# DAC7731EC

**Texas Instruments** · Digital To Analog Converters (DACs) · SSOP-24

DAC7731EC from Texas Instruments, in a SSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | power_in | Positive analog power supply; the electrical characteristics specify +11.4V to +15.75V. |
| 2 | REFOUT | output | Internal +10V reference output, enabled when REFEN is LOW and connected to REFIN for internal reference use. |
| 3 | REFIN | input | Reference input to the on-chip buffer, which must be between 4.75V (or VSS + 14V, whichever is greater) and VCC - 1.4V when an external reference is used. |
| 4 | REFADJ | input | Internal reference trim pin that acts as a gain adjustment input when the internal reference is used. |
| 5 | VREF | power_in | Buffered output from REFIN that drives the DAC circuitry internally and may drive external devices, rated at -2 mA to +2 mA. |
| 6 | ROFFSET | passive | Offsetting resistor connection in the output range configuration network. |
| 7 | AGND | power_in | Analog ground return, to be kept separate from DGND and joined at the system power-entry point. |
| 8 | RFB2 | passive | Feedback resistor 2, used to configure the DAC output range. |
| 9 | RFB1 | passive | Feedback resistor 1, used to configure the DAC output range. |
| 10 | SJ | input | Summing junction of the output amplifier. |
| 11 | VOUT | output | DAC voltage output, configurable for 0V to +10V, ±5V, or ±10V ranges, with a maximum load capacitance of 200pF. |
| 12 | VDD | power_in | Digital power supply, specified from +4.75V to +5.25V (+5.0V typical). |
| 13 | DGND | power_in | Digital ground return for the logic and serial interface, kept separate from AGND. |
| 14 | TEST | passive | Reserved pin that must be connected to DGND. |
| 15 | NC | unconnected | No connection. |
| 16 | RST | input | Active-LOW asynchronous reset that sets the DAC register to mid-scale or min-scale depending on RSTSEL; Schmitt-triggered input. |
| 17 | LDAC | input | DAC register load control, rising-edge triggered, that transfers data from the input register to the DAC register; Schmitt-triggered input. |
| 18 | SDI | input | Serial data input, latched into the input register on the rising edge of SCLK; Schmitt-triggered input. |
| 19 | SDO | tri_state | Serial data output, delayed by 16 SCLK cycles, enabled from high impedance when CS is LOW. |
| 20 | CS | input | Active-LOW chip select that enables the serial shift operation; a rising CS edge should occur only when SCLK is HIGH. |
| 21 | SCLK | input | Serial clock input that clocks data into the input register; Schmitt-triggered input. |
| 22 | RSTSEL | input | Reset select that sets the action of RST: HIGH resets the DAC register to mid-scale, LOW resets it to min-scale. |
| 23 | REFEN | input | Active-LOW enable for the internal +10V reference; HIGH disables the reference and places REFOUT in high impedance. |
| 24 | VSS | power_in | Negative analog power supply, -11.4V to -15.75V for bipolar operation and -4.75V to -15.75V for unipolar operation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-24 |
| Category | ADC/DAC/Data Conversion |
| Pins | 24 |

## CAD (KiCad official)

- Symbol: `DAC7731EC`
- Footprint: `Package_SO:SSOP-24_5.3x8.2mm_P0.65mm`
- 3D model: SSOP-24 (KiCad packages3D, STEP)
- 3D model files: `dac7731ec-etched.step` / `dac7731ec-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dac7731ec.step` / `dac7731ec.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/dac7731) (23 pp, sha256 `031c070247652ea7`, retrieved 2026-10-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/dac7731ec-datasheet.pdf)