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| ICL7621 Data Sheet May 2001 File Number 3403.4 Dual, Low Power CMOS Operational Amplifiers 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. Features * Wide Operating Voltage Range . . . . . . . . . . . 1V to 8V * High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 1012 * 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 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 100A at the factory. This results in power consumption as ct ual/ low as 200W per amplifier. uad, Of particular significance is the extremely low (1pA) input current, input noise current of 0.01pA/Hz, and 1012 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 = 100A orpo- ICL7621DCPA E8.3 0 to 70 8 Ld PDIP D Grade - IQ = 100A tion, M8.15 ICL7621DCBA 0 to 70 8 Ld SOIC miD Grade - IQ = 100A nM8.15 ICL7621DCBA-T 0 to 70 8 Ld SOIC - D Grade Tape and Reel ctor, IQ = 100A al, ad, eranal pli- Applications * Portable Instruments * Telephone Headsets * Hearing Aid/Microphone Amplifiers * Meter Amplifiers * Medical Instruments * High Impedance Buffers Pinouts OUTA -INA +INA V- ICL7621 (PDIP, SOIC) TOP VIEW 1 + 2 3 4 8 V+ OUTB -INB +INB - 7 - 6 5 + 1 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 (c) Intersil Americas Inc. 2001 ICL7621 Absolute Maximum Ratings 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 Information Thermal Resistance (Typical, Note 3) JA ( oC/W) JC (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) Operating Conditions Temperature Range ICL7621C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC 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. JA is measured with the component mounted on an evaluation PC board in free air. Electrical Specifications VSUPPLY = 5V, Unless Otherwise Specified ICL7621B PARAMETER Input Offset Voltage SYMBOL VOS TEST CONDITIONS R S 100k TEMP. (oC) 25 Full ICL7621D TYP MAX UNITS 25 0.5 15 20 30 300 800 1.0 102 0.48 1012 91 86 100 0.01 0.1 120 0.16 2 10 50 400 4000 0.25 mV mV V/oC pA pA pA pA pA pA V V V V dB dB dB MHz dB dB nV/Hz pA/Hz mA dB V/s s % MIN 4.2 4.9 4.8 4.5 80 75 68 70 80 - TYP MAX MIN 15 0.5 5 7 30 300 800 1.0 102 0.48 1012 91 86 100 0.01 0.1 120 0.16 2 10 50 400 4000 0.25 4.2 4.9 4.8 4.5 80 75 68 70 80 - Temperature Coefficient of VOS Input Offset Current VOS/T R S 100k IOS 25 0 to 70 -55 to 125 Input Bias Current IBIAS 25 0 to 70 -55 to 125 Common Mode Voltage Range Output Voltage Swing VCMR VOUT IQ = 100A IQ = 100A, RL = 100k 25 25 0 to 70 -55 to 125 Large Signal Voltage Gain AVOL VO = 4.0V, R L = 100k , IQ = 100A 25 0 to 70 -55 to 125 Unity Gain Bandwidth Input Resistance Common Mode Rejection Ratio Power Supply Rejection Ratio (VSUPPLY = 8V to 2V) Input Referred Noise Voltage Input Referred Noise Current Supply Current (Per Amplifier) Channel Separation Slew Rate Rise Time Overshoot Factor GBW RIN CMRR PSRR eN iN IQ = 100A RS 100k , IQ = 100A RS 100k , IQ = 100A RS = 100, f = 1kHz RS = 100, f = 1kHz 25 25 25 25 25 25 25 25 25 25 25 ISUPPLY No Signal, No Load, IQ = 100A VO1/VO2 AV = 100 SR tR OS AV = 1, C L = 100pF, VIN = 8VP-P, IQ = 100A, RL = 100k VIN = 50mV, CL = 100pF, IQ = 100A, RL = 100k VIN = 50mV, CL = 100pF, IQ = 100A, RL = 100k 2 ICL7621 Schematic Diagram IQ INPUT STAGE SETTING STAGE OUTPUT STAGE V+ 3K 3K 900K QP5 100K A C VQP6 QP4 QP9 QP7 QP8 6.3V QP1 V+ +INPUT QN1 QP2 QP3 QN2 CFF = 9pF OUTPUT CC = 33pF VV+ -INPUT QN7 VQN3 QN8 QN4 QN5 V+ E G VQN6 QN9 QN10 6.3V QN11 TABLE OF JUMPERS ICL7621 C, E IQ 100A Application Information Static Protection 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. Output Stage and Load Driving Considerations 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 1M, 100k, and 10k, 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. Frequency Compensation The ICL76XX are internally compensated, and are stable for closed loop gains as low as unity with capacitive loads up to 100pF. 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 10A, 100A 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 100A. 3 ICL7621 Typical Applications The user is cautioned that, due to extremely high input impedances, care must be exercised in layout, construction, VIN ICL76XX VOUT VIN 100k board cleanliness, and supply filtering to avoid hum and noise pickup. +5 + +5 + ICL76XX VOUT TO CMOS OR LPTTL LOGIC RL 10k 1M FIGURE 1. SIMPLE FOLLOWER FIGURE 2. LEVEL DETECTOR 1/2 ICL7621 1F + + 1M 1/2 ICL7621 + 1M ICL76XX VOUT + 1M VV+ DUTY CYCLE 680k WAVEFORM GENERATOR NOTE: Low leakage currents allow integration times up to several hours. FIGURE 3. PHOTOCURRENT INTEGRATOR 1M VOH 0.5F VIN 10k 2.2M + 1/2 ICL7621 20k TO SUCCEEDING INPUT STAGE NOTE: Since the output range swings exactly from rail to rail, frequency and duty cycle are virtually independent of power supply variations. FIGURE 4. TRIANGLE/SQUARE WAVE GENERATOR +8V 10F 1.8k = 5% SCALE ADJUST + V+ OUT TA = 125oC 20k - VOL - V- COMMON 1/2 ICL7621 + - V+ -8V FIGURE 5. AVERAGING AC TO DC CONVERTER FOR A/D CONVERTERS SUCH AS ICL7106, ICL7107, ICL7109, ICL7116, ICL7117 FIGURE 6. BURN-IN AND LIFE TEST CIRCUIT 4 ICL7621 0.2F 0.2F 0.2F 30k 160k + 1/2 ICL7621 680k 100k 51k + 1/2 ICL7621 360k INPUT 0.1F 0.2F 0.1F 1M OUTPUT 1M NOTE 4 360k 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 10K TA = 25 oC NO LOAD NO SIGNAL SUPPLY CURRENT (A) 104 V+ - V- = 10V NO LOAD NO SIGNAL 103 SUPPLY CURRENT (A) 1K IQ = 100A 100 102 IQ = 100A 10 10 1 0 2 4 6 8 10 SUPPLY VOLTAGE (V) 12 14 16 1 -50 -25 0 25 50 75 100 125 FREE-AIR TEMPERATURE (oC) FIGURE 8. SUPPLY CURRENT PER AMPLIFIER vs SUPPLY VOLTAGE 1000 DIFFERENTIAL VOLTAGE GAIN (kV/V) VS = 5V INPUT BIAS CURRENT (pA) FIGURE 9. SUPPLY CURRENT PER AMPLIFIER vs FREE-AIR TEMPERATURE 1000 VSUPPLY = 10V VOUT = 8V 100 100 R L = 100k I Q = 100A 10 10 1.0 0.1 -50 -25 0 25 50 75 FREE-AIR TEMPERATURE (oC) 100 125 1 -75 -50 -25 0 25 50 75 100 125 FREE-AIR TEMPERATURE (oC) FIGURE 10. INPUT BIAS CURRENT vs TEMPERATURE FIGURE 11. LARGE SIGNAL DIFFERENTIAL VOLTAGE GAIN vs FREE-AIR TEMPERATURE 5 ICL7621 Typical Performance Curves 107 DIFFERENTIAL VOLTAGE GAIN (V/V) 106 105 104 103 102 10 1 0.1 IQ = 100A TA = 25 oC VSUPPLY = 15V (Continued) COMMON MODE REJECTION RATIO (dB) 105 VSUPPLY = 10V 100 95 IQ = 100A 90 85 80 75 70 -75 1.0 10 100 1K 10K FREQUENCY (Hz) 100K 1M -50 -25 0 25 50 75 100 125 FREE-AIR TEMPERATURE (oC) FIGURE 12. LARGE SIGNAL FREQUENCY RESPONSE FIGURE 13. COMMON MODE REJECTION RATIO vs FREE-AIR TEMPERATURE EQUIVALENT INPUT NOISE VOLTAGE (nV/Hz) SUPPLY VOLTAGE REJECTION RATIO (dB) 100 VSUPPLY = 10V 95 90 85 80 75 70 65 -75 IQ = 100A 600 500 400 300 200 100 0 10 100 1K FREQUENCY (Hz) 10K 100K TA = 25oC 3V VSUPPLY 16V -50 -25 0 25 50 75 100 125 FREE-AIR TEMPERATURE (oC) FIGURE 14. POWER SUPPLY REJECTION RATIO vs FREE-AIR TEMPERATURE 16 14 MAXIMUM PEAK-TO-PEAK OUTPUT VOLTAGE (VP-P) 12 10 8 6 4 2 0 100 VSUPPLY = 2V VSUPPLY = 5V VSUPPLY = 8V FIGURE 15. EQUIVALENT INPUT NOISE VOLTAGE vs FREQUENCY 0.01 IQ = 100A MAXIMUM OUTPUT SINK CURRENT (mA) TA = 25oC 0.1 IQ = 100A 1.0 1K 10K 100K FREQUENCY (Hz) 1M 10M 10 0 2 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) FIGURE 16. OUTPUT VOLTAGE vs FREQUENCY FIGURE 17. OUTPUT SINK CURRENT vs SUPPLY VOLTAGE 6 ICL7621 Typical Performance Curves 8 INPUT AND OUTPUT VOLTAGE (V) 6 4 2 OUTPUT 0 -2 INPUT -4 -6 0 20 40 60 80 100 120 TIME (s) TA = 25 oC, VSUPPLY = 10V RL = 100k, C L = 100pF (Continued) FIGURE 18. VOLTAGE FOLLOWER LARGE SIGNAL PULSE RESPONSE (IQ = 100A) 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. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web site www.intersil.com Sales Office Headquarters NORTH AMERICA Intersil Corporation 2401 Palm Bay Rd. Palm Bay, FL 32905 TEL: (321) 724-7000 FAX: (321) 724-7240 EUROPE Intersil SA Mercure Center 100, Rue de la Fusee 1130 Brussels, Belgium TEL: (32) 2.724.2111 FAX: (32) 2.724.22.05 ASIA Intersil Ltd. 8F-2, 96, Sec. 1, Chien-kuo North, Taipei, Taiwan 104 Republic of China TEL: 886-2-2515-8508 FAX: 886-2-2515-8369 7 |
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