CEAC121 device is intended for interfacing to high speed controlled power supplies. It may be used as general purpose DAC and multichannel precise ADC. The device has optoisolated input and output registers on-board. It gives an opportunity to build simple systems with the single devices. You can read a detail description of device in pdf-file (in russian).
The device consist of:

- 1-channel 16-bits bipolar DAC;

- 12-channels ADC;
- 4-channel optoisolated output register;
- 4-channel optoisolated input register;
- CANBUS interface for communication with control computer;
- embedded microcontroller.

    An user can use CEAC121 both general purpose digital-to-analog converter and  functional generator. An embedded microcontroller may store a file which describes changing output voltages in time. Embedded processor provides linear interpolation of output voltages between characteristic points. All devices in network or programmable group of devices may be started by single broadcast message.
   12-channels ADC design is based on delta-sigma ADC chip and analog multiplexers. Actually the device have 16 input channels and all of them are identical for programmer. But, four channels have on-board connections. Two channels are connected to on-board temperature sensor output and power supply. Two channels are connected to precise reference source and "zero". These connections are used by microprocessor to implement procedure of "system calibration" which highly improves accuracy of ADC. An embedded microprocessor provides multichannel (from 1 up to 16) measurements or fast measurements of single channel. Measured values may be sent to a control computer or may be stored in on-board memory. Stored values may be sent to a control computer after special request from network. Measurements of all devices in network or programmable group of devices may be started or breaked by single broadcast message.