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AD202JY Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD202JY
Szczegółowy opis  Low Cost, Miniature Isolation Amplifiers
Download  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD202JY Arkusz danych(HTML) 10 Page - Analog Devices

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REV. B
–10–
AD202/AD204
Process Current Input with Offset.
Figure 18 shows an iso-
lator receiver which translates a 4-20 mA process current signal
into a 0 V to +10 V output. A 1 V to 5 V signal appears at the
isolator’s output, and a –1 V reference applied to output LO
provides the necessary level shift (in multichannel applications,
the reference can be shared by all channels). This technique is
often useful for getting offset with a follower-type output buffer.
4
37
38
3
2
–15V
+15V
15k
10k
0 TO +10V
6
4
7
1
2
250
AD202
OR
AD204
1V TO 5V
3
4-20mA
–1V TO
ADDITIONAL
CHANNELS
1k
–15V
AD589
237
6.8k
Figure 18. Process Current Input Isolator with Offset
The circuit as shown requires a source compliance of at least
5 V, but if necessary that can be reduced by using a lower value
of current-sampling resistor and configuring the input amplifier
for a small gain.
High-Compliance Current Source.
In Figure 19, an isolator
is used to sense the voltage across current-sensing resistor R to
allow direct feedback control of a high-voltage transistor or FET
used as a high-compliance current source. Since the isolator has
virtually no response to dc common-mode voltage, the closed-
loop current source has a static output resistance greater than
10
14
Ω even for output currents of several mA. The output cur-
rent capability of the circuit is limited only by power dissipation
in the source transistor.
4
3
1
AD202
OR
AD204
38
37
~
LOAD
IL = VC
RS
–10V TO +250V
100k
470pF
~
+15V
+5V REF
20k
VC
~
–15V
10k
1k
MPS
U10
RS
1k
2
Figure 19. High-Compliance Current Source
Synchronization.
Since AD204s operate from a common
clock, synchronization is inherent. AD202s will normally not in-
teract to produce beat frequencies even when mounted on 0.25-
inch centers. Interaction may occur in rare situations where a
large number of long, unshielded input cables are bundled to-
gether and channel gains are high. In such cases, shielded cable
may be required or AD204s can be used.
APPLICATIONS EXAMPLES
Low-Level Sensor Inputs.
In applications where the output
of low-level sensors such as thermocouples must be isolated, a
low drift input amplifier can be used with an AD204, as shown
in Figure 17. A three-pole active filter is included in the design
to get normal-mode rejection of frequencies above a few Hz and
to provide enhanced common-mode rejection at 60 Hz. If offset
adjustment is needed, it is best done at the trim pins of the
OP07 itself; gain adjustment can be done at the feedback
resistor.
3
1
0.15µF
33
32
4
470k
470k
CLK RET
CLK
37
6
2
0.039µF
38
VO = VI x 1 + 50k
RG
()
5
1µF
1µF
RG
49.9k
4
7
2
3
6
39k
220M
OPTIONAL
OPEN INPUT
DETECTION
AD204
+7.5V
–7.5V
HI
LO
1µF
AD OP-07
Figure 17. Input Amplifier & Filter for Sensor Signals
Note that the isolated supply current is large enough to mandate
the use of 1
µF supply bypass capacitors. This circuit can be
used with an AD202 if a low-power op amp is used instead of
the OP07.
(Circuit figures shown on this page are for SIP style pack-
ages. Refer to page 3 for proper DIP package pinout.)


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