参数资料
型号: AD8227ARMZ-RL
厂商: Analog Devices Inc
文件页数: 15/24页
文件大小: 0K
描述: IC AMP INSTR R-R 250KHZ 8MSOP
标准包装: 3,000
放大器类型: 仪表
电路数: 1
输出类型: 满摆幅
转换速率: 0.8 V/µs
-3db带宽: 250kHz
电流 - 输入偏压: 20nA
电压 - 输入偏移: 200µV
电流 - 电源: 350µA
电流 - 输出 / 通道: 13mA
电压 - 电源,单路/双路(±): 2.2 V ~ 36 V,±1.5 V ~ 18 V
工作温度: -40°C ~ 125°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)
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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