WM8781 Datasheet, PDF (1/20 Pages) Wolfson Microelectronics plc – 24-Bit, 192kHz Stereo ADC

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24-Bit, 192kHz Stereo ADC
WM8781
DESCRIPTION
The WM8781 is a high performance, low cost stereo audio
ADC designed for recordable media applications.
The device offers stereo line level inputs along with two
control input pins (FORMAT, IWL) to allow operation of the
audio interface in three industry standard modes. An
internal op-amp is integrated on the front end of the chip to
accommodate analogue input signals greater than 1Vrms.
The device also has a high pass filter to remove residual
DC offsets.
WM8781 offers Master or Slave mode clocking schemes.
A control input pin M/S is used to allow Slave mode
operation or Master mode operation. A stereo 24-bit multi-
bit sigma-delta ADC is used with 128x, 64x or 32x over-
sampling, according to sample rate. Digital audio output
word lengths from 16-24 bits and sampling rates from
8kHz to 192kHz are supported.
The device is a hardware controlled device and is supplied
in a 20-lead SSOP package.
BLOCK DIAGRAM
FEATURES
• SNR 102dB (‘A’ weighted @ 48kHz)
• THD -90dB (at –1dB)
• Sampling Frequency: 8 – 192kHz
• Master or Slave Clocking Mode
• System Clock (MCLK): 128fs, 192fs, 256fs, 384fs, 512fs,
768fs
• Audio Data Interface Modes
- 16-24 bit I²S, 16-24 bit Left, 16-24 bit Right Justified
• Supply Voltages
- Analogue 2.7 to 5.5V
- Digital core: 2.7V to 3.6V
• 20-lead SSOP package
APPLICATIONS
• Recordable DVD Players
• Personal Video Recorders
• STB
• Studio Audio Processing Equipment
WOLFSON MICROELECTRONICS plc
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Production Data, April 2006, Rev 4.1
Copyright 2006 Wolfson Microelectronics plc