Part Data Review and Verification

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I reviewed the available part metadata, the terminal-based schematic symbol, the PCB footprint summary, and the official AKM product page/PDF.
Part information review

Table

FieldProject / current dataOfficial source checkResult
MPNAK4499EXEQMatches AKM official marking/codeOK
ManufacturerAsahi Kasei Microdevices Corporation (AKM)Matches official sourceOK
PackageProject description says 64-pin HTQFPOfficial brief says 64-pin HTQFP10x10Mostly OK, could be made more specific
Pin countProject description says 64-pinOfficial brief says 64-pinOK
Datasheet URLAlready set in project as https://www.akm.com/us/en/products/audio/audio-dac/ak4499exeq/Official page found; official PDF also foundOK, no update needed
DescriptionProject says premium switched-R stereo DAC, suited for high-res audio and AK4191EQ pairingMatches official brief/product pageOK
Official datasheet / brief found
Because a datasheet URL was already present, I did not change the part property.
Key specs from the official AKM brief

Table

SpecValue
Device typeStereo switched-resistor DAC
TechnologyVELVETSOUND / Switched Resistor DAC
THD+N-124 dB
Dynamic range / SNR138 dB mono, 135 dB stereo
Digital interface7-bit multi-bit modulator data interface
SuppliesTVDD 1.7 to 3.6 V, DVDD 1.7 to 1.98 V, AVDD 4.75 to 5.25 V, VDDL/R 4.75 to 5.25 V
Temp range-40 to 85 C
Package64-pin HTQFP10x10, 0.50 mm pitch
Symbol / footprint / pin cross-check

Table

AreaWhat I foundResult
Symbol pin namingThe symbol uses names consistent with the official brief: power rails, reference pins, control pins, clock/data pins, and analog outputs all line up at a high levelLooks good
Symbol pin countThe symbol contains 65 terminals in the projectPotential issue
Footprint pad countThe layout shows 65 padsPotential issue
Official package statementOfficial AKM brief says 64-pin HTQFPPossible mismatch vs project's 65 terminals/pads
Pin descriptions / typesNames and broad directions are generally sensible, but I could not extract a complete authoritative pin-by-pin function table from the brief alonePartial verification only
Mismatches / flags

Table

FlagSeverityDetails
Extra terminal/pad vs official 64-pin packageHighThe project currently has 65 terminals/pads, including TAB (VSS). The official AKM brief clearly states 64-pin HTQFP, and I could not confirm an exposed pad/tab from the official brief. This is the main discrepancy to resolve.
Description overstates SNR if read as stereoMediumThe project description says 138 dB SNR without qualification. Officially that is mono mode; stereo mode is 135 dB.
Package property could be more specificLowCurrent description says 64-pin HTQFP. Official naming is 64-pin HTQFP10x10 with 0.50 mm pitch.
Bottom line
  • The MPN, manufacturer, general description, and package family are correct.
  • The main issue is that the part project appears to model 65 terminals / 65 pads, while the official AKM brief identifies the device as 64-pin HTQFP.
  • The performance description should be corrected so 138 dB is clearly marked as mono mode, with 135 dB stereo.
If you want, I can next do one of these:
  • update the description/properties to match the official wording more closely
  • inspect every terminal one-by-one against a fuller datasheet source
  • help remove or justify the extra TAB (VSS) pad if it's incorrect
Fix pad count mismatch
Tighten part metadata
Check every pin
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AK4499EXEQ

Premium Switched Resistor Stereo DAC. 138 dB SNR mono mode; 135 dB stereo mode, -124dB THD+N. 64-pin HTQFP10x10 0.50 mm pitch. Suitable for high-resolution audio sources, Network Audio, and USB DACs. Designed for use with AK4191EQ.

Properties

AK4499EXEQ

Asahi Kasei Microdevices Corporation (AKM)

Integrated Circuits

akm.com/us/en/products/audio/audio-dac/ak4499exeq/

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