WM8972L Datasheet, PDF (1/49 Pages) Wolfson Microelectronics plc – MONO CODEC FOR PORTABLE AUDIO APPLICATIONS

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WM8972L
Mono CODEC for Portable Audio Applications
DESCRIPTION
The WM8972L is a low power, high quality mono CODEC
designed for portable digital audio applications.
The device integrates complete interfaces to mono
microphones. External component requirements are
drastically reduced as no separate microphone amplifiers
are required. Advanced on-chip digital signal processing
performs graphic equaliser and automatic level control for
the microphone or line input.
The WM8972L can operate as a master or a slave, with
various master clock frequencies including 12 or 24MHz for
USB devices, or standard 256fs rates like 12.288MHz and
24.576MHz. Different audio sample rates such as 96kHz,
48kHz, 44.1kHz are generated directly from the master
clock without the need for an external PLL.
The WM8972L operates at supply voltages down to 1.8V,
although the digital core can operate at voltages down to
1.42V to save power, and the maximum for all supplies is
3.6 Volts. Different sections of the chip can also be powered
down under software control.
The WM8972L is supplied in a very small and thin 5x5mm
QFN package, ideal for use in hand-held and portable
systems.
BLOCK DIAGRAM
FEATURES
• DAC SNR 98dB (‘A’ weighted), THD –84dB at 48kHz, 3.3V
• ADC SNR 95dB (‘A’ weighted), THD -82dB at 48kHz, 3.3V
• Complete Mono Microphone Interface
- Programmable ALC / Noise Gate
• On-chip 400mW BTL Speaker Driver (mono)
• Digital Graphic Equaliser
• Low Power
- 7mW mono playback (1.8V / 1.5V supplies)
- 14mW record & playback (1.8V / 1.5V supplies)
• Low Supply Voltages
- Analogue 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
- Digital I/O: 1.8V to 3.6V
• 256fs / 384fs or USB master clock rates: 12MHz, 24MHz
• Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48,
88.2, 96kHz generated internally from master clock
• 5x5x0.9mm QFN package
APPLICATIONS
• Digital Still Cameras
• Toys
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Preliminary Technical Data, June 2004, Rev 2.2
Copyright 2004 Wolfson Microelectronics plc