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AD210JN Datenblatt(PDF) 8 Page - Analog Devices |
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AD210JN Datenblatt(HTML) 8 Page - Analog Devices |
8 / 8 page 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 Ω 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 µA. This level of current will change at a rate of 1 µA/°C. At –17.8°C (0°F), the AD590 current will be reduced by 42.8 µA to +255.4 µA. 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 µA minus the 255.4 µA offsetting current from the AD580 circuit to yield a +117.8 µA 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 1kΩ 1 200k Ω 8.25k AD210 1 10T 4-20mA 25 Ω 50k 1k Ω RG 5k 10T RF 15.8k 10T 50k 30 16 17 100 Ω AD590 AD580 –VISS +VISS RO 1k Ω 10T 9.31k AD OP-07 +VISS –VISS +VISS –VISS 15 14 0.47µF 50k Ω 50 Ω 1.0µF 39k EIN 1M 1k 20k 20k 20k 20k +VISS –VISS 29 +VISS –VISS A2 A1 AD584 +VISS COM +15V DC POWER SOURCE 2 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 |
Ähnliche Teilenummer - AD210JN |
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Ähnliche Beschreibung - AD210JN |
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