PCM1808

@@ -0,0 +1,58 @@+# PCM1808++**Texas Instruments** · Stereo audio ADC (I2S) · TSSOP-14++A stereo audio analog-to-digital converter in TSSOP-14, the input-side counterpart of the PCM5102A DAC. It digitizes a left/right line-level analog signal (VINL, VINR) to 24-bit samples at up to 96 kHz using a delta-sigma modulator with 64x oversampling, and streams the result out as I2S (BCK, LRCK, DOUT). A single-ended input stage keeps the external circuit simple, format and mode pins configure the I2S variant and sampling, and it needs only a system clock (SCKI) plus decoupling. It is a common front end for USB audio interfaces, mixers, and recording gear. Runs 5 V analog / 3.3 V digital.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VREF | passive | Reference-voltage decoupling pin at 0.5 x VCC (~2.5 V nominal with VCC = 5 V). Bypass to AGND with a decoupling capacitor; do not drive externally. |+| 2 | AGND | power_in | Analog ground return for the 5-V analog supply (VCC) and analog input circuitry. |AGND - DGND| must be <= 0.1 V. |+| 3 | VCC | power_in | Analog power supply, 5 V nominal (4.5 - 5.5 V recommended, 6.5 V absolute max). Typical ICC = 8.6 mA at fs = 48/96 kHz. |+| 4 | VDD | power_in | Digital power supply, 3.3 V nominal (2.7 - 3.6 V recommended, 4 V absolute max). Typical IDD = 5.9 mA at fs = 48 kHz, 10.2 mA at 96 kHz. |+| 5 | DGND | power_in | Digital ground return for the 3.3-V digital supply (VDD) and digital I/O. |AGND - DGND| must be <= 0.1 V. |+| 6 | SCKI | input | System clock input; 256 fs, 384 fs, or 512 fs (2.048 - 49.152 MHz). Schmitt-trigger, 5-V tolerant. Halting SCKI (along with BCK/LRCK) invokes power-down and internal reset. |+| 7 | LRCK | bidirectional | Audio-data left/right latch-enable (word-select / LRCLK). Input in slave mode, output in master mode. Schmitt-trigger input with 50-kohm typical internal pulldown (slave mode). |+| 8 | BCK | bidirectional | Audio-data serial bit clock (BCLK). Input in slave mode, output in master mode. Schmitt-trigger input with 50-kohm typical internal pulldown (slave mode). |+| 9 | DOUT | output | Audio-data serial digital output (SDATA), 24-bit MSB-first two's complement. Driven per FMT selection (I2S or left-justified). |+| 10 | MD0 | input | Audio-interface mode select 0. Together with MD1 selects master/slave mode and BCK/LRCK ratios. Schmitt-trigger input with 50-kohm typical internal pulldown, 5-V tolerant. |+| 11 | MD1 | input | Audio-interface mode select 1. Together with MD0 selects master/slave mode and BCK/LRCK ratios. Schmitt-trigger input with 50-kohm typical internal pulldown, 5-V tolerant. |+| 12 | FMT | input | Audio-interface data-format select: I2S vs 24-bit left-justified on DOUT. Schmitt-trigger input with 50-kohm typical internal pulldown, 5-V tolerant. |+| 13 | VINL | input | Single-ended analog input, left channel. Full-scale input 3 Vp-p (0.6 x VCC) centered at VREF (0.5 x VCC ~ 2.5 V). Input impedance 60 kohm typical. |+| 14 | VINR | input | Single-ended analog input, right channel. Full-scale input 3 Vp-p (0.6 x VCC) centered at VREF (0.5 x VCC ~ 2.5 V). Input impedance 60 kohm typical. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Stereo audio ADC (I2S) |+| Resolution | 24-bit |+| Sample rate | up to 96 kHz |+| Input | single-ended line-level (L/R) |+| Architecture | delta-sigma, 64x oversampling |+| Output | I2S (BCK/LRCK/DOUT) |+| SNR | 99 dB |+| Package | TSSOP-14 |++## Ordering variants++- `PCM1808PWR (TSSOP-14)`+- `PCM1808PW (TSSOP-14, tube)`++## CAD (KiCad official)++- Symbol: `PCM1808 (generated from datasheet; KiCad has no symbol)`+- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`+- 3D model: TSSOP-14 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/pcm1808.pdf) (32 pp, sha256 `4ac1a7ec0c05ee97`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/pcm1808-datasheet.pdf)

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