98/95 dB Stereo Codec with Speaker Driver

The WM8983 is a low power stereo codec featuring highly flexible analog mixing functions to enable new applications and combining hi-fi quality audio with voice communication. This IC integrates pre-amps for stereo differential mics, and includes drivers for speaker, headphone and differential or stereo line output. External component requirements are reduced as no separate microphone or headphone amplifiers are required. Advanced on-chip digital signal processing includes a five-band equalizer, a mixed-signal automatic level control for the microphone or line input through the A/D converter, as well as a purely digital limiter function for record or playback. A programmable high pass filter in the ADC path is provided for wind noise reduction and an IIR with programmable coefficients can be used as a notch filter to suppress fixed-frequency noise. The WM8983 digital audio interface can operate in master or slave mode, while an integrated PLL supports flexible clocking schemes. A-law and μ-law companding are fully supported.

Technology

Mono/Stereo Codecs

Features

Stereo Codec:

  • DAC SNR 98 dB, THD -84 dB (‘A’ weighted @ 48 kHz)
  • ADC SNR 95 dB, THD -84 dB (‘A’ weighted @ 48 kHz)
  • Speaker driver (1W into 8W BTL with 5V supply)
    • SNR 90 dB
    • PSRR 80 dB
  • Headphone driver with ‘capless’ option
  • 40mW/channel output power into 16W / 3.3V AVDD2
  • Pop and click suppression

Mic Preamps:

  • Stereo differential or mono microphone interfaces
  • Programmable preamp gain
  • Pseudo-differential inputs with common mode rejection
  • Programmable ALC / noise gate in ADC path
  • Low-noise bias supplied for electret microphones

Other Features:

  • Enhanced 3-D function for improved stereo separation
  • Highly flexible mixing functions
  • 5-band equaliser (ADC or DAC path)
  • ADC programmable high pass filter (wind noise reduction)
  • ADC programmable IIR notch filter
  • Aux inputs for stereo analog input signals or ‘beep’
  • PLL supporting various clocks between 8 MHz-50 MHz
  • Sample rates supported (kHz): 8, 11.025, 16, 12, 16, 22.05, 24, 32, 44.1, 48
  • 2.5V to 3.6V analog supplies
  • 1.71V to 3.6V digital supplies
  • 2.5V to 5.5V speaker supplies
  • 5x5mm 32-lead QFN package

Parametric Specifications

Channels In 2
Channels Out 2
DAC THD+N (dB) -84
ADC THD+N (dB) -84
Analog Power Supply (V) 2.5-3.6
Supply Current (µA) 1.71-3.6
Package 32 QFN

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