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參數資料
| 型號： | ISO213 |
| 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： | 10/13頁 |
| 文件大?。?/td> | 131K |
| 代理商： | ISO213 |
10
ISO213
CHARGE ISOLATION
When more than one ISO213 is used in synchronous mode,
the charge which is returned from the timing capacitor
(220pF in Figure 5) on each transition of the clock becomes
significant. Figure 7 illustrates a method of isolating the
“Clk Out” clamp diodes (Figure 5) from this charge.
A 22k
resistor (recommended maximum) together with the
39k
internal oscillator timing resistor (Figure 5) forms a
potential divider. The ratio of these resistors should be
greater than 0.6 which ensures that the input voltage triggers
the inverter connected to “Clk In”. If using a single resistor,
then account must be taken of the paralleled timing resistors.
This means that the 22k
resistor must be halved to drive
two ISO213s, or divided by 8 if driving 8 ISO213s to insure
that the ratio of greater than 0.6 is maintained. The series
resistors shown in Figure 7 reduce the high frequency
content of the power supply current. Figure 8 can be used
where a specific frequency of operation is not required.
APPLICATIONS
ISO213 isolation amplifier, together with a few low cost
components, can isolate and accurately convert a 4-to-20mA
input to a
±
10V output with no external adjustment. Its low
height (0.43" (11mm) ) and small footprint (2.5"
x
0.33"
(57mm
x
8mm) ) make it the solution of choice in 0.5" board
spacing systems and in all applications where board area
savings are critical.
ISO213 operates from a single +15V supply and offers low
power consumption and 12-bit accuracy. On the input side,
two isolated power supplies capable of supplying 3mA at
±
14V typical are available to power external circuitry.
APPLICATIONS FLEXIBILITY
In Figure 9, ISO213 +V
ss
isolated supply powers a REF200
to provide an accurate 200
μ
A current source. This current is
used via the 1.5k
resistor to set the output to
–5V at 4mA input.
The primary function of the output circuitry is to add gain,
to produce a
±
10V output and to reduce output impedance.
The addition of a few resistors and capacitors provides a low
pass filter with a cutoff frequency equal to the full signal
bandwidth of ISO213, typically 200Hz. The filter response
is flat to 1dB and rolls off from cut off at –12dB per octave.
The accuracy of REF200 and external resistors eliminates
the need for expensive trim pots and adjustments. The errors
introduced by the external circuitry only add about 10% of
ISO213 specified gain and offset voltage error.
Clk In
Clk In
Clk In
Clk In
D
D
D
D
FIGURE 8. Recommended Synchronizing Scheme.
FIGURE 9. Isolated 4-20mA Current Receiver with Output Filter.
5
0.1μF
0.1μF
22k
22k
4-20mA
R
G
1.02k
R
G
G = 1 + 50k
25
–V
SS
+
–
31
32
38
37
100k
100k
(5%)
(5%)
6.8nF
(10%)
6.8nF (10%)
+15V
6
–15V
4mA to 20mA
–10V to +10V
+15V
8
7
1
3
4mA to 20mA
–5V to +5V
+
OPA27
–
REF200
200μA
2
10μF
3
2
NOTE: All resistors are 0.1%
unless otherwise stated.
1.5k
相關PDF資料 |
PDF描述 |
|---|---|
| ISO213P | Precision Instrumentation Amplifier |
| ISO253P | Precision, Powered, Three-Port Isolated BUFFER AMPLIFIER |
| ISO253 | |
| ISO255 | |
| ISO256 | |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ISO213P | 制造商:BB 制造商全稱:BB 功能描述:Two-Port Isolated, Low Profile ISOLATED INSTRUMENTATION AMPLIFIER |
| ISO-24-AFN | 制造商:ATC DIVERSIFIED ELECTRONICS 功能描述:Relay; ISO Seri; Single Channel; SPST; Cur-Rtg 10A; Ctrl-V 24 VAC; Socket Mount |
| ISO250 | 制造商:AF 功能描述:ISOCLENE, 250ML, CAN |
| ISO253 | 制造商:BB 制造商全稱:BB 功能描述:Precision, Powered, Three-Port Isolated BUFFER AMPLIFIER |
| ISO253P | 制造商:BB 制造商全稱:BB 功能描述:Precision, Powered, Three-Port Isolated BUFFER AMPLIFIER |
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