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| 型號： | AD8251-EVALZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD8251 PGA |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | iCMOS® |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 儀表 |
| 輸出類型： | 單端 |
| 轉(zhuǎn)換速率： | 20 V/µs |
| -3db帶寬： | 10MHz |
| 工作溫度： | -40°C ~ 85°C |
| 電流供應(yīng)（主 IC）： | 4.1mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 15 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8251 |
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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