Analog Devices / Maxim Integrated MAXREFDES61 Reference Design
Analog Devices Inc. MAXREFDES61 Reference Design features a 16-bit high-accuracy four-channel analog input with isolated power and data. Two of the input channels accept -10V to +10V signals and the other two inputs accept 4mA to 20mA signals.
The MAXREFDES61 design integrates a dual low-noise low-distortion buffer (MAX9633); a 16-bit 4-channel multirange input ADC (MAX1301); two high-voltage 4-20mA current protectors (MAX14626) for the current input channels; an ultra-high-precision 4.096V voltage reference (MAX6126); 600VRMS data isolation (MAX14850); a STM32F4 microcontroller; a FTDI USB-UART bridge; a high-efficiency DC-DC converter (MAX15062); and isolated/regulated +15V, +5V, and -3V power rails (MAX17498C/MAX8719/MAX1659/MAX1735).
The entire system typically operates at less than 500mW and fits into a space roughly the size of a credit card. While targeted for the industrial, Micro PLC application, MAXREFDES61 may be used in any application that requires high-accuracy analog-to-digital conversion.
Features
- High accuracy
- -10 to +10V ±20% voltage inputs
- 4 to 20mA +20% current inputs
- Isolated power and data
- Micro PLC form factor
- Device drivers
- Example C source code
- Test data
Applications
- Industrial control and automation
- Process control
- PLC
Block Diagram
