参数资料
型号: AD648KNZ
厂商: Analog Devices Inc
文件页数: 2/12页
文件大小: 0K
描述: IC OPAMP BIFET 1MHZ DUAL LP 8DIP
标准包装: 50
放大器类型: J-FET
电路数: 2
转换速率: 1.8 V/µs
增益带宽积: 1MHz
电流 - 输入偏压: 3pA
电压 - 输入偏移: 300µV
电流 - 电源: 340µA
电流 - 输出 / 通道: 15mA
电压 - 电源,单路/双路(±): ±4.5 V ~ 18 V
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
产品目录页面: 773 (CN2011-ZH PDF)
AD648
REV. E
–10–
INSTRUMENTATION AMPLIFIER
The AD648J’s maximum input current of 20 pA per amplifier
makes it an excellent building block for the high input impedance
instrumentation amplifier shown in Figure 29. Total current
drain for this circuit is under 600
A. This configuration is
optimal for conditioning differential voltages from high imped-
ance sources.
The overall gain of the circuit is controlled by RG, resulting in
the following transfer function:
VOUT
VIN
= 1+
( R3
+ R4)
RG
Gains of 1 to 100 can be accommodated with gain nonlinearities
of less than 0.01%. The maximum input current is 30 pA over
the common-mode range, with a common-mode impedance of
over 1
× 1012 . The capacitors C1, C2, C3 and C4 compensate
for peaking in the gain over frequency which is caused by input
capacitance.
To calibrate this circuit, first adjust trimmer R1 for common-
mode rejection with 10 V dc applied to the input pins. Next,
adjust R2 for zero offset at VOUT with both inputs grounded.
Trim the circuit a second time for optimal
performance.
The –3 dB small signal bandwidth for this low power instru-
mentation amplifier is 700 kHz for a gain of 1 and 10 kHz for a
gain of 100. The typical output slew rate is 1.8 V/
s.
Figure 29. Low Power Instrumentation Amplifier
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