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MCP4728 Quad 12-Bit DAC

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by Ray

Quad-channel 12-bit voltage-output DAC with EEPROM and I2C, keeps settings through power cycles.

dac12-bitquadi2ceeprommicrochipmsop-10
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MCP4728

Microchip · Digital-to-Analog Converter · MSOP-10

The MCP4728 is a quad-channel, 12-bit voltage-output DAC with an I2C interface and on-chip EEPROM. Each channel has a selectable internal 2.048 V reference or VDD reference and a programmable gain, and the EEPROM stores settings so outputs restore on power-up. It suits set-point generation, bias control, and calibration.

Pinout

Pin Name Type Function
1 VDD power_in Positive supply voltage input, 2.7V to 5.5V. Also serves as the external voltage reference (VREF = VDD) when the external reference is selected. Bypass with a 0.1 µF ceramic capacitor to VSS.
2 SCL input I2C serial clock input. Open-drain, requires an external pull-up resistor to VDD. Supports Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes.
3 SDA bidirectional I2C serial data line. Open-drain, requires an external pull-up resistor to VDD. Bidirectional data line for reads/writes to DAC input registers and EEPROM.
4 LDAC input Active-low latch DAC input. A high-to-low transition transfers the contents of the input registers to the output DAC registers, updating all four analog outputs synchronously. Tie high if not used.
5 RDY/BSY output Ready/Busy status output. Indicates EEPROM programming status: high when the internal EEPROM write is complete (Ready), low while EEPROM is being programmed (Busy). Open-drain style status pin.
6 VOUT A output Analog voltage output for DAC channel A. Buffered rail-to-rail output; full-scale range is either VDD (external reference) or VREF/2·VREF (internal 2.048V reference with gain 1 or 2). Short-circuit current typ. 15 mA.
7 VOUT B output Analog voltage output for DAC channel B. Buffered rail-to-rail output; full-scale range is either VDD (external reference) or VREF/2·VREF (internal 2.048V reference with gain 1 or 2).
8 VOUT C output Analog voltage output for DAC channel C. Buffered rail-to-rail output; full-scale range is either VDD (external reference) or VREF/2·VREF (internal 2.048V reference with gain 1 or 2).
9 VOUT D output Analog voltage output for DAC channel D. Buffered rail-to-rail output; full-scale range is either VDD (external reference) or VREF/2·VREF (internal 2.048V reference with gain 1 or 2).
10 VSS power_in Ground / negative supply reference (0 V).

Key specifications

Parameter Value
Resolution 12-bit, 4 channels
Output Voltage output (rail-to-rail)
Reference Internal 2.048 V or VDD, per channel
Nonvolatile EEPROM stores settings + power-on state
Interface I2C (standard/fast/high-speed)
Supply voltage 2.7 V to 5.5 V
Operating temperature -40 C to 85 C

CAD (KiCad official)

  • Symbol: mcp4728.kicad_sym
  • Footprint: mcp4728.kicad_mod
  • 3D model: MSOP-10 body from KiCad Package_SO/MSOP-10_3x3mm_P0.5mm.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip datasheet (68 pp, sha256 7e6515c45a02ffe4, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF