# PGA2311U

**Texas Instruments** · Audio Amplifiers · SOIC-16-300mil

PGA2311U from Texas Instruments, in a SOIC-16-300mil. 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 | ZCEN | input | Zero-crossing enable input (active high); enables gain transitions at zero-crossings with 16 ms timeout |
| 2 | CS | input | Chip-select input (active low); data written when CS is LOW for 16-bit transfer |
| 3 | SDI | input | Serial data input; 16-bit control word (8 bits per channel, MSB first, 0.5 dB step resolution) |
| 4 | VD+ | power_in | Digital power supply +5 V nominal (4.75 V to 5.25 V operating range) |
| 5 | DGND | power_in | Digital ground reference |
| 6 | SCLK | input | Serial clock input; data latched on rising edge (0 to 6.25 MHz maximum) |
| 7 | SDO | tri_state | Serial data output; tri-state when CS HIGH, used for daisy-chaining multiple devices |
| 8 | MUTE | input | Mute control input (active low); disconnects output amplifier with 10 kΩ to ground termination |
| 9 | VINR | input | Analog input right channel; referenced to AGNDR with 2.5 Vrms maximum without clipping |
| 10 | AGNDR | power_in | Analog ground right channel |
| 11 | VOUTR | output | Analog output right channel; maximum swing within ±1.25 V of analog supply rails |
| 12 | VA+ | power_in | Analog power supply +5 V nominal (4.75 V to 5.25 V operating range) |
| 13 | VA- | power_in | Analog power supply -5 V nominal (-4.75 V to -5.25 V operating range) |
| 14 | VOUTL | output | Analog output left channel; maximum swing within ±1.25 V of analog supply rails |
| 15 | AGNDL | power_in | Analog ground left channel |
| 16 | VINL | input | Analog input left channel; referenced to AGNDL with 2.5 Vrms maximum without clipping |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Amplifiers/Comparators |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `PGA2311U`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `pga2311u-etched.step` / `pga2311u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pga2311u.step` / `pga2311u.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/pga2311) (27 pp, sha256 `17b42f9e9b169986`, retrieved 2026-10-03, tier: lcsc)
- **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/pga2311u-datasheet.pdf)