OPA342 OPA2342 OPA4342 ® OPA 434 2 OPA 342 OPA 234 2 ® OPA OPA 434 2 342 For most current data sheet and other product information, visit www.burr-brown.com Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ™ Series FEATURES DESCRIPTION LOW QUIESCENT CURRENT: 150µA typ RAIL-TO-RAIL INPUT RAIL-TO-RAIL OUTPUT (within 1mV) SINGLE SUPPLY CAPABILITY LOW COST MicroSIZE PACKAGE OPTIONS: SOT23-5 MSOP-8 TSSOP-14 ● BANDWIDTH: 1MHz ● SLEW RATE: 1V/µs ● THD + NOISE: 0.006% The OPA342 series rail-to-rail CMOS operational amplifiers are designed for low cost, low power, miniature applications. They are optimized to operate on a single supply as low as 2.5V with an input common-mode voltage range that extends 300mV beyond the supplies. Rail-to-rail input/output and high-speed operation make them ideal for driving sampling Analog-to-Digital Converters (ADC). They are also well suited for general purpose and audio applicaitons and providing I/V conversion at the output of Digital-to-Analog Converters (DAC). Single, dual and quad versions have identical specs for design flexibility. The OPA342 series offers excellent dynamic response with a quiescent current of only 250µA max. Dual and quad designs feature completely independent circuitry for lowest crosstalk and freedom from interaction. ● ● ● ● ● ● APPLICATIONS ● ● ● ● ● ● ● ● COMMUNICATIONS PCMCIA CARDS DATA ACQUISITION PROCESS CONTROL AUDIO PROCESSING ACTIVE FILTERS TEST EQUIPMENT CONSUMER ELECTRONICS PACKAGE SINGLE OPA342 SOT23-5 ✔ QUAD OPA4342 ✔ MSOP-8 SO-8 DUAL OPA2342 ✔ ✔ TSSOP-14 ✔ SO-14 ✔ DIP-14 ✔ SPICE MODEL available at www.burr-brown.com. 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 © 1999 Burr-Brown Corporation PDS-1485B Printed in U.S.A. June, 2000 SPECIFICATIONS: VS = 2.7V to 5.5V At TA = +25°C, RL = 10kΩ connected to VS /2 and VOUT = VS /2, unless otherwise noted. Boldface limits apply over the temperature range, TA = –40°C to +85°C. OPA342NA, UA OPA2342EA, UA OPA4342EA, UA, PA PARAMETER CONDITION OFFSET VOLTAGE Input Offset Voltage TA = –40°C to +85°C vs Temperature vs Power Supply TA = –40°C to +85°C Channel Separation, dc f = 1kHz VS = 2.7V to 5.5V, VCM < (V+) -1.8V VS = 2.7V to 5.5V, VCM < (V+) -1.8V 200 250 8 30 0.5 VCM CMRR CMRR CMRR VS = +5.5V, –0.3V < VCM < (V+) - 1.8 VS = +5.5V, –0.3V < VCM < (V+) - 1.8 VS = +5.5V, –0.3V < VCM < 5.8V VS = +5.5V, –0.3V < VCM < 5.8V VS = +2.7V, –0.3V < VCM < 3V VS = +2.7V, –0.3V < VCM < 3V AOL RL RL RL RL = 100kΩ, 10mV < VO < (V+) – 10mV = 100kΩ, 10mV < VO < (V+) – 10mV = 5kΩ, 400mV < VO < (V+) – 400mV = 5kΩ, 400mV < VO < (V+) – 400mV FREQUENCY RESPONSE Gain-Bandwidth Product GBW Slew Rate SR Settling Time, 0.1% 0.01% Overload Recovery Time Total Harmonic Distortion + Noise, f = 1kHz THD+N OUTPUT Voltage Output Swing from Rail(2) TA = –40°C to +85°C TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance SOT23-5 Surface Mount MSOP-8 Surface Mount SO-8 Surface Mount TSSOP-14 Surface Mount SO-14 Surface Mount DIP-14 mV mV µV/°C µV/V µV/V µV/V dB 30 en in TA = –40°C to +85°C POWER SUPPLY Specified Voltage Range Operating Voltage Range Quiescent Current (per amplifier) TA = –40°C to +85°C ±6 ±6 IOS –0.3 76 74 66 64 62 60 INPUT IMPEDANCE Differential Common-Mode TA = –40°C to +85°C Short-Circuit Current Capacitive Load Drive UNITS ±1 ±3 ±0.2 See Typical Curve ±0.2 IB NOISE Input Voltage Noise, f = 0.1Hz to 50kHz Input Voltage Noise Density, f = 1kHz Current Noise Density, f = 1kHz OPEN-LOOP GAIN Open-Loop Voltage Gain TA = –40°C to +85°C MAX 0.2 132 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 Common-Mode Rejection Ratio TA = –40°C to +85°C Common-Mode Rejection Ratio TA = –40°C to +85°C TYP ±1 VCM = VS /2 VOS dVOS/dT PSRR MIN I SC CLOAD CL = 100pF G=1 RL = 100kΩ, AOL ≥ 96dB RL = 100kΩ, AOL ≥ 104dB RL = 100kΩ, AOL ≥ 100dB RL = 5kΩ, AOL ≥ 96dB RL = 5kΩ, AOL ≥ 90dB Per Channel (V+) + 0.3 78 74 Ω || pF Ω || pF 124 dB dB dB dB 114 20 10 10 400 400 5.5 2.5 to 5.5 150 θJA 200 150 150 100 100 100 NOTE: (1) VOUT = 0.25V to 3.25V. (2) Output voltage swings are measured between the output and power-supply rails. 2 MHz V/µs µs µs µs % ±15 See Typical Curve –40 –55 –65 OPA342, 2342, 4342 V dB dB dB dB dB dB 1013 || 3 1013 || 6 1 3 IO = 0A pA pA pA µVrms nV/√Hz fA/√Hz 88 2.7 ® ±10 1 1 5 8 2.5 0.006 VS = 5.5V, 2V Step VS = 5.5V, 2V Step VIN • G = VS VS = 5.5V, VO = 3Vp-p(1), G = 1 VS IQ 104 100 96 90 ±10 mV mV mV mV mV mA 250 300 V V µA µA +85 +125 +150 °C °C °C °C/W °C/W °C/W °C/W °C/W °C/W ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage, V+ to V- ................................................................... 7.5V Signal Input Terminals, Voltage(2) ..................... (V–) –0.5V to (V+) +0.5V Current(2) .................................................... 10mA Output Short-Circuit(3) .............................................................. Continuous Operating Temperature .................................................. –55°C to +125°C Storage Temperature ..................................................... –65°C to +150°C Junction Temperature ...................................................................... 150°C Lead Temperature (soldering, 10s) ................................................. 300°C ESD Tolerance (Human Body Model) ............................................ 4000V 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 conditions for extended periods may degrade device reliability. These are stress ratings only. Functional operation of the device at these conditions, or beyond the specified operating conditions, is not implied. (2) Input terminals are diode-clamped to the power supply rails. Input signals that can swing more than 0.5V beyond the supply rails should be current-limited to 10mA or less. (3) Short-circuit to ground, one amplifier per package. PACKAGE/ORDERING INFORMATION PRODUCT PACKAGE PACKAGE DRAWING NUMBER OPA342NA SOT23-5 331 –40°C to +85°C B42 " " " " OPA342UA " OPA342UA SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(1) TRANSPORT MEDIA OPA342NA /250 OPA342NA /3K OPA342UA OPA342UA /2K5 Tape and Reel Tape and Reel Rails Tape and Reel OPA2342EA /250 OPA2342EA /2K5 OPA2342UA OPA2342UA /2K5 Tape and Reel Tape and Reel Rails Tape and Reel OPA4342EA /250 OPA4342EA /2K5 OPA4342UA OPA4342UA /2K5 OPA4342PA Tape and Reel Tape and Reel Rails Tape and Reel Rails SO-8 182 –40°C to +85°C " " " " " OPA2342EA MSOP-8 337 –40°C to +85°C C42 " " " " " OPA2342UA SO-8 182 –40°C to +85°C OPA2342UA " " " " " OPA4342EA TSSOP-14 357 –40°C to +85°C OPA4342EA " " " " " OPA4342UA SO-14 235 –40°C to +85°C OPA4342UA " " " " " OPA4342PA DIP-14 010 –40°C to +85°C OPA4342PA NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /3K indicates 3000 devices per reel). Ordering 3000 pieces of “OPA342NA/3K” will get a single 3000-piece Tape and Reel. ® 3 OPA342, 2342, 4342 TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted. POWER SUPPLY AND COMMON-MODE REJECTION RATIO vs FREQUENCY OPEN-LOOP GAIN/PHASE vs FREQUENCY 120 100 100 30 80 +PSRR Rejection Ratio (dB) Phase 80 60 60 90 40 120 Phase (°) Gain (dB) 0 Gain 20 0.1 1 10 100 1k 10k 100k 1M –PSRR 60 40 20 150 0 CMRR 10 180 10M 10 100 VS = +5.5V 5 Channel Separation (dB) Maximum Output Voltage (Vp-p) 100k 140 VS = +5V 4 3 VS = +2.7V 2 1 0 120 100 Dual and quad devices. G = 1, all channels. Quad measured channel A to D or B to C—other combinations yield improved rejection. 80 60 100k 10k 100 1M 100k VOLTAGE AND CURRENT NOISE SPECTRAL DENSITY vs FREQUENCY TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY VN 1 100 10 100 1k 10k 100k 1M 0.1 THD+N (%) 10 0.1 10M 0.010 0.001 20 Frequency (Hz) 100 1k Frequency (Hz) ® OPA342, 2342, 4342 1M 1 Current Noise (fA/√Hz) IN 1000 10 10k Frequency (Hz) 100 1 1k Frequency (Hz) 10000 Voltage Noise (nV/√Hz) 10k CHANNEL SEPARATION vs FREQUENCY MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 6 1k Frequency (Hz) Frequency (Hz) 4 10k 20k TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted. OPEN-LOOP GAIN, COMMON-MODE REJECTION RATIO, AND POWER SUPPLY REJECTION vs TEMPERATURE INPUT BIAS CURRENT vs TEMPERATURE 140 10000 AOL Input Bias Current (pA) AOL, CMRR, PSRR (dB) 120 100 CMRR 80 PSRR 60 40 20 0 1000 100 10 1 0.1 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 Temperature (°C) 0 25 50 75 100 125 Temperature (°C) QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs TEMPERATURE SLEW RATE vs TEMPERATURE 200 40 1.2 35 1 150 30 135 25 +ISC 20 100 –ISC 75 15 50 10 25 5 0 –75 –50 0 –25 25 50 75 100 Slew Rate (V/µs) Quiescent Current (µA) IQ Short-Circuit Current (mA) –SR 175 0.8 +SR 0.6 0.4 0.2 0 0 125 –75 –50 –25 0 25 50 75 100 Temperature (°C) Temperature (°C) INPUT BIAS CURRENT vs COMMON-MODE VOLTAGE QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE 125 160 6 20 V– Supply 2 V+ Supply Quiescent Current (µA) Input Bias Current (pA) 4 0 –2 Input voltage ≤ –0.3V can cause op amp output to lock up. See text. –4 155 15 –ISC 150 10 IQ 145 5 140 –6 –1 0 1 2 3 4 5 0 2 6 Short-Circuit Current (mA) +ISC 3 4 5 6 Supply Voltage (V) Common-Mode Voltage (V) ® 5 OPA342, 2342, 4342 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted. OPEN-LOOP GAIN vs OUTPUT VOLTAGE SWING OUTPUT VOLTAGE SWING vs OUTPUT CURRENT V+ 120 (V+) – 2 2 85°C 25°C ≈ Open-Loop Gain (dB) –40°C ≈ 25°C –40°C 1 85°C 0 10 15 RL = 100kΩ 100 RL = 5kΩ 90 120 20 100 80 60 40 20 Output Current (mA) Output Voltage Swing from Rail (mV) OFFSET VOLTAGE PRODUCTION DISTRIBUTION OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 24 0 18 Typical production distribution of packaged units. Typical production distribution of packaged units. 16 Percent of Amplifiers (%) 20 Percent of Amplifiers (%) 110 80 5 0 16 12 8 4 14 12 10 8 6 4 2 0 –6 –5.4 –4.8 –4.2 –3.6 –3 –2.4 –1.8 –1.2 –0.6 0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6 –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10 0 Offset Voltage (mV) Offset Voltage Drift (µV/°C) QUIESCENT CURRENT PRODUCTION DISTRIBUTION SETTLING TIME vs CLOSED-LOOP GAIN 24 400 350 20 Settling Time (µs) 300 16 12 8 250 0.01% 200 150 100 0.1% 4 50 0 <250 <225 <200 <175 <150 <125 <100 <75 <50 <25 0 <0 Percent of Amplifiers (%) Output Voltage (V) (V+) – 1 1 Quiescent Current (µA) ® OPA342, 2342, 4342 10 100 Closed-Loop Gain (V/V) 6 1000 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted. LARGE-SIGNAL STEP RESPONSE G = +1, RL = 10kΩ, CL = 100pF SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE 50 40 35 1V/div G = +1 30 G = +5 25 G = –1 20 15 10 G = –5 5 0 1 10 100 1k 10k 5µs/div Load Capacitance (pF) SMALL-SIGNAL STEP RESPONSE G = +1, RL = 10kΩ, CL = 100pF 20mV/div Small-Signal Overshoot (%) 45 5µs/div ® 7 OPA342, 2342, 4342 APPLICATIONS INFORMATION OPERATING VOLTAGE OPA342 series op amps are fully specified and guaranteed from +2.7V to +5.5V. In addition, many specifications apply from –40ºC to +85ºC. Parameters that vary significantly with operating voltages or temperature are shown in the Typical Performance Curves. OPA342 series op amps are unity gain stable and can operate on a single supply, making them highly versatile and easy to use. Rail-to-rail input and output swing significantly increases dynamic range, especially in low supply applications. Figure 1 shows the input and output waveforms for the OPA342 in unity-gain configuration. Operation is from VS = +5V with a 10kΩ load connected to VS /2. The input is a 5Vp-p sinusoid. Output voltage is approximately 4.997Vp-p. RAIL-TO-RAIL INPUT The input common-mode voltage range of the OPA342 series extends 300mV beyond the supply rails. This is achieved with a complementary input stage—an N-channel input differential pair in parallel with a P-channel differential pair (see Figure 2). The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 1.3V to 300mV above the positive supply, while the P-channel pair is on for inputs from 300mV below the negative supply to approximately (V+) –1.3V. There is a small transition region, typically (V+) – 1.5V to (V+) – 1.1V, in which both pairs are on. This 400mV transition region can vary 300mV with process variation. Thus, the transition region (both stages on) can range from (V+) – 1.8V to (V+) – 1.4V on the low end, up to (V+) – 1.2V to (V+) – 0.8V on the high end. Within the 400mV transition region PSRR, CMRR, offset voltage, offset drift, and THD may be degraded compared to operation outside this region. For more information on designing with rail-to-rail input op amps, see Figure 3 “Design Optimization with Rail-to-Rail Input Op Amps.” Power supply pins should be by passed with 0.01pF ceramic capacitors. G = +1, VS = +5V Input 1V/div 5V 0V Output (inverted on scope) 5µs/div FIGURE 1. Rail-to-Rail Input and Output. V+ Reference Current VIN+ VIN– VBIAS1 VBIAS2 V– (Ground) FIGURE 2. Simplified Schematic. ® OPA342, 2342, 4342 8 Class AB Control Circuitry VO DESIGN OPTIMIZATION WITH RAIL-TO-RAIL INPUT OP AMPS Rail-to-rail op amps can be used in virtually any op amp configuration. To achieve optimum performance, however, applications using these special double-input-stage op amps may benefit from consideration of their special behavior. With a unity-gain buffer, for example, signals will traverse this transition at approximately 1.3V below V+ supply and may exhibit a small discontinuity at this point. The common-mode voltage of the non-inverting amplifier is equal to the input voltage. If the input signal always remains less than the transition voltage, no discontinuity will be created. The closed-loop gain of this configuration can still produce a rail-to-rail output. Inverting amplifiers have a constant common-mode voltage equal to VB. If this bias voltage is constant, no discontinuity will be created. The bias voltage can generally be chosen to avoid the transition region. In many applications, operation remains within the common-mode range of only one differential input pair. However some applications exercise the amplifier through the transition region of both differential input stages. Although the two input stages are laser trimmed for excellent matching, a small discontinuity may occur in this transition. Careful selection of the circuit configuration, signal levels and biasing can often avoid this transition region. G = 1 Buffer Non-Inverting Gain V+ Inverting Amplifier V+ VB VO VIN V+ VIN VO VO VIN VB VCM = VIN = VO VCM = VIN VCM = VB FIGURE 3. Design Optimization with Rail-to-Rail Input Op Amps. COMMON-MODE REJECTION The CMRR for the OPA342 is specified in several ways so the best match for a given application may be used. First, the CMRR of the device in the common-mode range below the transition region (VCM < (V+) – 1.8V) is given. This specification is the best indicator of the capability of the device when the application requires use of one of the differential input pairs. Second, the CMRR at VS = 5.5V over the entire common-mode range is specified. Third, the CMRR at VS = 2.7V over the entire common-mode range is provided. These last two values include the variations seen through the transition region. between V+ and ground. For light resistive loads (> 50kΩ), the output voltage can typically swing to within 1mV from supply rail. With moderate resistive loads (2kΩ to 50kΩ), the output can swing to within a few tens of milli-volts from the supply rails while maintaining high open-loop gain. See the typical performance curve “Output Voltage Swing vs Output Current.” V+ IOVERLOAD 10mA max INPUT VOLTAGE BEYOND THE RAILS OPA342 VOUT VIN If the input voltage can go more than 0.3V below the negative power supply rail (single-supply ground), special precautions are required. If the input voltage goes sufficiently negative, the op amp output may lock up in an inoperative state. A Schottky diode clamp circuit will prevent this—see Figure 4. The series resistor prevents excessive current (greater than 10mA) in the Schottky diode and in the internal ESD protection diode, if the input voltage can exceed the positive supply voltage. If the signal source is limited to less than 10mA, the input resistor is not required. 1kΩ IN5818 Schottky diode is required only if input voltage can go more than 0.3V below ground. FIGURE 4. Input Current Protection for Voltages Exceeding the Supply Voltage. CAPACITIVE LOAD AND STABILITY The OPA342 in a unity-gain configuration can directly drive up to 250pF pure capacitive load. Increasing the gain enhances the amplifier’s ability to drive greater capacitive loads. See the typical performance curve “Small-Signal RAIL-TO-RAIL OUTPUT A class AB output stage with common-source transistors is used to achieve rail-to-rail output. This output stage is capable of driving 600Ω loads connected to any potential ® 9 OPA342, 2342, 4342 DRIVING A/D CONVERTERS The OPA342 series op amps are optimized for driving medium-speed sampling ADCs. The OPA342 op amps buffer the ADC’s input capacitance and resulting charge injection while providing signal gain. Overshoot vs Capacitive Load.” In unity-gain configurations, capacitive load drive can be improved by inserting a small (10Ω to 20Ω) resistor, RS, in series with the output, as shown in Figure 5. This significantly reduces ringing while maintaining dc performance for purely capacitive loads. However, if there is a resistive load in parallel with the capacitive load, a voltage divider is created, introducing a dc error at the output and slightly reducing the output swing. The error introduced is proportional to the ratio RS / RL, and is generally negligible. Figures 6 shows the OPA342 in a basic noninverting configuration driving the ADS7822. The ADS7822 is a 12-bit, micro-power sampling converter in the MSOP-8 package. When used with the low-power, miniature packages of the OPA342, the combination is ideal for space-limited, lowpower applications. In this configuration, an RC network at the ADC’s input can be used to filter charge injection. Figure 7 shows the OPA2342 driving an ADS7822 in a speech bandpass filtered data acquisition system. This small, low-cost solution provides the necessary amplification and signal conditioning to interface directly with an electret microphone. This circuit will operate with VS = +2.7V to +5V with less than 500µA quiescent current. V+ RS VOUT OPA342 10Ω to 20Ω VIN RL CL FIGURE 5. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive. +5V 0.1µF 0.1µF 1 VREF 8 V+ DCLOCK 500Ω +In OPA342 ADS7822 12-Bit A/D 2 VIN DOUT –In CS/SHDN 3 3300pF 7 6 Serial Interface 5 GND 4 VIN = 0V to 5V for 0V to 5V output. NOTE: A/D Input = 0 to VREF RC network filters high frequency noise. FIGURE 6. OPA342 in Noninverting Configuration Driving ADS7822. V+ = +2.7V to 5V Passband 300Hz to 3kHz R9 510kΩ R1 1.5kΩ R2 1MΩ R4 20kΩ C3 33pF C1 1000pF 1/2 OPA2342 Electret Microphone(1) R3 1MΩ R6 100kΩ R7 51kΩ R8 150kΩ VREF 1 8 V+ 7 C2 1000pF 1/2 OPA2342 +IN ADS7822 6 12-Bit A/D 5 2 –IN 3 4 NOTE: (1) Electret microphone powered by R1. R5 20kΩ G = 100 GND FIGURE 7. Speech Bandpass Filtered Data Acquisition System. ® OPA342, 2342, 4342 10 DCLOCK DOUT CS/SHDN Serial Interface