+VS
參數(shù)資料
型號(hào): AD8227ARZ
廠(chǎng)商: Analog Devices Inc
文件頁(yè)數(shù): 11/24頁(yè)
文件大?。?/td> 0K
描述: IC AMP INSTR R-R 250KHZ 8SOIC
產(chǎn)品培訓(xùn)模塊: Instrumentation Amplifiers Performance
標(biāo)準(zhǔn)包裝: 98
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: 0.8 V/µs
-3db帶寬: 250kHz
電流 - 輸入偏壓: 20nA
電壓 - 輸入偏移: 200µV
電流 - 電源: 350µA
電流 - 輸出 / 通道: 13mA
電壓 - 電源,單路/雙路(±): 2.2 V ~ 36 V,±1.5 V ~ 18 V
工作溫度: -40°C ~ 125°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: 管件
產(chǎn)品目錄頁(yè)面: 771 (CN2011-ZH PDF)
AD8227
Rev. 0 | Page 19 of
24
THEORY OF OPERATION
A3
R2
8k
R1
8k
A1
A2
Q2
Q1
–IN
+IN
+VS
–VS
R3
50k
R4
10k
R5
10k
RB
+VS
–VS
VOUT
REF
07
75
9-
0
58
NODE 1
NODE 2
RG
+VS
–VS
VBIAS
+VS
–VS
NODE 4
NODE 3
R6
50k
DIFFERENCE
AMPLIFIER STAGE
GAIN STAGE
ESD AND
OVERVOLTAGE
PROTECTION
ESD AND
OVERVOLTAGE
PROTECTION
–VS
Figure 58. Simplified Schematic
ARCHITECTURE
The AD8227 is based on the classic three op amp topology. This
topology has two stages: a preamplifier to provide differential
amplification followed by a difference amplifier that removes
the common-mode voltage and provides additional amplifica-
tion. Figure 58 shows a simplified schematic of the AD8227.
The first stage works as follows. To maintain a constant voltage
across the bias resistor, RB, Amplifier A1 must keep Node 3 at a
constant diode drop above the positive input voltage. Similarly,
Amplifier A2 keeps Node 4 at a constant diode drop above the
negative input voltage. Therefore, a replica of the differential
input voltage is placed across the gain setting resistor, RG. The
current that flows across this resistance must also flow through
the R1 and R2 resistors, creating a gained differential signal
between the A2 and A1 outputs. Note that, in addition to a
gained differential signal, the original common-mode signal,
shifted a diode drop up, is also still present.
The second stage is a difference amplifier, composed of
Amplifier A3 and the R3 through R6 resistors. This stage
removes the common-mode signal from the amplified
differential signal and gains it by 5.
The transfer function of the AD8227 is
VOUT = G × (VIN+ VIN) + VREF
where:
G
R
G
80
5 +
=
GAIN SELECTION
Placing a resistor across the RG terminals sets the gain of the
AD8227. The gain can be calculated by referring to Table 7 or
by using the following gain equation:
5
80
=
G
R
G
Table 7. Gains Achieved Using Common Resistor Values
Standard Table Value of RG
Calculated Gain
No resistor
5
100 kΩ
5.8
49.9 kΩ
6.6
26.7 kΩ
8
20 kΩ
9
16 kΩ
10
10 kΩ
13
5.36 kΩ
19.9
2 kΩ
45
1.78 kΩ
49.9
1 kΩ
85
845 Ω
99.7
412 Ω
199
162 Ω
499
80.6 Ω
998
The AD8227 defaults to G = 5 when no gain resistor is used.
The tolerance and gain drift of the RG resistor should be added
to the specifications of the AD8227 to determine the total gain
accuracy of the system. When the gain resistor is not used, gain
error and gain drift are minimal.
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AD8227ARZ 制造商:Analog Devices 功能描述:IC OP AMP ((NS))
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AD8227ARZ-RL 功能描述:IC AMP INSTR R-R 250KHZ 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):1 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源,單路/雙路(±):2.7 V ~ 36 V,±1.35 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)
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AD8227BRMZ-R7 功能描述:IC AMP INSTR R-R 250KHZ 8-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:通用 電路數(shù):2 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源,單路/雙路(±):1.8 V ~ 5.25 V,±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬) 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件