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| 型号： | AD8251ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST ICMOS LDRIFT 10MSOP |
| 标准包装： | 1 |
| 系列： | iCMOS® |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 转换速率： | 30 V/µs |
| -3db带宽： | 10MHz |
| 电流 - 输入偏压： | 5nA |
| 电压 - 输入偏移： | 70µV |
| 电流 - 电源： | 4.1mA |
| 电流 - 输出 / 通道： | 37mA |
| 电压 - 电源，单路/双路(±)： | 10 V ~ 30 V，±5 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 771 (CN2011-ZH PDF) |
| 其它名称： | AD8251ARMZ-R7DKR |
AD8251
Rev. B | Page 20 of 24
RF INTERFERENCE
DRIVING AN ADC
RF rectification is often a problem when amplifiers are used in
applications where there are 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 58. The
filter limits the input signal bandwidth according to the following
relationship:
An instrumentation amplifier is often used in front of an ADC
to provide CMRR. Usually, instrumentation amplifiers require a
buffer to drive an ADC. However, the low output noise, low
distortion, and low settle time of the AD8251 make it an
excellent ADC driver.
In Figure 59, a 1 nF capacitor and a 49.9 Ω resistor create an
antialiasing filter for the AD7612. The 1 nF capacitor stores and
delivers the necessary charge to the switched capacitor input of
the ADC. The 49.9 Ω series resistor reduces the burden of the
1 nF load from the amplifier and isolates it from the kickback
current injected from the switched capacitor input of the AD7612.
Selecting too small a resistor improves the correlation between
the voltage at the output of the AD8251 and the voltage at the
input of the AD7612 but may destabilize the AD8251. A trade-
off must be made between selecting a resistor small enough to
maintain accuracy and large enough to maintain stability.
)
C
(
R
1
FilterFreq
C
D
DIFF
+
=
2
π
2
C
CM
RC
1
FilterFreq
π
2
=
where CD ≥ 10 CC.
R
AD8251
+15V
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–15V
CD
CC
0
628
7-
0
57
0.1
μF
0.1
μF
1nF
49.9
AD7612
ADR435
+12V
–12V
+5V
+15V
–15V
A0
A1
WR
+IN
–IN
10
μF0.1F
10
μF0.1F
REF
AD8251
DGND
06
28
7-
0
58
Figure 58. RFI Suppression
Values of R and CC should be chosen to minimize RFI. A
mismatch between the R × CC at the positive input and the
R × CC at negative input degrades the CMRR of the AD8251.
By using a value of CD that is 10 times larger than the value of
C
Figure 59. Driving an ADC
C
, the effect of the mismatch is reduced and performance is
improved.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8251ARMZ-RL | 功能描述:IC AMP INST ICMOS LDRIFT 10MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:iCMOS® 标准包装:150 系列:- 放大器类型:音频 电路数:2 输出类型:- 转换速率:5 V/µs 增益带宽积:12MHz -3db带宽:- 电流 - 输入偏压:100nA 电压 - 输入偏移:500µV 电流 - 电源:6mA 电流 - 输出 / 通道:50mA 电压 - 电源，单路/双路(±):4 V ~ 32 V，±2 V ~ 16 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| AD8251ARZ | 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier |
| AD8251ARZ-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier |
| AD8251ARZ-RL | 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier |
| AD8251-EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier |
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