Product description
12-bit DAC module with four channels, manufactured by Electrokit. The module is based on Microchip's MCP4728 circuit, which is a 12-bit digital-to-analogue converter (DAC) with four independent output channels. The circuit is designed for applications that require multiple accurate and stable analogue outputs, such as sensor control, voltage references, calibration systems and control of analogue electronics from microcontrollers via I²C (Qwiic).
Each channel can be configured individually. Built-in EEPROM allows to store both settings and DAC values - useful in applications where the output voltage needs to be set only once or rarely, for example in calibration.
Features:
- Four independent, high-resolution DA channels
- Internal reference voltage: 2.048 V (gain = 1) or 4.096 V (gain = 2)
- Alternative reference via V+ for output voltage up to V+
- EEPROM for storing DAC values and configuration
- I2C communication supporting standard (100 kHz), fixed (400 kHz) and high speed (3. 4 MHz)
- LDAC input for synchronous update of all channels
- Low power consumption, suitable for battery-powered applications
- Compact design with dimensions: 25 x 20 mm (mounting holes: c-c 20 x 15 mm, ø2.5 mm)
- Breadboard-friendly connectors and dual Qwiic connectors for easy plug-in
Specifications:
- Supply voltage: 2.7-5.5 VDC
- Output voltage:
- 0-2.048 V (internal ref, gain = 1)
- 0-4.096 V (internal ref, gain = 2)
- 0-V+ (external ref)
- Max rated current per output: approx. 20 mA
- Output impedance: 1 Ω
- Settling time: 6 µs typical
- Max non-linearity: ±0. 2 LSB
- Programmable I2C address, up to 8 possible addresses (default: 0x60)
- Selectable output buffer mode at power down: 1 kΩ, 100 kΩ or 500 kΩ to GND
Connections and use:
Connect V+ and GND to a stable supply source within the specified range. SCL and SDA connect to the corresponding I2C pins on the microcontroller. LDAC and RDY (active low) are managed separately for controlling synchronisation and status of EEPROM write.
Applications:
- Voltage controlled calibration systems
- Sensor bias and reference generation
- Adjustable voltage sources
- Automatic test equipment (ATE)
- Sound, light or motor control via microprocessor
