OPA2379AIDG4

OP A3 OPA 79 OPA379 OPA2379 OPA4379 OPA 4379 2379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 1.8V, 2.9µA, 90kHz, Rail-to-Rail I/O OPERATIONAL AMPLIFIERS FEATURES 1 • • • • 2 • • LOW NOISE: 2.8µVPP (0.1Hz - 10Hz) microPower: 5.5µA (max) LOW OFFSET VOLTAGE: 1.5mV (max) DC PRECISION: – CMRR: 100dB – PSRR: 2µV/V – AOL: 120dB WIDE SUPPLY VOLTAGE RANGE: 1.8V to 5.5V microSize PACKAGES: – SC70-5, SOT23-5, SOT23-8, SO-8, TSSOP-14 APPLICATIONS • • • • DESCRIPTION The OPA379 family of micropower, low-voltage operational amplifiers is designed for battery-powered applications. These amplifiers operate on a supply voltage as low as 1.8V (±0.9V). High-performance, single-supply operation with rail-to-rail capability (10µV max) makes the OPA379 family useful for a wide range of applications. In addition to microSize packages, the OPA379 family of op amps features impressive bandwidth (90kHz), low bias current (5pA), and low noise (80nV/√Hz) relative to the very low quiescent current (5.5µA max). The OPA379 (single) is available in SC70-5, SOT23-5, and SO-8 packages. The OPA2379 (dual) comes in SOT23-8 and SO-8 packages. The OPA4379 (quad) is offered in a TSSOP-14 package. All versions are specified from –40°C to +125°C. BATTERY-POWERED INSTRUMENTS PORTABLE DEVICES MEDICAL INSTRUMENTS HANDHELD TEST EQUIPMENT xxx xxx xxx xxx xxx xxx xxx VS Table 1. OPAx379 RELATED PRODUCTS 1/2 OPA2379 FEATURES C2 C1 C RF REF S W VS RB RL R1 1/2 OPA2379 VOUT PRODUCT 1µA, 70kHz, 2mV VOS, 1.8V to 5.5V Supply OPAx349 1µA, 5.5kHz, 390µV VOS, 2.5V to 16V Supply TLV240x 1µA, 5.5kHz, 0.6mV VOS, 2.5V to 12V Supply TLV224x 7µA, 160kHz, 0.5mV VOS, 2.7V to 16V Supply TLV27Lx 7µA, 160kHz, 0.5mV VOS, 2.7V to 16V Supply TLV238x 20µA, 350kHz, 2mV VOS, 2.3V to 5.5V Supply OPAx347 20µA, 500kHz, 550µV VOS, 1.8V to 3.6V Supply TLV276x 45µA, 1MHz, 1mV VOS, 2.1V to 5.5V Supply OPAx348 R1 Figure 1. OPA2379 in Portable Gas Meter Application 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2005–2008, Texas Instruments Incorporated OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments 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. ABSOLUTE MAXIMUM RATINGS (1) Over operating free-air temperature range (unless otherwise noted). Supply Voltage OPA379, OPA2379, OPA4379 UNIT +7 V VS = (V+) – (V–) Signal Input Terminals, Voltage (2) (V–) – 0.5 to (V+) + 0.5 V Signal Input Terminals, Current (2) ±10 mA Output Short-Circuit (3) Continuous Operating Temperature TA –40 to +125 °C Storage Temperature TA –65 to +150 °C Junction Temperature TJ +150 °C Human Body Model (HBM) 2000 V Charged Device Model (CDM) 1000 V ESD Rating (1) (2) (3) 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, and functional operation of the device at these or any other conditions beyond those specified is not supported. 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. Short-circuit to ground, one amplifier per package. PACKAGE/ORDERING INFORMATION (1) PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR PACKAGE MARKING SC70−5 DCK AYR OPA379 SOT23−5 DBV B53 SO−8 D OPA379A SOT23−8 DCN B61 SO−8 D OPA2379A TSSOP−14 PW OPA4379A OPA2379 OPA4379 (1) 2 For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 PIN CONFIGURATIONS OPA379 SC70-5 (TOP VIEW) +IN 1 V- 2 -IN 3 OPA379 SOT23-5 (TOP VIEW) 5 V+ 4 OUT OUT 1 (1) V+ 4 -IN V- 2 +IN 3 OPA2379(2) SOT23-8 (TOP VIEW) OPA379 SO-8 (TOP VIEW) 8 V+ -IN 2 7 OUT B OUT +IN 3 6 -IN B (1) V- 4 5 +IN B NC -IN 2 7 V+ +IN 3 6 5 NC OPA2379 SO-8 (TOP VIEW) B61 1 8 V- 4 (1) OUT A 1 NC 5 OPA4379 TSSOP-14 (TOP VIEW) OUT A 1 14 OUT D OUT B -IN A 2 13 -IN D 6 -IN B +IN A 3 12 +IN D 5 +IN B V+ 4 11 V- +IN B 5 10 +IN C -IN B 6 9 -IN C OUT B 7 8 OUT C OUT A 1 8 V+ -IN A 2 7 +IN A 3 V- 4 (1) NC denotes no internal connection. (2) Pin 1 of the SOT23−8 package is determined by orienting the package marking as shown. Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 Submit Documentation Feedback 3 OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS: VS = +1.8V to +5.5V Boldface limits apply over the specified temperature range indicated. At TA = +25°C, RL = 25kΩ connected to VS/2, and VCM < (V+) – 1V, unless otherwise noted. OPA379, OPA2379, OPA4379 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 0.4 1.5 mV OFFSET VOLTAGE Initial Offset Voltage VOS VS = 5V Over –40°C to +125°C Drift, –40°C to +85°C 2 dVOS/dT Drift, –40°C to +125°C vs Power Supply µV/°C 2.7 PSRR 2 Over –40°C to +125°C mV µV/°C 1.5 10 µV/V 20 µV/V INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection Ratio (1) VCM CMRR (V–) – 0.1 to (V+) + 0.1 100 V (V–) < VCM < (V+) – 1V 90 dB Over –40°C to +85°C (V–) < VCM < (V+) – 1V 80 dB Over –40°C to +125°C (V–) < VCM < (V+) – 1V 62 dB INPUT BIAS CURRENT Input Bias Current Input Offset Current IB VS = 5V, VCM ≤ VS/2 ±5 ±50 pA IOS VS = 5V ±5 ±50 pA INPUT IMPEDANCE 1013 || 3 Differential 13 Common-Mode 10 Ω || pF Ω || pF || 6 NOISE f = 0.1Hz to 10Hz 2.8 µVPP Input Voltage Noise Density en f = 1kHz 80 nV/√Hz Input Current Noise Density in f = 1kHz 1 fA/√Hz Input Voltage Noise OPEN-LOOP GAIN Open-Loop Voltage Gain VS = 5V, RL = 25kΩ, 100mV < VO < (V+) – 100mV 100 Over –40°C to +125°C AOL VS = 5V, RL = 25kΩ, 100mV < VO < (V+) – 100mV 80 VS = 5V, RL = 5kΩ, 500mV < VO < (V+) – 500mV 100 Over –40°C to +125°C VS = 5V, RL = 5kΩ, 500mV < VO < (V+) – 500mV 80 120 dB dB 120 dB dB OUTPUT Voltage Output Swing from Rail RL = 25kΩ Over –40°C to +125°C RL = 25kΩ Over –40°C to +125°C RL = 5kΩ 5 RL = 5kΩ Short-Circuit Current Capacitive Load Drive Closed-Loop Output Impedance ISC ROUT RO FREQUENCY RESPONSE 50 mV 75 mV mA G = 1, f = 1kHz, IO = 0 10 Ω f = 100kHz, IO = 0 28 kΩ CLOAD = 30pF SR Overload Recovery Time Turn-On Time 4 mV See Typical Characteristics GBW Slew Rate (1) mV 15 ±5 CLOAD Open-Loop Output Impedance Gain Bandwidth Product 25 10 90 kHz G = +1 0.03 V/µs VIN × GAIN > VS 25 µs 1 ms tON See Typical Characteristic gragh, Common-Mode Rejection Ratio vs Frequency (Figure 3). Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ELECTRICAL CHARACTERISTICS: VS = +1.8V to +5.5V (continued) Boldface limits apply over the specified temperature range indicated. At TA = +25°C, RL = 25kΩ connected to VS/2, and VCM < (V+) – 1V, unless otherwise noted. OPA379, OPA2379, OPA4379 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT POWER SUPPLY Specified/Operating Voltage Range VS Quiescent Current per Amplifier IQ 1.8 VS = 5.5V, IO = 0 2.9 Over –40°C to +125°C 5.5 V 5.5 µA 10 µA TEMPERATURE Specified/Operating Range TA –40 +125 °C Storage Range TJ –65 +150 °C Thermal Resistance θJA SC70−5 250 °C/W SOT23−5 200 °C/W SOT23−8, TSSOP−14, SO−8 150 °C/W Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 Submit Documentation Feedback 5 OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VS = 5V, and RL = 25kΩ connected to VS/2, unless otherwise noted. COMMON-MODE AND POWER-SUPPLY REJECTION RATIO vs FREQUENCY 0 120 100 -30 100 80 -60 60 -90 40 -120 20 -150 20 -180 100k 0 0 0.1 1 10 100 1k 10k CMRR and PSRR (dB) 120 Phase (°) Gain (dB) OPEN-LOOP GAIN AND PHASE vs FREQUENCY -PSRR 80 +PSRR 60 40 CMRR 0.1 1 10 Frequency (Hz) 100 1k Frequency (Hz) 10k Figure 2. Figure 3. MAXIMUM OUTPUT VOLTAGE vs FREQUENCY QUIESCENT CURRENT vs SUPPLY VOLTAGE 100k 3.5 5.0 4.5 Quiescent Current (mA) Output Voltage (VPP) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 3.0 2.5 2.0 0.5 1.5 0 1k 10k 100k 1.5 2.0 2.5 Frequency (Hz) 3.5 4.0 4.5 Figure 4. Figure 5. OUTPUT VOLTAGE vs OUTPUT CURRENT SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE 2.5 5.0 5.5 5.0 5.5 25 2.0 VS = ±2.5V 1.0 0.5 +125°C 0 +85°C +25°C -40°C -0.5 -1.0 -1.5 Short-Circuit Current (mA) +ISC 1.5 VOUT (V) 3.0 Supply Voltage (V) 20 -ISC 15 10 -2.0 5 -2.5 0 1 2 3 4 5 6 7 8 9 10 1.5 2.0 2.5 IOUT (mA) Figure 6. 6 Submit Documentation Feedback 3.0 3.5 4.0 4.5 Supply Voltage (V) Figure 7. Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = 5V, and RL = 25kΩ connected to VS/2, unless otherwise noted. OFFSET VOLTAGE vs COMMON-MODE VOLTAGE vs TEMPERATURE 15.0 12.5 Unit 1 Common-Mode Input Range 10.0 7.5 CMRR Specified Range 5.0 Population 2.5 0 -2.5 -5.0 -7.5 -40°C +85°C +125°C -10.0 -12.5 -15.0 -0.5 0 Unit 2 -1500 -1350 -1200 -1050 -900 -750 -600 -450 -300 -150 0 150 300 450 600 750 900 1050 1200 1350 1500 Offset Voltage (mV) OFFSET VOLTAGE PRODUCTION DISTRIBUTION 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Common-Mode Voltage (V) Offset Voltage (mV) Figure 9. OFFSET VOLTAGE DRIFT DISTRIBUTION (–40°C to +85°C) OFFSET VOLTAGE DRIFT DISTRIBUTION (–40°C to +125°C) Population Population Figure 8. £1 £2 £3 £4 £5 £1 >5 £2 £3 £4 £5 >5 Offset Voltage Drift (mV/°C) Offset Voltage Drift (mV/°C) Figure 10. Figure 11. QUIESCENT CURRENT vs TEMPERATURE QUIESCENT CURRENT PRODUCTION DISTRIBUTION 5.0 4.5 Population 4.0 IQ (mA) 3.5 3.0 2.5 2.0 1.0 -50 -25 0 25 50 75 100 125 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 1.5 Temperature (°C) Figure 12. Quiescent Current (mA) Figure 13. Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 Submit Documentation Feedback 7 OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = 5V, and RL = 25kΩ connected to VS/2, unless otherwise noted. INPUT BIAS CURRENT vs TEMPERATURE 0.1Hz TO 10Hz NOISE 10000 100 1mV/div Input Bias Current (pA) 1000 10 1 0.1 0.01 -50 0 -25 25 50 Temperature (°C) 75 100 2.5s/div 125 Figure 14. Figure 15. NOISE vs FREQUENCY SMALL-SIGNAL OVERSHOOT vs CAPACITIVE LOAD 1000 60 Overshoot (%) Noise (nV/ÖHz) 50 100 40 30 G = +1 20 10 G = -1 10 0 1 10 100 1k 10k 10 100 Frequency (Hz) Figure 17. SMALL-SIGNAL STEP RESPONSE LARGE-SIGNAL STEP RESPONSE 500mV/div Figure 16. 20mV/div 8 1000 Capacitive Load (pF) 25ms/div 50ms/div Figure 18. Figure 19. Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 APPLICATION INFORMATION The OPA379 family of operational amplifiers minimizes power consumption without compromising bandwidth or noise. Power-supply rejection ratio (PSRR), common-mode rejection ratio (CMRR), and open-loop gain (AOL) typical values are 100dB or better. When designing for ultra-low power, choose system components carefully. To minimize current consumption, select large-value resistors. Any resistors will react with stray capacitance in the circuit and the input capacitance of the operational amplifier. These parasitic RC combinations can affect the stability of the overall system. A feedback capacitor may be required to assure stability and limit overshoot or gain peaking. Good layout practice mandates the use of a 0.1µF bypass capacitor placed closely across the supply pins. OPERATING VOLTAGE OPA379 series op amps are fully specified and tested from +1.8V to +5.5V (±0.9V to ±2.75V). Parameters that will vary with supply voltage are shown in the Typical Characteristics curves. INPUT COMMON-MODE VOLTAGE RANGE The input common-mode voltage range of the OPA379 family typically extends 100mV beyond each supply rail. This rail-to-rail input is achieved using a complementary input stage. CMRR is specified from the negative rail to 1V below the positive rail. Between (V+) – 1V and (V+) + 0.1V, the amplifier operates with higher offset voltage because of the transition region of the input stage. See the typical characteristic, Offset Voltage vs Common-Mode Voltage vs Temperature (Figure 8). PROTECTING INPUTS FROM OVER-VOLTAGE Normally, input currents are 5pA. However, a large voltage input (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 limiting is easily accomplished with an input voltage resistor, as shown in Figure 20. VS IOVERLOAD 10mA max OPA379 VOUT VIN 5kW Figure 20. Input Current Protection for Voltages Exceeding the Supply Voltage NOISE Although micropower amplifiers frequently have high wideband noise, the OPA379 series offer excellent noise performance. Resistors should be chosen carefully because the OPA379 has only 2.8µVPP of 0.1Hz to 10Hz noise, and 80nV/√Hz of wideband noise; otherwise, they can become the dominant source of noise. CAPACITIVE LOAD AND STABILITY Follower configurations with load capacitance in excess of 30pF can produce extra overshoot (see typical characteristic Small-Signal Overshoot vs Capacitive Load, Figure 17) and ringing in the output signal. Increasing the gain enhances the ability of the amplifier to drive greater capacitive loads. 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 21. This resistor significantly reduces ringing while maintaining direct current (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. VS RS VOUT OPA379 VIN 10W to 20W RL CL Figure 21. Series Resistor in Unity-Gain Buffer Configuration Improves Capacitive Load Drive Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 Submit Documentation Feedback 9 OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com In unity-gain inverter configuration, phase margin can be reduced by the reaction between the capacitance at the op amp input and the gain setting resistors. Best performance is achieved by using smaller valued resistors. However, when large valued resistors cannot be avoided, a small (4pF to 6pF) capacitor, CFB, can be inserted in the feedback, as shown in Figure 22. This configuration significantly reduces overshoot by compensating the effect of capacitance, CIN, which includes the amplifier input capacitance (3pf) and printed circuit board (PC) parasitic capacitance. CFB RF RIN VIN OPA379 VOUT CIN RF = = VREF 1000(IBMAX) 1.2V 1000(100pA) = 12MW » 10MW (1) 2. Choose the hysteresis voltage, VHYST. For battery monitoring applications, 50mV is adequate. 3. Calculate R1 as follows: VHYST 50mW R 1 = RF = 10MW = 210kW VBATT 2.4V (2) 4. Select a threshold voltage for VIN rising (VTHRS) = 2.0V 5. Calculate R2 as follows: 1 R2 = VTHRS 1 1 R1 RF VREF ´ R1 1 = 1 2V 1 10MW 1.2V ´ 210kW 210kW Figure 22. Improving Stability for Large RF and RIN BATTERY MONITORING = 325kW The low operating voltage and quiescent current of the OPA379 series make it an excellent choice for battery monitoring applications, as shown in Figure 23. In this circuit, VSTATUS is high as long as the battery voltage remains above 2V. A low-power reference is used to set the trip point. Resistor values are selected as follows: 1. RF Selecting: Select RF such that the current through RF is approximately 1000x larger than the maximum bias current over temperature: (3) 6. Calculate RBIAS: The minimum supply voltage for this circuit is 1.8V. The REF1112 has a current requirement of 1.2µA (max). Providing 2µA of supply current assures proper operation. Therefore: (VBATTMIN - VREF) (1.8V - 1.2V) = = 0.3MW RBIAS = IBIAS 2 mA (4) RF R1 +IN + IBIAS VBATT OPA379 RBIAS OUT VSTATUS -IN VREF R2 REF1112 Figure 23. Battery Monitor 10 Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 WINDOW COMPARATOR The window comparator threshold voltages are set as follows: R2 ´ VS VH = R 1 + R2 (5) R4 ´ VS VL = R 3 + R4 (6) Figure 24 shows the OPA2379 used as a window comparator. The threshold limits are set by VH and VL, with VH > VL. When VIN < VH, the output of A1 is low. When VIN > VL, the output of A2 is low. Therefore, both op amp outputs are at 0V as long as VIN is between VH and VL. This architecture results in no current flowing through either diode, Q1 in cutoff, with the base voltage at 0V, and VOUT forced high. If VIN falls below VL, the output of A2 is high, current flows through D2, and VOUT is low. Likewise, if VIN rises above VH, the output of A1 is high, current flows through D1, and VOUT is low. VS VS R1 VH A1 1/2 OPA2379 R2 D1 (2) VS R7 5.1kW RIN VOUT R5 10kW (1) 2kW VIN (3) Q1 R6 5.1kW VS VS A2 R3 VL 1/2 OPA2379 D2 (2) R4 (1) RIN protects A1 and A2 from possible excess current flow. (2) IN4446 or equivalent diodes. (3) 2N2222 or equivalent NPN transistor. Figure 24. OPA2379 as a Window Comparator Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 Submit Documentation Feedback 11 OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com ADDITIONAL APPLICATION EXAMPLES Figure 25 through Figure 29 illustrate additional application examples. +2.7V R3 R2 VCC +2.7V MSP430x20x3PW R1 66.5W A0+ 16-Bit ADC OPA379 C1 1.5nF VIN VREF REF3312 VSS C2 1m F Figure 25. Unipolar Signal Chain Configuration VEX R1 VS R R R R VOUT OPA379 R1 VREF Figure 26. Single Op Amp Bridge Amplifier +5V REF3130 3V Load R1 4.99kW R2 49.9kW R6 71.5kW V ILOAD RSHUNT 1W RN 56W OPA379 R3 4.99kW Stray Ground-Loop Resistance R4 48.7kW ADS1100 R7 1.18kW RN 56W 2 IC (PGA Gain = 4) FS = 3.0V NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors. Figure 27. Low-Side Current Monitor 12 Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 RG zener RSHUNT (1) V+ (2) R1 10kW MOSFET rated to stand-off supply voltage such as BSS84 for up to 50V. OPA379 V+5V Two zener biasing methods (3) are shown. Output Load RBIAS RL (1) Zener rated for op amp supply capability (that is, 5.1V for OPA379). (2) Current-limiting resistor. (3) Choose zener biasing resistor or dual NMOSMETs (FDG6301N, NTJD4001N, or Si1034). Figure 28. High-Side Current Monitor RG VREF R1 R2 R2 1/2 OPA2379 V2 R1 VOUT 1/2 OPA2379 V1 VOUT = (V1 - V2) 1 + R1 2R1 + + VREF R2 RG Figure 29. Two Op Amp Instrumentation Amplifier Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 Submit Documentation Feedback 13 PACKAGE OPTION ADDENDUM www.ti.com 14-Oct-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) OPA2379AID ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 2379A Samples OPA2379AIDCNR ACTIVE SOT-23 DCN 8 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 BPK Samples OPA2379AIDCNT ACTIVE SOT-23 DCN 8 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 BPK Samples OPA2379AIDG4 ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 2379A Samples OPA2379AIDR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 2379A Samples OPA379AID ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 OPA 379A Samples OPA379AIDBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 B53 Samples OPA379AIDBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 B53 Samples OPA379AIDBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 B53 Samples OPA379AIDCKR ACTIVE SC70 DCK 5 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 B54 Samples OPA379AIDCKT ACTIVE SC70 DCK 5 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 B54 Samples OPA379AIDCKTG4 ACTIVE SC70 DCK 5 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 B54 Samples OPA379AIDR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 OPA 379A Samples OPA379AIDRG4 ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 OPA 379A Samples OPA4379AIPWR ACTIVE TSSOP PW 14 2000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 125 4379A Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 14-Oct-2022 (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of