ICL7621 Data Sheet May 2001 File Number 3403.4 Dual, Low Power CMOS Operational Amplifiers Features The ICL761X/762X series is a family of monolithic CMOS operational amplifiers. These devices provide the designer with high performance operation at low supply voltages and selectable quiescent currents. They are an ideal design tool when ultra low input current and low power dissipation are desired. • High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 1012Ω 1 • Input Current Lower Than BIFETs . . . . . . . . . . . 1pA (Typ) • Output Voltage Swing . . . . . . . . . . . . . . . . . . . . V+ and V• Available as Duals (Refer to ICL7611 for Singles) • Low Power Replacement for Many Standard Op Amps Applications • Portable Instruments • Telephone Headsets • Hearing Aid/Microphone Amplifiers • Meter Amplifiers • Medical Instruments • High Impedance Buffers Pinouts OUTA 1 -INA 2 +INA 3 V- 4 - + ICL7621 (PDIP, SOIC) TOP VIEW + Title CL76 , L76 The basic amplifier will operate at supply voltages ranging , from ±1V to ±8V, and may be operated from a single Lithium L76 cell. The output swing ranges to within a few millivolts of the supply voltages. ) ubThe quiescent supply current of these amplifiers is set to 100µA at the factory. This results in power consumption as ct ual/ low as 200µW per amplifier. uad, Of particular significance is the extremely low (1pA) input current, input noise current of 0.01pA/√Hz, and 1012Ω input w wer impedance. These features optimize performance in very MOS high source impedance applications. pera- The inputs are internally protected. Outputs are fully nal protected against short circuits to ground or to either supply. mpli- Because of the low power dissipation, junction temperature rise and drift are quite low. Applications utilizing these rs) utho features may include stable instruments, extended life designs, or high density packages. ) ey- Ordering Information TEMP. PKG. ords PART NUMBER RANGE (oC) PACKAGE NO. nterE8.3 ICL7621BCPA 0 to 70 8 Ld PDIP l B Grade - IQ = 100µA orpo- ICL7621DCPA E8.3 0 to 70 8 Ld PDIP D Grade - IQ = 100µA tion, M8.15 ICL7621DCBA 0 to 70 8 Ld SOIC miD Grade - IQ = 100µA nM8.15 ICL7621DCBA-T 0 to 70 8 Ld SOIC - D Grade Tape and Reel ctor, IQ = 100µA al, ad, eranal pli- • Wide Operating Voltage Range . . . . . . . . . . . ±1V to ±8V - 8 V+ 7 OUTB 6 -INB 5 +INB CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Americas Inc. | Copyright © Intersil Americas Inc. 2001 ICL7621 Absolute Maximum Ratings Thermal Information Supply Voltage V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . V- -0.3 to V+ +0.3V Differential Input Voltage (Note 1) . . . . . . . . . [(V+ +0.3) - (V- -0.3)]V Duration of Output Short Circuit (Note 2). . . . . . . . . . . . . . Unlimited Thermal Resistance (Typical, Note 3) Operating Conditions Temperature Range ICL7621C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC θJA ( oC/W) θJC (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . 120 N/A SOIC Package . . . . . . . . . . . . . . . . . . . 160 N/A Maximum Junction Temperature (Plastic Package) . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. Long term offset voltage stability will be degraded if large input differential voltages are applied for long periods of time. 2. The outputs may be shorted to ground or to either supply, for VSUPPLY ≤10V. Care must be taken to insure that the dissipation rating is not exceeded. 3. θJA is measured with the component mounted on an evaluation PC board in free air. VSUPPLY = ±5V, Unless Otherwise Specified Electrical Specifications ICL7621B PARAMETER SYMBOL Input Offset Voltage VOS TEST CONDITIONS R S ≤ 100kΩ ∆VOS/∆T R S ≤ 100kΩ Temperature Coefficient of VOS Input Offset Current IOS Input Bias Current IBIAS Common Mode Voltage Range VCMR IQ = 100µA Output Voltage Swing VOUT IQ = 100µA, RL = 100kΩ Large Signal Voltage Gain AVOL Unity Gain Bandwidth GBW Input Resistance VO = ±4.0V, R L = 100kΩ , IQ = 100µA IQ = 100µA RIN TEMP. (oC) MIN ICL7621D TYP MAX MIN TYP MAX UNITS 25 - - 5 - - 15 mV Full - - 7 - - 20 mV - - 15 - - 25 - µV/oC 25 - 0.5 30 - 0.5 30 pA 0 to 70 - - 300 - - 300 pA -55 to 125 - 800 - 800 pA 25 - 1.0 50 - 1.0 50 pA 0 to 70 - - 400 - - 400 pA -55 to 125 - - 4000 - - 4000 pA 25 ±4.2 - - ±4.2 - - V 25 ±4.9 - - ±4.9 - - V 0 to 70 ±4.8 - - ±4.8 - - V -55 to 125 ±4.5 - - ±4.5 - - V 25 80 102 - 80 102 - dB 0 to 70 75 - - 75 - - dB -55 to 125 68 - - 68 - - dB 25 - 0.48 - - 0.48 - MHz 25 - 1012 - - 1012 - Ω Common Mode Rejection Ratio CMRR RS ≤ 100kΩ , IQ = 100µA 25 70 91 - 70 91 - dB Power Supply Rejection Ratio (VSUPPLY = ±8V to ±2V) PSRR RS ≤ 100kΩ , IQ = 100µA 25 80 86 - 80 86 - dB Input Referred Noise Voltage eN RS = 100Ω, f = 1kHz 25 - 100 - - 100 - nV/√Hz iN Input Referred Noise Current RS = 100Ω, f = 1kHz 25 - 0.01 - - 0.01 - pA/√Hz Supply Current (Per Amplifier) ISUPPLY No Signal, No Load, IQ = 100µA 25 - 0.1 0.25 - 0.1 0.25 mA Channel Separation VO1/VO2 AV = 100 25 - 120 - - 120 - dB Slew Rate SR AV = 1, C L = 100pF, VIN = 8VP-P, IQ = 100µA, RL = 100kΩ 25 - 0.16 - - 0.16 - V/µs Rise Time tR VIN = 50mV, CL = 100pF, IQ = 100µA, RL = 100kΩ 25 - 2 - - 2 - µs Overshoot Factor OS VIN = 50mV, CL = 100pF, IQ = 100µA, RL = 100kΩ 25 - 10 - - 10 - % 2 ICL7621 Schematic Diagram IQ SETTING STAGE INPUT STAGE 3K C QP5 QP3 6.3V QP7 V- 100K QP2 V+ A 900K 3K QP1 OUTPUT STAGE QP8 QP6 QP4 V+ +INPUT QP9 QN1 QN2 CFF = 9pF OUTPUT VV+ CC = 33pF -INPUT QN9 QN7 QN4 V- QN10 QN6 QN5 TABLE OF JUMPERS ICL7621 C, E IQ 100µA QN11 6.3V V+ QN3 E QN8 G V- Application Information Static Protection Output Stage and Load Driving Considerations All devices are static protected by the use of input diodes. However, strong static fields should be avoided, as it is possible for the strong fields to cause degraded diode junction characteristics, which may result in increased input leakage currents. Each amplifiers’ quiescent current flows primarily in the output stage. This is approximately 70% of the IQ settings. This allows output swings to almost the supply rails for output loads of 1MΩ, 100kΩ, and 10kΩ, using the output stage in a highly linear class A mode. In this mode, crossover distortion is avoided and the voltage gain is maximized. However, the output stage can also be operated in Class AB for higher output currents. (See graphs under Typical Operating Characteristics). During the transition from Class A to Class B operation, the output transfer characteristic is nonlinear and the voltage gain decreases. Latchup Avoidance Junction-isolated CMOS circuits employ configurations which produce a parasitic 4-layer (PNPN) structure. The 4-layer structure has characteristics similar to an SCR, and under certain circumstances may be triggered into a low impedance state resulting in excessive supply current. To avoid this condition, no voltage greater than 0.3V beyond the supply rails may be applied to any pin. In general, the op amp supplies must be established simultaneously with, or before any input signals are applied. If this is not possible, the drive circuits must limit input current flow to 2mA to prevent latchup. Choosing the Proper IQ Each device in the ICL76XX family has a similar IQ setup scheme, which allows the amplifier to be set to nominal quiescent currents of 10µA, 100µA or 1mA. These current settings change only very slightly over the entire supply voltage range. The ICL7611/12 have an external IQ control terminal, permitting user selection of each amplifiers’ quiescent current. The ICL7621 has a fixed IQ setting of 100µA. 3 Frequency Compensation The ICL76XX are internally compensated, and are stable for closed loop gains as low as unity with capacitive loads up to 100pF. ICL7621 Typical Applications The user is cautioned that, due to extremely high input impedances, care must be exercised in layout, construction, board cleanliness, and supply filtering to avoid hum and noise pickup. +5 VIN +5 ICL76XX + VOUT VIN - ICL76XX - VOUT RL ≥ 10kΩ + 100kΩ TO CMOS OR LPTTL LOGIC 1MΩ FIGURE 1. SIMPLE FOLLOWER FIGURE 2. LEVEL DETECTOR - 1MΩ 1/2 ICL7621 + 1µF + 1MΩ - + 1MΩ VV+ DUTY CYCLE VOUT ICL76XX λ 1/2 ICL7621 + 680kΩ WAVEFORM GENERATOR NOTE: Since the output range swings exactly from rail to rail, frequency and duty cycle are virtually independent of power supply variations. NOTE: Low leakage currents allow integration times up to several hours. FIGURE 3. PHOTOCURRENT INTEGRATOR FIGURE 4. TRIANGLE/SQUARE WAVE GENERATOR 1MΩ +8V VOH 2.2MΩ 0.5µF VIN 10kΩ + 1/2 ICL7621 - 20kΩ 10µF 20kΩ 1.8k = 5% SCALE ADJUST TO SUCCEEDING INPUT STAGE VOL OUT - V- - 1/2 ICL7621 + COMMON FIGURE 5. AVERAGING AC TO DC CONVERTER FOR A/D CONVERTERS SUCH AS ICL7106, ICL7107, ICL7109, ICL7116, ICL7117 4 TA = 125oC + V+ V+ -8V FIGURE 6. BURN-IN AND LIFE TEST CIRCUIT ICL7621 0.2µF 0.2µF 30kΩ 0.2µF 160kΩ + 1/2 ICL7621 680kΩ 100kΩ 51kΩ + 1/2 ICL7621 - 360kΩ INPUT 0.1µF 0.2µF 360kΩ 1MΩ 0.1µF OUTPUT 1MΩ NOTE 4 NOTE 4 NOTES: 4. Small capacitors (25 - 50pF) may be needed for stability in some cases. 5. The low bias currents permit high resistance and low capacitance values to be used to achieve low frequency cutoff. fC = 10Hz, AVCL = 4, Passband ripple = 0.1dB. FIGURE 7. FIFTH ORDER CHEBYCHEV MULTIPLE FEEDBACK LOW PASS FILTER Typical Performance Curves 104 TA = 25 oC NO LOAD NO SIGNAL V+ - V- = 10V NO LOAD NO SIGNAL SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 10K 1K IQ = 100µA 100 10 1 0 2 4 6 8 10 SUPPLY VOLTAGE (V) 12 14 10 -25 0 25 50 75 100 125 FREE-AIR TEMPERATURE (oC) FIGURE 9. SUPPLY CURRENT PER AMPLIFIER vs FREE-AIR TEMPERATURE 1000 1000 DIFFERENTIAL VOLTAGE GAIN (kV/V) VS = ±5V INPUT BIAS CURRENT (pA) IQ = 100µA 102 1 -50 16 FIGURE 8. SUPPLY CURRENT PER AMPLIFIER vs SUPPLY VOLTAGE 100 10 1.0 0.1 -50 103 -25 0 25 50 75 FREE-AIR TEMPERATURE (oC) 100 FIGURE 10. INPUT BIAS CURRENT vs TEMPERATURE 5 125 VSUPPLY = 10V VOUT = 8V 100 R L = 100kΩ I Q = 100µA 10 1 -75 -50 -25 0 25 50 75 100 125 FREE-AIR TEMPERATURE (oC) FIGURE 11. LARGE SIGNAL DIFFERENTIAL VOLTAGE GAIN vs FREE-AIR TEMPERATURE ICL7621 Typical Performance Curves (Continued) COMMON MODE REJECTION RATIO (dB) TA = 25 oC VSUPPLY = 15V 106 105 104 IQ = 100µA 103 102 10 1 0.1 1.0 10 100 1K 10K FREQUENCY (Hz) 100K 1M SUPPLY VOLTAGE REJECTION RATIO (dB) FIGURE 12. LARGE SIGNAL FREQUENCY RESPONSE VSUPPLY = 10V 95 IQ = 100µA 85 80 75 70 65 -75 -50 -25 0 25 50 VSUPPLY = 10V 100 95 IQ = 100µA 90 85 80 75 70 -75 -50 -25 75 100 125 FIGURE 14. POWER SUPPLY REJECTION RATIO vs FREE-AIR TEMPERATURE 100 125 500 400 300 200 100 0 100 1K FREQUENCY (Hz) 10K 100K FIGURE 15. EQUIVALENT INPUT NOISE VOLTAGE vs FREQUENCY MAXIMUM OUTPUT SINK CURRENT (mA) MAXIMUM PEAK-TO-PEAK OUTPUT VOLTAGE (VP-P) IQ = 100µA 10 VSUPPLY = ±5V 6 4 0 100 75 0.01 TA = 25oC VSUPPLY = ±8V 12 2 50 TA = 25oC 3V ≤ VSUPPLY ≤ 16V 10 16 8 25 600 FREE-AIR TEMPERATURE (oC) 14 0 FIGURE 13. COMMON MODE REJECTION RATIO vs FREE-AIR TEMPERATURE 100 90 105 FREE-AIR TEMPERATURE (oC) EQUIVALENT INPUT NOISE VOLTAGE (nV/√Hz) DIFFERENTIAL VOLTAGE GAIN (V/V) 107 VSUPPLY = ±2V 1K 10K 100K FREQUENCY (Hz) 1M FIGURE 16. OUTPUT VOLTAGE vs FREQUENCY 6 10M 0.1 IQ = 100µA 1.0 10 0 2 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) FIGURE 17. OUTPUT SINK CURRENT vs SUPPLY VOLTAGE ICL7621 Typical Performance Curves (Continued) INPUT AND OUTPUT VOLTAGE (V) 8 6 TA = 25 oC, VSUPPLY = 10V RL = 100kΩ, C L = 100pF 4 2 OUTPUT 0 -2 INPUT -4 -6 0 20 40 60 80 100 120 TIME (µs) FIGURE 18. VOLTAGE FOLLOWER LARGE SIGNAL PULSE RESPONSE (IQ = 100µA) All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at website www.intersil.com/design/quality/iso.asp Intersil products are sold by description only. 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