参数资料
型号: AD627AR
厂商: Analog Devices Inc
文件页数: 7/25页
文件大小: 0K
描述: IC AMP INST R-R 25MA 8SOIC
标准包装: 98
放大器类型: 仪表
电路数: 1
输出类型: 满摆幅
转换速率: 0.06 V/µs
-3db带宽: 80kHz
电流 - 输入偏压: 2nA
电压 - 输入偏移: 25µV
电流 - 电源: 60µA
电流 - 输出 / 通道: 25mA
电压 - 电源,单路/双路(±): 2.2 V ~ 36 V,±1.1 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 管件
AD627
Data Sheet
Rev. E | Page 14 of 24
THEORY OF OPERATION
The AD627 is a true instrumentation amplifier, built using two
feedback loops. Its general properties are similar to those of the
classic two-op-amp instrumentation amplifier configuration but
internally the details are somewhat different. The AD627 uses a
modified current feedback scheme, which, coupled with interstage
feedforward frequency compensation, results in a much better
common-mode rejection ratio (CMRR) at frequencies above
dc (notably the line frequency of 50 Hz to 60 Hz) than might
otherwise be expected of a low power instrumentation amplifier.
In Figure 35, A1 completes a feedback loop that, in conjunction
with V1 and R5, forces a constant collector current in Q1. Assume
that the gain-setting resistor (RG) is not present. Resistors R2
and R1 complete the loop and force the output of A1 to be equal
to the voltage on the inverting terminal with a gain of nearly
1.25. A2 completes a nearly identical feedback loop that forces
a current in Q2 that is nearly identical to that in Q1; A2 also
provides the output voltage. When both loops are balanced, the
gain from the noninverting terminal to VOUT is equal to 5,
whereas the gain from the output of A1 to VOUT is equal to 4.
The inverting terminal gain of A1 (1.25) times the gain of A2
(4) makes the gain from the inverting and noninverting
terminals equal.
The differential mode gain is equal to 1 + R4/R3, nominally 5,
and is factory trimmed to 0.01% final accuracy. Adding an
external gain setting resistor (RG) increases the gain by an
amount equal to (R4 + R1)/RG. The output voltage of the
AD627 is given by
VOUT = [VIN(+) – VIN()] × (5 + 200 k/RG) + VREF
(1)
Laser trims are performed on R1 through R4 to ensure that
their values are as close as possible to the absolute values in the
gain equation. This ensures low gain error and high common-
mode rejection at all practical gains.
RG
EXTERNAL GAIN RESISTOR
REF
–IN
+IN
+VS
–VS
+VS
R1
100k
R2
25k
R5
200k
R6
200k
R3
25k
2k
0.1V
V1
A2
A1
Q1
Q2
OUTPUT
R4
100k
00782-
033
Figure 35. Simplified Schematic
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AD627AR-REEL 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源,单路/双路(±):2.7 V ~ 12 V,±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP(0.173",4.40mm 宽) 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT
AD627AR-REEL7 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源,单路/双路(±):2.7 V ~ 12 V,±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP(0.173",4.40mm 宽) 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT
AD627ARZ 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源,单路/双路(±):3 V ~ 32 V,±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP(0.173",4.40mm 宽) 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR
AD627ARZ-R7 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源,单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘,CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT
AD627ARZ-RL 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:350 V/µs 增益带宽积:180MHz -3db带宽:320MHz 电流 - 输入偏压:12.5µA 电压 - 输入偏移:800µV 电流 - 电源:15mA 电流 - 输出 / 通道:85mA 电压 - 电源,单路/双路(±):2.5 V ~ 12.6 V,±1.25 V ~ 6.3 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP,8-MSOP(0.118",3.00mm 宽) 供应商设备封装:8-MSOP 包装:带卷 (TR)