OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 High-Precision, Low-Noise, Rail-to-Rail Output, 11MHz JFET Op Amp Check for Samples: OPA140, OPA2140, OPA4140 FEATURES DESCRIPTION • • • • • • • • • • • • • The OPA140, OPA2140, and OPA4140 op amp family is a series of low-power JFET input amplifiers that feature good drift and low input bias current. The rail-to-rail output swing and input range that includes V– allow designers to take advantage of the low-noise characteristics of JFET amplifiers while also interfacing to modern, single-supply, precision analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). 1 2 Very Low Offset Drift: 1mV/°C max Very Low Offset: 120mV Low Input Bias Current: 10pA max Very Low 1/f Noise: 250nVPP, 0.1Hz to 10Hz Low Noise: 5.1nV/√Hz Slew Rate: 20V/ms Low Supply Current: 2.0mA max Input Voltage Range Includes V– Supply Single-Supply Operation: 4.5V to 36V Dual-Supply Operation: ±2.25V to ±18V No Phase Reversal Industry-Standard SO Packages MSOP-8, TSSOP, and SOT23 Packages APPLICATIONS • • • • • • • Battery-Powered Instruments Industrial Controls Medical Instrumentation Photodiode Amplifiers Active Filters Data Acquisition Systems Automatic Test Systems 0.1Hz to 10Hz NOISE VSUPPLY = ±18V Competitor’s Device 200nV/div OPAx140 The OPA140 achieves 11MHz unity-gain bandwidth and 20V/ms slew rate while consuming only 1.8mA (typ) of quiescent current. It runs on a single 4.5 to 36V supply or dual ±2.25V to ±18V supplies. All versions are fully specified from –40°C to +125°C for use in the most challenging environments. The OPA140 (single) is available in the SOT23-5, MSOP-8, and SO-8 packages; the OPA2140 (dual) is available in both MSOP-8 and SO-8 packages; and the OPA4140 (quad) is available in the SO-14 and TSSOP-14 packages. RELATED PRODUCTS FEATURES PRODUCT Low-Power, 10MHz FET Input Industrial Op Amp OPA141 2.2nV/√Hz, Low-Power, 36V Operational Amplifier in SOT23 Package OPA209 Low-Noise, High-Precision, 22MHz, 4nV/√Hz JFET-Input Operational Amplifier OPA827 Low-Noise, Low IQ Precision CMOS Operational Amplifier OPA376 High-Speed, FET-Input Operational Amplifier OPA132 Time (1s/div) 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 © 2010, Texas Instruments Incorporated OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 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). VALUE UNIT ±20 V Supply Voltage Signal Input Terminals Voltage (2) (V–) –0.5 to (V+) +0.5 V Current (2) ±10 mA Output Short-Circuit (3) Continuous Operating Temperature, TA –55 to +150 °C Storage Temperature, TA –65 to +150 °C Junction Temperature, TJ ESD Ratings (1) (2) (3) +150 °C Human Body Model (HBM) 2000 V Charged Device Model (CDM) 500 V 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 10 mA or less. Short-circuit to VS/2 (ground in symmetrical dual-supply setups), one amplifier per package. PACKAGE INFORMATION (1) PRODUCT OPA140 OPA2140 OPA4140 (1) 2 PACKAGE-LEAD PACKAGE DESIGNATOR PACKAGE MARKING SO-8 D OPA140 MSOP-8 DGK 140 SOT23-5 DBV O140 SO-8 D O2140A MSOP-8 DGK 2140 TSSOP-14 PW O4140A SO-14 D O4140A For the most current package and ordering information see the Package Option Addendum at the end of this document, or visit the device product folder at www.ti.com. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 ELECTRICAL CHARACTERISTICS: VS = +4.5V to +36V; ±2.25V to ±18V Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. OPA140, OPA2140, OPA4140 PARAMETER CONDITIONS MIN TYP MAX UNIT 30 120 mV OFFSET VOLTAGE Offset Voltage, RTI VOS Over Temperature Drift vs Power Supply VS = ±18V VS = ±18V dVOS/dT PSRR xxxOver Temperature 220 mV VS = ±18V ±0.35 1.0 mV/°C VS = ±2.25V to ±18V ±0.1 ±0.5 mV/V ±4 mV/V VS = ±2.25V to ±18V INPUT BIAS CURRENT (1) Input Bias Current IB ±0.5 ±10 pA ±3 nA IOS ±0.5 ±10 pA ±1 nA Over Temperature Input Offset Current Over Temperature NOISE Input Voltage Noise f = 0.1Hz to 10Hz 250 nVPP f = 0.1Hz to 10Hz 42 nVRMS f = 10Hz 8 nV/√Hz f = 100Hz 5.8 nV/√Hz 5.1 nV/√Hz 0.8 fA/√Hz Input Voltage Noise Density en f = 1kHz Input Current Noise Density In f = 1kHz INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection Ratio VCM CMRR Over Temperature (V–) –0.1 VS = ±18V, VCM = (V–) –0.1V to (V+) – 3.5V 126 VS = ±18V, VCM = (V–) –0.1V to (V+) – 3.5V 120 (V+)–3.5 140 V dB dB INPUT IMPEDANCE Differential Common-Mode VCM = (V–) –0.1V to (V+) –3.5V 1013 || 10 Ω || pF 1013 || 7 Ω || pF dB OPEN-LOOP GAIN Open-Loop Voltage Gain AOL Over Temperature VO = (V–)+0.35V to (V+)–0.35V, RL = 10kΩ 120 126 VO = (V–)+0.35V to (V+)–0.35V, RL = 2kΩ 114 126 VO = (V–)+0.35V to (V+)–0.35V, RL = 2kΩ 108 dB dB FREQUENCY RESPONSE Gain Bandwidth Product 11 MHz Slew Rate BW 20 V/ms Settling Time, 12-bit (0.024) 880 ns Settling Time, 16-bit 1.6 ms THD+N 1kHz, G = 1, VO = 3.5VRMS Overload Recovery Time (1) 0.00005 % 600 ns High-speed test, TA = TJ. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 3 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS = +4.5V to +36V; ±2.25V to ±18V (continued) Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. OPA140, OPA2140, OPA4140 PARAMETER CONDITIONS MIN TYP MAX UNIT V OUTPUT Voltage Output VO Short-Circuit Current ISC Capacitive Load Drive RL = 10kΩ, AOL ≥ 108dB (V–)+0.2 (V+)–0.2 RL = 2kΩ, AOL ≥ 108dB (V–)+0.35 (V+)–0.35 +36 mA Sink –30 mA CLOAD Open-Loop Output Impedance V Source See Figure 20 and Figure 21 RO f = 1MHz, IO = 0 (See Figure 19) Ω 16 POWER SUPPLY Specified Voltage Range VS Quiescent Current (per amplifier) ±2.25 IQ IO = 0mA ±18 V 2.0 mA 2.7 mA 1.8 Over Temperature CHANNEL SEPARATION Channel Separation At dc 0.02 mV/V At 100kHz 10 mV/V TEMPERATURE RANGE Specified Range –40 +125 °C Operating Range –55 +150 °C THERMAL INFORMATION THERMAL METRIC OPA140, OPA2140 OPA140, OPA2140 OPA140 D (SO) DGK (MSOP) DBV (SOT23) (1) 8 8 5 qJA Junction-to-ambient thermal resistance 160 180 210 qJC(top) Junction-to-case(top) thermal resistance 75 55 200 qJB Junction-to-board thermal resistance 60 130 110 yJT Junction-to-top characterization parameter 9 n/a 40 yJB Junction-to-board characterization parameter 50 120 105 qJC(bottom) Junction-to-case(bottom) thermal resistance n/a n/a n/a (1) UNITS °C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. THERMAL INFORMATION THERMAL METRIC (1) OPA4140 OPA4140 D (SO) PW (TSSOP) 14 14 qJA Junction-to-ambient thermal resistance 97 135 qJC(top) Junction-to-case(top) thermal resistance 56 45 qJB Junction-to-board thermal resistance 53 66 yJT Junction-to-top characterization parameter 19 n/a yJB Junction-to-board characterization parameter 46 60 qJC(bottom) Junction-to-case(bottom) thermal resistance n/a n/a (1) 4 UNITS °C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 PIN ASSIGNMENTS OPA140 SO-8, MSOP-8 (TOP VIEW) NC (1) OPA2140 SO-8, MSOP-8 (TOP VIEW) (1) 1 8 NC -In 2 7 V+ +In 3 6 Out V- 4 5 NC OUT A 1 -In A 2 +In A 3 V- 4 V- 2 +IN 3 V+ 5 4 7 Out B 6 -In B 5 +In B OPA4140 SO-14, TSSOP-14 (TOP VIEW) OPA140 SOT23-5 (TOP VIEW) 1 B V+ (1) (1) NC denotes no internal connection. OUT A 8 Out A 1 -In A 2 A 14 Out D 13 -In D D +In A 3 12 +In D V+ 4 11 V- + In B 5 10 + In C -IN B C -In B 6 9 -In C Out B 7 8 Out C SIMPLIFIED BLOCK DIAGRAM V+ Pre-Output Driver IN- OUT IN+ V- Figure 1. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 5 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com TYPICAL CHARACTERISTICS SUMMARY TABLE OF GRAPHS Table 1. Characteristic Performance Measurements DESCRIPTION FIGURE Offset Voltage Production Distribution Figure 2 Offset Voltage Drift Distribution Figure 3 Offset Voltage vs Common-Mode Voltage (Max Supply) Figure 4 IB vs Common-Mode Voltage Figure 6 Input Offset Voltage vs Temperature Figure 5 Output Voltage Swing vs Output Current Figure 7 CMRR and PSRR vs Frequency (RTI) Figure 8 Common-Mode Rejection Ratio vs Temperature Figure 9 0.1Hz to 10Hz Noise Figure 10 Input Voltage Noise Density vs Frequency Figure 11 THD+N Ratio vs Frequency (80kHz AP Bandwidth) Figure 12 THD+N Ratio vs Output Amplitude Figure 13 Quiescent Current vs Temperature Figure 14 Quiescent Current vs Supply Voltage Figure 15 Gain and Phase vs Frequency Figure 16 Closed-Loop Gain vs Frequency Figure 17 Open-Loop Gain vs Temperature Figure 18 Open-Loop Output Impedance vs Frequency Figure 19 Small-Signal Overshoot vs Capacitive Load (G = +1) Figure 20 Small-Signal Overshoot vs Capacitive Load (G = –1) Figure 21 No Phase Reversal Figure 22 Positive Overload Recovery Figure 24 Negative Overload Recovery Figure 25 Large-Signal Positive and Negative Settling Time 6 Figure 26, Figure 27 Small-Signal Step Response (G = +1) Figure 28 Small-Signal Step Response (G = –1) Figure 29 Large-Signal Step Response (G = +1) Figure 30 Large-Signal Step Response (G = –1) Figure 31 Short-Circuit Current vs Temperature Figure 32 Maximum Output Voltage vs Frequency Figure 23 Channel Separation vs Frequency Figure 33 Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 TYPICAL CHARACTERISTICS At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. OFFSET VOLTAGE DRIFT DISTRIBUTION -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 Population Population OFFSET VOLTAGE PRODUCTION DISTRIBUTION Offset Voltage (mV) Offset Voltage Drift (mV/°C) Figure 2. Figure 3. OFFSET VOLTAGE vs COMMON-MODE VOLTAGE INPUT OFFSET VOLTAGE vs TEMPERATURE (144 Amplifiers) 160 18 Typical Units Shown 120 80 60 40 20 0 -20 -40 -60 -80 -100 -120 Input Offset Voltage (mV) VOS (mV) 120 100 80 40 0 -40 -80 -120 -160 -18 -12 0 -6 6 12 18 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (?C) VCM (V) Figure 4. Figure 5. IB vs COMMON-MODE VOLTAGE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT (MAX SUPPLY) 18.0 10 17.5 +14.5V Output Voltage (V) -0.1V IB (pA) 17.0 Specified Common-Mode Voltage Range 8 6 4 +IB 2 0 16.5 16.0 -40°C +25°C +85°C +125°C -16.0 -16.5 -17.0 -17.5 -IB -18 -15 -12 -9 -18.0 -6 -3 0 3 6 9 12 15 18 0 10 20 30 40 50 60 70 Output Current (mA) VCM (V) Figure 6. Figure 7. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 7 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. CMRR AND PSRR vs FREQUENCY (Referred to Input) COMMON-MODE REJECTION RATIO vs TEMPERATURE 0.12 CMRR 160 0.10 140 120 CMRR (mV/V) Common-Mode Rejection Ratio (dB) Power-Supply Rejection Ratio (dB) 180 100 -PSRR 80 +PSRR 60 0.08 0.06 0.04 40 0.02 20 0 0 1 10 100 1k 10k 100k 1M 10M 100M -75 -50 0 -25 Frequency (Hz) 25 75 50 100 125 150 Temperature (°C) Figure 8. Figure 9. 0.1Hz to 10Hz NOISE INPUT VOLTAGE NOISE DENSITY vs FREQUENCY 100nV/div Voltage Noise Density (nV/ÖHz) 100 10 1 Time (1s/div) 0.1 1 10 100 1k 10k 100k Frequency (Hz) Figure 10. Figure 11. THD+N RATIO vs FREQUENCY G = -1 0.0001 -120 G = +1 0.00001 -140 10 100 1k 10k 20k Total Harmonic Distortion + Noise (%) VOUT = 3VRMS BW = 80kHz RL = 2kW 0.01 BW = 80kHz 1kHz Signal RL = 2kW G = -1 G = +1 0.001 -100 0.0001 -120 0.00001 NOTE: Increase at low signal levels is a result of increased % contribution of noise. 0.1 1 10 -140 100 Frequency (Hz) Frequency (Hz) Figure 12. 8 -80 Total Harmonic Distortion + Noise (dB) Total Harmonic Distortion + Noise (%) THD+N RATIO vs OUTPUT AMPLITUDE -100 Total Harmonic Distortion + Noise (dB) 0.001 Figure 13. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. QUIESCENT CURRENT vs TEMPERATURE QUIESCENT CURRENT vs SUPPLY VOLTAGE 2.5 2.00 OPA140 1.75 2.0 1.50 1.25 IQ (mA) IQ (mA) 1.5 1.0 1.00 0.75 0.50 0.5 0.25 0 Specified Supply-Voltage Range 0 -75 -50 0 -25 25 75 50 100 125 150 0 4 8 12 Temperature (°C) Figure 14. 20 24 28 32 36 Figure 15. GAIN AND PHASE vs FREQUENCY CLOSED-LOOP GAIN vs FREQUENCY 140 180 40 120 CL = 30pF 30 G = +10 Gain 135 90 60 40 Phase Phase (degrees) 80 20 Gain (dB) 100 Gain (dB) 16 Supply Voltage (V) 45 20 10 G = +1 0 -10 -20 G = -1 0 -30 0 100M -20 10 100 1k 10k 100k 1M 10M -40 100k 1M Frequency (Hz) 10M 100M Frequency (Hz) Figure 16. Figure 17. OPEN-LOOP GAIN vs TEMPERATURE OPEN-LOOP OUTPUT IMPEDANCE vs FREQUENCY 1k 0 10kW Load -0.2 100 -0.6 ZO (W) AOL (mV/V) -0.4 2kW Load -0.8 10 -1.0 -1.2 1 -1.4 -75 -50 -25 0 25 75 50 100 125 150 10 100 1k Temperature (°C) Figure 18. 10k 100k 1M 10M 100M Frequency (Hz) Figure 19. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 9 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. SMALL-SIGNAL OVERSHOOT vs CAPACITIVE LOAD (100mV Output Step) 40 SMALL-SIGNAL OVERSHOOT vs CAPACITIVE LOAD (100mV Output Step) 50 ROUT = 0W G = +1 +15V 35 45 ROUT OPA140 25 ROUT = 0W 40 RL -15V ROUT = 24W CL Overshoot (%) Overshoot (%) 30 ROUT = 24W 20 15 35 30 25 20 ROUT = 51W 15 10 RI = 2kW RF = 2kW G = -1 +15V 10 ROUT = 51W 5 ROUT OPA140 CL 5 0 -15V 0 0 200 400 600 800 1000 1200 1400 1600 0 500 1000 1500 Capacitive Load (pF) Capacitive Load (pF) Figure 20. Figure 21. NO PHASE REVERSAL 2000 MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 35 Maximum output voltage range without slew-rate induced distortion VS = ±15V 30 Output Voltage (VPP) 5V/div Output +18V OPA140 Output 25 20 15 VS = ±5V 10 -18V 37VPP Sine Wave (±18.5V) VS = ±2.25V 5 0 Time (0.4ms/div) 10k 100k 1M 10M Frequency (Hz) Figure 22. Figure 23. POSITIVE OVERLOAD RECOVERY NEGATIVE OVERLOAD RECOVERY VOUT 5V/div 5V/div VIN 20kW 20kW 2kW VIN 2kW OPA140 VOUT OPA140 VIN G = -10 G = -10 Time (0.4ms/div) Time (0.4ms/div) Figure 24. 10 VOUT VIN VOUT Figure 25. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. LARGE-SIGNAL NEGATIVE SETTLING TIME (10V Step) 1000 1000 800 800 600 400 16-bit Settling 200 0 -200 (±1/2LSB = ±0.00075%) -400 -600 Delta from Final Value (mV) Delta from Final Value (mV) LARGE-SIGNAL POSITIVE SETTLING TIME (10V Step) 600 400 0 -200 -600 -800 -1000 -1000 0.5 1 1.5 2 2.5 3 3.5 (±1/2LSB = ±0.00075%) -400 -800 0 16-bit Settling 200 4 0 0.5 1 1.5 2 2.5 3 Time (ms) Time (ms) Figure 26. Figure 27. SMALL-SIGNAL STEP RESPONSE (100mV) SMALL-SIGNAL STEP RESPONSE (100mV) G = +1 +15V OPA140 -15V RL 4 CL = 100pF 10mV/div 10mV/div CL = 100pF 3.5 RI = 2kW RF = 2kW +15V OPA140 CL CL -15V G = -1 Time (100ns/div) Time (100ns/div) Figure 28. Figure 29. LARGE-SIGNAL STEP RESPONSE LARGE-SIGNAL STEP RESPONSE G = +1 CL = 100pF 2V/div 2V/div G = -1 CL = 100pF Time (400ns/div) Time (400ns/div) Figure 30. Figure 31. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 11 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted. SHORT-CIRCUIT CURRENT vs TEMPERATURE CHANNEL SEPARATION vs FREQUENCY 60 -90 ISC, Source ISC, Sink Channel Separation (dB) 50 ISC (mA) 40 30 20 10 -100 VOUT = 3VRMS G = +1 -110 RL = 2kW -120 -130 -140 Short-circuiting causes thermal shutdown; see Applications Information section. RL = 5kW 0 -150 -75 -50 -25 0 25 75 50 100 125 150 10 100 Temperature (°C) Figure 32. 12 1k 10k 100k Frequency (Hz) Figure 33. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 APPLICATION INFORMATION OPERATING VOLTAGE The OPA140, OPA2140, and OPA4140 series of op amps can be used with single or dual supplies from an operating range of VS = +4.5V (±2.25V) and up to VS = +36V (±18V). These devices do not require symmetrical supplies; they only require a minimum supply voltage of +4.5V (±2.25V). For VS less than ±3.5V, the common-mode input range does not include midsupply. Supply voltages higher than +40V can permanently damage the device; see the Absolute Maximum Ratings table. Key parameters are specified over the operating temperature range, TA = –40°C to +125°C. Key parameters that vary over the supply voltage or temperature range are shown in the Typical Characteristics section of this data sheet. CAPACITIVE LOAD AND STABILITY The dynamic characteristics of the OPAx140 have been optimized for commonly encountered gains, loads, and operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (ROUT equal to 50Ω, for example) in series with the output. Figure 20 and Figure 21 illustrate graphs of Small-Signal Overshoot vs Capacitive Load for several values of ROUT. Also, refer to Applications Bulletin AB-028 (literature number SBOA015, available for download from the TI web site) for details of analysis techniques and application circuits. with total circuit noise calculated. The op amp itself contributes both a voltage noise component and a current noise component. The voltage noise is commonly modeled as a time-varying component of the offset voltage. The current noise is modeled as the time-varying component of the input bias current and reacts with the source resistance to create a voltage component of noise. Therefore, the lowest noise op amp for a given application depends on the source impedance. For low source impedance, current noise is negligible, and voltage noise generally dominates. The OPA140, OPA2140, and OPA4140 family has both low voltage noise and extremely low current noise because of the FET input of the op amp. As a result, the current noise contribution of the OPAx140 series is negligible for any practical source impedance, which makes it the better choice for applications with high source impedance. The equation in Figure 34 shows the calculation of the total circuit noise, with these parameters: • en = voltage noise • In = current noise • RS = source impedance • k = Boltzmann's constant = 1.38 × 10–23 J/K • T = temperature in degrees Kelvin (K) For more details on calculating noise, see the section on Basic Noise Calculations. 10k Votlage Noise Spectral Density, EO The OPA140, OPA2140, and OPA4140 are unity-gain stable, operational amplifiers with very low noise, input bias current, and input offset voltage. Applications with noisy or high-impedance power supplies require decoupling capacitors placed close to the device pins. In most cases, 0.1mF capacitors are adequate. Figure 1 shows a simplified schematic of the OPA140. EO OPA211 1k RS 100 OPA140 Resistor Noise 10 2 2 2 EO = en + (in RS) + 4kTRS 1 100 1k 10k 100k 1M Source Resistance, RS (W) NOISE PERFORMANCE Figure 34 shows the total circuit noise for varying source impedances with the operational amplifier in a unity-gain configuration (with no feedback resistor network and therefore no additional noise contributions). The OPA140 and OPA211 are shown Figure 34. Noise Performance of the OPA140 and OPA211 in Unity-Gain Buffer Configuration Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 13 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com BASIC NOISE CALCULATIONS Figure 35 illustrates both noninverting (A) and inverting (B) op amp circuit configurations with gain. In circuit configurations with gain, the feedback network resistors also contribute noise. In general, the current noise of the op amp reacts with the feedback resistors to create additional noise components. However, the extremely low current noise of the OPAx140 means that its current noise contribution can be neglected. Low-noise circuit design requires careful analysis of all noise sources. External noise sources can dominate in many cases; consider the effect of source resistance on overall op amp noise performance. Total noise of the circuit is the root-sum-square combination of all noise components. The resistive portion of the source impedance produces thermal noise proportional to the square root of the resistance. This function is plotted in Figure 34. The source impedance is usually fixed; consequently, select the op amp and the feedback resistors to minimize the respective contributions to the total noise. A) Noise in Noninverting Gain Configuration The feedback resistor values can generally be chosen to make these noise sources negligible. Note that low impedance feedback resistors load the output of the amplifier. The equations for total noise are shown for both configurations. space Noise at the output: R2 2 R2 EO2 = 1 + R1 R1 2 en2 + R2 2 e12 + e22 + 1 + R1 R2 R1 es2 EO RS Where eS = 4kTRS = thermal noise of RS e1 = 4kTR1 = thermal noise of R1 e2 = 4kTR2 = thermal noise of R2 VS B) Noise in Inverting Gain Configuration Noise at the output: R2 2 R2 2 EO = 1 + R1 RS VS R1 + RS e n2 + 2 R2 R 1 + RS e12 + e22 + 2 R2 R 1 + RS e s2 EO Where eS = 4kTRS = thermal noise of RS e1 = 4kTR1 = thermal noise of R1 e2 = 4kTR2 = thermal noise of R2 For the OPAx140 series of operational amplifiers at 1kHz, en = 5.1nV/√Hz. Figure 35. Noise Calculation in Gain Configurations 14 Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 PHASE-REVERSAL PROTECTION The OPA140, OPA2140, and OPA4140 family has internal phase-reversal protection. Many FET- and bipolar-input op amps exhibit a phase reversal when the input is driven beyond its linear common-mode range. This condition is most often encountered in noninverting circuits when the input is driven beyond the specified common-mode voltage range, causing the output to reverse into the opposite rail. The input circuitry of the OPA140, OPA2140, and OPA4140 prevents phase reversal with excessive common-mode voltage; instead, the output limits into the appropriate rail (see Figure 22). OUTPUT CURRENT LIMIT The output current of the OPAx140 series is limited by internal circuitry to +36mA/–30mA (sourcing/sinking), to protect the device if the output is accidentally shorted. This short-circuit current depends on temperature, as shown in Figure 32. POWER DISSIPATION AND THERMAL PROTECTION The OPAx140 series of op amps are capable of driving 2kΩ loads with power-supply voltages of up to ±18V over the specified temperature range. In a single-supply configuration, where the load is connected to the negative supply voltage, the minimum load resistance is 2.8kΩ at a supply voltage of +36V. For lower supply voltages (either single-supply or symmetrical supplies), a lower load resistance may be used, as long as the output current does not exceed 13mA; otherwise, the device short-circuit current protection circuit may activate. Internal power dissipation increases when operating at high supply voltages. Copper leadframe construction used in the OPA140, OPA2140, and OPA4140 series devices improves heat dissipation compared to conventional materials. Printed circuit board (PCB) layout can also help reduce a possible increase in junction temperature. Wide copper traces help dissipate the heat by acting as an additional heatsink. Temperature rise can be further minimized by soldering the devices directly to the PCB rather than using a socket. Although the output current is limited by internal protection circuitry, accidental shorting of one or more output channels of a device can result in excessive heating. For instance, when an output is shorted to mid-supply, the typical short-circuit current of 36mA leads to an internal power dissipation of over 600mW at a supply of ±18V. In the case of a dual OPA2140 in an MSOP-8 package (thermal resistance qJA = 180°C/W), such power dissipation would lead the die temperature to be 220°C above ambient temperature, when both channels are shorted. This temperature increase significantly decreases the operating life of the device. In order to prevent excessive heating, the OPAx140 series has an internal thermal shutdown circuit, which shuts down the device if the die temperature exceeds approximately +180°C. Once this thermal shutdown circuit activates, a built-in hysteresis of 15°C ensures that the die temperature must drop to approximately +165°C before the device switches on again. Additional consideration should be given to the combination of maximum operating voltage, maximum operating temperature, load, and package type. Figure 36 and Figure 37 show several practical considerations when evaluating the OPA2140 (dual version) and the OPA4140 (quad version). As an example, the OPA4140 has a maximum total quiescent current of 10.8mA (2.7mA/channel) over temperature. The TSSOP-14 package has a typical thermal resistance of 135°C/W. This parameter means that because the junction temperature should not exceed +150°C in order to ensure reliable operation, either the supply voltage must be reduced, or the ambient temperature should remain low enough so that the junction temperature does not exceed +150°C. This condition is illustrated in Figure 36 for various package types. Moreover, resistive loading of the output causes additional power dissipation and thus self-heating, which also must be considered when establishing the maximum supply voltage or operating temperature. To this end, Figure 37 shows the maximum supply voltage versus temperature for a worst-case dc load resistance of 2kΩ. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 15 OPA140 OPA2140, OPA4140 SBOS498A – JULY 2010 – REVISED AUGUST 2010 www.ti.com particular semiconductor fabrication process and specific circuits connected to the pin. Additionally, internal electrostatic discharge (ESD) protection is built into these circuits to protect them from accidental ESD events both before and during product assembly. MAXIMUM SUPPLY VOLTAGE (Quiescent Condition) 20 Maximum Supply Voltage (V) 18 16 14 12 10 8 6 TSSOP Quad SOIC Quad MSOP Dual SOIC Dual 4 2 0 80 90 100 110 120 130 140 150 160 Ambient Temperature (?C) Figure 36. Maximum Supply Voltage vs Temperature (OPA2140 and OPA4140), Quiescent Condition MAXIMUM SUPPLY VOLTAGE (Maximum DC Load on All Channels) 20 Maximum Supply Voltage (V) 18 16 14 12 10 8 6 TSSOP Quad SOIC Quad MSOP Dual SOIC Dual 4 2 0 80 90 100 110 120 130 140 150 160 Ambient Temperature (?C) Figure 37. Maximum Supply Voltage vs Temperature (OPA2140 and OPA4140), Maximum DC Load ELECTRICAL OVERSTRESS Designers often ask questions about the capability of an operational amplifier to withstand electrical overstress. These questions tend to focus on the device inputs, but may involve the supply voltage pins or even the output pin. Each of these different pin functions have electrical stress limits determined by the voltage breakdown characteristics of the 16 It is helpful to have a good understanding of this basic ESD circuitry and its relevance to an electrical overstress event. See Figure 38 for an illustration of the ESD circuits contained in the OPAx140 series (indicated by the dashed line area). The ESD protection circuitry involves several current-steering diodes connected from the input and output pins and routed back to the internal power-supply lines, where they meet at an absorption device internal to the operational amplifier. This protection circuitry is intended to remain inactive during normal circuit operation. An ESD event produces a short duration, high-voltage pulse that is transformed into a short duration, high-current pulse as it discharges through a semiconductor device. The ESD protection circuits are designed to provide a current path around the operational amplifier core to prevent it from being damaged. The energy absorbed by the protection circuitry is then dissipated as heat. When an ESD voltage develops across two or more of the amplifier device pins, current flows through one or more of the steering diodes. Depending on the path that the current takes, the absorption device may activate. The absorption device has a trigger, or threshold voltage, that is above the normal operating voltage of the OPAx140 but below the device breakdown voltage level. Once this threshold is exceeded, the absorption device quickly activates and clamps the voltage across the supply rails to a safe level. When the operational amplifier connects into a circuit such as the one Figure 38 shows, the ESD protection components are intended to remain inactive and not become involved in the application circuit operation. However, circumstances may arise where an applied voltage exceeds the operating voltage range of a given pin. Should this condition occur, there is a risk that some of the internal ESD protection circuits may be biased on, and conduct current. Any such current flow occurs through steering diode paths and rarely involves the absorption device. Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 OPA140 OPA2140, OPA4140 www.ti.com SBOS498A – JULY 2010 – REVISED AUGUST 2010 Figure 38 depicts a specific example where the input voltage, VIN, exceeds the positive supply voltage (+VS) by 500mV or more. Much of what happens in the circuit depends on the supply characteristics. If +VS can sink the current, one of the upper input steering diodes conducts and directs current to +VS. Excessively high current levels can flow with increasingly higher VIN. As a result, the datasheet specifications recommend that applications limit the input current to 10mA. Again, it depends on the supply characteristic while at 0V, or at a level below the input signal amplitude. If the supplies appear as high impedance, then the operational amplifier supply current may be supplied by the input source via the current steering diodes. This state is not a normal bias condition; the amplifier most likely will not operate normally. If the supplies are low impedance, then the current through the steering diodes can become quite high. The current level depends on the ability of the input source to deliver current, and any resistance in the input path. If the supply is not capable of sinking the current, VIN may begin sourcing current to the operational amplifier, and then take over as the source of positive supply voltage. The danger in this case is that the voltage can rise to levels that exceed the operational amplifier absolute maximum ratings. If there is an uncertainty about the ability of the supply to absorb this current, external zener diodes may be added to the supply pins as shown in Figure 38. The zener voltage must be selected such that the diode does not turn on during normal operation. Another common question involves what happens to the amplifier if an input signal is applied to the input while the power supplies +VS and/or –VS are at 0V. However, its zener voltage should be low enough so that the zener diode conducts if the supply pin begins to rise above the safe operating supply voltage level. (2) TVS RF +VS +V OPA140 RI ESD CurrentSteering Diodes -In (3) RS +In Op Amp Core Edge-Triggered ESD Absorption Circuit ID VIN Out RL (1) -V -VS (2) TVS (1) VIN = +VS + 500mV. (2) TVS: +VS(max) > VTVSBR (Min) > +VS (3) Suggested value approximately 1kΩ. Figure 38. Equivalent Internal ESD Circuitry and Its Relation to a Typical Circuit Application Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): OPA140 OPA2140 OPA4140 17 PACKAGE OPTION ADDENDUM www.ti.com 11-Oct-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) OPA140AID PREVIEW SOIC D 8 75 TBD Call TI Call TI Samples Not Available OPA140AIDBVR PREVIEW SOT-23 DBV 5 3000 TBD Call TI Call TI Samples Not Available OPA140AIDBVT PREVIEW SOT-23 DBV 5 250 TBD Call TI Call TI Samples Not Available OPA140AIDGKT PREVIEW MSOP DGK 8 250 TBD Call TI Call TI Samples Not Available OPA140AIDR PREVIEW SOIC D 8 2500 TBD Call TI Call TI Samples Not Available OPA140IDGKR PREVIEW MSOP DGK 8 TBD Call TI Call TI Samples Not Available OPA2140AID PREVIEW SOIC D 8 75 TBD Call TI Call TI Samples Not Available OPA2140AIDGKR ACTIVE MSOP DGK 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples OPA2140AIDGKT ACTIVE MSOP DGK 8 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples OPA2140AIDR PREVIEW SOIC D 8 2500 TBD Call TI Call TI Samples Not Available OPA4140AID PREVIEW SOIC D 14 50 TBD Call TI Call TI Samples Not Available OPA4140AIDR PREVIEW SOIC D 14 2500 TBD Call TI Call TI Samples Not Available OPA4140AIPW PREVIEW TSSOP PW 14 90 TBD Call TI Call TI Samples Not Available OPA4140AIPWR PREVIEW TSSOP PW 14 2000 TBD Call TI Call TI Samples Not Available (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. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com (3) 11-Oct-2010 MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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Addendum-Page 2 MECHANICAL DATA MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. Falls within JEDEC MO-153 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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