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參數(shù)資料
| 型號(hào)： | ISO175 |
| 元件分類： | 測(cè)量放大器 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | 單電源，軌至軌，低成本儀表放大器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | ISO175 |
6
ISO175
Shield 1
Ext Osc
+V
S1
+V
S2
GND 1
20
–V
S1
3
–V
S2
13
–V
S2
V
OUT
+V
S2
–V
S1
+V
S1
V
IN–
V
IN+
R
LOAD
GND 2
12
23
5
21
0.1μF
1μF
+
4
15
Shield 2
V
OUT
Com2
14
11
10
R
G
22
2
24
Com 1
1μF
+
0.1μF
1μF
0.1μF
+
0.1μF
+1μF
1
2
8
10
20
50
100
200
500
1000
2000
6000
10000
NOTE: (1) No Connection.
NC
(1)
50.00k
12.50k
5.556k
2.632k
1.02k
505.1
251.2
100.2
50.05
25.01
10.00
5.001
NC
(1)
49.9k
12.4k
5.62k
2.61k
1.02k
511
249
100
49.9
24.9
10
4.99
DESIRED
GAIN
R
G
(
)
NEAREST 1% R
G
(
)
BASIC OPERATION
ISO175 instrumentation input isolation amplifier comprises
of a precision instrumentation amplifier followed by an
isolation amplifier. The input and output isolation sections
are galvanically isolated and EMI shielded by matched
capacitors.
Signal and Power Connections
Figure 1 shows power and signal connections. Each power
supply pin should be bypassed with a 1
μ
F tantalum capaci-
tor located as close to the amplifier as possible. All ground
connections should be run independently to a common point
if possible. Signal Common on both input and output sec-
tions provide a high-impedance point for sensing signal
ground in noisy applications. Com 1 and Com 2 must have
a path to ground for bias current return and should be
maintained within
±
1V of GND1 and GND2, respectively.
SETTING THE GAIN
Gain of the ISO175 is set by connecting a single external
resistor R
G
, connected between pins 2 and 22.
G
=
1
+
50k
FIGURE 1. Basic Connections.
Commonly used gains and resistor values are shown in
Figure 1.
The 50k
term in equation (1) comes from the sum of the
two internal feedback resistors. These on-chip metal film
resistors are laser trimmed to accurate absolute values. The
accuracy and temperature coefficient of this resistor are
included in the gain accuracy and drift specifications of the
ISO175.
The stability and temperature drift of the external gain
setting resistor R
G
, also affects gain. R
G
’s contribution to
gain accuracy and drift can be directly inferred from the
R
G
(1)
gain equation (1). Low resistor values required for high
gain can make wiring resistance important. Sockets add to
the wiring resistance which will contribute additional gain
error (possibly an unstable gain error) in gains of approxi-
mately 100 or greater.
INPUT COMMON-MODE RANGE
The linear voltage range of the input circuitry of the ISO175
is from approximately 2.5V below the positive supply volt-
age to 2.5V above the negative supply. As a differential
input voltage causes the output voltage to increase, however,
the linear input range will be limited by the output voltage
swing of the internal amplifiers. Thus, the linear common-
mode input range is related to the output voltage of the
complete input amplifier.
This behavior also depends on the supply voltage—see
performance curves “Input Common-Mode Range vs Out-
put Voltage.”
Input-overload can produce an output voltage that appears
normal. For example, if an input overload condition drives
both input amplifiers to their positive output swing limit, the
difference voltage measured by the output amplifier will be
near zero. The output of the ISO175 will be near 0V even
though both inputs are overloaded.
INPUT PROTECTION
The input of the ISO175 is individually protected for volt-
ages up to
±
40V referenced to GND1. For example, a
condition of –40V on one input and +40V on the other input
will not cause damage. Internal circuitry on each input
provides low series impedance under normal signal condi-
tions. To provide equivalent protection, series input resistors
would contribute excessive noise. If the input is overloaded,
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ISO175P | 制造商:BB 制造商全稱:BB 功能描述:Precision, Isolated INSTRUMENTATION AMPLIFIER |
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| ISO176P | 制造商:Texas Instruments 功能描述:ISOLATION AMPLIFIER, 16 Pin, Plastic, DIP |
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