WAU8812YG - Mono Audio Codec + Speaker Driver | Nuvoton
MPN: WAU8812YG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.2 | $1.20 |
| 10 | $1.08 | $10.80 |
| 100 | $0.95 | $95.00 |
| 500 | $0.86 | $430.00 |
| 1,000 | $0.78 | $780.00 |
WAU8812YG Overview
An audio codec (coder-decoder) is an integrated circuit that converts analog audio signals to digital form via an ADC and converts digital audio back to analog via a DAC, while providing auxiliary functions such as microphone biasing, volume control, mixing, and in this case a built-in class speaker driver. Codecs sit between analog transducers (microphones, speakers) and digital processors such as MCUs or SoCs in the embedded audio signal chain, typically interfacing through an I2S-style serial port and a control bus for register configuration.
The defining feature of the WAU8812YG is its integrated speaker driver: unlike a bare codec that requires an external amplifier stage, this device can drive a speaker directly, reducing BOM count, board area, and design effort in cost-sensitive voice applications. The 91/93 dB S/N ratio provides adequate fidelity for speech-band and compact audio playback.
Architecturally, the part combines a sigma-delta-style conversion path with on-chip gain stages and mixing, configurable through serial control registers. The exposed-pad 32-QFN package improves thermal dissipation for the speaker driver stage and supports compact surface-mount layouts.
Typical applications include doorbell and intercom voice units, IP phone and handset audio, smart-home voice terminals, alarm and announcement systems, and portable voice-recording devices where a single mono channel with direct speaker drive suffices.
A key design consideration is thermal management: driving a speaker continuously at high output power increases die temperature, so PCB copper connected to the exposed pad should be sized according to the driver output level. Series ferrite beads on speaker lines reduce EMI radiated from switching drive currents.
This page adds distributor-verified availability, alternatives context, application guidance, and design notes that go beyond the raw Nuvoton datasheet content.
Drop-in alternatives for WAU8812YG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
WAU8812
✅ Drop-In📋 Reference alternative (not in catalog)
WAU8822YG
✅ Drop-In📋 Reference alternative (not in catalog)
WAU8812YG Specifications
| Product Type | Mono Audio Codec with Speaker Driver |
| Number of ADCs / DACs | 1 / 1 |
| S/N Ratio ADC (typ) | 91 dB |
| S/N Ratio DAC (typ) | 93 dB |
| Audio Interface | Serial |
| Output Speaker Driver | Integrated |
| Package | 32-QFN-EP (5 x 5 mm) |
| Mounting Type | Surface Mount |
| Series | emPowerAudio |
| Packaging | Tray |
WAU8812YG 32-qfn-ep (5 x 5 mm) Pin Configuration Guide
Pin configuration for WAU8812YG (32-qfn-ep (5 x 5 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for WAU8812YG.
Refer to the datasheet for full pin configuration.
Typical Applications
WAU8812YG is suitable for 6 applications: Video Doorbell and Intercom Voice Path, IP Phone and Handset Audio, Smart-Home Voice Terminals, Alarm and Announcement Systems, Portable Voice Recorders, Industrial Human-Machine Interface (HMI) Audio.
Video Doorbell and Intercom Voice Path
The WAU8812YG fits video doorbells and intercoms because it provides the entire mono voice signal chain in one 32-QFN-EP (5x5 mm) package: a 91 dB S/N ADC digitizes the microphone signal while the 93 dB S/N DAC feeds the integrated speaker driver for ringtone and two-way voice. Designers place it between an electret or MEMS microphone and a small 4-ohm or 8-ohm speaker, connecting the serial audio interface to the doorbell SoC. Because no external amplifier is needed, BOM count and board area shrink in products where cost and size dominate. A trade-off: continuous loud playback raises die temperature, so the exposed pad should couple to a ground pour of adequate copper area.
Recommended
IP Phone and Handset Audio
Enterprise and SOHO IP phones need one clean voice channel per handset, which matches the WAU8812YG mono architecture exactly. The 91 dB ADC S/N preserves intelligible uplink speech after network compression, and the 93 dB DAC plus integrated driver delivers handset or ringer output directly, eliminating a separate class-AB or class-D amplifier stage. The serial audio interface connects to the phone's VoIP processor with standard I2S-style timing, while register-based gain control lets firmware adjust sidetone, ring volume, and mic boost during a call. Designers should budget speaker driver current in the phone's power tree and route speaker returns as a star ground to prevent audible coupling into the microphone path.
Recommended
Smart-Home Voice Terminals
Smart-home panels, thermostats with voice prompts, and hub units use the WAU8812YG where a single mono channel with direct speaker drive is sufficient. The emPowerAudio codec's register-controlled mixing and gain stages let firmware render UI tones, voice assistant replies, and alarm chimes from one DAC path at 93 dB S/N, while the microphone ADC at 91 dB S/N supports voice-command capture. Its 5x5 mm QFN-EP footprint fits behind a front panel without a dedicated audio PCB. Because the speaker driver shares the die with the codec, keep high-current speaker traces short and away from the microphone input; the exposed pad ground connection is the primary path for both heat and return current.
Recommended
Alarm and Announcement Systems
Fire panels, security sirens with voice annunciation, and industrial paging speakers benefit from the WAU8812YG's combination of codec and driver. The 93 dB DAC S/N ensures recorded evacuation messages and alarm tones replay clearly, and the integrated speaker driver can sound alerts directly from the codec output, simplifying certification-relevant audio paths. The serial interface ties into the panel MCU, and register-based volume stepping supports day/night or zone-dependent output levels. In this safety-adjacent context, designers should verify the driver output power against speaker size from the Nuvoton datasheet, add EMI ferrites on speaker leads, and confirm operating temperature range against enclosure conditions before release.
Recommended
Portable Voice Recorders
Battery-powered dictation devices, meeting recorders, and body-worn audio units choose the WAU8812YG for its single-chip record-and-playback capability. The 91 dB ADC captures microphone audio for digital storage, and the same die's DAC and speaker driver enable instant playback review without additional amplification - an important space saving in handheld enclosures. The serial interface connects to the recorder MCU or application processor, and low component count around the codec reduces quiescent-burden parts that matter to battery life. Designers should power the codec from a low-noise LDO rail to protect the 91/93 dB S/N figures, and use the register-controlled mic gain to adapt to different microphone sensitivities.
Recommended
Industrial Human-Machine Interface (HMI) Audio
Factory HMIs, kiosks, and machine annunciators integrate the WAU8812YG to produce operator feedback tones and spoken status messages from a single mono channel. The 93 dB S/N DAC and integrated speaker driver drive a panel-mounted speaker directly from the codec, so the HMI control board needs no audio amplifier section, reducing panel depth and cost. The serial audio interface works with the PLC-adjacent MCU, and register gain control allows field-configurable volume. In electrically noisy industrial cabinets, the codec's analog inputs should use differential or well-filtered microphone wiring, and speaker lines should be kept short with common-mode chokes to maintain the effective S/N performance under EMI from drives and contactors.
Recommended
Recommended Products Summary
Engineering reference data for WAU8812YG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | WAU8812 | WAU8822YG |
|---|---|---|---|
| Package | 32-QFN-EP (5x5 mm) | QFN-32 family (confirm suffix) | 32-QFN (5x5) - same family footprint class |
| Brand | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology |
| Channels (ADC/DAC) | 1 / 1 (mono) | 1 / 1 (mono, same die) | 2 / 2 (stereo) |
| Integrated Speaker Driver | Yes | Yes | Yes (emPowerAudio family) |
| Data Interface | Serial | Serial | Serial |
| Pin-to-Pin Compatibility | Reference | Same die - verify package suffix | Not pin-to-pin - mono vs stereo pinout differs |
Key Differentiators
- Single-chip mono voice solution (vs WAU8822YG)
- Integrated speaker driver eliminates external amplifier (vs Generic mono codec + external class-D amp)
- Balanced 91/93 dB S/N performance (vs WAU8812 (same die))
Design Notes
Estimated: because the WAU8812YG integrates the speaker driver on-die, continuous high-volume playback dissipates driver power plus codec quiescent power in the 5x5 mm QFN-EP. As a rule of thumb, dissipation equals (driver output stage losses) + (VDD x Iq); keep the exposed pad soldered to at least a 2x2 via array into a ground pour and verify die temperature against the datasheet maximum at worst-case volume. If the enclosure is sealed (doorbells, alarm units), derate output level accordingly.
Place the codec close to both the microphone and speaker connectors. Route the microphone input away from speaker and digital serial-audio lines; a ground guard trace around MIC input preserves the 91 dB ADC S/N. Decouple each supply pin with 100 nF ceramic capacitors placed within 2 mm of the pin, plus one bulk capacitor per rail. Connect the exposed pad to a solid ground plane with a minimum 3x3 via array for both thermal and return-current performance.
Do not assume the WAU8822YG (stereo) is a drop-in for this mono part - pinout and register maps differ. Confirm the exact package suffix when ordering (YG denotes the QFN-EP variant). Initialize codec registers before enabling the speaker driver to avoid startup pops: sequence the DAC output gain from minimum upward. Also configure the serial audio interface master/slave mode and sample-rate match with the host before first audio playback, or output will be corrupted.
Compliance Information
Compliance status not stated in the captured verified web data. Nuvoton consumer audio ICs are typically RoHS compliant, but confirm on the official Nuvoton product page before design-in.
