- 鎮ㄧ従(xi脿n)鍦ㄧ殑浣嶇疆锛�璨疯常IC缍�(w菐ng) > PDF鐩寗5915 > AD8295BCPZ-WP (Analog Devices Inc)IC IN AMP PREC FE +/-18V 16LFCSP PDF璩囨枡涓嬭級
鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | AD8295BCPZ-WP |
| 寤犲晢锛� | Analog Devices Inc |
| 鏂囦欢闋�(y猫)鏁�(sh霉)锛� | 15/28闋�(y猫) |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC IN AMP PREC FE +/-18V 16LFCSP |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 64 |
| 鏀惧ぇ鍣ㄩ鍨嬶細 | 鍎€琛� |
| 闆昏矾鏁�(sh霉)锛� | 3 |
| 杞�(zhu菐n)鎻涢€熺巼锛� | 2 V/µs |
| 澧炵泭甯跺绌嶏細 | 1MHz |
| -3db甯跺锛� | 1.2MHz |
| 闆绘祦 - 杓稿叆鍋忓锛� | 200pA |
| 闆诲 - 杓稿叆鍋忕Щ锛� | 60µV |
| 闆绘祦 - 闆绘簮锛� | 2mA |
| 闆绘祦 - 杓稿嚭 / 閫氶亾锛� | 18mA |
| 闆诲 - 闆绘簮锛屽柈璺�/闆欒矾(±)锛� | 4.6 V ~ 36 V锛�±2.3 V ~ 18 V |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 16-VQFN锛孋SP |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 16-LFCSP锛�4x4锛� |
| 鍖呰锛� | 鎵樼洡 - 鏅剁矑 |
绗�1闋�(y猫)绗�2闋�(y猫)绗�3闋�(y猫)绗�4闋�(y猫)绗�5闋�(y猫)绗�6闋�(y猫)绗�7闋�(y猫)绗�8闋�(y猫)绗�9闋�(y猫)绗�10闋�(y猫)绗�11闋�(y猫)绗�12闋�(y猫)绗�13闋�(y猫)绗�14闋�(y猫)鐣�(d膩ng)鍓嶇15闋�(y猫)绗�16闋�(y猫)绗�17闋�(y猫)绗�18闋�(y猫)绗�19闋�(y猫)绗�20闋�(y猫)绗�21闋�(y猫)绗�22闋�(y猫)绗�23闋�(y猫)绗�24闋�(y猫)绗�25闋�(y猫)绗�26闋�(y猫)绗�27闋�(y猫)绗�28闋�(y猫)
AD8295
Rev. A | Page 22 of 2
8
R
AD8295
IN-AMP
+VS
+IN
鈥揑N
0.1F
10F
0.1F
REF
VOUT
鈥揤S
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 脳 CC at the positive input and the R 脳 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 脳 (VIN+ VIN)
VCM_OUT = (VOUT+ + VOUT)/2 = VREF
where:
G
R
G
k惟
4
.
49
1 +
=
Figure 56). DC performance is the same as for the single-ended
configuration; ac performance is slightly different.
+IN
鈥揑N
REF
IN-AMP
VREF INPUT
20k
+
鈥�
A1
+OUT
鈥揙UT
07
34
3-
0
18
20k
+
鈥�
Figure 64. Differential Output Configuration Using an Op Amp
A1
OUT
A1
R2
A2
+IN
A2
鈥揑N
鈥揑NPUT
+INPUT
RG
+VS
0.1F
鈥揤S
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
鈥揙UT
A1
R1
A1
鈥揑N
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
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
鈥揑N
R2
20k
+OUT
鈥揙UT
鈥�
+
IN-AMP
+
鈥�
R1
20k
RG
07
34
3-
04
3
Figure 66. Alternative Differential Output Configuration
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