OPA121 BURR-BROWN | Alldatasheet
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Technical content
Low Cost Precision Difet® OPERATIONAL AMPLIFIER Difet® , Burr-Brown Corp. BIFET ® , National Semiconductor Corp. OPA121
FEATURES
l LOW NOISE: 6nV/√Hz typ at 10kHz l LOW BIAS CURRENT: 5pA max l LOW OFFSET: 2mV max l LOW DRIFT: 3µV/°C typ l HIGH OPEN-LOOP GAIN: 110dB min l HIGH COMMON-MODE REJECTION: 86dB min Noise-Free Cascode* Ω10k Trim +In –In Case (TO-99) and Substrate Output OPA121 Simplified Circuit +VCC –VCC 8 7 2kΩ Ω10k 2kΩ 2kΩ 2kΩ *Patented Trim
DESCRIPTION
The OPA121 is a precision monolithic dielectrically- isolated FET (Difet® ) operational amplifier. Out- standing performance characteristics are now available for low-cost applications. Noise, bias current, voltage offset, drift, open-loop gain, common-mode rejection, and power supply rejection are superior to BIFET ® amplifiers. Very low bias current is obtained by dielectric isolation with on-chip guarding. Laser-trimming of thin-film resistors gives very low offset and drift. Extremely low noise is achieved with new circuit design techniques (patented). A new cascode design allows high precision input specifica- tions and reduced susceptibility to flicker noise. Standard 741 pin configuration allows upgrading of existing designs to higher performance levels.
APPLICATIONS
l RADIATION HARD EQUIPMENT International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706 Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 © 1984 Burr-Brown Corporation PDS-539F Printed in U.S.A. September, 1993
NOTES: (1) Sample tested. (2) Offset voltage, offset current, and bias current are specified with the units fully warmed up. (3) Overload recovery is defined as the time required for the output to return from saturation to linear operation following the removal of a 50% input overdrive. (4) 100°C/W for KU grade. SPECIFICATIONS ELECTRICAL At VCC = ±15VDC and TA = +25°C unless otherwise noted. Pin 8 connected to ground. OPA121KM OPA121KP, KU PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS INPUT NOISE Voltage, fO = 10Hz (1) 40 50 nV/ √Hz fO = 100Hz (1) 15 18 nV/ √Hz fO = 1kHz (1) 8 10 nV/ √Hz fO = 10kHz (1) 6 7 nV/ √Hz fB = 10Hz to 10kHz (1) 0.7 0.8 µVrms fB = 0.1Hz to 10 Hz (1) 1.6 2 µVp-p Current, fB = 0.1Hz to 10Hz (1) 15 21 fA, p-p fO = 0.1Hz thru 20kHz (1) 0.8 1.1 fA/ √Hz OFFSET VOLTAGE (2) Input Offset Voltage V CM = 0VDC ±0.5 ±2 ±0.5 ±3m V Average Drift T A = TMIN to TMAX ±3 ±10 ±3 ±10 µV/°C Supply Rejection 86 104 86 104 dB ±6 ±50 ±6 ±50 µV/V BIAS CURRENT (2) Input Bias Current V CM = 0VDC ±1 ±5 ±1 ±10 pA Device Operating OFFSET CURRENT (2) Input Offset Current V CM = 0VDC ±0.7 ±4 ±0.7 ±8p A Device Operating IMPEDANCE Differential 10 13 || 1 10 13 || 1 Ω || pF Common-Mode 10 14 || 3 10 14 || 3 Ω || pF VOLTAGE RANGE Common-Mode Input Range ±10 ±11 ±10 ±11 V Common-Mode Rejection V IN = ±10VDC 86 104 82 100 dB OPEN-LOOP GAIN, DC Open-Loop Voltage Gain R L ≥ 2kΩ 110 120 106 114 dB FREQUENCY RESPONSE Unity Gain, Small Signal 2 2 MHz Full Power Response 20Vp-p, R L = 2kΩ 32 32 kHz Slew Rate V O = ±10V, RL = 2kΩ 22 V / µs Settling Time, 0.1% Gain = –1, R L = 2kΩ 66 µs 0.01% 10V Step 10 10 µs Overload Recovery, 50% Overdrive(3) Gain = –1 5 5 µs RATED OUTPUT Voltage Output R L = 2kΩ± 11 ±12 ±11 ±12 V Current Output V O = ±10VDC ±5.5 ±10 ±5.5 ±10 mA Output Resistance DC, Open Loop 100 100 Ω Load Capacitance Stability Gain = +1 1000 1000 pF Short Circuit Current 10 40 10 40 mA POWER SUPPLY Rated Voltage ±15 ±15 VDC Voltage Range, Derated Performance ±5 ±18 ±5 ±18 VDC Current, Quiescent I O = 0mADC 2.5 4 2.5 4.5 mA TEMPERATURE RANGE Specification Ambient Temperature 0 +70 0 +70 °C Operating Ambient Temperature –40 +85 –25 +85 °C Storage Ambient Temperature –65 +150 –55 +125 °C θ Junction-Ambient 200 150 (4) °C/W The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
ELECTRICAL (FULL TEMPERATURE RANGE SPECIFICATIONS) At VCC = ±15VDC and TA = TMIN to TMAX unless otherwise noted. OPA121KM OPA121KP, KU PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS TEMPERATURE RANGE Specification Range Ambient Temperature 0 +70 0 +70 °C INPUT OFFSET VOLTAGE (1) Input Offset Voltage V CM = 0VDC ±1 ±3 ±1 ±5m V Average Drift ±3 ±10 ±3 ±10 µV/°C Supply Rejection 82 94 82 94 dB ±20 ±80 ±20 ±80 µV/V BIAS CURRENT (1) Input Bias Current V CM = 0VDC ±23 ±115 ±23 ±250 pA Device Operating OFFSET CURRENT (1) Input Offset Current V CM = 0VDC ±16 ±100 ±16 ±200 pA Device Operating VOLTAGE RANGE Common-Mode Input Range ±10 ±11 ±10 ±11 V Common-Mode Rejection V IN = ±10VDC 82 98 80 96 dB OPEN-LOOP GAIN, DC Open-Loop Voltage Gain R L ≥ 2kΩ 106 116 100 110 dB RATED OUTPUT Voltage Output R L = 2kΩ± 10.5 ±11 ±10.5 ±11 V Current Output V O = ±10VDC ±5.25 ±10 ±5.25 ±10 mA Short Circuit Current V O = 0VDC 10 40 10 40 mA POWER SUPPLY Current, Quiescent I O = 0mADC 2.5 4.5 2.5 5 mA NOTE: (1) Offset voltage, offset current, and bias current are measured with the units fully warmed up.
PACKAGE INFORMATION
MODEL PACKAGE NUMBER (1) OPA121KM TO-99 001 OPA121KP 8-Pin Plastic DIP 006 OPA121KU 8-Pin SOIC 182 NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book. CONNECTION DIAGRAMS Top View M-Package TO-99 (Hermetic) Top View P-Package Plastic Mini-DIP U-Package Plastic SOIC Offset Trim Offset Trim Output +V CC Substrate and Case –In +In OPA121 –V CC OPA121 4 5 8Offset Trim +V CC–In +In –V CC Output Offset Trim Substrate TEMPERATURE MODEL PACKAGE RANGE OPA121KM TO-99 0 °C to +70°C OPA121KP 8-Pin Plastic DIP 0 °C to +70°C OPA121KU 8-Pin SOIC 0 °C to +70°C
ORDERING INFORMATION
Operating Temperature Range Lead Temperature NOTES: (1) Packages must be derated based on θJA = 150 °C/W (P package); θJA = 200°C/W (M package); θJA = 100°C/W (U package). (2) Short circuit may be to power supply common only. Rating applies to +25°C ambient. Observe dissipation limit and TJ.
11 k 10 100 10k 100k 1M 10M Frequency (Hz) 100 120 140 Voltage Gain (dB) OPEN-LOOP FREQUENCY RESPONSE KM –180 –135 –90 –45 Phase Shift (Degrees) Phase Margin ≈ 65° Ø Gain 11 k 10 100 10k 100k 1M 10M Frequency (Hz) 100 120 140 Common-Mode Rejection (dB) COMMON-MODE REJECTION vs FREQUENCY KM 11 k 10 100 10k 100k 1M 10M Frequency (Hz) 100 120 140 Power Supply Rejection (dB) POWER SUPPLY REJECTION vs FREQUENCY Common-Mode Voltage (V) 0.01 0.1 Bias Current (pA) BIAS AND OFFSET CURRENT vs INPUT COMMON-MODE VOLTAGE 0.01 0.1 Offset Current (pA) Bias Current Offset Current KM –50 –25 0 +25 +50 +75 +125 Ambient Temperature (°C) 0.01 100 0.1 Bias Current (pA) BIAS AND OFFSET CURRENT vs TEMPERATURE +100 0.01 100 0.1 Offset Current (pA) KM 1 10 100 1k 10k 100k 1M Frequency (Hz) 100 Voltage Noise (nV/√Hz) INPUT VOLTAGE NOISE SPECTRAL DENSITY KP, KU KM TYPICAL PERFORMANCE CURVES TA = +25°C, VCC = ±15VDC unless otherwise noted.
FIGURE 1. Offset Voltage Trim.INPUT PROTECTION levels even if both supply voltages are lost. TA = +25°C, VCC = ±15VDC unless otherwise noted.
precision IC operational amplifier. be shielded along with the external input circuitry. which is at the signal input potential. age and noise pickup (see Figure #2). amplifiers are affected by common-mode voltage (Figure 3). is not compromised by common-mode voltage. FIGURE 2. Connection of Input Guard.
3 OPA121
Guard top and bottom of board. FIGURE 3. Input Bias Current vs Common-Mode Voltage. Teflon™ E.I. du Pont de Nemours & Co.