# ADS7949SRTER

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

ADS7949SRTER 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 | GND | power_in | Analog/digital power supply ground; all analog and digital signals are referred with respect to this pin. |
| 2 | AVDD | power_in | Analog ADC power supply; recommended range is 2.7 V to 5.5 V with 3.3 V nominal. |
| 3 | REF | input | Analog ADC positive reference input; decouple this pin with REFGND. |
| 4 | REFGND | power_in | Analog reference return; short to the analog ground plane. |
| 5 | AIN0P | input | Positive analog input for channel 0. |
| 6 | AIN0N | input | Negative analog input for channel 0; the allowable signal swing on this pin is ±0.2 V and this pin can be grounded. |
| 7 | AIN1N | input | Negative analog input for channel 1; the allowable signal swing on this pin is ±0.2 V and this pin can be grounded. |
| 8 | AIN1P | input | Positive analog input for channel 1. |
| 9 | NC | unconnected | Not connected internally; TI recommends externally shorting this pin to GND. |
| 10 | NC | unconnected | Not connected internally; TI recommends externally shorting this pin to GND. |
| 11 | CH SEL | input | Selects the analog input channel (low = channel 0, high = channel 1); TI recommends changing the channel within a one-clock window starting half a clock after the CS falling edge so the multiplexer output settles before sample start. |
| 12 | PDEN | input | Enables the power-down feature if this pin is high at the CS rising edge. |
| 13 | CS | input | Active-low chip-select signal. |
| 14 | SCLK | input | Serial SPI clock input. |
| 15 | SDO | output | Serial data output. |
| 16 | DVDD | power_in | Digital I/O supply; range is 1.65 V to AVDD per the recommended operating conditions. |
| 17 | EP | 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: `ADS7949SRTER`
- 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: `ads7949srter-etched.step` / `ads7949srter-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads7949srter.step` / `ads7949srter.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/ads7949) (41 pp, sha256 `ec9cbb036b993ad2`, 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/ads7949srter-datasheet.pdf)