Multi-channel analog output module with multiplexed single-channel DAC for PLCs reference design

This multi-channel analog output module TI Design with multiplexed single channel digital to analog converter (DAC) for programmable logic controllers (PLC) illustrates the design of low-cost, high-speed, small form-factor and high resolution PLC analog output module based on sequentially multiplexed sample and hold buffers.

Features:

• Multiplexed 8 output channels module: 4 channels voltage output; 4 channels current output
• Single 16 bit DAC (DAC8760)
• Effective resolution: voltage output 15 bit; current output 14 bit
• Configurable output range:  voltage output: ±10V, 0-10V, ±5V, 0-5V; current output: 0-20mA, 4-20mA, 0-24mA
• Uncalibrated output accuracy: ±0.2% FS @ 25 °C;  ±0.5% FS over -40°C to 85°C Battery Voltage Monitor
• Scan time: 6ms for 8 channels (conversion time: 750 μs/channel)

Parts Include:

DAC8760   16-bit, single-channel, programmable current/voltage output DAC for 4-20mA current loop applications
MUX36S08   MUX36xxx 36-V, Low-Capacitance, Low-Leakage-Current, Precision, Analog Multiplexers
OPA188   Precision, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier  

Learn more by downloading the reference design below