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| 型號： | AD210BN |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP ISOL PREC LDRIFT 38DIP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 隔離 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1 V/µs |
| -3db帶寬： | 20kHz |
| 電流 - 輸入偏壓： | 30pA |
| 電壓 - 輸入偏移： | 5000µV |
| 電流 - 電源： | 50mA |
| 電流 - 輸出 / 通道： | 5mA |
| 電壓 - 電源，單路/雙路(±)： | 14.25 V ~ 15.75 V |
| 工作溫度： | -25°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 38-DIP（0.800"，20.32mm），12 引線 |
| 供應(yīng)商設(shè)備封裝： | 12-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 772 (CN2011-ZH PDF) |
AD210
REV. A
–8–
MULTICHANNEL DATA ACQUISITION FRONT-END
Illustrated in Figure 22 is a four-channel data acquisition front-
end used to condition and isolate several common input signals
found in various process applications. In this application, each
AD210 will provide complete isolation from input to output as
well as channel to channel. By using an isolator per channel,
maximum protection and rejection of unwanted signals is
obtained. The three-port design allows the AD210 to be
configured as an input or output isolator. In this application the
isolators are configured as input devices with the power port
providing additional protection from possible power source
faults.
Channel 1:
The AD210 is used to convert a 4–20 mA current
loop input signal into a 0 V–10 V input. The 25
shunt resistor
converts the 4-20 mA current into a +100 mV to +500 mV signal.
The signal is offset by –100 mV via RO to produce a 0 mV to
+400 mV input. This signal is amplified by a gain of 25 to produce
the desired 0 V to +10 V output. With an open circuit, the AD210
will show –2.5 V at the output.
Channel 2:
In this channel, the AD210 is used to condition and
isolate a current output temperature transducer, Model AD590. At
+25
°C, the AD590 produces a nominal current of 298.2 A. This
level of current will change at a rate of 1
A/°C. At –17.8°C (0°F),
the AD590 current will be reduced by 42.8
A to +255.4 A. The
AD580 reference circuit provides an equal but opposite current,
resulting in a zero net current flow, producing a 0 V output from
the AD210. At +100
°C (+212°F), the AD590 current output will
be 373.2
A minus the 255.4 A offsetting current from the
AD580 circuit to yield a +117.8
A input current. This current is
converted to a voltage via RF and RG to produce an output of
+2.12 V. Channel 2 will produce an output of +10 mV/
°F over a
0
°F to +212°F span.
Channel 3:
Channel 3 is a low level input channel configured with
a high gain amplifier used to condition millivolt signals. With the
AD210’s input set to unity and the input amplifier set for a gain of
1000, a
±10 mV input will produce a ±10 V at the AD210’s output.
Channel 4:
Channel 4 illustrates one possible configuration for
conditioning a bridge circuit. The AD584 produces a +10 V
excitation voltage, while A1 inverts the voltage, producing negative
excitation. A2 provides a gain of 1000 V/V to amplify the low level
bridge signal. Additional gain can be obtained by reconfiguration
of the AD210’s input amplifier.
±V
ISS provides the complete power
for this circuit, eliminating the need for a separate isolated excita-
tion source.
Each channel is individually addressed by the multiplexer’s chan-
nel select. Additional filtering or signal conditioning should follow
the multiplexer, prior to an analog-to-digital conversion stage.
+VOSS
+VISS
–VISS
–VOSS
AD210
RO
50k
17
15
18
16
19
14
4
3
29
COM
+V
TO A/D
+VOSS
+VISS
–VISS
–VOSS
OFFSET
50k
17
15
18
16
19
14
4
3
2
30
29
+VISS
–VISS
15
+VOSS
–VOSS
AD210
18
19
14
4
3
2
1
30
+VOSS
–VOSS
AD210
17
18
16
19
4
3
1
30
29
RG 1k
1
200k
8.25k
AD210
1
10T
4-20mA
25
50k
1k
RG 5k
10T
RF
15.8k
10T
50k
30
16
17
100
AD590
AD580
–VISS
+VISS
RO
1k
10T
9.31k
AD OP-07
+VISS
–VISS
+VISS
–VISS
15
14
0.47F
50k
50
1.0F
39k
EIN
1M
1k
20k
+VISS
–VISS
29
+VISS
–VISS
A2
A1
AD584
+VISS
COM
+15V
DC POWER
SOURCE
2
AD7502
MULTIPLEXER
–V
CHANNEL
SELECT
CHANNEL 3
CHANNEL 1
CHANNEL 2
CHANNEL 4
+10V
A1 A2 = AD547
Figure 22. Multichannel Data Acquisition Front-End
C1005–9–9/86
PRINTED
IN
U.S.A.
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