OP27AFKB

OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 D Replacements for ADI, PMI and LTC OP27 JG PACKAGE (TOP VIEW) Series Features of OP27A and OP27C: D Maximum Equivalent Input Noise Voltage: 3.8 nV/√Hz at 1 kHz 5.5 nV/√Hz at 10 kHz D Very Low Peak-to-Peak Noise Voltage at 0.1 Hz to 10 Hz . . . 80 nV Typ D Low Input Offset Voltage OP27A . . . 25 μV Max OP27C . . . 100 μV Max D High Voltage Amplification OP27A . . . 1 V/ μV Min OP27C . . . 0.7 V/ μV Min VIOTRIM IN − IN + VCC − 1 8 2 7 3 6 4 5 VIOTRIM VCC + OUT NC NC VIOTRIM NC VIOTRIM NC FK PACKAGE (TOP VIEW) NC 1N − NC IN + NC description 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 NC VCC + NC OUT NC NC VCC − NC NC NC The OP27 operational amplifiers combine outstanding noise performance with excellent precision and high-speed specifications. The wideband noise is only 3 nV/√Hz and with the 1/f noise corner at 2.7 Hz, low noise is maintained for all low-frequency applications. The outstanding characteristics of the OP27 make these devices excellent choices for low-noise amplifier applications requiring precision performance and reliability. The OP27 series is compensated for unity gain. 4 NC − No internal connection symbol IN + 3 + 6 IN − The OP27A and OP27C are characterized for operation over the full military temperature range of −55°C to 125°C. 2 OUT − 1 8 VIO TRIM Pin numbers are for the JG packages. AVAILABLE OPTIONS PACKAGE TA −55°C 55°C to 125°C VIOmax AT 25°C STABLE GAIN 25 μV 100 μV CERAMIC DIP (JG) CHIP CARRIER (FK) 1 OP27AJG OP27AFK 1 OP27CJG — 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. Copyright © 2010, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 Template Release Date: 7−11−94 Q3 C1 = 120 pF for OP27 † Q2A Q1B Q2B IN + Q28 Q27 Q24 Q23 Q1A Q26 Q12 C1† Q22 480 μA Q46 Q20 Q21 260 μA 750 μA Q6 340 μA 120 μA 240 μA Q45 Q11 VCC − POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IN − OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER VIO TRIM VIO TRIM VCC + Q19 OUT SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 2 schematic OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, VCC + (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V Supply voltage, VCC − (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC ± Duration of output short circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . unlimited Differential input current (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 mA Continuous power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range: OP27A, OP27C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package . . . . . . . . . . . . . . 300°C NOTES: 1. All voltage values are with respect to the midpoint between VCC + and VCC − unless otherwise noted. 2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive input current will flow if a differential input voltage in excess of approximately ±0.7 V is applied between the inputs unless some limiting resistance is used. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 85°C POWER RATING TA = 125°C POWER RATING JG FK 1050 mW 1375 mW 8.4 mW/°C 11.0 mW/°C 546 mW 715 mW 210 mW 275 mW POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 recommended operating conditions OP27A MIN NOM OP27C MAX MIN NOM MAX UNIT Supply voltage, VCC + 4 15 22 4 15 22 V Supply voltage, VCC − −4 −15 −22 −4 −15 −22 V Common mode input voltage, Common-mode voltage VIC VCC ± = ± 15 V, TA = 25°C VCC ± = ± 15 V, TA = − 55°C to 125°C Operating free-air temperature, TA ± 11 ± 11 ± 10.3 ± 10.2 −55 125 V −55 125 °C electrical characteristics at specified free-air temperature, VCC ± = ±15 V (unless otherwise noted) PARAMETER VIO Input offset voltage αVIO Average temperature coefficient of input offset voltage TA† TEST CONDITIONS VO = 0, RS = 50 Ω, VIC = 0 See Note 3 OP27A MIN 25°C See Note 4 IIO Input offset current VO = 0 0, VIC = 0 IIB Input bias current VO = 0 0, VIC = 0 Common mode input Common-mode voltage range Full range AVD Large-signal Large signal differential voltage amplification 1 0.4 2 μV/mo 7 35 12 75 50 ±10 135 ± 40 ± 15 ± 60 11 to −11 10.3 to −10.3 10.5 to −10.5 ± 11.5 1000 1800 VO = ± 10 V 800 1500 250 700 600 Common-mode input resistance ro Output resistance VO = 0, Common-mode Common mode rejection ratio 25°C 114 CMRR VIC = ± 11 V VIC = ± 10 V Full range 110 kSVR Supply voltage rejection ratio 25°C 100 Full range 96 25°C VCC ± = ± 4 V to ± 18 V VCC ± = ± 4.5 V to ± 18 V V ± 10 ± 11.5 700 V 1500 1500 200 500 V/mV 300 70 † nA ± 11.5 ± 13.5 3 IO = 0 nA 10.5 VO = ± 10 V ri(CM) ± 80 ± 150 11 to −11 RL ≥ 1 kΩ, Full range μV V 0.2 RL ≥ 2 kΩ, VO = ± 10 V 300 μV/°C ± 10 ± 11.5 RL ≥ 2 kΩ, 100 1.8 ± 12 ± 13.8 RL ≥ 0.6 kΩ, VO = ± 1 V, VCC± = ± 4 V 30 UNIT 0.4 RL ≥ 2 kΩ Full range MAX 0.6 RL ≥ 0.6 kΩ RL ≥ 2 kΩ TYP 0.2 Full range 25°C Peak output voltage swing 25 Full range 25°C VOM 10 MIN 60 25°C VICR MAX Full range Full range Long-term drift of input offset voltage OP27C TYP 126 100 2 GΩ 70 Ω 120 dB 94 120 94 86 118 dB Full range is − 55°C to 125°C. NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power. 4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 μV (see Figure 3). 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 OP27 operating characteristics, VCC ± = ±15 V, TA = 255C OP27A PARAMETER TEST CONDITIONS TYP 1.7 2.8 MAX MIN TYP 1.7 2.8 MAX SR Slew rate AVD ≥ 1, VN(PP) Peak-to-peak equivalent input noise voltage f = 0.1 Hz to 10 Hz, RS = 20 Ω, See Figure 26 0.225 0.375 0.225 0.375 f = 10 Hz, 8 3.8 8 Equivalent input noise voltage RS = 20 Ω 3.5 Vn f = 1 kHz, RS = 20 Ω 3 4 3.2 4 In Equivalent input noise current Gain-bandwidth product RL ≥ 2 kΩ MIN OP27C V/μs f = 10 Hz, See Figure 27 5 25 5 25 f = 1 kHz, See Figure 27 0.7 2.5 0.7 2.5 f = 100 kHz POST OFFICE BOX 655303 5 • DALLAS, TEXAS 75265 8 5 8 UNIT μV nV/√H nV/√Hz pA/√H pA/√Hz MHz 5 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS Table of Graphs FIGURE VIO Input offset voltage vs Temperature 1 ΔVIO Change in input offset voltage vs Time after power on vs Time (long-term drift) 2 3 IIO Input offset current vs Temperature 4 IIB Input bias current vs Temperature 5 VICR Common-mode input voltage range vs Supply voltage 6 VOM Maximum peak output voltage vs Load resistance 7 VO(PP) Maximum peak-to-peak output voltage vs Frequency 8 AVD Differential voltage amplification vs Supply voltage vs Load resistance vs Frequency CMRR Common-mode rejection ratio vs Frequency 13 kSVR Supply voltage rejection ratio vs Frequency 14 SR Slew rate vs Temperature 15 φm Phase margin vs Temperature 16 φ Phase shift vs Frequency 11 Equivalent input noise voltage vs Bandwidth vs Source resistance vs Supply voltage vs Temperature vs Frequency 17 18 19 20 21 Vn 6 9 10 11, 12 Gain-bandwidth product vs Temperature 16 IOS Short-circuit output current vs Time 22 ICC Supply current vs Supply voltage 23 Pulse response Small signal Large signal 24 25 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS INPUT OFFSET VOLTAGE OF REPRESENTATIVE INDIVIDUAL UNITS vs FREE-AIR TEMPERATURE WARM-UP CHANGE IN INPUT OFFSET VOLTAGE vs ELAPSED TIME 100 VCC ± = ± 15 V ΔV IO − Change in Input Offset Voltage − μV 80 OP27A 40 OP27A 20 0 − 20 − 40 OP27C − 60 − 80 − 100 − 50 10 OP27C 5 OP27A 0 − 25 0 25 50 75 100 125 1 TA − Free-Air Temperature − °C 2 3 4 5 Time After Power On − minutes Figure 1 Figure 2 LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF REPRESENTATIVE INDIVIDUAL UNITS 6 ΔV IO − Change in Input Offset Voltage − μV VIO − Input Offset Voltage − μV OP27C 60 VCC ± = ± 15 V TA = 25°C 0.2-μV/mo Trend Line 4 2 0 −2 −4 0.2-μV/mo Trend Line −6 0 1 2 3 4 5 6 7 8 Time − months Figure 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS INPUT OFFSET CURRENT vs FREE-AIR TEMPERATURE INPUT BIAS CURRENT vs FREE-AIR TEMPERATURE ± 50 50 40 I IB − Input Bias Current − nA I IO − Input Offset Current − nA VCC ± = ± 15 V 30 20 OP27C 10 VCC ± = ± 15 V ± 40 ± 30 ± 20 OP27C ± 10 OP27A OP27A 0 − 75 − 50 − 25 0 25 50 75 100 0 − 75 125 − 50 − 25 TA − Free-Air Temperature − °C COMMON-MODE INPUT VOLTAGE RANGE LIMITS vs SUPPLY VOLTAGE 75 100 125 MAXIMUM PEAK OUTPUT VOLTAGE vs LOAD RESISTANCE 20 16 TA = − 55°C VOM − Maximum Peak Output Voltage − V VVICR ICR − Common-Mode Input Voltage Range Limits − V 50 Figure 5 12 TA = 25°C 8 4 TA = 125°C 0 −4 TA = − 55°C −8 TA = 25°C − 12 TA = 125°C − 16 0 ±5 ±10 ± 15 ± 20 18 VCC ± = ± 15 V TA = 25°C 16 14 Positive Swing 12 10 Negative Swing 8 6 4 2 0 0.1 VCC + − Supply Voltage − V 1 RL − Load Resistance − kΩ Figure 6 8 25 TA − Free-Air Temperature − °C Figure 4 ÁÁ ÁÁ ÁÁ 0 Figure 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 10 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS OP27 VV OPP − Maximum Peak-to-Peak Output Voltage − V O(PP) MAXIMUM PEAK-TO-PEAK OUTPUT VOLTAGE vs FREQUENCY 28 VCC ± = ± 15 V RL = 1 kΩ TA = 25°C 24 20 16 12 8 ÁÁ ÁÁ ÁÁ ÁÁ 4 0 1k 10 k 100 k 1M f − Frequency − Hz 10 M OP27A OP27A LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION vs TOTAL SUPPLY VOLTAGE LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION vs LOAD RESISTANCE 2500 2400 A VD − Differential Voltage Amplification − V/mV A VD − Differential Voltage Amplification − V/mV Figure 8. VO = ± 10 V TA = 25°C 2000 RL = 2 kΩ 1500 RL = 1 kΩ 1000 500 0 0 10 20 30 40 50 2200 2000 VCC ± = ± 15 V VO = ± 10 V TA = 25°C 1800 1600 1400 1200 1000 800 600 400 0.1 VCC + − VCC − − Total Supply Voltage − V 1 10 100 RL − Load Resistance − kΩ Figure 9 Figure 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS OP27 A VD − Differential Voltage Amplification − dB LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION AND PHASE SHIFT vs FREQUENCY 25 80° VCC ± = ± 15 V RL = 1 kΩ TA = 25°C 20 15 120° Phase Shift φ m = 70° 10 100° 140° 5 160° 0 180° AVD −5 200° − 10 220° 100 10 f − Frequency − Hz 1 Figure 11. OP27A OP27A COMMON-MODE REJECTION RATIO vs FREQUENCY 140 140 VCC ± = ± 15 V RL = 2 kΩ TA = 25°C 120 100 80 60 40 OP27A 20 0 −20 0.1 1 10 100 1 k 10 k f − Frequency − Hz 1M 100 M CMRR − Common-Mode Rejection Ratio − dB A VD − Differential Voltage Amplification − dB LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION vs FREQUENCY 120 100 80 OP27A 60 40 1k 10 k 100 k f − Frenquency − Hz Figure 12 10 VCC ± = ± 15 V VIC = ± 10 V TA = 25°C Figure 13 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1M 10 M OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS SUPPLY VOLTAGE REJECTION RATIO vs FREQUENCY SLEW RATE vs FREE-AIR TEMPERATURE 6 VCC ± = ± 4 V to ± 18 V TA = 25°C 140 100 SR − Slew Rate − V/ μ s 120 Negative Supply 80 60 VCC ± = ± 15 V RL ≥ 2 kΩ 4 OP27 (AVD ≥ 1) 2 40 Positive Supply 0 1 10 100 1k 10 k 100 k 1 M 0 − 50 10 M 100 M − 25 f − Frequency − Hz 0 25 50 75 100 TA − Free Air Temperature − °C Figure 14 125 Figure 15 OP27 PHASE MARGIN AND GAIN-BANDWIDTH PRODUCT vs FREE-AIR TEMPERATURE 85° 80° 11 VCC ± = ± 15 V 10.6 75° 10.2 φm 70° 9.8 65° 9.4 60° 9 55° 8.6 ÁÁ ÁÁ 50° GBW (f = 100 kHz) 8.2 45° 7.8 40° 7.4 35° − 75 − 50 − 25 0 25 50 75 100 Gain-Bandwidth Product − MHz 20 Φ − Phase Margin φm kSVR − Supply Voltage Rejection Ratio − dB 160 7 125 TA − Free-Air Temperature − °C Figure 16. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 11 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS EQUIVALENT INPUT NOISE VOLTAGE vs BANDWIDTH TOTAL EQUIVALENT INPUT NOISE VOLTAGE vs SOURCE RESISTANCE 100 1 0.1 0.01 0.1 VCC ± = ± 15 V BW = 1 Hz TA = 25°C Hz VCC ± = ± 15 V RS = 20 Ω TA = 25°C Total Equivalent Input Noise Voltage − nV/ Vn − Equivalent Input Noise Voltage − μV 10 1 10 Bandwidth − kHz (0.1 Hz to frequency indicated) 100 10 f = 10 Hz Resistor Noise Only f = 1 kHz 1 100 1k OP27A OP27A EQUIVALENT INPUT NOISE VOLTAGE vs TOTAL SUPPLY VOLTAGE EQUIVALENT INPUT NOISE VOLTAGE vs FREE-AIR TEMPERATURE 5 Vn − Equivalent Input Noise Voltage − nV/ Hz Vn − Equivalent Input Noise Voltage − nV/ Hz Figure 18 15 f = 10 Hz f = 1 kHz 10 5 0 10 20 30 40 VCC ± = ± 15 V RS = 20 Ω BW = 1 Hz f = 10 Hz 4 3 f = 1 kHz 2 1 − 50 − 25 0 25 Figure 19 Figure 20 POST OFFICE BOX 655303 50 75 TA − Free-Air Temperature − °C VCC + − VCC − − Total Supply Voltage − V 12 10 k RS − Source Resistance − Ω RS = 20 Ω BW = 1 Hz TA = 25°C 0 − + R2 RS = R1 + R2 Figure 17 20 R1 • DALLAS, TEXAS 75265 100 125 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS OP27A Vn − Equivalent Input Noise Voltage − nV/ Hz EQUIVALENT INPUT NOISE VOLTAGE vs FREQUENCY 10 9 8 7 VCC ± = ± 15 V RS = 20 Ω BW = 1 Hz TA = 25°C 6 5 4 3 1/f Corner = 2.7 Hz 2 1 10 1 100 1000 f − Frequency − Hz Figure 21 SHORT-CIRCUIT OUTPUT CURRENT vs ELAPSED TIME SUPPLY CURRENT vs TOTAL SUPPLY VOLTAGE ÁÁ ÁÁ ÁÁ 5 VCC ± = ± 15 V TA = 25°C 50 IICC CC − Supply Current − mA IIOS OS − Short-Circuit Output Current − mA 60 IOS − 40 ÁÁ ÁÁ ÁÁ 30 IOS + 20 10 4 TA = 125°C 3 TA = 25°C 2 TA = − 55°C 1 0 1 2 3 t − Time − minutes 4 5 5 15 25 35 45 VCC + − VCC − − Total Supply Voltage − V Figure 22 Figure 23 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 13 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 OP27 OP27 VOLTAGE FOLLOWER SMALL-SIGNAL PULSE RESPONSE VOLTAGE FOLLOWER LARGE-SIGNAL PULSE RESPONSE 80 8 60 6 40 4 VO − Output Voltage − V VO − Output Voltage − mV TYPICAL CHARACTERISTICS 20 0 − 20 VCC ± = ± 15 V AV = 1 CL = 15 pF TA = 25°C − 40 − 60 2 0 −2 −4 VCC ± = ± 15 V AV = − 1 TA = 25°C −6 − 80 −8 0 0.5 1 1.5 t − Time − μs 2 2.5 0 3 Figure 24 2 4 6 t − Time − μs 8 10 12 Figure 25 APPLICATION INFORMATION general The OP27 series devices can be inserted directly onto OP07, OP05, μA725, and SE5534 sockets with or without removing external compensation or nulling components. In addition, the OP27 can be fitted to μA741 sockets by removing or modifying external nulling components. noise testing Figure 26 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27. The frequency response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero. Because the time limit acts as an additional zero to eliminate noise contributions from the frequency band below 0.1 Hz, the test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds. Measuring the typical 80-nV peak-to-peak noise performance of the OP27 requires the following special test precautions: 14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 APPLICATION INFORMATION noise testing (continued) 1. The device should be warmed up for at least five minutes. As the operational amplifier warms up, the offset voltage typically changes 4 μV due to the chip temperature increasing from 10°C to 20°C starting from the moment the power supplies are turned on. In the 10-s measurement interval, these temperature-induced effects can easily exceed tens of nanovolts. 2. For similar reasons, the device should be well shielded from air currents to eliminate the possibility of thermoelectric effects in excess of a few nanovolts, which would invalidate the measurements. 3. Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect that increases observed noise. AVD − Differential Voltage Amplification − dB 100 90 80 70 60 50 40 30 0.01 0.1 1 10 f − Frequency − Hz 100 0.1 μF 100 kΩ 10 Ω − LT1001 2 kΩ + − + OP27 Device Under Test Voltage Gain = 50,000 4.7 μF 4.3 kΩ 100 kΩ 2.2 μF 24.3 kΩ 0.1 μF 22 μF Oscilloscope Rin = 1 MΩ 110 kΩ NOTE: All capacitor values are for nonpolarized capacitors only. Figure 26. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 15 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 APPLICATION INFORMATION noise testing (continued) When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hz noise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading since both results are determined by the white noise and the location of the 1/f corner frequency. Figure 27 shows a circuit measuring current noise and the formula for calculating current noise. 10kΩ 100 Ω 500 kΩ − 500 kΩ + Vno In = [Vno2 − (130 nV)2]1/2 1 MΩ × 100 Figure 27. Current Noise Test Circuit and Formula offset voltage adjustment The input offset voltage and temperature coefficient of the OP27 are permanently trimmed to a low level at wafer testing. However, if further adjustment of VIO is necessary, using a 10-kΩ nulling potentiometer as shown in Figure 28 does not degrade the temperature coefficient αVIO. Trimming to a value other than zero creates an αVIO of VIO/300 μV/°C. For example, if VIO is adjusted to 300 μV, the change in αVIO is 1 μV/°C. The adjustment range with a 10-kΩ potentiometer is approximately ± 2.5 mV. If a smaller adjustment range is needed, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer in conjunction with fixed resistors. The example in Figure 29 has an approximate null range of ± 200 μV. 4.7 kΩ 10 kΩ 1 kΩ 15 V 1 2 − Input 3 + 15 V 8 4.7 kΩ 7 6 Output 2 4 Input −15 V 1 8 7 6 3 Output 4 Figure 28. Standard Input Offset Voltage Adjustment −15 V Figure 29. Input Offset Voltage Adjustment With Improved Sensitivity offset voltage and drift Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilar metals at the contacts to the input terminals can exceed the inherent temperature coefficient ∝VIO of the amplifier. Air currents should be minimized, package leads should be short, and the two input leads should be close together and at the same temperature. 16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 APPLICATION INFORMATION offset voltage and drift (continued) The circuit shown in Figure 30 measures offset voltage. This circuit can also be used as the burn-in configuration for the OP27 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, and AVD = 100. R1 50 kΩ 15 V 2 R2 100 Ω 3 R3 50 kΩ 7 − + 6 VO = 1000 VIO 4 −15 V NOTE A: Resistors must have low thermoelectric potential. Figure 30. Test Circuit for Offset Voltage and Offset Voltage Temperature Coefficient unity gain buffer applications The resulting output waveform, when Rf ≤ 100 Ω and the input is driven with a fast large-signal pulse (>1 V), is shown in the pulsed-operation diagram in Figure 31. Rf 2.8 V/μs − Output + OP27 Figure 31. Pulsed Operation During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectively short the output to the input, and a current, limited only by the output short-circuit protection, is drawn by the signal generator. When Rf ≥ 500 Ω, the output is capable of handling the current requirements (load current ≤20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When Rf > 2 kΩ, a pole is created with Rf and the amplifier’s input capacitance, creating additional phase shift and reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with Rf eliminates this problem. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 17 OP27A, OP27C LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010 APPLICATION INFORMATION unity gain buffer applications (continued) 120 Noise Voltage − nV 100 80 60 40 20 0 0 2 4 8 6 10 t − Time − seconds Type S Thermocouples 5.4 μV/°C at 0°C + #1 − + Cold-Junction Circuitry To Gate Drive + − #2 − + AVD = 10,000 + OP27 − Typical Multiplexing FET Switches 0.05 μF #24 High-Quality Single-Point Ground − Output 100 kΩ 10 Ω NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier’s bandwidth cannot be limited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.11 μV, which is equivalent to an error of only 0.02°C. Figure 32. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz to 10-Hz Peak-to-Peak Noise Voltage 18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) JM38510/13506BPA ACTIVE CDIP JG 8 1 TBD Call TI N / A for Pkg Type -55 to 125 JM38510 /13506BPA M38510/13506BPA ACTIVE CDIP JG 8 1 TBD Call TI N / A for Pkg Type -55 to 125 JM38510 /13506BPA OP27AFKB ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type OP27AFKB OP27AJGB ACTIVE CDIP JG 8 1 TBD Call TI N / A for Pkg Type OP27AJGB OP27CJGB ACTIVE CDIP JG 8 1 TBD Call TI N / A for Pkg Type OP27CJGB (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) 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