CN0063

16-Bit Fully Isolated Voltage Output Module Using the AD5662 DAC, ADuM1401 Digital Isolator, and External Amplifiers
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回路機能とその特長

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This circuit provides a complete solution for an industrial control output module. This design is suitable for process control programmable logic controllers (PLCs) and distributed control systems (DCSes) that require bipolar output voltage ranges. The AD5662 nanoDAC® is a 5 V, 16-bit DAC in a SOT-23 package. The ADuM1401 four-channel digital isolator provides all the necessary signal isolation between the microcontroller and the DAC.


Figure 1. 16-Bit Isolated Industrial Control Voltage Output Module (Simplified Schematic)


回路説明

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For industrial control modules, analog output voltage ranges are typically ±5 V, ±10 V, 0 V to 5 V, or 0 V to 10 V. The AD5662 provides a 0 V to 5 V output, which goes through two gain and offset stages to provide 16-bit resolution in each of the above ranges. Jumpers (shown here as switches) are used to switch between output ranges. The OP2177 was chosen for this design, primarily due to low noise and offset performance, as well as bipolar voltage capability.

The ADR02 was chosen as the reference for this circuit. The ADR02 has excellent ppm drift specs at 9 ppm/°C max. It is also often used in industrial applications due to its high input range to 36 V.

The ADuM1401 is a four-channel digital isolator based on Analog Devices iCoupler® technology. It is used to provide isolation between the AD5662 and the system microcontroller, with an isolation rating of 2.5 kV rms. Three wires are used to connect the standard SPI interface connections to the AD5662: SYNC, SCLK, and DIN.


Figure 2. INL Accuracy Plot 0 V to +10 V Output Range

Figure 2 shows an output error plot (integral nonlinearity) of the output of the circuit when the AD5662 is used with the ADR02 external reference. Results are shown in %FSR (full-scale range) as a function of input code.

製品サンプル

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製品

概要

サンプル提供可能な
製品型番

AD5662 16ビットnanoDAC®コンバータ、SOT-23パッケージ、2.7~5.5V

AD5662ARJZ-1500RL7

AD5662ARMZ-1

AD5662ARMZ-1REEL7

AD5662BRJZ-1500RL7

AD5662BRJZ-1REEL7

AD5662BRJZ-2500RL7

AD5662BRMZ-1

ADR02 5.0V電圧リファレンス、バンドギャップ型、超小型、高精度、高安定、低消費電力

ADR02AKSZ-REEL7

ADR02ARZ

ADR02AUJZ-REEL7

ADR02WARZ-REEL7

OP2177 オペアンプ、デュアル、高精度、ローノイズ、低入力バイアス電流

OP2177ARMZ

OP2177ARZ

ADUM1401 4チャンネル・デジタル・アイソレータ(3/1チャンネル方向性)

ADUM1401ARWZ

ADUM1401BRWZ

ADUM1401CRWZ

ADUM1401WSRWZ

ADUM1401WTRWZ