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參數(shù)資料
| 型號： | AD704KN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | MB 15C 14#20 1#16 SKT PLUG |
| 中文描述： | QUAD OP-AMP, 150 uV OFFSET-MAX, 0.8 MHz BAND WIDTH, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 397K |
| 代理商： | AD704KN |
AD704
REV. A
–7–
__
R1
___
RG
INSTRUMENTATION AMPLIFIER GAIN = 1 +R2
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
0.01
μ
F
C6
R11
2M
OUTPUT
C3
1M
R9
C4
1M
R8
0.01
μ
F
C5
C2
1M
R7
1M
R6
C1
0.1
μ
F
+V
S
0.1
μ
F
–V
S
GAIN TRIM
(500k POT)
49.9k
R2
6.34k
R1
6.34k
R3
OPTIONAL
AC CMRR TRIM
2.4k
R5
47.5k
R4
DC
CMRR
TRIM
(5k POT)
Ct
G
R
+V
IN
–V
IN
=
____1
R8 C3C4
R8 = R9
Q =
C34
R6 = R7
=
____1
R6 C1C2
Q =
1
ω
C12
R10
2M
ω
Figure 24. Gain of 10 Instrumentation Amplifier with Post Filtering
The instrumentation amplifier with post filtering (Figure 24)
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
contribution as encountered in a 3 op amp design. Good low
frequency CMRR is achieved even without the optional AC
CMRR trim (Figure 25
).
Table I provides resistance values for
3 common circuit gains. For other gains, use the following
equations:
R
2
= R
4 +
R
5
=
49.9
k
R
1
=
R
3
=
49.9
k
0.9
G
1
Max Value of R
G
=
99.8
k
0.06
G
C
t
≈
1
2
π
(
R
3)5
×
10
5
Table I. Resistance Values for Various Gains
Circuit Gain
(G)
R
G
(Max Value
of Trim Potentiometer)
Bandwidth
(–3 dB), Hz
R1 & R3
10
100
1,000
6.34 k
526
56.2
166 k
16.6 k
1.66 k
50k
5k
0.5k
160
140
120
100
80
60
40
20
0
1
10
100
1k
10k
FREQUENCY – Hz
C
GAIN = 10, 0.2V p-p COMMON-MODE INPUT
TYPICAL MONOLITHIC IN AMP
CIRCUIT TRIMMED
USING CAPACITOR Ct
WITHOUT CAPACITOR Ct
Figure 25. Common-Mode Rejection vs. Frequency with
and without Capacitor C
t
10
0%
50μs
2V
100
90
Figure 23b. Unity Gain Inverter
Large Signal Pulse Response,
C
L
= 1,000 pF
10
0%
5μS
20mV
100
90
Figure 23c. Unity Gain Inverter
Small Signal Pulse Response,
C
L
= 100 pF
10
0%
5μS
20mV
100
90
Figure 23d. Unity Gain Inverter Small
Signal Pulse Response, C
L
= 1,000 pF
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