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參數(shù)資料
| 型號： | ISO255 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Precision, Powered, Three-Port Isolated Instrumentation Amplifier(精密、三端口隔離緩沖放大器(帶變壓器）) |
| 中文描述： | 精密，技術(shù)支持，三端口隔離儀表放大器（精密，三端口隔離緩沖放大器（帶變壓器）） |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 130K |
| 代理商： | ISO255 |
6
ISO255
internal feedback resistors of the input amplifiers. These on
chip metal film resistors are laser trimmed to accurate
absolute values. The accuracy and temperature coefficient of
these resistors are included in the gain accuracy and drift
specifications of the ISO255.
INPUT COMMON-MODE RANGE
The linear common-mode range of the input circuitry of the
ISO255 is approximately
±
14V (or 1V 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 input gain.
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 instrumentation
amplifier will be near 0V even though both inputs are
overloaded.
BASIC OPERATION
ISO255 is a precision, powered, three-port isolated instru-
mentation amplifier. The input and output sections are gal-
vanically isolated by matched and EMI shielded capacitors
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 input
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.
SETTING THE GAIN
Gain of the ISO255 is set by a single external resistor, R
G
,
connected between pins 1 and 2:
The 50k
term in Equation 1 comes from the sum of the two
FIGURE 1. Basic Connections.
220nF
220nF
2.2μF
+V
S1
–V
S1
GND1
Com1
–V
IN
+V
IN
28
26
3
–R
G
R
G
2
+R
G
1
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
ISO255
INA
SYNC
GND3
+V
S3
16
17
15
SYNC +15V
V
IN
V
CM
G
=
1
+
50k
R
G
(1)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ISO3080 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED 5-V FULL AND HALF-DUPLEX RS-485 TRANSCEIVERS |
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