OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 • JG OR P PACKAGE (TOP VIEW) Direct Replacements for PMI and LTC OP27 and OP37 Series Features of OP27A, OP27C, OP37A, and OP37C: • Maximum Equivalent Input Noise Voltage: 3.8 nV/√Hz at 1 kHz 5.5 nV/√Hz at 10 kHz • Very Low Peak-to-Peak Noise Voltage at 0.1 Hz to 10 Hz . . . 80 nV Typ • Low Input Offset Voltage . . . 25 µV Max • High Voltage Amplification . . . 1 V/µV Min Feature of OP37 Series: • Minimum Slew Rate . . . 11 V/µs VIO TRIM IN – IN + VCC – 1 8 2 7 3 6 4 5 VIO TRIM VCC + OUT NC NC VIOTRIM NC NC 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 VIOTRIM NC The OP27 and OP37 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 and OP37 make these devices excellent choices for low-noise amplifier applications requiring precision performance and reliability. Additionally, the OP37 is free of latch-up in high-gain, large-capacitive-feedback configurations. The OP27 series is compensated for unity gain. The OP37 series is decompensated for increased bandwidth and slew rate and is stable down to a gain of 5. The OP27A, OP27C, OP37A, and OP37C are characterized for operation over the full military temperature range of – 55°C to 125°C. The OP27E, OP27G, OP37E, and OP37G are characterized for operation from – 25°C to 85°C. 4 NC – No internal connection symbol IN + IN – 3 2 + 6 OUT – 1 8 VIO TRIM Pin numbers are for the JG and P packages. AVAILABLE OPTIONS TA VIOmax AT 25°C 25 µV – 25°C to 85°C 100 µV 25 µV – 55°C to 125°C 100 µV STABLE GAIN PACKAGE CERAMIC DIP (JG) CHIP CARRIER (FK) PLASTIC DIP (P) 1 — — OP27EP 5 — — OP37EP 1 — — OP27GP 5 — — OP37GP 1 OP27AJG OP27AFK — 5 OP37AJG OP37AFK — 1 OP27CJG — — 5 OP37CJG — — Copyright 1994, 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. • DALLAS, TEXAS 75265 • HOUSTON, TEXAS 77251–1443 POST OFFICE BOX 655303 POST OFFICE BOX 1443 2–1 † C1 = 120 pF for OP27 C1 = 15 pF for OP37 Q2A Q1B Q2B IN + 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 – • HOUSTON, • DALLAS, POST POST OFFICE OFFICE BOXBOX 1443655303 TEXAS TEXAS 77251–1443 75265 Q3 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED OPERATIONAL AMPLIFIER VIO TRIM VIO TRIM VCC + Q19 OUT SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 2–2 schematic OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 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, OP37A, OP37C . . . . . . . . . . . . . . . – 55°C to 125°C OP27E, OP27G, OP37E, OP37G . . . . . . . . . . . . . . . – 25°C to 85°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 Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds : P package . . . . . . . . . . . . . . . . . . . . 260°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 P 1050 mW 1375 mW 1000 mW 8.4 mW/°C 11.0 mW/°C 8.0 mW/°C 546 mW 715 mW 520 mW 210 mW 275 mW N/A • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–3 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 recommended operating conditions OP27A, OP37A MIN NOM OP27C, OP37C 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, IIO Input offset current VO = 0 0, VIC = 0 IIB Input bias current VO = 0 0, VIC = 0 AVD Large-signal Large signal differential voltage amplification RL ≥ 0.6 kΩ, VO = ± 1 V, VCC± = ± 4 V RL ≥ 2 kΩ, ri(CM) Common-mode input resistance ro Output resistance CMRR Common-mode rejection j ratio kSVR Supply y voltage g rejection j ratio VO = ± 10 V VO = ± 10 V VO = ± 10 V Full range 30 100 300 µV/°C 0.2 1 0.4 2 µV/mo 7 35 12 75 ±10 135 ± 40 ± 15 ± 60 11 to – 11 10.3 to – 10.3 10.5 to – 10.5 ± 11.5 1800 800 1500 250 700 600 25°C 100 VCC ± = ± 4.5 V to ± 18 V Full range 96 V ± 11.5 ± 13.5 ± 10 ± 11.5 700 V 1500 1500 200 70 110 nA 500 V/mV 300 25°C Full range nA 10.5 1000 VIC = ± 10 V VCC ± = ± 4 V to ± 18 V ± 80 ± 150 11 to – 11 114 µV 1.8 50 25°C UNIT 0.4 3 VO = 0, IO = 0 VIC = ± 11 V MAX 0.6 ± 10 ± 11.5 Full range TYP 0.2 ± 12 ± 13.8 RL ≥ 2 kΩ MIN 60 25°C RL ≥ 2 kΩ RL ≥ 0.6 kΩ RL ≥ 1 kΩ, 25 Full range Full range RL ≥ 2 kΩ, 10 Full range Common-mode input voltage range Peak output voltage swing MAX 25°C 25°C OP27C, OP37C TYP Full range Full range See Note 4 VOM MIN 25°C VIC = 0 See Note 3 Long-term drift of input offset voltage VICR OP27A, OP37A 126 100 2 GΩ 70 Ω 120 94 120 94 86 118 dB 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). 2–4 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 recommended operating conditions Supply voltage, VCC + Supply voltage, VCC – VCC ± = ± 15 V, VCC ± = ± 15 V, Common mode input voltage, Common-mode voltage VIC MIN NOM MAX 4 15 22 V –4 – 15 – 22 V ± 11 TA = 25°C TA = – 55°C to 125°C V ± 10.5 Operating free-air temperature, TA UNIT – 25 85 °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, 25°C VIC = 0 See Note 3 See Note 4 IIO Input offset current VO = 0 0, VIC = 0 IIB Input bias current VO = 0 0, VIC = 0 AVD Large-signal Large signal differential voltage amplification ri(CM) Common-mode input resistance ro Output resistance CMRR Common-mode rejection j ratio kSVR Supply y voltage g rejection j ratio Full range VO = ± 10 V VO = ± 10 V RL ≥ 1 kΩ, RL ≥ 0.6 kΩ, VO = ± 1 V, VCC± = ± 4 V RL ≥ 2 kΩ, VO = ± 10 V Full range VO = 0, IO = 0 VIC = ± 11 V MAX 30 100 220 1.8 µV/°C 0.2 1 0.4 2 µV/mo 7 35 12 ± 10 ± 40 ± 15 11 to – 11 10.3 to – 10.3 10.5 to – 10.5 1800 800 1500 250 700 600 25°C 114 110 25°C 100 VCC ± = ± 4.5 V to ± 18 V Full range 96 nA nA V ± 11.5 ± 13.5 ± 10 ± 11.5 V 10.5 1000 Full range ± 80 ± 150 11 to – 11 ± 11.5 75 135 ± 60 VIC = ± 10 V VCC ± = ± 4 V to ± 18 V µV 0.4 50 25°C UNIT 0.6 ± 10 ± 11.5 RL ≥ 2 kΩ TYP 0.2 ± 12 ± 13.8 RL ≥ 0.6 kΩ MIN 60 25°C RL ≥ 2 kΩ RL ≥ 2 kΩ, 25 Full range Common-mode input voltage range Peak output voltage swing 10 25°C Full range VOM MAX Full range 25°C OP27G, OP37G TYP Full range Full range Long-term drift of input offset voltage VICR OP27E, OP37E MIN 700 1500 1500 200 500 V/mV 450 3 2 GΩ 70 70 Ω 126 100 120 96 120 94 90 118 dB dB † Full range is – 25°C to 85°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). • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–5 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 OP27 operating characteristics over operating free-air temperature range, VCC± = ±15 V PARAMETER SR Slew rate VN(PP) Peak-to-peak equivalent input noise voltage TEST CONDITIONS AVD ≥ 1, RL ≥ 2 kΩ f = 0.1 Hz to 10 Hz, RS = 20 Ω, See Figure 34 In Equivalent input noise voltage Equivalent input noise current Gain-bandwidth product TYP 1.7 2.8 OP27C, OP27G MAX MIN TYP 1.7 2.8 MAX 0.18 0.09 0.25 3.5 5.5 3.8 8 f = 30 Hz, RS = 20 Ω RS = 20 Ω 3.1 4.5 3.3 5.6 f = 1 kHz, RS = 20 Ω 3 3.8 3.2 4.5 f = 10 Hz, See Figure 35 1.5 4 1.5 f = 30 Hz, See Figure 35 1 2.3 1 f = 1 kHz, See Figure 35 0.4 0.6 0.4 f = 100 kHz 5 8 5 UNIT V/µs 0.08 f = 10 Hz, Vn OP27A, OP27E MIN µV nV/√Hz pA/√Hz 0.6 8 MHz OP37 operating characteristics over operating free-air temperature range, VCC± = ±15 V PARAMETER SR Slew rate VN(PP) Peak-to-peak equivalent input noise voltage Vn Equivalent E i l t input i t noise i voltage TEST CONDITIONS AVD ≥ 5, RL ≥ 2 kΩ f = 0.1 Hz to 10 Hz, RS = 20 Ω, See Figure 34 Equivalent input noise current Gain bandwidth product Gain-bandwidth 2–6 MIN TYP 11 17 OP37C, OP37G MAX MIN TYP 11 17 0.08 0.18 0.09 MAX 0.25 RS = 20 Ω RS = 20 Ω 3.5 5.5 3.8 8 3.1 4.5 3.3 5.6 f = 1 kHz, RS = 20 Ω 3 3.8 3.2 4.5 1.5 f = 10 Hz, See Figure 35 1.5 4 f = 30 Hz, See Figure 35 1 2.3 1 f = 1 kHz, See Figure 35 0.4 0.6 0.4 f = 10 kHz AV ≥ 5, 45 f = 1 MHz • 63 40 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 45 63 40 UNIT V/µs f = 30 Hz, f = 10 Hz, In OP37A, OP37E µV nV/√Hz pA/√Hz 0.6 MHz OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 TYPICAL CHARACTERISTICS Table of Graphs FIGURE VIO Input offset voltage vs Temperature 1 ∆VIO Change in input offset voltage vs Time after power on vs Time (long-term drift) 2 3 IIO IIB Input offset current vs Temperature 4 Input bias current vs Temperature 5 VICR VOM Common-mode input voltage range vs Supply voltage 6 Maximum peak output voltage vs Load resistance 7 VO(PP) Maximum peak-to-peak output voltage vs Frequency AVD Differential voltage amplification vs Supply voltage vs Load resistance vs Frequency CMRR Common-mode rejection ratio vs Frequency 15 kSVR Supply voltage rejection ratio vs Frequency 16 SR Slew rate vs Temperature vs Supply voltage vs Load resistance 17 18 19 φm φ Phase margin vs Temperature 20, 21 Phase shift vs Frequency 12, 13 Vn Equivalent input noise voltage vs Bandwidth vs Source resistance vs Supply voltage vs Temperature vs Frequency In Equivalent input noise current vs Frequency Gain-bandwidth product vs Temperature Short-circuit output current vs Time Supply current vs Supply voltage Pulse response Small signal Large signal IOS ICC • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 8, 9 10 11 12, 13, 14 22 23 24 25 26 27 20, 21 28 29 30, 32 31, 33 2–7 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 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 ∆V IO – Change in Input Offset Voltage – µV 80 VIO – Input Offset Voltage – µV OP27C/37C 60 40 OP27A/37A OP27A/37A 20 0 OP27E/37E – 20 – 40 OP27G/37G OP27C/37C – 60 – 80 – 100 – 50 – 25 0 25 50 75 100 VCC ± = ± 15 V TA = 25°C 10 OP27CP/GP OP37CP/GP 5 OP27AP/EP OP37AP/EP 0 125 1 TA – Free-Air Temperature – °C 2 3 Time After Power On – minutes Figure 1 Figure 2 LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF REPRESENTATIVE INDIVIDUAL UNITS ∆V IO – Change in Input Offset Voltage – µV 6 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 † Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only. 2–8 4 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 5 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 TYPICAL CHARACTERISTICS† INPUT OFFSET CURRENT vs FREE-AIR TEMPERATURE INPUT BIAS CURRENT vs FREE-AIR TEMPERATURE ± 50 50 I IO – Input Offset Current – nA VCC ± = ± 15 V I IB – Input Bias Current – nA 40 30 20 OP27C/G OP37C/G 10 VCC ± = ± 15 V ± 40 ± 30 OP27C/G OP37C/G ± 20 ± 10 OP27A/E OP37A/E 0 – 75 – 50 OP27A/E OP37A/E – 25 0 25 50 75 100 0 – 75 125 – 50 – 25 TA – Free-Air Temperature – °C 50 75 100 125 Figure 5 COMMON-MODE INPUT VOLTAGE RANGE LIMITS vs SUPPLY VOLTAGE 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 25 TA – Free-Air Temperature – °C Figure 4 12 TA = 25°C 8 4 TA = 125°C 0 –4 TA = – 55°C –8 ÁÁ ÁÁ ÁÁ 0 TA = 25°C – 12 TA = 125°C – 16 0 ±5 ±10 ± 15 18 VCC ± = ± 15 V TA = 25°C 16 14 Positive Swing 12 10 Negative Swing 8 6 4 2 0 ± 20 0.1 VCC + – Supply Voltage – V 1 10 RL – Load Resistance – kΩ Figure 6 Figure 7 † Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–9 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 OP27 OP37 MAXIMUM PEAK-TO-PEAK OUTPUT VOLTAGE vs FREQUENCY MAXIMUM PEAK-TO-PEAK OUTPUT VOLTAGE vs FREQUENCY VV OPP – Maximum Peak-to-Peak Output Voltage – V O(PP) VV OPP – Maximum Peak-to-Peak Output Voltage – V O(PP) TYPICAL CHARACTERISTICS 28 VCC ± = ± 15 V RL = 1 kΩ TA = 25°C 24 20 16 12 ÁÁ ÁÁ ÁÁ ÁÁ 8 4 0 1k 10 k 100 k 1M f – Frequency – Hz 10 M 28 VCC ± = ± 15 V RL = 1 kΩ TA = 25°C 24 20 16 12 ÁÁ ÁÁ ÁÁ ÁÁ 8 4 0 10 k 100 k 1M f – Frequency – Hz Figure 9 OP27A, OP27E, OP37A, OP37E OP27A, OP27E, OP37A, OP37E 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 RL – Load Resistance – kΩ Figure 10 2–10 10 M Figure 11 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 100 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 OP27 OP37 LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION AND PHASE SHIFT vs FREQUENCY LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION AND PHASE SHIFT vs FREQUENCY 20 15 120° Phase Shift φ m = 70° 10 140° ÁÁ ÁÁ 5 160° 0 180° AVD –5 200° – 10 220° 100 10 f – Frequency – Hz 1 80° 60 Phase Shift VCC ± =± 15 V RL = 1 kΩ TA = 25°C 50 100° 120° 40 AVD 30 140° φ m = 71° Á Á 20 160° 10 180° 0 200° – 10 0.1 220° 100 1 10 f – Frequency – MHz Figure 12 φ – Phase Shift 80° VCC ± = ± 15 V RL = 1 kΩ 100° TA = 25°C φ – Phase Shift 25 A VD – Differential Voltage Amplification – dB A VD – Differential Voltage Amplification – dB TYPICAL CHARACTERISTICS Figure 13 OP27A, OP27E, OP37A, OP37E OP27A, OP27E, OP37A, OP37E COMMON-MODE REJECTION RATIO vs FREQUENCY 140 140 VCC ± = ± 15 V RL = 2 kΩ TA = 25°C 120 CMRR – Common-Mode Rejection Ratio – dB A VD – Differential Voltage Amplification – dB LARGE-SIGNAL DIFFERENTIAL VOLTAGE AMPLIFICATION vs FREQUENCY 100 80 OP37A/E 60 40 OP27A/E 20 0 – 20 0.1 1 10 100 1 k 10 k f – Frequency – Hz 1M 120 100 OP37A/E 80 OP27A/E 60 40 1k 100 M VCC ± = ± 15 V VIC = ± 10 V TA = 25°C 10 k 100 k 1M 10 M f – Frenquency – Hz Figure 14 Figure 15 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–11 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 TYPICAL CHARACTERISTICS† SUPPLY VOLTAGE REJECTION RATIO vs FREQUENCY SLEW RATE vs FREE-AIR TEMPERATURE 20 VCC ± = ± 4 V to ± 18 V TA = 25°C 140 18 VCC ± = ± 15 V RL ≥ 2 kΩ OP37 (AVD ≥ 5) 16 120 100 SR – Slew Rate – V/ µ s kSVR – Supply Voltage Rejection Ratio – dB 160 Negative Supply 80 60 14 12 10 8 6 40 20 0 4 Positive Supply 1 10 100 1k 2 10 k 100 k 1 M 0 – 50 10 M 100 M OP27 (AVD ≥ 1) – 25 f – Frequency – Hz Figure 16 OP37 OP37 SLEW RATE vs SUPPLY VOLTAGE SLEW RATE vs LOAD RESISTANCE 19 Rise Fall 15 SR – Slew Rate – V/ µ s SR – Slew Rate – V/ µ s AVD = 5 RL = 2 kΩ TA = 25°C 10 5 18 VCC ± = ± 15 V AVD = 5 VO(PP) = 20 V TA = 25°C 17 16 ±6 ±9 ± 12 ± 15 ± 18 15 0.1 ± 21 VCC ± – Supply Voltage – V Figure 18 1 10 f – Frequency – Hz Figure 19 † Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only. 2–12 125 Figure 17 20 0 ±3 0 25 50 75 100 TA – Free Air Temperature – °C • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 100 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 TYPICAL CHARACTERISTICS† OP27 OP37 PHASE MARGIN AND GAIN-BANDWIDTH PRODUCT vs FREE-AIR TEMPERATURE PHASE MARGIN AND GAIN-BANDWIDTH PRODUCT vs FREE-AIR TEMPERATURE Φ – Phase Margin φm 75° φm 80° 10.6 75° 10.2 70° 80 65° 75 60° 70 70° 9.8 65° 9.4 ÁÁ ÁÁ 60° 9 55° 8.6 50° 8.2 GBW (f = 100 kHz) 45° 7.8 40° 7.4 35° – 75 – 50 – 25 0 25 50 75 100 VCC ± = ± 15 V ÁÁ ÁÁ GBW (f = 10 kHz) 55° 60 45° 55 40° 50 35° 45 – 25 0 Figure 20 50 75 100 40 125 Figure 21 EQUIVALENT INPUT NOISE VOLTAGE vs BANDWIDTH TOTAL EQUIVALENT INPUT NOISE VOLTAGE vs SOURCE RESISTANCE 100 10 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 25 TA – Free-Air Temperature – °C TA – Free-Air Temperature – °C 1 0.1 0.01 0.1 65 50° 30° – 50 7 125 85 φm Gain-Bandwidth Product – MHz 80° 11 Φ – Phase Margin φm VCC ± = ± 15 V Gain-Bandwidth Product – MHz 85° 1 10 Bandwidth – kHz (0.1 Hz to frequency indicated) 100 R1 – + R2 RS = R1 + R2 10 f = 10 Hz Resistor Noise Only f = 1 kHz 1 100 1k 10 k RS – Source Resistance – Ω Figure 22 Figure 23 † Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–13 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 TYPICAL CHARACTERISTICS† OP27A, OP27E, OP37A, OP37E EQUIVALENT INPUT NOISE VOLTAGE vs FREE-AIR TEMPERATURE 5 RS = 20 Ω BW = 1 Hz TA = 25°C Vn – Equivalent Input Noise Voltage – nV/ Hz Vn – Equivalent Input Noise Voltage – nV/ Hz 20 OP27A, OP27E, OP37A, OP37E EQUIVALENT INPUT NOISE VOLTAGE vs TOTAL SUPPLY VOLTAGE 15 f = 10 Hz f = 1 kHz 10 5 10 20 30 f = 10 Hz 4 3 f = 1 kHz 2 1 – 50 0 0 VCC ± = ± 15 V RS = 20 Ω BW = 1 Hz 40 – 25 0 25 50 75 100 125 TA – Free-Air Temperature – °C VCC + – VCC – – Total Supply Voltage – V Figure 24 Figure 25 OP27A, OP27E, OP37A, OP37E EQUIVALENT INPUT NOISE CURRENT vs FREQUENCY 10 9 8 7 10 VCC ± = ± 15 V RS = 20 Ω BW = 1 Hz TA = 25°C 6 I n – Equivalent Input Noise Current – pA/ Hz Vn – Equivalent Input Noise Voltage – nV/ Hz EQUIVALENT INPUT NOISE VOLTAGE vs FREQUENCY 5 4 3 1/f Corner = 2.7 Hz 2 1 VCC ± = ± 15 V BW = 1 Hz TA = 25°C 1 1/f Corner = 140 Hz 0.1 1 10 100 10 1000 100 1k f – Frequency – Hz f – Frequency – Hz Figure 26 Figure 27 † Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only. 2–14 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 10 k OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 TYPICAL CHARACTERISTICS† SHORT-CIRCUIT OUTPUT CURRENT vs ELAPSED TIME SUPPLY CURRENT vs TOTAL SUPPLY VOLTAGE 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 + ÁÁ ÁÁ 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 Figure 28 35 OP27 OP27 VOLTAGE FOLLOWER SMALL-SIGNAL PULSE RESPONSE VOLTAGE FOLLOWER LARGE-SIGNAL PULSE RESPONSE 80 8 60 6 40 4 20 0 – 20 VCC ± = ± 15 V AV = 1 CL = 15 pF TA = 25°C – 40 – 60 45 Figure 29 VO – Output Voltage – V VO – Output Voltage – mV 25 VCC + – VCC – – Total Supply Voltage – V 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 30 2 4 6 t – Time – µs 8 10 12 Figure 31 † Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–15 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 OP37 OP37 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 = 5 CL = 15 pF TA = 25°C – 40 – 60 2 0 –2 –4 VCC ± = ± 15 V AV = 5 TA = 25°C –6 – 80 –8 0 0.2 0.4 0.6 t – Time – µs 0.8 1 0 1.2 Figure 32 1 2 3 t – Time – µs 4 5 6 Figure 33 APPLICATION INFORMATION general The OP27 and OP37 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 and OP37 can be fitted to µA741 sockets by removing or modifying external nulling components. noise testing Figure 34 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27 and OP37. 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 and OP37 requires the following special test precautions: 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. 2–16 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 APPLICATION INFORMATION 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/OP37 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 34. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–17 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 APPLICATION INFORMATION 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 35 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 35. Current Noise Test Circuit and Formula offset voltage adjustment The input offset voltage and temperature coefficient of the OP27 and OP37 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 36 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 37 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 36. Standard Input Offset Voltage Adjustment –15 V Figure 37. 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. 2–18 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 APPLICATION INFORMATION offset voltage and drift (continued) The circuit shown in Figure 38 measures offset voltage. This circuit can also be used as the burn-in configuration for the OP27 and OP37 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 38. 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 39. Rf 2.8 V/µs – Output + OP27 Figure 39. 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 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 2–19 OP27A, OP27C, OP27E, OP27G OP37A, OP37C, OP37E, OP37G LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994 APPLICATION INFORMATION 120 Noise Voltage – nV 100 80 60 40 20 0 0 2 4 6 8 10 t – Time – seconds Type S Thermocouples 5.4 µV/°C at 0°C + #1 – Cold-Junction Circuitry To Gate Drive + + – AVD = 10,000 + OP27 – #2 – 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 40. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz To 10-Hz Peak-to-Peak Noise Voltage 2–20 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. 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