Wcd9341 — Datasheet !!exclusive!!

The Ultimate Guide to the WCD9341 Datasheet: Audio Perfection for Flagship Snapdragon

5. Applications and Use Cases

The WCD9341 was widely adopted in the premium smartphone market between 2017 and 2019. It was most notably found in devices utilizing the Qualcomm Snapdragon 845 platform (e.g., Google Pixel 3, OnePlus 6, Samsung Galaxy S9/S9+ in certain regions) and the Snapdragon 855 platform.

Its primary use cases included:

• Flagship Smartphones: Providing the main audio processing for music and calls.
• Audio Dongles: USB-C to 3.5mm adapters often utilize compact codecs, and the feature set of the WCD9341 (specifically its ability to drive high-impedance headphones) made it a candidate for high-end audio dongles.

5.1 Required External Components

• Inductors: Two 2.2 µH inductors (0402 size, low DCR < 0.1Ω) for the charge pump.
• Capacitors:
  • 10 µF X5R ceramic on VDD_HPH.
  • 100 nF decoupling caps on every power pin.
• Crystals: Optional 19.2 MHz if internal PLL is bypassed.

4.1 Class-H Headphone Amplifier

Unlike Class-G or Class-AB, Class-H dynamically modulates the supply voltage to the output stage based on audio envelope, with feed-forward prediction (via audio DSP). Datasheet claims: wcd9341 datasheet

• Power savings: 30–50% vs fixed 1.8V rail at moderate listening levels.
• Pop/click suppression: separate ramp-up sequence for HPH_REF pin.

Implementation detail: Requires external 2.2 µF bootstrap capacitor on CP_OUT and 4.7 µF on VDD_CP. Missing these causes audible thumps. The Ultimate Guide to the WCD9341 Datasheet: Audio

8. Obtaining the Datasheet

The WCD9341 datasheet is not publicly available due to Qualcomm’s proprietary distribution policy. Access typically requires: WAV: Full native decoding support

• A signed Non-Disclosure Agreement (NDA) with Qualcomm.
• A valid business account on the Qualcomm CreatePoint portal.
• Partnership with an OEM or module manufacturer using Snapdragon processors.

Unofficial summaries exist from reverse engineering (e.g., from LineageOS or AOSP hardware code), but for hardware design, you must obtain the official document.

Documentation & compliance

• Keep the datasheet, panel spec, and revision notes together in your project repo.
• Verify compliance with any required regulatory or safety standards (e.g., RoHS declared materials, EMI limits).

2. Advanced DAC Architecture

• Stereo High-Performance DAC: 130 dB SNR (typical, A-weighted)
• THD+N (Total Harmonic Distortion + Noise): -108 dB (typical)
• Dynamic Range: > 120 dB
• Oversampling Digital Filter: With selectable roll-off characteristics (Sharp, Slow, etc.)

Audio Performance

• Hi-Fi Grade Audio: The WCD9341 supports High-Resolution Audio playback. It typically features a Signal-to-Noise Ratio (SNR) of approximately 100dB to 115dB (depending on the specific output path), ensuring clear sound with minimal background hiss.
• Native Sample Rates: It supports standard audio sample rates (44.1kHz, 48kHz) up to high-resolution rates (96kHz, 192kHz), allowing for audiophile-grade music reproduction.
• Native DSD Support: A standout feature in the datasheet is support for Direct Stream Digital (DSD) audio, a high-resolution audio format often favored by audiophiles, allowing for bit-perfect playback without converting to PCM first.

1. High-Resolution Audio Support

• PCM (Pulse Code Modulation): Up to 32-bit / 384 kHz
• DSD (Direct Stream Digital): Native DSD64, DSD128, and DSD256 (DoP - DSD over PCM)
• FLAC, ALAC, AIFF, WAV: Full native decoding support