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DG442 データシートの表示(PDF) - Intersil

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DG442 Datasheet PDF : 14 Pages
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DG441, DG442
Test Circuits and Waveforms (Continued)
+15V
C V+
IMPEDANCE
ANALYZER
VS
INX 0V, 2.4V
f = 1MHz
VD
C
V-
GND
-15V
FIGURE 5. SOURCE/DRAIN CAPACITANCES TEST CIRCUIT
Application Information
GAIN ERROR IS DETERMINED ONLY BY THE RESISTOR TOLERANCE.
OP AMP OFFSET AND CMRR WILL LIMIT ACCURACY OF CIRCUIT.
+15V
FET INPUT 7 -15V
VIN
OP AMP 3 4
2
6
+15V
13
VOUT
GAIN1
AV = 1
GAIN2
AV = 10
GAIN3
AV = 20
GAIN4
AV = 100
2
1
15
16
10
9
7
8
V-
4
-15V
3
14
11
6
GND
5
R1
90kΩ
R2
5kΩ
R3
4kΩ
R4
1kΩ
V-----O----U----T--
VIN
=
R-----1----+-----R-----2----+-----R-----3----+-----R-----4-
R4
=
100
with SW4
closed
FIGURE 6. PRECISION WEIGHTED RESISTOR
PROGRAMMABLE GAIN AMPLIFIER
VIN
+-
INX
1 = SAMPLE
0 = HOLD
+15V
1/4 DG442
SX
DX
CH
+-
-15V
VOUT
FIGURE 7. OPEN LOOP SAMPLE AND HOLD
7
FN3281.10
November 20, 2006

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