# ADS1231ID

**Texas Instruments** · Analog To Digital Converters (ADC) · SOIC-16

ADS1231ID from Texas Instruments, in a SOIC-16. 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 | DVDD | power_in | Digital power supply. |
| 2 | GND | power_in | Ground for digital and analog supplies. |
| 3 | CLKIN | input | External clock input: typically 4.9152MHz; tie low to activate internal oscillator. |
| 4 | SPEED | input | Data rate select: 0 = 10SPS, 1 = 80SPS. |
| 5 | CAP | passive | Gain amplifier bypass capacitor connection. |
| 6 | CAP | passive | Gain amplifier bypass capacitor connection. |
| 7 | AINP | input | Positive analog input. |
| 8 | AINN | input | Negative analog input. |
| 9 | VREFN | input | Negative reference input. |
| 10 | VREFP | input | Positive reference input. |
| 11 | GND | power_in | Ground for digital and analog supplies. |
| 12 | SW | output | Low-side power switch. |
| 13 | AVDD | power_in | Analog power supply. |
| 14 | PDWN | input | Power-down: holding this pin low powers down the entire converter and resets the ADC. |
| 15 | SCLK | input | Serial clock: clock out data on the rising edge; also used to initiate Standby mode. |
| 16 | DRDY/DOUT | output | Dual-purpose output: data ready indicates valid data by going low; data output outputs data, MSB first, on the first rising edge of SCLK. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Data Acquisition |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `ADS1231ID`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `ads1231id-etched.step` / `ads1231id-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads1231id.step` / `ads1231id.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/lit/ds/symlink/ads1231.pdf) (24 pp, sha256 `37a2ab763b8d0e7d`, retrieved 2026-10-07, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/ads1231id-datasheet.pdf)