# ADS9120IRGER

**Texas Instruments** · Analog To Digital Converters (ADC) · QFN-24-EP(4x4)

ADS9120IRGER from Texas Instruments, in a QFN-24-EP(4x4). 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 | CONVST | input | Conversion start input; a rising edge on CONVST moves the device from the ACQ state into the CNV state. |
| 2 | RST | input | Asynchronous reset input; a low pulse resets the device and returns all register bits to their default states. |
| 3 | NC | unconnected | No-connect pin that must be left floating and must not have any external circuit connected to it. |
| 4 | REFM | passive | Reference ground potential for the external reference input; REFM pins 4 and 8 are the reference ground connections. |
| 5 | REFP | passive | Reference voltage input; one of two REFP pins (pins 5 and 7) that set the converter input range. |
| 6 | NC | unconnected | No-connect pin that must be left floating and must not have any external circuit connected to it. |
| 7 | REFP | passive | Reference voltage input; one of two REFP pins (pins 5 and 7) that set the converter input range. |
| 8 | REFM | passive | Reference ground potential for the external reference input; REFM pins 4 and 8 are the reference ground connections. |
| 9 | AINP | passive | Positive analog input of the differential analog input pair. |
| 10 | AINM | passive | Negative analog input of the differential analog input pair. |
| 11 | GND | power_in | Ground pin; the datasheet recommends connecting pins 11 and 15 directly to the ground thermal path. |
| 12 | NC | unconnected | No-connect pin that must be left floating and must not have any external circuit connected to it. |
| 13 | AVDD | power_in | Analog power supply for the device; AVDD pins 13 and 14 must be supplied together. |
| 14 | AVDD | power_in | Analog power supply for the device; AVDD pins 13 and 14 must be supplied together. |
| 15 | GND | power_in | Ground pin; the datasheet recommends connecting pins 11 and 15 directly to the ground thermal path. |
| 16 | DVDD | power_in | Interface power supply for the digital I/O. |
| 17 | SDO-3 | output | Serial communication data output 3; used in the 4-wide SDO bus mode. |
| 18 | SDO-2 | output | Serial communication data output 2; used in the 4-wide SDO bus mode. |
| 19 | SDO-1 | output | Serial communication data output 1; used in the 2-wide and 4-wide SDO bus modes. |
| 20 | SDO-0 | output | Serial communication data output 0; the only SDO pin used in single-SDO mode and go to tri-state when CS is high. |
| 21 | RVS | output | Multi-function output; while CS is high it reflects the internal ADCST status, and while CS is low its behavior depends on the selected output protocol. |
| 22 | SDI | input | Serial data input used to feed data or commands into the device. |
| 23 | SCLK | input | Serial interface clock input; all system-synchronous data transfer protocols are timed to this signal. |
| 24 | CS | input | Active-low chip select; when low the device controls the data bus, and when high the SDO-x pins are tri-stated. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | QFN-24-EP(4x4) |
| Category | Data Acquisition |
| Pins | 25 |

## CAD (KiCad official)

- Symbol: `ADS9120IRGER`
- Footprint: `Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm`
- 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `ads9120irger-etched.step` / `ads9120irger-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads9120irger.step` / `ads9120irger.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/ads9120) (69 pp, sha256 `4cb57a82a7b4ae03`, 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/ads9120irger-datasheet.pdf)