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| CA5420A Data Sheet September 1998 File Number 1925.4 0.5MHz, Low Supply Voltage, Low Input Current BiMOS Operational Amplifiers The CA5420A is an integrated circuit operational amplifier that combines PMOS transistors and bipolar transistors on a single monolithic chip. It is designed and guaranteed to operate in microprocessor logic systems that use V+ = 5V, V- = GND, since it can operate down to 1V supplies. It will also be suitable for 3.3V logic systems. The CA5420A BiMOS operational amplifier features gateprotected PMOS transistors in the input circuit to provide very high input impedance, very low input currents (less than 1pA). The internal bootstrapping network features a unique guardbanding technique for reducing the doubling of leakage current for every 10oC increase in temperature. The CA5420A operates at total supply voltages from 2V to 20V either single or dual supply. This operational amplifier is internally phase compensated to achieve stable operation in the unity gain follower configuration. Additionally, it has access terminals for a supplementary external capacitor if additional frequency roll-off is desired. Terminals are also provided for use in applications requiring input offset voltage nulling. The use of PMOS in the input stage results in common-mode input voltage capability down to 0.45V below the negative supply terminal, an important attribute for single supply application. The output stage uses a feedback OTA type amplifier that can swing essentially from rail-to-rail. The output driving current of 1.0mA (Min) is provided by using nonlinear current mirrors. This device has guaranteed specifications for 5V operation over the full military temperature range of -55oC to 125oC. The CA5420A has the same 8 lead pinout used for the industry standard 741. Features * CA5420A at 5V Supply Voltage with Full Military Temperature Range Guaranteed Specifications * CA5420A Guaranteed to Operate from 1V to 10V Supplies * 2V Supply at 300A Supply Current * 1pA (Typ) Input Current (Essentially Constant to 85oC) * Rail-to-Rail Output Swing (Drive 2mA Into 1k Load) * Pin Compatible with 741 Op Amp Applications * pH Probe Amplifiers * Picoammeters * Electrometer (High Z) Instruments * Portable Equipment * Inaccessible Field Equipment * Battery Dependent Equipment (Medical and Military) * 5V Logic Systems * Microprocessor Interface Ordering Information PART NUMBER (BRAND) CA5420AM (5420A) TEMP. RANGE (oC) -55 to 125 PACKAGE 8 Ld SOIC PKG. NO. M8.15 Pinout CA5420A (SOIC) TOP VIEW OFFSET 1 NULL INV. 2 INPUT Functional Diagram 8 STROBE X1 + 7 V+ 6 OUTPUT 5 OFFSET NULL MOS BIPOLAR + MOS BIPOLAR NON-INV. 3 INPUT V- 4 NOTE: Pin is connected to Case. X1 BUFFER AMPS; BOOTSTRAPPED INPUT PROTECTION NETWORK HIGH GAIN (50K) OTA BUFFER (X2) 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Copyright (c) Intersil Corporation 1999 CA5420A Absolute Maximum Ratings Supply Voltage (Between V+ and V- Terminals) . . . . . . . . . . . . 22V Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . (V+ + 8V) to (V- -0.5V) Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA Output Short Circuit Duration (Note 1). . . . . . . . . . . . . . . . Indefinite Thermal Information Thermal Resistance (Typical, Note 2) JA (oC/W) JC (oC/W) SOIC Package . . . . . . . . . . . . . . . . . . . 157 N/A Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range (All Types) . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC 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. Short circuit may be applied to ground or to either supply. 2. JA is measured with the component mounted on an evaluation PC board in free air. Electrical Specifications PARAMETER Input Resistance Input Capacitance Output Resistance Equivalent Input Noise Voltage Short-Circuit Current To Opposite Supply Gain Bandwidth Product Slew Rate Transient Response Typical Values Intended Only for Design Guidance. V+ = +5V; V- = GND, TA = 25oC SYMBOL RI CI RO eN f = 1kHz f = 10kHz Source Sink IOM+ IOMfT SR Rise Time Overshoot tr OS I8+ I80.01% 0.10% AV = 1 AV = 1 2VP-P Input 2VP-P Input RL = 2k, CL = 100pF RS = 100 TEST CONDITIONS CA5420A 150 4.9 300 62 38 2.6 2.4 0.5 0.5 0.7 15 20 2 8 4.5 UNITS T pF nV/Hz nV/Hz mA mA MHz V/s s % A mA s s Current from Terminal 8 To VCurrent from Terminal 8 To V+ Settling Time Electrical Specifications PARAMETER Input Offset Voltage Input Offset Current Input Current Common Mode Rejection Ratio TA = 25oC, V+ = 5V, V- = 0, Unless Otherwise Specified TEST CONDITIONS VO = 2.5V VO = 2.5V VO = 2.5V VCM = 0 to 3.7V, VO = 2.5V VO = 2.5V V+ = 1V; V- = 1V RL = RL = 10k RL = 2k CA5420A MIN 75 3.7 75 TYP 1 0.02 0.02 83 4 -0.3 83 MAX 5 0.5 1 0 UNITS mV pA pA dB V V dB SYMBOL VIO IIO II CMRR VlCR+ VlCR- Common Mode Input Voltage Range Power Supply Rejection Ratio Large Signal Voltage Gain VO = 0.5 to 4V VO = 0.5 to 4V VO = 0.7 to 3V PSRR AOL 85 85 80 87 87 85 - dB dB dB 2 CA5420A Electrical Specifications PARAMETER Source Current Sink Current Output Voltage TA = 25oC, V+ = 5V, V- = 0, Unless Otherwise Specified (Continued) TEST CONDITIONS VO = 0V VO = 5V RL = CA5420A MIN 1.2 1.2 4.9 RL = 10k 4.7 RL = 2k 3.5 VO = 0V VO = 2.5V TYP 2.7 2.1 4.94 0.13 4.9 0.12 4.6 0.1 400 430 MAX 0.15 0.15 0.15 500 550 UNITS mA mA V V V V V V A A SYMBOL ISOURCE ISINK VOM+ VOMVOM+ VOMVOM+ VOM- Supply Current ISUPPLY Electrical Specifications PARAMETER Input Offset Voltage Input Offset Current Up to TA = 85oC Input Current Up to TA = 85oC Common Mode Rejection Ratio TA = -55oC to 125oC, V+ = 5V, V- = 0, Unless Otherwise Specified TEST CONDITIONS VO = 2.5V VO = 2.5V CA5420A MIN |II| VO = 2.5V CMRR VlCR+ VlCRVCM = 0 to 3.7V, VO = 2.5V VO = 2.5V V+ = 1V; V- = 1V RL = RL = 10k RL = 2k ISOURCE ISINK VOM+ VOMVOM+ VOMVOM+ VOMRL = 2k RL = 10k VO = 0V VO = 5V RL = 70 3.7 70 TYP 2 1.5 2 2 10 80 4 -0.3 83 MAX 10 3 10 5 15 0 UNITS mV nA pA nA pA dB V V dB SYMBOL VIO IIO Common Mode Input Voltage Range Power Supply Rejection Ratio Large Signal Voltage Gain VO = 0.5 to 4V VO = 0.7 to 4V VO = 0.7 to 2.5V Source Current Sink Current Output Voltage PSRR AOL 85 80 75 1 1 4.8 4.7 3 - 87 87 80 2.7 2.1 4.9 0.16 4.9 0.15 4 0.14 430 480 0.2 0.2 0.2 550 600 dB dB dB mA mA V V V V V V A A Supply Current ISUPPLY VO = 0V VO = 2.5V - 3 CA5420A Electrical Specifications PARAMETER Input Offset Voltage Input Offset Current Input Current Large Signal Voltage Gain For Equipment Design at VSUPPLY = 1V, TA = 25oC, Unless Otherwise Specified TEST CONDITIONS CA5420A MIN RL = 10k 20 86 Common Mode Rejection Ratio CMRR 60 Common Mode Input Voltage Range VlCR+ VlCRPower Supply Rejection Ratio PSRR RL = 0.2 -1 70 Maximum Output Voltage VOM+ VOMSupply Current Device Dissipation Input Offset Voltage Temp. Drift ISUPPLY PD VIO/T 0.9 -0.85 TYP 2 0.01 0.02 100 100 560 65 0.5 -1.3 32 90 0.95 -0.91 350 0.7 4 MAX 5 4 (Note 3) 5 (Note 3) 1000 320 650 1.1 UNITS mV pA pA kV/V dB V/V dB V V V/V dB V V A mW V/oC SYMBOL VIO |IIO| |II| AOL Electrical Specifications PARAMETER Input Offset Voltage Input Offset Current Input Current Large Signal Voltage Gain For Equipment Design at VSUPPLY = 10V, TA = 25oC, Unless Otherwise Specified TEST CONDITIONS CA5420A MIN RL = 10k 20 86 TYP 2 0.03 0.05 100 100 100 80 9.3 -10.3 32 90 9.9 -9.85 450 9 4 MAX 5 4 (Note 3) 5 (Note 3) 320 320 1000 14 UNITS mV pA pA kV/V dB V/V dB V V V/V dB V V A mW V/oC SYMBOL VIO |IIO| |II| AOL Common Mode Rejection Ratio CMRR 70 Common Mode Input Voltage Range VlCR+ VlCR- 9 -10 70 RL = Power Supply Rejection Ratio PSRR Maximum Output Voltage VOM+ VOM- 9.7 -9.7 - Supply Current Device Dissipation Input Offset Voltage Temperature Drift NOTE: ISUPPLY PD VIO/T 3. The maximum limit represents the levels obtainable on high-speed automatic test equipment. Typical values are obtained under laboratory conditions. 4 CA5420A Typical Applications Picoammeter Circuit The exceptionally low input current (typically 0.2pA) makes the CA5420A highly suited for use in a picoammeter circuit. With only a single 10G resistor, this circuit covers the range from 1.5pA. Higher current ranges are possible with suitable switching techniques and current scaling resistors. Input transient protection is provided by the 1M resistor in series with the input. Higher current ranges require that this resistor be reduced. The 10M resistor connected to pin 2 of the CA5420A decouples the potentially high input capacitance often associated with lower current circuits and reduces the tendency for the circuit to oscillate under these conditions. 10G High Input Resistance Voltmeter Advantage is taken of the high input impedance of the CA5420A in a high input resistance DC voltmeter. Only two 1.5V "AA" type penlite batteries power this exceedingly highinput resistance (>1,000,000M) DC voltmeter. Full-scale deflection is 500mV, 150mV, and 15mV. Higher voltage ranges are easily added with external input voltage attenuator networks. The meter is placed in series with the gain network, thus eliminating the meter temperature coefficient error term. Supply current in the standby position with the meter undeflected is 300A. At full-scale deflection this current rises to 800A. Carbon-zinc battery life should be in excess of 1,000 hours. +1.5V 500-0-500 A 6 M 50pA BATTERY RETURNS 1.5k 1.5k 1% 1k 430 1% -1.5V 1.5pA 150 1% 15mV 150 1% 3 22M 10M 100pF 2 + 7 6 500-0-500 A M 500mV BATTERY RETURNS 1.5k 1.5k 1% 1k 430 1% 10pF 2 1M 10M 3 +1.5V 7 + 5 1 CA5420A 4 CA5420A 5 1 4 10k 15pA 5pA 10k 150mV 50mV -1.5V 11k 68 1% 1.1k 68 1% FIGURE 1. PICOAMMETER CIRCUIT FIGURE 2. HIGH INPUT RESISTANCE VOLTMETER Typical Performance Curves INPUT & OUTPUT VOLTAGE EXCURSIONS FROM THE POSITIVE AND NEGATIVE SUPPLY VOLTAGE (V) OUTPUT STAGE TRANSISTOR SATURATION VOLTAGE, Q19 (mV) 10 1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 1 5 10 SUPPLY VOLTAGE (V) 15 VO+ VICRVICR+ VOTA = 25oC V- = 0V TA = 25oC RL = 100k V+ = 2V V+ = 5V V+ = 10V 100 V+ = 20V 1000 0.001 0.1 1 LOAD (SOURCING) CURRENT (mA) 10 FIGURE 3. OUTPUT VOLTAGE SWING AND COMMON MODE INPUT VOLTAGE RANGE vs SUPPLY VOLTAGE FIGURE 4. OUTPUT VOLTAGE vs LOAD SOURCING CURRENT 5 CA5420A Typical Performance Curves OUTPUT STAGE TRANSISTOR SATURATION VOLTAGE, Q17 (mV) 1000 TA = 25oC V+ = 0V SUPPLY CURRENT (A) 2400 2000 1600 1200 800 400 10 0.01 0.1 1 LOAD (SINKING) CURRENT (mA) 10 (Continued) V+ = 5V V- = GND 100 V- = -20V V- = -10V V- = -5V V- = -2V 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 FIGURE 5. OUTPUT VOLTAGE vs LOAD SINKING CURRENT 5.00 OUTPUT VOLTAGE SWING (V) FIGURE 6. SUPPLY CURRENT vs OUTPUT VOLTAGE 800 700 INPUT BIAS CURRENT (pA) 600 500 400 300 200 100 V+ = 5V V- = GND 3.75 TA = 25oC V+ = 5V V- = GND RL TO GND 2.50 1.25 0 0 1 10 100 LOAD RESISTANCE (k) 1000 0 25 35 45 55 65 75 85 95 TEMPERATURE (oC) 105 115 125 FIGURE 7. OUTPUT VOLTAGE SWING vs LOAD RESISTANCE FIGURE 8. INPUT BIAS CURRENT DRIFT (IB/T) EQUIVALENT INPUT NOISE VOLTAGE (nVHz) 1000 VS = 10V VS = 5V VS = 1V 100 TA = 25oC OPEN LOOP VOLTAGE GAIN (dB) 100 0 -45 -90 80 60 -135 -180 101 40 20 1 101 0 102 103 104 105 106 1 FREQUENCY (Hz) 101 102 103 104 105 106 FREQUENCY (Hz) FIGURE 9. INPUT NOISE VOLTAGE vs FREQUENCY FIGURE 10. OPEN LOOP GAIN AND PHASE SHIFT RESPONSE 6 OPEN LOOP PHASE (DEGREES) TA = 25oC V+ = +10V, V- = 10V RL = 10k CL = 0pF CA5420A All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil semiconductor 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 P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 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 (Taiwan) Ltd. 7F-6, No. 101 Fu Hsing North Road Taipei, Taiwan Republic of China TEL: (886) 2 2716 9310 FAX: (886) 2 2715 3029 7 |
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