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CA3420EZ bảng dữ liệu(PDF) 3 Page - Intersil Corporation |
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CA3420EZ bảng dữ liệu(HTML) 3 Page - Intersil Corporation |
3 / 5 page 3 FN1320.9 October 4, 2005 Typical Applications Picoammeter Circuit The exceptionally low input current (typically 0.2pA) makes the CA3420 highly suited for use in a picoammeter circuit. With only a single 10G Ω 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 Ω resistor in series with the input. Higher current ranges require that this resistor be reduced. The 10M Ω resistor connected to pin 2 of the CA3420 decouples the potentially high input capacitance often associated with lower current circuits and reduces the tendency for the circuit to oscillate under these conditions. High Input Resistance Voltmeter Advantage is taken of the high input impedance of the CA3420 in a high input resistance DC voltmeter. Only two 1.5V “AA” type penlite batteries power this exceedingly high-input resistance (>1,000,000M Ω) 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 300 µA. At full-scale deflection this current rises to 800 µA. Carbon-zinc battery life should be in excess of 1,000 hours. Electrical Specifications For Equipment Design, at VSUPPLY = ±10V, TA = 25°C, Unless Otherwise Specified PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Input Offset Voltage |VIO| - 5 10 mV Input Offset Current (Note 4) |IIO| - 0.03 4 pA Input Current (Note 4) |II| - 0.05 5 pA Large Signal Voltage Gain AOL RL = 10kΩ 10 100 - kV/V 80 100 - dB Common Mode Rejection Ratio CMRR - 100 320 µV/V 70 80 - dB Common Mode Input Voltage Range VlCR+8.5 9.3 - V VlCR- -10 -10.3 - V Power Supply Rejection Ratio PSRR ∆VIO/∆V - 32 320 µV/V 70 90 - dB Max Output Voltage VOM+RL = ∞ 9.7 9.9 - V VOM- -9.7 -9.85 - V Supply Current I+ - 450 1000 µA Device Dissipation PD -9 14 mW Input Offset Voltage Temperature Drift ∆VlO/∆T- 4 - µV/°C NOTE: 4. The maximum limit represents the levels obtainable on high speed automatic test equipment. Typical values are obtained under laboratory conditions. 3 CA3420 4 500-0-500 7 +1.5V 5 1 2 -1.5V 10pF 10G Ω 10M Ω 1M Ω BATTERY RETURNS 10k Ω 6 M µA ±50pA ±15pA ±5pA ±1.5pA 11k Ω 1.5k Ω, 1% 1.5k Ω 1k Ω 430 Ω, 1% 150 Ω, 1% 68 Ω 1% - + FIGURE 1. PICOAMMETER CIRCUIT 2 CA3420 4 500-0-500 7 +1.5V 5 1 3 -1.5V 10M Ω 22M Ω BATTERY RETURNS 10k Ω 6 M µA ±500mV ±150mV ±50mV ±15mV 1.1k Ω 1.5k Ω, 1% 1.5k Ω 1k Ω 430 Ω, 1% 150 Ω, 1% 68 Ω 1% - + 100pF FIGURE 2. HIGH INPUT RESISTANCE VOLTMETER CA3420 |
Số phần tương tự - CA3420EZ |
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Mô tả tương tự - CA3420EZ |
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