參數(shù)資料
型號(hào): AD627AR-REEL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 7/25頁(yè)
文件大?。?/td> 0K
描述: IC AMP INST R-R 25MA 8SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類(lèi)型: 儀表
電路數(shù): 1
輸出類(lèi)型: 滿(mǎn)擺幅
轉(zhuǎn)換速率: 0.06 V/µs
-3db帶寬: 80kHz
電流 - 輸入偏壓: 2nA
電壓 - 輸入偏移: 25µV
電流 - 電源: 60µA
電流 - 輸出 / 通道: 25mA
電壓 - 電源,單路/雙路(±): 2.2 V ~ 36 V,±1.1 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 帶卷 (TR)
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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