORT MEDIA OPA337NA/250 OPA337NA/3K OPA337PA OPA337UA OPA337UA/2K5 Tape and Reel Tape and Reel Rails Rails Tape and Reel OPA2337EA/250 OPA2337EA/3K OPA2337PA OPA2337UA OPA2337UA/2K5 Tape and Reel Tape and Reel Rails Rails Tape and Reel OPA338NA/250 OPA338NA/3K OPA338UA OPA338UA/2K5 Tape and Reel Tape and Reel Rails Tape and Reel OPA2338EA/250 OPA2338EA/3K OPA2338UA OPA2338UA/2K5 Tape and Reel Tape and Reel Rails Tape and Reel " " " " " Dual, G = 1 Stable 8-Lead SOT-23-8 348 –40°C to +85°C A7 " " " " " Dual, G = 1 Stable Dual, G = 1 Stable 8-Pin DIP SO-8 Surface Mount 006 182 –40°C to +85°C –40°C to +85°C OPA2337PA OPA2337UA " " " " " " OPA338 Series OPA338NA Single, G ≥ 5 Stable 5-Lead SOT-23-5 331 –40°C to +85°C A38 " " " " " " 182 –40°C to +85°C OPA338UA " " " " " Dual, G ≥ 5 Stable 8-Lead SOT-23-8 348 –40°C to +85°C A8 " Dual, G ≥ 5 Stable " " " " SO-8 Surface Mount 182 –40°C to +85°C OPA2338UA " " " " " OPA2337EA " OPA2337PA OPA2337UA OPA338UA " OPA2338EA " OPA2338UA " Single, G ≥ 5 Stable SO-8 Surface Mount NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “OPA2337UA/2K5” will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book. 3 OPA337, OPA2337 OPA338, OPA2338 ® TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = +5V, and RL = 25kΩ connected to VS/2, unless otherwise noted. POWER SUPPLY REJECTION RATIO AND COMMON-MODE REJECTION RATIO vs FREQUENCY OPEN-LOOP GAIN/PHASE vs FREQUENCY 0 160 –45 φ –90 80 60 G 80 –135 40 PSRR, CMRR (dB) 120 100 +PSRR 90 Phase (°) Open-Loop Gain (dB) 100 OPA337 OPA338 140 –PSRR 70 60 50 CMRR 40 30 20 –180 0 20 10 –20 1 10 100 1k 10k 100k 1M 10M 1 10 100 1k Frequency (Hz) INPUT VOLTAGE AND CURRENT NOISE SPECTRAL DENSITY vs FREQUENCY 100k 1M 10M CHANNEL SEPARATION vs FREQUENCY 1k 1k 140 10 10 1 1 Current Noise Channel Separation (dB) 100 100 Current Noise (fA√Hz) Voltage Noise Voltage Noise (nV√Hz) 10k Frequency (Hz) 130 120 110 100 Dual Versions 90 0.1 0.1 1 10 100 1k 10k 100k 80 100 1M Frequency (Hz) 1k 10k 100k 1M Frequency (Hz) INPUT BIAS CURRENT vs INPUT COMMON-MODE VOLTAGE INPUT BIAS CURRENT vs TEMPERATURE 100 0.5 Input Bias Current (pA) Input Bias Current (pA) 0.4 10 1 0.1 0.3 0.2 0.1 0 0.01 –0.1 –75 –50 –25 0 25 50 75 100 125 –1 Temperature (°C) ® OPA337, OPA2337 OPA338, OPA2338 0 1 2 3 Common-Mode Voltage (V) 4 4 5 TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = +5V, and RL = 25kΩ connected to VS/2, unless otherwise noted. QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs TEMPERATURE AOL, CMRR, PSRR vs TEMPERATURE 600 130 120 550 120 110 110 100 PSRR 100 PSRR (dB) AOL, CMRR (dB) AOL IQ 11 10 500 –ISC 450 9 +ISC 400 8 80 350 7 70 300 90 90 12 Short-Circuit Current (mA) 130 Quiescent Current (µA) 140 CMRR 80 –75 –50 –25 0 25 50 75 100 6 –75 125 –50 –25 ±12 6 650 ±10 5 600 ±8 ±6 ±4 IQ ±2 450 400 Output Voltage (Vp-p) +ISC –ISC 3.0 3.5 4.0 4.5 5.0 OPA338 3 OPA337 2 100k 1M 10M OUTPUT VOLTAGE SWING vs OUTPUT CURRENT 2.5 VS = ±2.5V RL Tied to Ground 2.0 Output Voltage (V) THD+N (%) 1.5 G = +10, RL = 5kΩ, 25kΩ G = +5, RL = 5kΩ, 25kΩ G = +1 RL = 25kΩ 100 –55°C 0.5 25°C 0 125°C –0.5 –1.0 –55°C Sinking –2.0 –2.5 0.0001 20 Sourcing 1.0 –1.5 VO = 3Vp-p OPA337 OPA338 100M Frequency (Hz) 0.1 0.001 125 4 0 10k 5.5 TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY RL = 5kΩ 100 Maximum output voltage without slew rate-induced distortion. Supply Voltage (V) 0.01 75 1 0 2.5 50 MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 700 Short-Circuit Current (mA) Quiescent Current (µA) QUIESCENT AND SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE 500 25 Temperature (°C) Temperature (°C) 550 0 1k 10k 0 20k ±1 ±2 ±3 ±4 ±5 ±6 ±7 ±8 Output Current (mA) Frequency (Hz) 5 OPA337, OPA2337 OPA338, OPA2338 ® TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = +5V, and RL = 25kΩ connected to VS/2, unless otherwise noted. OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION OFFSET VOLTAGE PRODUCTION DISTRIBUTION 25 30 Typical distribution of packaged units 25 20 Percent of Amplifiers (%) Percent of Amplifiers (%) Typical distribution of packaged units. 15 10 5 20 15 10 5 0 3.0 2.5 2.0 1.5 1.0 0.5 0.0 –0.5 –1.0 –1.5 –2.0 –2.5 –3.0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Offset Voltage Drift (µV/°C) Offset Voltage (mV) SETTLING TIME vs CLOSED-LOOP GAIN SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE 100 60 50 Overshoot (%) 10 OPA338 OPA337 OPA338 (G = ±5) 40 OPA337 (G = ±1) 30 OPA337 (G = ±10) 20 OPA338 (G = ±50) 10 0.1% 1 0 1 10 100 1k 10 100 Closed-Loop Gain (V/V) 1k Load Capacitance (pF) LARGE-SIGNAL STEP RESPONSE CL = 100pF, VS = +5V SMALL-SIGNAL STEP RESPONSE C L = 100pF, VS = +5V OPA338 G=5 500mV/div OPA337 G=1 50mV/div Settling Time (µs) 0.01% OPA337 G=1 OPA338 G=5 2µs/div 1µs/div ® OPA337, OPA2337 OPA338, OPA2338 6 10k APPLICATIONS INFORMATION +5V The OPA337 series and OPA338 series are fabricated on a state-of-the-art CMOS process. The OPA337 series is unitygain stable. The OPA338 series is optimized for gains greater than or equal to five. Both are suitable for a wide range of general purpose applications. Power supply pins should be bypassed with 0.01µF ceramic capacitors. IOVERLOAD 10mA max FIGURE 2. Input Current Protection for Voltages Exceeding the Supply Voltage. The OPA337 series and OPA338 series can operate from a +2.5V to +5.5V single supply with excellent performance. Unlike most op amps which are specified at only one supply voltage, these op amps are specified for real-world applications; a single limit applies throughout the +2.7V to +5.5V supply range. This allows a designer to have the same assured performance at any supply voltage within the specified voltage range. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with operating voltage are shown in typical performance curves. USING THE OPA338 IN LOW GAINS The OPA338 series is optimized for gains greater than or equal to five. It has significantly wider bandwidth (12.5MHz) and faster slew rate (4.6V/µs) when compared to the OPA337 series. The OPA338 series can be used in lower gain configurations at low frequencies while maintaining its high slew rate with the proper compensation. Figure 3 shows the OPA338 in a unity-gain buffer configuration. At dc, the compensation capacitor C1 is effectively “open” resulting in 100% feedback (closed-loop gain = 1). As frequency increases, C1 becomes lower impedance and closed-loop gain increases, eventually becoming 1 + R2/R1 (in this case five, which is equal to the minimum gain required for stability). OPA337, VIN = ±3V Greater Than VS = ±2.5V VOUT, G = –1 (not limited by input commonmode range.) The required compensation capacitor value can be determined from the following equation: C1 = 1/(2πfCR1) 0 Since fC may shift with process variations, it is recommended that a value less than fC be used for determining C1. With fC = 1MHz and R1 = 2.5kΩ, the compensation capacitor is about 68pF. G = ±1 –3V VOUT 5kΩ OPERATING VOLTAGE 3V OPA337 VIN VOUT, G = +1 (limited by input common-mode range) The selection of the compensation capacitor C1 is important. A proper value ensures that the closed-loop circuit gain is greater than or equal to five at high frequencies. Referring to the “Open-Loop Gain vs Frequency” plot in the Typical Performance Curves section, the OPA338 gain line (dashed in the curve) has a constant slope (–20dB/decade) up to approximately 3MHz. This frequency is referred to as fC. Beyond fC the slope of the curve increases, suggesting that closed-loop gains less than 5 are not appropriate. FIGURE 1. OPA337—No Phase Inversion with Inputs Greater than the Power Supply Voltage. INPUT VOLTAGE The input common-mode range extends from (V–) – 0.2V to (V+) – 1.2V. For normal operation, inputs should be limited to this range. The absolute maximum input voltage is 500mV beyond the supplies. Inputs greater than the input common-mode range but less than maximum input voltage, while not valid, will not cause any damage to the op amp. Furthermore, if input current is limited the inputs may go beyond the power supplies without phase inversion (Figure 1) unlike some other op amps. Improved slew rate (4.6V/µs) versus OPA337 (1.2V/µs) in unity gain. R2 10kΩ R1 2.5kΩ C1 68pF Normally, input currents are 0.2pA. However, large inputs (greater than 500mV beyond the supply rails) can cause excessive current to flow in or out of the input pins. Therefore, as well as keeping the input voltage below the maximum rating, it is also important to limit the input current to less than 10mA. This is easily accomplished with an input resistor as shown in Figure 2. OPA338 VOUT VIN C1 = 1 2πfCR1 Where fC is the frequency at which closed-loop gains less than five are not appropriate—see text. FIGURE 3. Compensation of OPA338 for Unity-Gain Buffer. 7 OPA337, OPA2337 OPA338, OPA2338 ® Figure 4 shows a compensation technique using an inverting configuration. The low frequency gain is set by the resistor ratio while the high frequency gain is set by the capacitor ratio. As with the noninverting circuit, for frequencies above fC the gain must be greater than the recommended minimum stable gain for the op amp. The capacitor values shown are the nearest standard values. Capacitor values may need to be adjusted slightly to optimize performance. For more detailed information, consult the OPA686 product data sheet. Figure 5 shows the large-signal transient response using the circuit given in Figure 4. As shown, the OPA338 is stable in low gain applications and provides improved slew rate performance when compared to the OPA337. C2 15pF Improved slew rate versus OPA337 (see Figure 5). R2 10kΩ R1 5kΩ OPA338 C1 150pF C2 = OPA338 1 2πfCR2 500mV/div VIN VOUT OPA337 , C1 = (GH –1) • C2 2µs/div Where GH is the high frequency gain, GH = 1 + C1/C2 FIGURE 5. G = 2, Slew-Rate Comparison of OPA338 and OPA337. FIGURE 4. Inverting Compensation Circuit of OPA338 for Low Gain. TYPICAL APPLICATION Figure 6 shows the OPA2337 in a typical application. The ADS7822 is a 12-bit, micro-power sampling analog-todigital converter available in the tiny MSOP-8 package. As with the OPA2337, it operates with a supply voltage as low as +2.7V. When used with the miniature SOT-23-8 package of the OPA2337, the circuit is ideal for spacelimited and low power applications. In addition, OPA2337’s high input impedance allows large value resistors to be used which results in small physical capacitors, further reducing circuit size. For further information, consult the ADS7822 product data sheet. Resistors R1 and R2 are chosen to set the desired dc signal gain. Then the value for C2 is determined as follows: C2 = 1/(2πfCR2) C1 is determined from the desired high frequency gain (GH): C1 = (GH – 1) • C2 For a desired dc gain of 2 and high frequency gain of 10, the following resistor and capacitor values result: R1 = 10kΩ C1 = 150pF R2 = 5kΩ C2 = 15pF ® OPA337, OPA2337 OPA338, OPA2338 8 Passband 300Hz to 3kHz V+ = +2.7V to 5V R9 510kΩ R1 1.5kΩ R4 20kΩ R2 1MΩ C1 C3 Electret Microphone(1) R7 51kΩ 1/2 OPA2337E 1000pF R3 1MΩ R8 150kΩ 33pF 1/2 OPA2337E R6 100kΩ C2 1000pF VREF 1 +IN 2 –IN ADS7822 12-Bit A/D 3 NOTE: (1) Electret microphone with internal transistor (FET) powered by R1. R5 20kΩ V+ 8 DCLOCK 7 D OUT 6 Serial Interface CS/SHDN 5 GND 4 G = 100 FIGURE 6. Low Power, Single-Supply, Speech Bandpass Filtered Data Acquisition System. SOT-23-8 (Package Drawing #348) SOT-23-5 (Package Drawing #331) 0.075 (1.905) 0.0375 (0.9525) 0.10 (2.54) 0.10 (2.54) 0.035 (0.889) 0.035 (0.889) 0.027 (0.686) 0.0375 (0.9525) 0.026 (0.66) 0.018 (0.457) Refer to end of data sheet or Appendix C of Burr-Brown IC Data Book for tolerances and detailed package drawing. For further information on solder pads for surface-mount packages, consult Application Bulletin AB-132. FIGURE 7. Recommended SOT-23-5 and SOT-23-8 Solder Footprints. 9 OPA337, OPA2337 OPA338, OPA2338 ®