CM119B Part Audit
Thought for 6 sec
I’ll update all 48 terminals from the datasheet, using broad functional groups with Section matching Pin Group, then verify every pin’s number, type, description, orientation, and ordering plus the rendered symbol.
Worked for 4 mins 30 sec
Populated and verified all 48 pins with datasheet-backed electrical types, descriptions, functional groups, matching sections, orientations, and deterministic terminal ordering. Power is Top starting at order 1, Ground is Bottom starting at order 10, and all pin numbers and footprint mappings remain unchanged.
Open item
- The symbol renderer still displays some text glyphs as boxes, although the underlying pin names and metadata are correct.
Provide a concise direct to the point best description for this part based from the datasheet. i don't need a very long but useless description.
Thought for 5 sec
Crystal-free USB 2.0 full-speed audio codec with 16-bit stereo DAC, headphone driver, microphone ADC, S/PDIF output, and 8 GPIOs, in a 48-pin LQFP package.
Update and clean metadata
Apply this description
Normalize manufacturer name
Recheck symbol readability
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Part Audit Report
Scope
Audit of the CM119B published part project against the C-Media CM119B USB Audio Single Chip datasheet, revision 1.0. The datasheet URL stored on the part is a third-party mirror of a manufacturer-authored document because C-Media's current download center does not expose a direct CM119B PDF.
Metadata Inventory
Table
| Field | Current value | Assessment |
|---|---|---|
| MPN | CM119B | Matches datasheet |
| Manufacturer | cmedia | Correct manufacturer; capitalization differs from C-Media branding |
| Description | Highly Integrated USB Audio Single Chip | Matches datasheet title/function |
| Part type | Integrated Circuit | Appropriate |
| Designator prefix | IC | Appropriate |
| Symbol style | parametric-v1 | Present |
| Pin count | 48 | Matches datasheet |
| Package | LQFP-48, 7 x 7 mm body, 0.50 mm pitch | Footprint geometry matches principal package dimensions |
| Datasheet URL | Third-party mirror listed above | Added and verified |
Key Specifications
- Crystal-free USB audio single-chip solution.
- USB 2.0 full-speed and USB Audio Device Class 1.0 compliant.
- Integrated 16-bit stereo DAC, earphone driver, 16-bit ADC, microphone boost, PLL, USB transceiver, oscillator, and regulators.
- 44.1 kHz and 48 kHz playback and recording.
- Eight GPIO pins; EEPROM and external-MCU serial interfaces.
- External analog/digital supply: 4.5 V to 5.5 V, 5 V typical.
- Typical total current consumption: 37.25 mA; suspend current: 1.58 mA.
- LQFP-48 package with nominal 7 x 7 mm body and 0.50 mm lead pitch.
- Overall lead span: 8.90 mm to 9.10 mm.
- Body dimensions: 6.90 mm to 7.10 mm.
- Lead width: 0.20 mm nominal; lead length: 0.45 mm to 0.75 mm.
- Body height: 1.35 mm to 1.45 mm; total height 1.60 mm maximum.
Pinout Cross-Check
All physical pin numbers 1 through 48 are present exactly once and the functional pin names match the datasheet. Duplicate supply/ground names are differentiated in Flux with suffixes (
AVDD_1, AVDD_2, AVSS_1, AVSS_2, DVSS_1, DVSS_2), while retaining the correct physical pin numbers.Pin sequence
1 SPDIFO; 2 DR; 3 DW; 4 SK; 5 CS; 6 MUTER; 7 PWRSEL; 8 DREG18; 9 DREG33; 10 MODE; 11 GPIO2; 12 LEDO; 13 GPIO3; 14 DVSS; 15 GPIO4; 16 GPIO5; 17 GPIO6; 18 MUTEP; 19 BUZZ; 20 GPIO7; 21 LEDR; 22 GPIO8; 23 TEST; 24 AVSS; 25 VBIAS; 26 VREF; 27 MICIN; 28 N.C.; 29 AVDD; 30 LOL; 31 LOBS; 32 LOR; 33 AVSS; 34 AVDD; 35 DVDD; 36 DVSS; 37 AREG36; 38 MSEL; 39 VOLUP; 40 PDSW; 41 USBDP; 42 USBDM; 43 GPIO1; 44 SCLK; 45 MINT; 46 SDAT; 47 MCLK; 48 VOLDN.
Mismatches and Risks
High severity
- All 48 terminal electrical types are
Unspecified. The datasheet distinguishes digital inputs, outputs, bidirectional pins, analog inputs/outputs, power inputs, regulator outputs, grounds, open-drain output, USB signals, and the no-connect pin. - All 48 terminal descriptions are missing. Important behavior such as pull-ups/pull-downs, Schmitt-trigger inputs, 5 V tolerance, drive current, slew-rate control, and open-drain behavior is not represented.
- The rendered schematic symbol is illegible. Pin labels render as overlapping outlined glyph boxes, preventing reliable visual identification despite correct pin-number metadata.
Medium severity
- All terminals lack
Section,Pin Group, explicitPin Orientation, andTerminal Ordermetadata. This prevents functional organization and contributes to poor symbol rendering. - The attached STEP model exists at origin with unit scale and zero rotation, but exact body dimensions, seating, lead alignment, and pin-1 orientation could not be independently measured.
- Footprint lands are 0.30 x 1.45 mm and appear plausible for LQFP-48, but the datasheet does not provide a recommended PCB land pattern, so they cannot be certified as manufacturer-recommended.
- The footprint name
QFP50P900X900X160-48Nencodes the approximately 9 x 9 mm overall lead span, while the molded body is 7 x 7 mm. The actual fab outline correctly uses 7 x 7 mm.
Low severity
- Manufacturer name is stored as
cmediarather thanC-Media. - Duplicate supply/ground terminal designators use
_1and_2suffixes instead of literal duplicate datasheet names. - Courtyard and silkscreen dimensions are library-derived because the datasheet does not specify them.
Footprint Verification
- 48 copper pads, no exposed pad.
- 0.50 mm pitch: pass.
- 7 x 7 mm fabrication body outline: pass.
- Approximately 9 mm lead span: pass.
- Continuous counter-clockwise numbering and correct pin-1 corner marking: pass.
- Pin-1 fab chamfer and silkscreen circle identify the same corner: pass.
- Courtyard: 10.4 x 10.4 mm.
- Land size: 0.30 x 1.45 mm.
Recommended Corrections
- Populate every terminal's datasheet-backed
Pin TypeandPin Description. - Organize terminals into broad functional groups with
Sectionequal toPin Group; use Power first at the top and Ground last at the bottom, with remaining groups distributed left/right. - Assign deterministic terminal order and consistent orientation within each group.
- Repair or replace the rendered symbol so all labels are readable.
- Normalize manufacturer spelling to
C-Media. - Inspect the STEP model in 3D against the 7 x 7 mm body, 9 mm lead span, 1.60 mm maximum height, seating plane, and pin-1 corner.
Overall Assessment
The physical pin mapping and principal footprint geometry are correct. The part is not yet production-quality for schematic use because terminal electrical metadata and descriptions are absent and the rendered symbol is unreadable. The footprint is usable with the caveat that its generic land pattern is not directly specified by the datasheet, and the 3D model still needs a dimensional fit check.
Scope
Metadata Inventory
Key Specifications
Pinout Cross-Check
Pin sequence
Mismatches and Risks
High severity
Medium severity
Low severity
Footprint Verification
Recommended Corrections
Overall Assessment
