參數(shù)資料
型號(hào)： CA5420AMZ
廠商： INTERSIL CORP
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： 0.5MHz, Low Supply Voltage, Low Input Current BiMOS Operational Amplifiers
中文描述： OP-AMP, 10000 uV OFFSET-MAX, 0.5 MHz BAND WIDTH, PDSO8
封裝： ROHS COMPLIANT, SOIC-8
文件頁(yè)數(shù)： 5/7頁(yè)
文件大?。?/td> 220K
代理商： CA5420AMZ
5
FN1925.5
December 21, 2005
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.
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
) 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
μ
A. At full-scale deflection this current
rises to 800
μ
A. Carbon-zinc battery life should be in excess
of 1,000 hours.
3
CA5420A
4
500-0-500
μ
A
7
+1.5V
5
1
2
-1.5V
10pF
10G
10M
1M
BATTERY
RETURNS
10k
6
M
±
50pA
±
15pA
±
5pA
±
1.5pA
11k
1.5k
1%
1.5k
1k
430
1%
150
1%
68
1%
-
+
FIGURE 1. PICOAMMETER CIRCUIT
2
CA5420A
-
4
500-0-500
μ
A
7
+1.5V
5
1
3
-1.5V
10M
22M
BATTERY
RETURNS
10k
6
M
±
500mV
±
150mV
±
50mV
±
15mV
1.1k
1.5k
1%
1.5k
1k
430
1%
150
1%
68
1%
+
100pF
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
R
L
= 100k
10
SUPPLY VOLTAGE (V)
15
T
A
= 25°C
-1.0
I
5
1
0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
P
V
O
+
V
ICR
-
V
ICR
+
V
O
-
V
+ = 2V
V
+ = 5V
V
+ = 10V
V
+ = 20V
10
1
0.1
0.001
LOAD (SOURCING) CURRENT (mA)
V- = 0V
T
A
= 25°C
1000
100
10
O
V
CA5420A
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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