参数资料
型号: AD8227BRMZ
厂商: Analog Devices Inc
文件页数: 14/24页
文件大小: 0K
描述: IC AMP INSTR R-R 250KHZ 8-MSOP
产品培训模块: Instrumentation Amplifiers Performance
标准包装: 50
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: 100µV
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: 管件
产品目录页面: 771 (CN2011-ZH PDF)
AD8227
Rev. 0 | Page 21 of 2
4
INPUT BIAS CURRENT RETURN PATH
The other AD8227 terminals should be kept within the supplies.
All terminals of the AD8227 are protected against ESD.
The input bias current of the AD8227 must have a return path to
ground. When the source, such as a thermocouple, cannot provide
a return current path, one should be created, as shown in Figure 62.
For applications where the AD8227 encounters voltages beyond
the allowed limits, external current limiting resistors and low
leakage diode clamps such as the BAV199L, the FJH1100s, or
the SP720 should be used.
THERMOCOUPLE
+VS
REF
–VS
AD8227
CAPACITIVELY COUPLED
+VS
REF
C
–VS
AD8227
TRANSFORMER
+VS
REF
–VS
AD8227
INCORRECT
CAPACITIVELY COUPLED
+VS
REF
C
R
C
R
–VS
AD8227
1
fHIGH-PASS = 2πRC
THERMOCOUPLE
+VS
REF
–VS
10M
AD8227
TRANSFORMER
+VS
REF
–VS
AD8227
CORRECT
RADIO FREQUENCY INTERFERENCE (RFI)
RF rectification is often a problem when amplifiers are used in
applications that have strong RF signals. The disturbance can
appear as a small dc offset voltage. High frequency signals can
be filtered with a low-pass RC network placed at the input of
the instrumentation amplifier, as shown in Figure 63. The filter
limits the input signal bandwidth, according to the following
relationship:
0
77
59
-06
2
Figure 62. Creating an Input Bias Current Return Path
INPUT PROTECTION
The AD8227 has very robust inputs and typically does not need
additional input protection. Input voltages can be up to 40 V
from the opposite supply rail. For example, with a +5 V positive
supply and a 8 V negative supply, the part can safely withstand
voltages from 35 V to +32 V. Unlike some other instrumentation
amplifiers, the part can handle large differential input voltages
even when the part is in high gain. Figure 17 through Figure 20
show the behavior of the part under overvoltage conditions.
)
2
(
π
2
1
C
D
DIFF
C
R
uency
FilterFreq
+
=
C
CM
RC
uency
FilterFreq
π
2
1
=
where CD ≥ 10 CC.
R
AD8227
+VS
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–VS
RG
CD
10nF
CC
1nF
CC
1nF
4.02k
07
75
9-
0
63
Figure 63. RFI Suppression
CD affects the differential signal and CC affects the common-
mode signal. Values of R and CC should be chosen to minimize
RFI. A mismatch between R × CC at the positive input and
R × CC at the negative input degrades the CMRR of the AD8227.
By using a value of CD one magnitude larger than CC, the effect
of the mismatch is reduced, and performance is improved.
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