Model 1 specification

Milestones (Macola)

• Functional design: 01.04.2020.
• First working prototype: 01.05.2020.

Digital features

• Equal or similar to DCP405 which 2-ch 16-bit DAC (DAC8552), 4-ch 15-bit ADC (ADS1120), 16-bit I/O expander (MCP23S17) (could be upgraded to 32-bit if necessary), temperature sensor. Other alternative: introduce MCU similar to DCM220 module for ADC and I/O and add external DAC.
• ADC max. sampling rate: 2 KSPS
• DAC settling time: 10 uS
• DIB v1.0 interface: isolated SPI, non-isolated I2C for on-board EEPROM
• Optional: 2 x digital input + 2 x digital output

Analog features

• Optional: Remote sense input with reverse polarity protection (and detection), similar to DCP405
• Optional: Remote programming (voltage, optionally current), similar to DCP405
• OE sync capability
• Temperature monitoring (e.g. TC77)

Power input

• +48 Vdc (Mean Well or similar, dimensions limited to 160 x 97 x 40 mm)

Power output

• 2 (or 4) quadrant, 0 to ±20 V or better (it could be up to 40 V), max. power: 155 W (limited by Mean Well)
• Dual current range, LOW: 0 to ±50 mA, HIGH: 0 to ±2 A or more (does not require fast range switching)
• Sink power limited to e.g. 20 W (dissipated on internal power resistor mounted on heatsink), max. sink power 155 W with external power resistor
• Pulsed power could be as high as possible (even over 155 W dictated by Mean Well AC/DC converter). Pulse period could be anything from e.g. 10 us to 100 ms (we have to monitor temperature!)
• Voltage set resolution: 2 mV
• Voltage readout resolution: 2 mV
• Current set resolutions, LOW: 2 uA (max. 5 uA), HIGH: 100 uA (max. 1 mA)
• Current readout resolution: 2 uA (or better!), 100 uA
• Transient response: fast, <50 us if possible
• AC output simulation frequency: up to 120 Hz with high capacitive load, and few kHz with low capacitive load

Design hints/ideas

• Continuous current measurements on both LOW and HIGH ranges (similar to mikroAmpMeter project but it hast to be modified for bidirectional measurement)
• Low power (up to 50 mA) pure linear stage that is continuously active and backed up with high power stage