CA3160A 데이터 시트보기 (PDF) - Intersil
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CA3160A Datasheet PDF : 17 Pages
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CA3160, CA3160A
input current to the less than one picoampere level can be
achieved as shown in Figure 23.
To further enhance the stability of this circuit, the CA3160
can be operated with its output (Terminal 6) near ground,
thus markedly reducing the dissipation by reducing the
supply current to the device.
The CA3140 stage serves as a X100 gain stage to provide
the required plus and minus output swing for the meter and
feedback network. A 100-to-1 voltage divider network
consisting of a 9.9kΩ resistor in series with a 100Ω resistor
sets the voltage at the 10GΩ resistor (in series with Terminal
3) to ±30mV full-scale deflection. This 30mV signal results
from ±3V appearing at the top of the voltage divider network
which also drives the meter circuitry.
By utilizing a switching technique in the meter circuit and in
the 9.9kΩ and 100Ω network similar to that used in voltmeter
circuit shown in Figure 8, a current range of 3pA to 1nA full
scale can be handled with the single 10GΩ resistor.
10MΩ
+15V
10GΩ
0.1µF
7
10pF
3+
CA3160
2-
4
5
1
100kΩ
6
10kΩ
560kΩ
9.1kΩ
-15V
STAIRCASE
OUTPUT
2V STEPS
COMPARATOR
OSCILLATOR
Top Trace: Staircase Output 2V Steps
Center Trace: Comparator
Bottom Trace: Oscillator
FIGURE 10B. STAIRCASE GENERATOR WAVEFORM
FIGURE 10. STAIRCASE GENERATOR CIRCUIT
1MΩ
+15V
7
2-
CA3140
3+
4
0.1µF
6
9.9kΩ
-15V
100Ω
5.6kΩ
500Ω
M 500-0-500µA
FIGURE 11. CURRENT-TO-VOLTAGE CONVERTER TO PROVIDE A PICOAMMETER WITH ±3pA FULL SCALE DEFLECTION
+15V
100kΩ
+15V
2200pF
1MΩ
30pF
7
3+
CA3160
2-
4
5
1
100kΩ
OFFSET
VOLTAGE
ADJUST
9.1kΩ
0.1µF
6
8
8.2kΩ
0.1µF
39kΩ
2
-
7
1N914 CA3080A
6
3+
4 100kΩ
0.1µF
5
27kΩ
DROOP
ZERO
ADJUST
500µA
1MΩ
39kΩ
8.2Ω
2
3
0.1µF
+15V
0.1µF
7
-
CA3140
6
+
4
STROBE INPUT
SAMPLE = 15V
2kΩ
HOLD = 0V
FIGURE 12A. SINGLE SUPPLY SAMPLE AND HOLD SYSTEM, INPUT 0V TO 10V
13
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