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參數(shù)資料
| 型號(hào)： | ISO254P |
| 英文描述： | Precision, Powered, Three-Port Isolated PROGRAMMABLE GAIN AMPLIFIER |
| 中文描述： | 精密，技術(shù)支持，三端口隔離可編程增益放大器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 172K |
| 代理商： | ISO254P |
6
ISO254
INPUT COMMON-MODE RANGE
The linear common-mode range of the input circuitry of the
ISO254 is approximately
±
12.7V (or 2.3V from the power
supplies). As the output voltage increases, however, the
linear input range will be limited by the output voltage swing
of the internal amplifiers. Thus, the linear common-mode
range is related to the output voltage of the complete input
amplifier—see performance curves “Input Common-Mode
Range vs Output Voltage.”
A combination of common-mode and differential input
voltage can cause the output voltage of the internal amplifi-
ers to saturate. For applications where input common-mode
range must be maximized, limit the output voltage swing by
selecting a lower gain of the programmable-gain input.
Input-overload can produce an output voltage that appears
normal. For example, an input voltage of +20V on one input
and +40V on the other input will exceed the linear common-
mode range of both input amplifiers. Since both input
amplifiers are saturated to nearly the same output voltage
limit, the difference voltage measured by the output ampli-
fier will be near zero. The output of the programmable-gain
amplifier will be near 0V even though both inputs are
overloaded.
BASIC OPERATION
ISO254 is a precision, powered, three-port isolated program-
mable-gain amplifier. The input and output sections are
galvanically isolated by matched and EMI shielded capaci-
tors built into the plastic package. The DC/DC converter
input is also galvanically isolated from both the input and
output supplies.
SIGNAL AND POWER CONNECTIONS
Figure 1 shows proper power and signal connections. The
power supply input pin +V
S3
should be bypassed with a
2.2
μ
F tantalum capacitor and the outputs V
S1
and V
S2
with
220nF ceramic capacitors located as close to the amplifier as
possible. All ground connections should be run indepen-
dently to a common point. Signal Common on the output
section provides a low-impedance point for sensing signal
ground in noisy applications. Com1 and Com2 must have a
path to ground for signal current return and should be
maintained within
±
1V of GND1 and GND2 respectively.
FIGURE 1. Basic Connections.
220nF
220nF
1
10
100
1000
0
0
1
1
0
1
0
1
GAIN
A1
A0
2.2μF
+V
S1
–V
S1
GND1
Com1
–V
IN
+V
IN
28
26
3
4
27
25
+V
S2
–V
S2
GND2
Com2
12
V
OUT
13
11
10
V
OUT
14
+15V
OUT
–15V
OUT
220nF
220nF
+15V
OUT
–15V
OUT
ISO254
PGA
A0
A1
1
SYNC
GND3
+V
S3
16
17
15
2
SYNC +15V
V
IN
V
CM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISO254 | Precision, Powered, Three-Port Isolated PROGRAMMABLE GAIN AMPLIFIER |
| ISO255P | Precision, Powered, Three-Port Isolated INSTRUMENTATION AMPLIFIER |
| ISO2 | ASIC |
| ISO3 | ASIC |
| ISO5 | ASIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISO255 | 制造商:BB 制造商全稱:BB 功能描述:Precision, Powered, Three-Port Isolated INSTRUMENTATION AMPLIFIER |
| ISO255P | 制造商:BB 制造商全稱:BB 功能描述:Precision, Powered, Three-Port Isolated INSTRUMENTATION AMPLIFIER |
| ISO256 | 制造商:BB 制造商全稱:BB 功能描述:Precision, Powered, Three-Port Isolated OPERATIONAL AMPLIFIER |
| ISO256P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-ISOLATION OP AMP |
| ISO3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
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