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參數資料
| 型號： | 3656 |
| 元件分類： | 隔離放大器 |
| 英文描述： | Transformer Coupled ISOLATION AMPLIFIER |
| 中文描述： | 變壓器耦合隔離放大器 |
| 文件頁數： | 7/17頁 |
| 文件大小： | 149K |
| 代理商： | 3656 |
3656
15
FIGURE 11. Differential Input, Floating Source.
the input stage is split into two halves, RF and RF–. The
demodulator load (seen by pin 10 with respect to pin 3) is
still 2M
for the floating load as shown. Notice pin 19 is
common in Figure 11 whereas pin 20 is common in previous
figures.
SERIES STRING SOURCE
Figure 12 shows a situation where a small voltage, which is
part of a series string of other voltages, must be measured.
The basic problem is that the small voltage to be measured
is 500V above the system ground (i.e., a system common-
mode voltage of 500V exists). The circuit converts this
system CMV to an amplifier isolation mode voltage. Thus,
the isolation voltage ratings and isolation-mode rejection
specifications apply.
IMPROVED INPUT CHARACTERISTICS
In situations where it is desired to have better DC input
amplifier characteristics than the 3656 normally provides, it
is possible to add a precision operational amplifier as shown
in Figure 13. Here the instrumentation grade OPA177 is
supplied from the isolated power of the input stage. The
3656 is configured as a unity-gain buffer. The gain of the
OPA177 stage must be chosen to limit its full scale output
voltage to 5V and avoid overdriving the 3656’s demodula-
tors. Since the 3656 draws a significant amount of supply
current, extra filtering or the input supply is required as
shown (2 x 0.47
F).
ELECTROMAGNETIC RADIATION
The transformer coupling used in 3656 for isolation makes
the 3656 a source of electromagnetic radiation unless it is
properly shielded. Physical separation between the 3656 and
sensitive components may not give sufficient attenuation by
itself. In these applications, the use of an electromagnetic
shield is a must. A shield, Burr-Brown 100MS, is specially
designed for use with the 3656 package. Note that the offset
voltage appearing at pin 15 may change by 4mV to 12mV
with use of the shield; however, this can be trimmed (see
Offset Trimming section).
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
D
M
R
F
1M
I/P PWR
100k
+
–
0.47F
–
+
15V
V
OUT
7
4
6
9
2
10
15
11
13
17
16
12
O/P PWR
Pulse GEN
19
1
3
20
14
V
IN
+
–
R
1
R
1
R
F 1M
2M
–
+
15V
V
OUT = –VIN (RF/R1) RF = R1
A
2
A
1
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相關代理商/技術參數 |
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| 3656 | 制造商:ebm-papst Inc 功能描述:FAN 92MM 230VAC |
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| 36560SS | 制造商:Woodhead Molex 功能描述: |
| 36561 | 功能描述:DRIVER WING MAGICSPRING T15X45MM RoHS:否 類別:工具 >> 螺釘和螺母驅動器 系列:- 標準包裝:1 系列:- 類型:六角扳手（內六角扳手）- 偏移 尺寸:0.098"（2.5mm） 特點:- 長度 - 葉片:0.70"（18mm） 長度 - 總體:2.17"（55mm） 重量:0.01 磅（4.54g） 其它名稱:35112WI |
| 3656-1 | 制造商:TE Connectivity 功能描述: |
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