ADS1231IDR from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	DVDD	power_in	Digital power supply. 3 V to 5.3 V. Decouple to GND close to the pin.
2	GND	power_in	Ground for digital and analog supplies (shared with pin 11).
3	CLKIN	input	External clock input, typically 4.9152 MHz (1-6 MHz). Tie low to activate the internal oscillator.
4	SPEED	input	Data-rate select input. Logic 0 selects 10 SPS; logic 1 selects 80 SPS.
5	CAP	passive	Gain-amplifier bypass capacitor connection. Connect an external bypass capacitor between the two CAP pins (pins 5 and 6).
6	CAP	passive	Gain-amplifier bypass capacitor connection. Second terminal of the PGA bypass capacitor.
7	AINP	input	Positive analog input to the PGA/ADC. Common-mode range GND+1.5 V to AVDD-1.5 V; full-scale differential input +/-0.5*VREF/128.
8	AINN	input	Negative analog input to the PGA/ADC. Paired with AINP as the bridge-sensor differential input.
9	VREFN	input	Negative voltage reference input. Range GND-0.1 V to VREFP-1.5 V.
10	VREFP	input	Positive voltage reference input. Range VREFN+1.5 V to AVDD+0.1 V (external reference up to 5 V for ratiometric measurements).
11	GND	power_in	Ground for digital and analog supplies (shared with pin 2).
12	SW	output	Low-side power switch for the bridge sensor. Ron typ 3.5 ohm at AVDD=5V; max continuous switch current 30 mA.
13	AVDD	power_in	Analog power supply. 3 V to 5.3 V. Decouple to GND close to the pin.
14	PDWN	input	Power-down (active-low). Holding this pin low powers down the entire converter and resets the ADC.
15	SCLK	input	Serial clock: clocks out data on the rising edge. Also used to initiate Standby mode. Max 5 MHz.
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

Ordering variants

Same part, different packaging or reel option.

ADS1231IDR

CAD (KiCad official)

Symbol: ADS1231IDR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (24 pp, sha256 37a2ab763b8d0e7d, 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