參數(shù)資料
型號: AD8227ARMZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 15/24頁
文件大小: 0K
描述: IC AMP INSTR R-R 250KHZ 8MSOP
標(biāo)準(zhǔn)包裝: 3,000
放大器類型: 儀表
電路數(shù): 1
輸出類型: 滿擺幅
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
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 帶卷 (TR)
AD8227
Rev. 0 | Page 22 of 2
4
APPLICATIONS INFORMATION
DIFFERENTIAL DRIVE
Figure 64 shows how to configure the AD8227 for differential
output.
+IN
–IN
REF
AD8227
VBIAS
R
+
OP AMP
+OUT
–OUT
06
4
07
75
9-
R
RECOMMENDED OP AMPS: AD8515, AD8641, AD820.
RECOMMENDED R VALUES: 5k to 20k.
Figure 64. Differential Output Using an Op Amp
The differential output is set by the following equation:
VDIFF_OUT = VOUT+ VOUT = Gain × (VIN+ VIN)
The common-mode output is set by the following equation:
VCM_OUT = (VOUT+ VOUT)/2 = VBIAS
The advantage of this circuit is that the dc differential accuracy
depends on the AD8227 and not on the op amp or the resistors.
This circuit takes advantage of the AD8227’s precise control of
its output voltage relative to the reference voltage. Op amp dc
performance and resistor matching affect the dc common-mode
output accuracy. However, because common-mode errors are
likely to be rejected by the next device in the signal chain, these
errors typically have little effect on overall system accuracy.
Tips for Best Differential Output Performance
For best ac performance, an op amp with at least 2 MHz gain
bandwidth and 1 V/μs slew rate is recommended. Good choices
for op amps are the AD8641, AD8515, or AD820.
Keep trace lengths from resistors to the inverting terminal of
the op amp as short as possible. Excessive capacitance at this
node can cause the circuit to be unstable. If capacitance cannot
be avoided, use lower value resistors.
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8227
make it an excellent choice for bridge measurements. The
bridge can be connected directly to the inputs of the amplifier
(see Figure 65).
5V
2.5V
10F
0.1F
AD8227
+IN
–IN
RG
350
+
07
75
9-
06
5
Figure 65. Precision Strain Gage
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