# PCM2903CDBR

**Texas Instruments** · Audio Interface ICs · SSOP-28

PCM2903CDBR from Texas Instruments, in a SSOP-28. 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 | D+ | bidirectional | USB differential input/output plus, LV-TTL level |
| 2 | D- | bidirectional | USB differential input/output minus, LV-TTL level |
| 3 | VBUS | power_in | Must be connected to VDD |
| 4 | DGNDU | power_in | Digital ground for USB transceiver |
| 5 | HID0 | input | HID key state input (mute), active-high, 3.3-V CMOS with internal pulldown |
| 6 | HID1 | input | HID key state input (volume up), active-high, 3.3-V CMOS with internal pulldown |
| 7 | HID2 | input | HID key state input (volume down), active-high, 3.3-V CMOS with internal pulldown |
| 8 | SEL0 | input | Must be set to high, TTL Schmitt trigger input, 5-V tolerant |
| 9 | SEL1 | input | Connected to the USB port of VBUS, TTL Schmitt trigger input, 5-V tolerant |
| 10 | VCCC | power_in | Analog codec power supply (connect decoupling capacitor to GND) |
| 11 | AGNDC | power_in | Analog ground for codec |
| 12 | VINL | input | ADC analog input for L-channel |
| 13 | VINR | input | ADC analog input for R-channel |
| 14 | VCOM | power_in | Common for ADC/DAC (VCCC/2) (connect decoupling capacitor to GND) |
| 15 | VOUTR | output | DAC analog output for R-channel |
| 16 | VOUTL | output | DAC analog output for L-channel |
| 17 | VCCP1 | power_in | Analog PLL power supply (connect decoupling capacitor to GND) |
| 18 | AGNDP | power_in | Analog ground for PLL |
| 19 | VCCP2 | power_in | Analog PLL power supply (connect decoupling capacitor to GND) |
| 20 | XTO | output | Crystal oscillator output |
| 21 | XTI | input | Crystal oscillator input, 3.3-V CMOS-level |
| 22 | AGNDX | power_in | Analog ground for oscillator |
| 23 | VCCX | power_in | Analog oscillator power supply (connect decoupling capacitor to GND) |
| 24 | DIN | input | S/PDIF input, 3.3-V CMOS-level with internal pulldown, 5-V tolerant |
| 25 | DOUT | output | S/PDIF output |
| 26 | DGND | power_in | Digital ground |
| 27 | VDD | power_in | Digital power supply (connect decoupling capacitor to GND) |
| 28 | SSPND | output | Suspend flag output, active-low (Low: suspend, High: operational) |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-28 |
| Category | Interface |
| Pins | 28 |

## CAD (KiCad official)

- Symbol: `PCM2903CDBR`
- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`
- 3D model: SSOP-28 (KiCad packages3D, STEP)
- 3D model files: `pcm2903cdbr-etched.step` / `pcm2903cdbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pcm2903cdbr.step` / `pcm2903cdbr.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/pcm2903c) (36 pp, sha256 `2632e24fa40432b2`, retrieved 2026-10-05, 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-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/pcm2903cdbr-datasheet.pdf)