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| 型號： | AD8235ACBZ-P7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INSTR RRIO 23KHZ 11WLCSP |
| 產(chǎn)品變化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 特色產(chǎn)品： | AD8235 Instrumentation Amplifier |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.011 V/µs |
| -3db帶寬： | 23kHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 2500µV |
| 電流 - 電源： | 30µA |
| 電流 - 輸出 / 通道： | 55mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 11-WFBGA，WLCSP |
| 供應(yīng)商設(shè)備封裝： | 11-WLCSP（1.57x2.04） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 771 (CN2011-ZH PDF) |
| 其它名稱： | AD8235ACBZ-P7DKR |
AD8235
Rev. 0 | Page 18 of 20
To eliminate high frequency common-mode signals while using
smaller source resistors, a low-pass RC network can be placed
at the input of the instrumentation amplifier (see Figure 42).
The filter limits the input signal bandwidth according to the
following relationship:
)
G
C
D
C
+
2
(
2
1
DIFF
C
R
π
FilterFreq
+
=
)
(
2
1
G
C
CM
C
R
π
FilterFreq
+
=
Mismatched CC capacitors result in mismatched low-pass filters.
The imbalance causes the AD8235 to treat what is a common-
mode signal as a differential signal. To reduce the effect of
mismatched external CC capacitors, select a value of CD greater
than 10× CC. This sets the differential filter frequency lower than
the common-mode frequency.
R
AD8235
+VS
–IN
+IN
10F
0.1F
VOUT
REF
CC
CD
1nF
10nF
CC
1nF
4.02k
08
21
1-
04
0
SDN
Figure 42. RFI Suppression
COMMON-MODE INPUT VOLTAGE RANGE
The common-mode input voltage range is a function of the
input voltages, reference voltage, supplies, and the output of
Internal Op Amp A. Figure 35 shows the internal nodes of the
voltage ranges for typical supply voltages and gains.
If the supply voltages and reference voltage are not represented
used to calculate the acceptable common-mode voltage range:
1.
Adhere to the input, output, and reference voltage ranges
2.
Calculate the output of Internal Op Amp A. The following
equation calculates this output:
4
V
R
kΩ
52.5
2
V
4
5
A
REF
DIFF
G
DIFF
CM
=
where:
VDIFF is defined as the difference in input voltages,
VDIFF = VINP VINM.
VCM is defined as the common-mode voltage,
VCM = (VINP + VINM)/2.
If no gain setting resistor, RG, is installed, set RG to infinity.
3.
Keep A within 10 mV of either supply rail. This is valid over
the 40°C to +125°C temperature range.
VS + 10 mV < A < +VS – 10 mV
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