Stereo Codec with Video Buffer

The WM8946 is a highly integrated low power hi-fi codec designed for portable devices such as digital still cameras. Up to six analog inputs may be connected, and a two-channel digital microphone interface is also provided. Flexible output mixing options support single-ended and differential configurations, with outputs derived from the digital audio paths or from analog bypass paths. Twin stereo outputs or stereo line and mono BTL headphone/speaker drive may be supported. Flexible digital mixing and powerful DSP functions are available. Programmable filters and other processes may be applied to the ADC and DAC signal paths simultaneously. The DSP functions include 3D-stereo enhancement, five notch filters, five-band EQ, dynamic range control and the Cirrus Logic ReTune™ feature. The ReTune™ feature is a sophisticated digital filter that can compensate for imperfect characteristics of the housing, loudspeaker or microphone components in an application. The ReTune™ algorithm can provide acoustic equalization and selective phase (delay) control of specific frequency bands. The WM8946 is controlled via a I²C or SPI interface. Additional functions include Digital beep generator, video buffer, programmable GPIO functions, Frequency Locked Loop (FLL) for flexible clocking support and integrated LDO for low noise supply regulation. The WM8946 is supplied in 36-ball W-CSP package, ideal for portable systems.

Features

  • Hi-fi audio codec
    • 94 dB SNR during ADC recording (‘A’ weighted)
    • 98 dB SNR during DAC playback (‘A’ weighted)
  • 6 analog audio inputs
  • Integrated bias reference for electret microphones
  • 2-channel digital microphone interface
  • Powerful digital mixing / DSP functions:
    • 3D-stereo enhancement
    • 5-notch filters
    • 5-band equalizer (EQ)
    • ReTune™ parametric filter
    • Dynamic range control and noise gate
    • Low-pass/High-pass filters
    • Direct Form 1 (DF1) programmable digital filter
  • Digital beep generator
  • 4 analog audio outputs
  • Stereo line output
  • Mono BTL headphone/speaker output driver
  • I²S digital audio interface - sample rates 8kHz to 48kHz
  • Frequency Locked Loop (FLL) frequency conversion / filter
  • Video buffer function
  • Integrated LDO low-noise voltage regulator
  • 36-ball W-CSP package (2.96 x 3.07 x 0.7mm, 0.5mm pitch)- CSP package (4.158 x 3.876 x 0.607mm)

Parametric Specifications

DACs 2
ADCs 2
DAC SNR (dB) 96
ADC SNR (dB) 94
DAC THD+N (dB) -76
ADC THD+N (dB) -77
Sample Rate (kHz) 8-48
Analog Power Supply (V) 2.4-3.6
Supply Current (µA) 1.71-3.6
Package 36 WLCSP

Technical Documents

WM8946 Product Datasheet

May 26, 2016, v4.5 : 3081 Kb

Design Resources

WAN_0240 I²S USB Audio Streaming

Sep 1, 2010, WAN0240 rev 1.0 : 1187 Kb

WAN_0218 Implementing ReTune™ with Wolfson Audio CODECs

Aug 1, 2010, WAN0218 rev 1.1 : 1882 Kb

WAN_0215 DRC Operation in Wolfson Audio CODECs

Mar 1, 2010, WAN0215 rev 1.0 : 218 Kb

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Comprehensive Solutions