100 dB Stereo Codec with Headphone Driver

The WM8758 is a low power, high quality stereo codec featuring integrated pre-amps for stereo differential mics, and drivers for headphone and differential or stereo line output. Separate microphone or headphone amplifiers are not required, and headphone and line common feedback improves crosstalk and noise performance. 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. Additional digital filtering options are available in the ADC path for application filtering such as 'wind noise reduction' and notch filter. Additional power management control enables individual sections of the chip to be powered down under software control.

Technology

Mono/Stereo Codecs

Features

Stereo Codec:

  • DAC SNR 100 dB, THD -86 dB (‘A’ weighted @ 48 kHz)
  • ADC SNR 92.5 dB, THD -75 dB (‘A’ weighted @ 48 kHz)
  • Headphone driver
  • 40mW per channel output power into 16W / 3.3V AVDD2
  • Line output

Mic Preamps:

  • Stereo differential or mono microphone interfaces
  • Programmable preamp gain
  • Psuedo-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
  • Digital playback limiter
  • 5-band equalizer (record or playback)
  • Programmable ADC high pass filter (wind noise reduction)
  • Programmable ADC notch filter
  • PLL supporting various clocks between 8MHz-50MHz
  • Sample rates supported (kHz): 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48
  • low power, low voltage
  • 2.5V to 3.6V analog supplies
  • 1.71V to 3.6V digital supplies
  • 5x5mm 32-lead QFN package

Parametric Specifications

Channels In 2
Channels Out 2
DAC THD+N (dB) -84
ADC THD+N (dB) -75
Analog Power Supply (V) 2.5-3.6
Supply Current (µA) 1.71-3.6
Package 32 QFN

Technical Documents

WM8758B Product Datasheet

Jan 1, 2012, v4.4 : 1384 Kb

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