+VS +IN –IN 0.1F 10F 0.1F REF V<" />
參數(shù)資料
型號(hào): AD8295ACPZ-WP
廠商: Analog Devices Inc
文件頁(yè)數(shù): 15/28頁(yè)
文件大?。?/td> 0K
描述: IC AMP INST 1MHZ TRPL LN 16LFCSP
標(biāo)準(zhǔn)包裝: 64
放大器類型: 儀表
電路數(shù): 3
轉(zhuǎn)換速率: 2 V/µs
增益帶寬積: 1MHz
-3db帶寬: 1.2MHz
電流 - 輸入偏壓: 500pA
電壓 - 輸入偏移: 120µV
電流 - 電源: 2mA
電流 - 輸出 / 通道: 18mA
電壓 - 電源,單路/雙路(±): 4.6 V ~ 36 V,±2.3 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-VQFN,CSP
供應(yīng)商設(shè)備封裝: 16-LFCSP(4x4)
包裝: 托盤 - 晶粒
AD8295
Rev. A | Page 22 of 2
8
R
AD8295
IN-AMP
+VS
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–VS
CD
CC
10nF
1nF
07
343
-00
7
4.02k
RG
Figure 63. RFI Suppression
Lower cutoff frequencies improve RFI robustness. Accuracy of
the CC capacitors is important, because any mismatch between
the R × CC at the positive input and the R × CC at the negative
input degrades the CMRR of the AD8295. Keeping CD at least
10 times larger than CC is recommended.
DIFFERENTIAL OUTPUT
The AD8295 can be pin-strapped to provide a differential
output; the simplified schematic is shown in Figure 64 and the
full pin connection is shown in Figure 65. This configuration
uses the instrumentation amplifier to maintain the differential
voltage, while the op amp maintains the common-mode voltage.
Because the in-amp precisely controls the output relative to its
reference pin, this circuit has the same excellent dc performance
as the single-ended output configuration. The transfer function
for the differential and common-mode outputs are as follows:
VDIFF_OUT = VOUT+ VOUT = G × (VIN+ VIN)
VCM_OUT = (VOUT+ + VOUT)/2 = VREF
where:
G
R
G
4
.
49
1 +
=
This configuration is fully specified (see Table 2, Figure 55, and
Figure 56). DC performance is the same as for the single-ended
configuration; ac performance is slightly different.
+IN
–IN
REF
IN-AMP
VREF INPUT
20k
+
A1
+OUT
–OUT
07
34
3-
0
18
20k
+
Figure 64. Differential Output Configuration Using an Op Amp
A1
OUT
A1
R2
A2
+IN
A2
–IN
–INPUT
+INPUT
RG
+VS
0.1F
–VS
OUT
REF
RG
+IN
1
2
3
4
8
7
6
5
13
14
15
16
A1
IA
A2
R1
20k
R2
20k
A2
OUT
AD8295
A1
+IN VREF
INPUT
+OUT
–OUT
A1
R1
A1
–IN
12
11
10
9
0.1F
NOTES
1. CONNECT AS SHOWN IF A2 IS NOT BEING USED.
07
34
3-
0
08
Figure 65. Minimum Component Connections for Differential Output
An alternative differential output configuration, which also
requires no external components, is shown in Figure 66. Unlike
the circuits shown in Figure 64 and Figure 65, this configuration
uses an inverting op amp configuration to double the gain from
the instrumentation amplifier. Because this configuration requires
less gain from the instrumentation amplifier, it can have a wider
frequency response and a wider input common-mode range vs.
output voltage. However, because it does not take advantage of
feedback at the reference pin of the instrumentation amplifier,
dc performance includes the errors from the op amp and the
resistor network. When using the internal precision components
of the AD8295, these errors have a minimal effect on overall
accuracy. This configuration is not specified in this data sheet.
REF
VREF INPUT
A1
+IN
–IN
R2
20k
+OUT
–OUT
+
IN-AMP
+
R1
20k
RG
07
34
3-
04
3
Figure 66. Alternative Differential Output Configuration
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