Part Review and Datasheet Update

flux

Review complete. I created the detailed report here: Part Review: PCM1822IRTER.
Open items:
  • Datasheet URL was already populated, so I did not replace it.
  • Main mismatch: the datasheet shows WQFN-20 plus one exposed VSS thermal pad, but the symbol/footprint currently exposes five extra VSS pins/pads numbered 21–25.
  • Pin types/descriptions are mostly unset and should be populated from the datasheet.
Suggested next steps:
  1. Replace pins/pads 21–25 with one exposed pad terminal, pin 21 / VSS thermal pad.
  2. Update footprint to 20 perimeter pads + one central exposed pad per TI RTE0020A.
  3. Populate pin types and descriptions from the datasheet table.
  4. Optionally change Mount from Hardware to SMD / surface mount.
adrian95

adrian95

Populate all pin types and descriptions from the datasheet table.

flux

I’ll update each terminal’s Pin Type and Pin Description from the PCM1822 datasheet pin-function table, then verify the properties were applied.

flux

Populated and verified Pin Type and Pin Description for all 25 current terminals from the PCM1822 datasheet table.
Open items:
  • The current part still has five thermal-pad/VSS terminals numbered 21–25; the datasheet represents this as one exposed VSS thermal pad.
Suggested next steps:
  1. Normalize Pin Type values to Flux’s standard ERC options if desired.
  2. Replace VSS_5–VSS_9 with a single exposed-pad terminal/pad.
  3. Re-run the part review after the thermal pad cleanup.
Fix pad, types, review
Fix exposed pad
Normalize pin types
Verify footprint geometry
Run part review
IN2M
Pin Number
4
IN2P
Pin Number
3
VSS_8
Pin Number
24
IN1M
Pin Number
2
VSS_4
Pin Number
20
DREG
Pin Number
14
MD0
Pin Number
12
IN1P
Pin Number
1
FMT0
Pin Number
19
VSS_9
Pin Number
25
MD1
Pin Number
11
AREG
Pin Number
17
SDOUT
Pin Number
6
VSS_3
Pin Number
15
VSS_2
Pin Number
10
VSS_1
Pin Number
5
VSS_7
Pin Number
23
VSS_5
Pin Number
21
BCLK
Pin Number
7
MSZ
Pin Number
13
FSYNC
Pin Number
8
IOVDD
Pin Number
9
AVDD
Pin Number
16
VREF
Pin Number
18
VSS_6
Pin Number
22

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Part Review: PCM1822IRTER
Reviewed Project Metadata
  • Project / part name: PCM1822IRTER
  • Manufacturer part number: PCM1822IRTER
  • Manufacturer: Texas Instruments
  • Description: Stereo, 117-dB SNR, 192-kHz, low-power, hardware-controlled audio ADC
  • Package / case: 20-WQFN / RTE
  • Mount property: Hardware
  • Designator prefix: IC
  • Flux part UID: ea0d9462-bfc2-4e1d-a4c2-756f57494c94
  • Datasheet URL property: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/ea62f2f87a208ce390aec0eebd73f7218b7a67511fc21063e6fe5f6b70bb73ad.pdf
The Datasheet URL property was already populated, so I did not replace it. The document content corresponds to the TI PCM1822 datasheet (SBASAK0, revised May 2022) with a 2026 package addendum for orderable variants.
Datasheet Key Specs
  • Function: Stereo / 2-channel Burr-Brown audio ADC
  • Input support: Differential or single-ended line/microphone inputs
  • Full-scale input: 1 VRMS typical per electrical characteristics
  • Dynamic range / SNR: 117 dB with DRE enabled; 111 dB with DRE disabled
  • THD+N: -95 dB typical
  • Sample rate: 7.35 kHz to 192 kHz output data rate; feature summary states 8 kHz to 192 kHz
  • Audio interface: 32-bit, 2-channel TDM or I2S; master/slave selectable by hardware pins
  • Supplies: AVDD 3.0–3.6 V, nominal 3.3 V; IOVDD 1.65–1.95 V or 3.0–3.6 V; DREG nominal 1.5 V regulator output; AREG nominal 1.8 V regulator output
  • Operating temperature: -40°C to +125°C
  • Orderable status: PCM1822IRTER active production, WQFN (RTE) | 20, 3000-unit large tape-and-reel, MSL 2 / 260°C, marking PC1822
  • Package: RTE0020A, WQFN-20, 3.00 mm × 3.00 mm body, 0.5 mm pitch, 0.8 mm max height, exposed thermal pad
Datasheet Pinout Reference

Table

PinNameTypeDatasheet description
1IN1PAnalog inputAnalog input 1P pin
2IN1MAnalog inputAnalog input 1M pin
3IN2PAnalog inputAnalog input 2P pin
4IN2MAnalog inputAnalog input 2M pin
5VSSAnalog supply / groundShort directly to board ground plane
6SDOUTDigital outputAudio serial data interface bus output
7BCLKDigital I/OAudio serial data interface bus bit clock
8FSYNCDigital I/OAudio serial data interface bus frame sync
9IOVDDDigital supplyDigital I/O supply, nominal 1.8 V or 3.3 V
10VSSAnalog supply / groundShort directly to board ground plane
11MD1Digital inputDevice configuration mode select 1
12MD0Digital inputDevice configuration mode select 0
13MSZDigital inputAudio bus master/slave select
14DREGDigital supplyDigital core regulator output, nominal 1.5 V
15VSSAnalog supply / groundShort directly to board ground plane
16AVDDAnalog supplyAnalog power, nominal 3.3 V
17AREGAnalog supplyAnalog regulator output, nominal 1.8 V
18VREFAnalogAnalog reference voltage filter output
19FMT0Digital inputAudio interface format select, referred to AVDD
20VSSAnalog supply / groundShort directly to board ground plane
Thermal padVSSGround supplyInternal ground; short directly to board ground plane
Symbol Cross-Check
The schematic symbol contains 25 terminal entries: pins 1–20 plus five additional VSS terminals numbered 21–25. Pins 1–20 match the datasheet pin names and numbering:
  • 1 IN1P — matches
  • 2 IN1M — matches
  • 3 IN2P — matches
  • 4 IN2M — matches
  • 5 VSS_1 — matches VSS pin 5
  • 6 SDOUT — matches
  • 7 BCLK — matches
  • 8 FSYNC — matches
  • 9 IOVDD — matches
  • 10 VSS_2 — matches VSS pin 10
  • 11 MD1 — matches
  • 12 MD0 — matches
  • 13 MSZ — matches
  • 14 DREG — matches
  • 15 VSS_3 — matches VSS pin 15
  • 16 AVDD — matches
  • 17 AREG — matches
  • 18 VREF — matches
  • 19 FMT0 — matches
  • 20 VSS_4 — matches VSS pin 20
Symbol Mismatches / Issues
  1. Extra VSS pins 21–25 are not datasheet device pins.
    The datasheet has a single exposed thermal pad associated with VSS, shown as pad 21 in the mechanical drawing / land pattern, not five separate extra electrical VSS pins. The symbol currently creates VSS_5 through VSS_9 with pin numbers 21, 22, 23, 24, and 25. This does not match the datasheet pin function table.
  2. Thermal pad representation is incorrect / over-expanded.
    Recommended representation is one exposed pad terminal, commonly pin 21 or EP, named VSS / thermal pad. The current symbol has five separate VSS terminals beyond pin 20.
  3. Pin Type properties are all Unspecified.
    The datasheet defines analog input, digital input, digital output, digital I/O, analog supply, digital supply, analog reference, and ground supply functions. These should be reflected in pin type / pin description properties.
  4. Pin Description properties are not populated.
    Datasheet descriptions should be added to each terminal for better symbol usability and review quality.
  5. Mount property appears incorrect.
    Current metadata says Mount: Hardware; for a WQFN IC this should likely be SMD / surface mount.
Footprint Cross-Check
Observed layout nodes include pads for pins 1–20 plus VSS_5 through VSS_9 and footprint containers/shapes. The visible footprint outline and silk suggest a compact square WQFN-like package, and the package metadata says 20-WQFN.
Footprint Mismatches / Issues
  1. Pad count is inconsistent with the datasheet footprint model.
    Datasheet package is WQFN-20 with one exposed thermal pad. The project has 25 pad nodes corresponding to 20 pins plus five extra VSS pads. This is not consistent with the datasheet’s 20 peripheral pads + one exposed pad.
  2. Exposed pad should be a single VSS thermal pad.
    Datasheet mechanical drawing labels the exposed pad as 21 and specifies a nominal 1.4 mm square pad / example land pattern with a 1.4 mm square exposed metal region. The current footprint should be corrected to a single central exposed pad if it currently uses multiple VSS pads.
  3. Footprint geometry could not be fully verified from the available structured output.
    The extracted layout SVG showed package outlines and silk but did not expose enough pad geometry detail to confirm every pad dimension, pitch, and exposed-pad size. The critical count/topology mismatch is still clear from the pad node list.
Overall Result
  • MPN / manufacturer / description: Match the TI PCM1822IRTER device family.
  • Package metadata: Mostly matches WQFN-20 / RTE, but the project’s pad count does not.
  • Pins 1–20: Match the datasheet names and numbering.
  • Extra pins/pads 21–25: Mismatch; replace with a single VSS exposed pad / thermal pad terminal.
  • Pin metadata quality: Needs improvement; pin types and pin descriptions are missing or generic.
  1. Replace VSS_5–VSS_9 / pins 21–25 with a single exposed-pad terminal, e.g. EP or VSS_EP, pin number 21, tied to VSS.
  2. Update the footprint to 20 perimeter pads + one central exposed pad matching TI RTE0020A land pattern.
  3. Set Mount to SMD / surface mount if the property options permit it.
  4. Populate each terminal’s Pin Type and Pin Description from the datasheet table.
  5. Optionally replace the Datasheet URL with the direct TI official PDF URL if project policy prefers vendor-hosted links over uploaded PDFs.

  • Reviewed Project Metadata

  • Datasheet Key Specs

  • Datasheet Pinout Reference

  • Symbol Cross-Check

  • Symbol Mismatches / Issues

  • Footprint Cross-Check

  • Footprint Mismatches / Issues

  • Overall Result

  • Recommended Fixes

Documents

  • Part Review: PCM1822IRTER

Assets

PCM1822IRTER

PCM1822IRTER

PCM1822IRTER Symbol.svgDefault
PCM1822IRTER-thumb.png

PCM1822IRTER-thumb.png

PCM1822IRTER-thumbThumbnail
stp

PCM1822IRTER

PCM1822IRTER.stp3D Model
kicad_mod

PCM1822IRTER

PCM1820IRTER.kicad_modFootprint

PCM1822IRTER

PCM1822IRTER thumbnail
ADC, Audio 32 b 8k ~ 192k I2S 20-WQFN (3x3)
The PCM1822 is a high-performance, Burr-Brown™ audio analog-to-digital converter (ADC) that supports simultaneous sampling of up to two analog channels. The device supports single-ended and differential line and microphone inputs with a 1-VRMS full-scale signal. The device integrates a phase-locked loop (PLL), a DC removal high-pass filter (HPF), and supports sample rates up to 192 kHz. The device supports time-division multiplexing (TDM) or I2S audio formats, selectable with the hardware pin level. Additionally, the PCM1822 supports master and slave mode selection for the audio bus interface operation. These integrated high-performance features, along with the ability to be powered from a single supply of 3.3 V, make the device an excellent choice for costsensitive, space-constrained audio systems in far-field microphone recording applications. The PCM1822 is specified from –40°C to +125°C, and is offered in a 20-pin WQFN package.
Features • Stereo high-performance ADC: – 2-channel analog microphones or line-in • ADC line and microphone differential and singleended input performance: – PCM1822 dynamic range: • 117-dB, dynamic range enhancer enabled • 111-dB, dynamic range enhancer disabled – THD+N: –95 dB • 1-VRMS full-scale input • ADC sample rate (fS) = 8 kHz to 192 kHz • Hardware pin control configurations • Linear-phase or low-latency filter selection • Flexible audio serial data interface: – Master or slave interface selection – 32-bits, 2-channel TDM – 32-bits, 2-channel I2S • Automatic power-down upon loss of audio clocks • Integrated high-performance audio PLL • Single-supply operation: 3.3 V • I/O-supply operation: 3.3 V or 1.8 V • Power consumption for 3.3-V AVDD supply: – 19.6 mW/channel at 16-kHz sample rate – 21.3 mW/channel at 48-kHz sample rate
#CommonPartsLibrary #IntegratedCircuit #PCM1822IRTER #TexasInstruments #AudioADC #StereoADC #BurrBrown #I2S #TDM #AudioElectronics #EmbeddedAudio #SmartSpeaker #AVReceiver #HighResolutionAudio #PCBDesign #ElectronicsDesign #SignalProcessing

Properties

PCM1822IRTER

Texas Instruments

Integrated Circuit

ti.com/lit/ds/symlink/pcm1822.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1782324380095&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fpcm1822

IC

Surface Mount

20-WQFN

parametric-v1

creativecommons.org/licenses/by/4.0/

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