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參數(shù)資料
| 型號(hào)： | ISO165 |
| 元件分類： | 測量放大器 |
| 英文描述： | Precision Instrumentation Amplifier |
| 中文描述： | 精密儀表放大器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 164K |
| 代理商： | ISO165 |
6
ISO165/ISO175
BASIC OPERATION
ISO165 and ISO175 instrumentation input isolation amplifi-
ers are comprised 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 ISO165 and 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 these resistors are
included in the gain accuracy and drift specifications of the
ISO165 and 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)
V
IN+
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
FBP
FBN
R
G
V
IN+
1
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
(
)
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 ISO165
and ISO175 are from approximately 2.5V below the positive
supply voltage to 2.5V above the negative supply. As a
differential input voltage causes the output voltage to in-
crease, 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 ISO165 and ISO175 will be near
0V even though both inputs are overloaded.
INPUT PROTECTION
The inputs of the ISO165 and ISO175 are individually
protected for voltages 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
conditions. To provide equivalent protection, series input
resistors would contribute excessive noise. If the input is
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISO166P | Precision, Isolated OPERATIONAL AMPLIFIER |
| ISO166 | |
| ISO175P | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| ISO175 | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| ISO176P | Precision, Isolated OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISO165/ISO175 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ISO165. ISO175 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| ISO166 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| ISO166/ISO176 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ISO166. ISO176 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| ISO166P | 制造商:BB 制造商全稱:BB 功能描述:Precision, Isolated OPERATIONAL AMPLIFIER |
| ISO16-GM-391 | 功能描述:繼電器插座與硬件 RELAY ISO x16 GADGETEER MODULE RoHS:否 制造商:TE Connectivity / Schrack 附件類型:Socket 相關(guān)繼電器系列:RP, RT, RY 端接類型:PCB 極數(shù):1 |
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