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參數(shù)資料
| 型號： | 1B22AN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Programmable, Isolated Voltage-to-Current Converter |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP12 |
| 封裝： | 1 X 2.100 INCH, 0.350 INCH HEIGHT, PLASTIC, DIP-38/12 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大小： | 232K |
| 代理商： | 1B22AN |
1B22
REV. B
–3–
INSIDE THE 1B22
The 1B22 produces an isolated 4 to 20 mA or 0 to 20 mA out-
put current which is proportional to the input voltage and
independent of the output load resistance (Figure 1). The input
stage is configured as an inverting amplifier with a resistor net-
work to provide pin-strappable input ranges of 0 V to +5 V and
0 V to +10 V and output ranges of 0 to 20 mA and 4 to 20 mA.
The conditioned signal is modulated to generate a square wave
that drives transformer T1. The peak-to-peak amplitude of the
signal is proportional to V
IN
. An internal, high stability reference
with a nominal output voltage of +6.4 V is used to develop a
4 mA offset for the 4 to 20 mA current loop output.
Figure 1. 1B22 Functional Block Diagram
After passing through signal transformer T1, the amplitude
modulated signal is demodulated and filtered by a single pole
filter. This filtered output is the control signal for the voltage-
to-current converter stage. Timing information for the
demodulator is derived from the power transformer T2. The
1B22 outputs are protected from accidental shorts to ac line
voltages up to 240 V rms. Combined with 1500 V input to out-
put isolation, the 1B22 provides unbeatable protection against
transients, wiring errors and current loop short circuits to power
lines.
The dc-dc converter consists of a power driver, power trans-
former T2, a full wave rectifier and a filter. The dc-dc converter
provides the power for the output circuitry as well as the
isolated compliance voltage for the loop. This voltage is propor-
tional to V
LOOP
on the input side. The 1B22 requires
±
15 V
supplies to power the input side circuitry and a +14 V to +30 V
supply for the dc-dc converter.
USING THE 1B22
Basic Interconnections:
The 1B22 may be applied to achieve
rated performance as shown in Figure 2. For 0 V to 10 V signals
either IN1 or IN2 can be used for input; for 0 V to +5 V signals
jumper IN1 to IN2. Similarly, for 4 to 20 mA operation the
4 mA OFFSET node should be jumpered to the S. NODE,
while for 0 to 20 mA it should be tied to COM. Figure 3 shows
the functional diagram of the resistor network used in the 1B22.
For applications where a separate loop supply is not available,
the
±
15 V supplies can be used by connecting +15 V to V
LOOP
(Pin 24) and COM to P.COM (Pin 25). For additional compli-
ance voltage, P.COM can be connected to –15 V to drive higher
loads.
Figure 2. Basic Interconnections
Figure 3. Internal Resistor Network
Optional Trim Adjustments:
Figure 4 is an example of using
potentiometers for trimming gain and offset for a 0 V to +10 V
input and 4 to 20 mA output. The network for offset adjustment
keeps the resistors relatively small to minimize noise effects
while giving a sensitivity of
±
1% of span. The value of R1
should be 5 M
for the 0 V to +10 V range (for 0 V to +5 V
configurations, a 1.2 M
resistor should be used). For more
adjustment range, resistors smaller than 274 k
can be used.
IN2
4mA
R50k
REF
IN1
S. NODE
R1
POWER
RELOOP
SUPPLY
SYNC
+15V
COM
–
15V
V
LOOP
P. COM
PROT
OUT
HI
OUT
LO
20k
1k
V
IN
274k
50k
+15V
–
15V
1k
1B22
Figure 4. Optional Offset and Span Adjustment
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 1B22AN | 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR 制造商:Analog Devices 功能描述:IC, VOLTAGE-TO-CURRENT CONVERTER, 12-DIP |
| 1B-23A-B | 制造商:FCI 功能描述: |
| 1B243 | 制造商:Ferraz Shawmut 功能描述: |
| 1B245 | 制造商:Ferraz Shawmut 功能描述: |
| 1B-24A | 制造商:FCI 功能描述:CONN CONT M/M 1 POS/1 POS ST - Tape and Reel |
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