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CA5420AM датащи(PDF) 6 Page - Intersil Corporation |
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CA5420AM датащи(HTML) 6 Page - Intersil Corporation |
6 / 8 page 6 FN1925.6 December 8, 2009 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 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 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. 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 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 co-efficient error term. Supply current in the standby position with the meter undeflected is 300µA. At full-scale deflection this current rises to 800µA. Carbon-zinc battery life should be in excess of 1,000 hours. 3 CA5420A 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 µ A ±50pA ±15pA ±5pA ±1.5pA 11k Ω 1.5k Ω 1.5k Ω 1k Ω 430 Ω 150 Ω 68 Ω 1% - + 1% 1% 1% FIGURE 1. PICOAMMETER CIRCUIT 2 CA5420A 4 500-0-500 7 +1.5V 5 1 3 -1.5V 10M Ω 22M Ω BATTERY RETURNS 10k Ω 6 M µ A ±500mV ±150mV ±50mV ±15mV 1.1k Ω 1.5k Ω 1.5k Ω 1k Ω 430 Ω 150 Ω 68 Ω 1% - + 100pF 1% 1% 1% FIGURE 2. HIGH INPUT RESISTANCE VOLTMETER Typical Performance Curves FIGURE 3. OUTPUT VOLTAGE SWING AND COMMON MODE INPUT VOLTAGE RANGE vs SUPPLY VOLTAGE FIGURE 4. OUTPUT VOLTAGE vs LOAD SOURCING CURRENT RL = 100kΩ 10 SUPPLY VOLTAGE (V) 15 TA = +25°C -1.0 5 1 0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 VO+ VICR- VICR+ VO- V + = 5V 10 1 0.1 0.001 LOAD (SOURCING) CURRENT (mA) V- = 0V TA = +25°C 1000 100 10 V + = 20V V + = 10V V + = 2V CA5420A |
Аналогичный номер детали - CA5420AM |
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Аналогичное описание - CA5420AM |
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