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| 型号： | AD704JRZ-16-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP QUAD PREC LN 16SOIC |
| 标准包装： | 1 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 转换速率： | 0.15 V/µs |
| -3db带宽： | 800kHz |
| 电流 - 输入偏压： | 100pA |
| 电压 - 输入偏移： | 50µV |
| 电流 - 电源： | 1.5mA |
| 电流 - 输出 / 通道： | 15mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 标准包装 |
| 其它名称： | AD704JRZ-16-REELDKR |
AD704
Rev. E | Page 11 of 16
THEORY OF OPERATION
–VIN
+VIN
OUTPUT
+VS
0.1F
–VS
0.1F
Ct
C2
C1
R3
6.34k
RG
GAIN TRIM
(500k
POT)
R4
47.5k
R5
2.4k
R1
6.34k
R2
49.9k
R6
1M
R10, 2M
C5, 0.01F
R7
1M
R8
1M
1/4
AD704
1/4
AD704
1/4
AD704
C4
C3
R11, 2M
C6, 0.01F
R9
1M
1/4
AD704
DC
CMRR
TRIM
(5k
POT)
OPTIONAL
AC CMRR TRIM
OPTIONAL BALANCE RESISTOR NETWORKS
CAN BE REPLACED WITH A SHORT.
NOTES
1. INSTRUMENTATION AMPLIFIER GAIN = 1 +
+
(FOR R1 = R3, R2 = R4 + R5).
2. CAPACITORS C2 AND C4 ARE SOUTHERN ELECTRONICS MPCC, POLYCARBONATE, ±5%, 50V.
3. ALL RESISTORS METAL FILM, 1%.
R2
R1
2R2
RG
Q1 =
C1
4C2
ω =
1
R6 C1C2
R6 = R7
Q2 =
C3
4C4
ω =
1
R8 C3C4
R8 = R9
00818-
034
Figure 34. Gain-of-10 Instrumentation Amplifier with Post Filtering
The instrumentation amplifier with post filtering (see Figure 34)
combines two applications that 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 operates
for gains that are G ≥ 2 and, at lower gains, it benefits from no
output amplifier offset and no noise contribution as encountered
in a 3-op-amp design. Good low frequency CMRR is achieved
even without the optional ac CMRR trim (see Figure 35). Table 4
provides resistance values for three common circuit gains. For
other gains, use the following equations:
5
10
5
)
(
π
2
1
06
.
0
k
8
.
99
1
9
.
0
k
9
.
49
k
9
.
49
×
≈
=
=
=
+
=
R3
C
G
R
of
Value
Max
G
R3
R1
R5
R4
R2
t
G
Table 4. Resistance Values for Various Gains
Circuit
Gain (G)
R1 and R3
RG (Max Value of
Trim Potentiometer)
Bandwidth
(3 dB), Hz
10
6.34 k
166 k
50 k
100
526
16.6 k
5k
1000
56.2
1.66 k
0.5 k
160
140
120
100
80
60
40
20
0
1
10
100
1k
10k
FREQUENCY (Hz)
CO
M
O
N-
M
O
DE
RE
JE
CT
IO
N
(
d
B)
GAIN = 10, 0.2V p-p COMMON-MODE INPUT
TYPICAL MONOLITHIC IN AMP
WITHOUT CAPACITOR Ct
CIRCUIT TRIMMED
USING CAPACITOR Ct
00818-
035
Figure 35. Common-Mode Rejection vs. Frequency with and Without
Capacitor Ct
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