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WM8711 / WM8711L
Internet Audio DAC with Integrated Headphone Amplifier
DESCRIPTION
FEATURES
The WM8711 or WM8711L (WM8711/L) is a low power
stereo DAC with an integrated headphone driver. The
WM8711/L is designed specifically for portable MP3 audio
and speech players. The WM8711/L is also ideal for MD,
CD machines and DAT players.
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Stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8KHz
to 96KHz are supported.
Stereo audio outputs are buffered for driving headphones
from a programmable volume control, line level outputs are
also provided along with anti-thump mute and power
up/down circuitry.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
volume controls, mutes, de-emphasis and extensive power
management facilities. The device is available in a small 28pin SSOP package or the smaller 28-Pin QFN (5x5x0.9 mm
Body) package.
A USB mode is provided where all audio rates can be
derived from a single 12MHz or 24MHz MCLK, saving on
the need for a PLL or multiple crystals.
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Audio Performance
- DAC SNR 100dB (‘A’ weighted) at AVDD = 3.3V
- DAC SNR 90dB (‘A’ weighted) at AVDD = 1.8V
(WM8711L)
Low Power Headphone Playback
- Down to 20mW at 3.3V
- Down to 6mW at 1.8V (WM8711L)
- 1.42 – 3.6V Digital Supply Operation
- 2.7 – 3.6 V Analogue Supply Operation
- 1.8 – 3.6 V Analogue Supply Operation (‘L’ Variant)
DAC Sampling Frequency: 8KHz – 96KHz
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
- I2S, Left, Right Justified or DSP
- 16/20/24/32 bit Word Lengths
- Master or Slave Clocking Mode
Stereo Audio Outputs
Output Volume and Mute Controls
Highly Efficient Headphone Driver
28-Pin SSOP or 28-Pin QFN (5x5x0.9 mm) package
APPLICATIONS
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Portable MP3 Players
CD and Minidisc Players
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data June 2004, Rev 4.0
Copyright 2004 Wolfson Microelectronics plc
