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AD704JR Arkusz danych(PDF) 8 Page - Analog Devices

Numer części AD704JR
Szczegółowy opis  Quad Picoampere Input Current Bipolar Op Amp
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Strona internetowa  http://www.analog.com
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AD704JR Arkusz danych(HTML) 8 Page - Analog Devices

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REV. C
AD704
–8–
Table I. Resistance Values for Various Gains
Circuit Gain
RG (Max Value
Bandwidth
(G)
R1 and R3
of Trim Potentiometer) (–3 dB), Hz
10
6.34 k
166 k
50k
100
526
16.6 k
5k
1,000
56.2
1.66 k
0.5k
160
140
120
100
80
60
40
20
0
1
10
100
1k
10k
FREQUENCY – Hz
GAIN = 10, 0.2V p-p COMMON-MODE INPUT
CIRCUIT TRIMMED
USING CAPACITOR Ct
WITHOUT CAPACITOR Ct
TYPICAL MONOLITHIC IN AMP
Figure 4. Common-Mode Rejection vs. Frequency with
and without Capacitor Ct
INSTRUMENTATION AMPLIFIER GAIN = 1 +
+
(FOR R1 = R3, R2 = R4 + R5)
R2
2R2
ALL RESISTORS METAL FILM, 1%
1/4
AD704
1/4
AD704
1/4
AD704
1/4
AD704
OPTIONAL BALANCE RESISTOR
NETWORKS CAN BE REPLACED
WITH A SHORT
CAPACITORS C2 AND C4 ARE
SOUTHERN ELECTRONICS MPCC,
POLYCARBONATE, 5%, 50 VOLT
OUTPUT
C3
C4
R8
1M
C5, 0.01 F
C2
R7
1M
R6
1M
C1
0.1 F
GAIN TRIM
(500k
POT)
R2
49.9k
R1
6.34k
RG
R3
6.34k
OPTIONAL
AC CMRR TRIM
R5
2.4k
R4
47.5k
DC
CMRR
TRIM
(5k
POT)
C t
–VIN
R1
RG
=
R8
C3C4
ω
1
R8 = R9
Q2 =
C3
4C4
R6 = R7
=
R6
C1C2
ω
1
Q1 =
C1
4C2
R10, 2M
+
+
0.1 F
+VS
–VS
+VIN
R9
1M
C6, 0.01 F
R11, 2M
Figure 3. Gain of 10 Instrumentation Amplifier with Post Filtering
The instrumentation amplifier with post filtering (Figure 3)
combines two applications which benefit greatly from the
AD704. This circuit achieves low power and dc precision over
temperature with a minimum of components.
The instrumentation amplifier circuit offers many performance
benefits including BiFET level input bias currents, low input
offset voltage drift and only 1.2 mA quiescent current. It will
operate for gains G
≥ 2, and at lower gains it will benefit from
the fact that there is no output amplifier offset and noise contri-
bution as encountered in a 3 op amp design. Good low frequency
CMRR is achieved even without the optional ac CMRR trim
(Figure 4). Table I provides resistance values for 3 common
circuit gains. For other gains, use the following equations:
R2 = R4 + R5 = 49.9 k
R1
= R3 =
49.9 k
0.9 G
−1
Max Value of R
k
G
G
=
99 8
006
.
.
C
t
1
2
π (R3) 5 × 105


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