MCP4728 Quad 12-Bit DAC

@@ -0,0 +1,48 @@+# 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](https://ww1.microchip.com/downloads/en/devicedoc/22187e.pdf) (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](docs/mcp4728-datasheet.pdf)

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