# ADS7851IRTER

**Texas Instruments** · Analog To Digital Converters (ADC) · WQFN-16-EP(3x3)

ADS7851IRTER from Texas Instruments, in a WQFN-16-EP(3x3). 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 | REFOUT-A | output | Channel A reference voltage output (REF_A) from the internal reference of the channel A ADC. |
| 2 | REFGND-A | power_in | Reference ground potential for channel A, with the ground voltage difference to GND limited to 0.3 V. |
| 3 | REFGND-B | power_in | Reference ground potential for channel B, with the ground voltage difference to GND limited to 0.3 V. |
| 4 | REFOUT-B | output | Channel B reference voltage output (REF_B) from the internal reference of the channel B ADC. |
| 5 | AINM-B | input | Negative analog input for channel B, which must stay between REFGND_B − 0.3 V and AVDD + 0.3 V. |
| 6 | AINP-B | input | Positive analog input for channel B, which must stay between REFGND_B − 0.3 V and AVDD + 0.3 V. |
| 7 | DVDD | power_in | Digital I/O supply, recommended 3.3 V, with an absolute maximum of 7 V to GND. |
| 8 | GND | power_in | Digital ground for the device. |
| 9 | CS | input | Active-low chip-select digital input, limited to GND − 0.3 V to DVDD + 0.3 V. |
| 10 | SCLK | input | Serial communication clock digital input, limited to GND − 0.3 V to DVDD + 0.3 V. |
| 11 | SDO-A | output | Serial data output for channel A. |
| 12 | SDO-B | output | Serial data output for channel B. |
| 13 | GND | power_in | Digital ground for the device. |
| 14 | AVDD | power_in | ADC analog supply, recommended 5 V, with an absolute maximum of 7 V to GND. |
| 15 | AINP-A | input | Positive analog input for channel A, which must stay between REFGND_A − 0.3 V and AVDD + 0.3 V. |
| 16 | AINM-A | input | Negative analog input for channel A, which must stay between REFGND_A − 0.3 V and AVDD + 0.3 V. |
| 17 | Thermal Pad | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-16-EP(3x3) |
| Category | Data Acquisition |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `ADS7851IRTER`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: WQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `ads7851irter-etched.step` / `ads7851irter-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads7851irter.step` / `ads7851irter.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/ads7251) (38 pp, sha256 `6608c6172c7a3e3f`, retrieved 2026-10-08, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/ads7851irter-datasheet.pdf)