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DESCRIPTION

The WM8737L is a low power stereo audio ADC designed

specifically for portable applications such as minidisc and

memory audio / voice recorders.

The device offers three sets of stereo inputs, which can be

configured for line-level signals, for internal or table-top

microphones, or for DC measurement (battery monitor). A

programmable gain amplifier can be used for automatic

level control (ALC) with user programmable hold, attack and

decay times. The device also has a selectable high pass

filter to remove residual DC offsets.

If the signal source is mono, the WM8737L can run in mono

mode, saving power. It can also mix two channels to mono,

either in the analogue or the digital domain.

Master or slave mode clocking schemes are offered. Stereo

24-bit multi-bit sigma-delta ADCs are used with digital audio

output word lengths from 16-32 bits, and sampling rates

from 8kHz to 96kHz supported.

The device is controlled via a 2 or 3 wire serial interface.

The interface provides access to all features including gain

controls, analogue or digital mono mixing, and power

management facilities. The device is supplied in a leadless

5x5mm QFN package.

WM8737L

Stereo ADC with Microphone Preamplifier

FEATURES

鈥?/div>

SNR 97dB (鈥楢鈥?weighted @ 3.3V, 48kHz, normal power

mode)

THD 鈥?5dB (at 鈥?dB, 3.3V, normal power mode)

Complete Stereo / Mono Microphone Interface

- Programmable microphone preamp

- Automatic Level Control

- Low-noise microphone bias voltage

Configurable Power / Performance

Low Power Mode

- 8.5mW at AVDD = 1.8V (stereo, mic preamps off)

- 20mW at AVDD = 3.3V (stereo, mic preamps off)

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, 12, 16, 22.05, 24, 32, 44.1,

48, 88.2, 96kHz generated internally from master clock

32-pin QFN package, 5 x 5 x 0.9mm

鈥?/div>

APPLICATIONS

鈥?/div>

Memory Audio / Voice Recorders

Minidisc Recorders

Portable Digital Music Systems

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

www.wolfsonmicro.com

Advanced Information, May 2004, Rev 3.0

Copyright

餂?004

Wolfson Microelectronics plc

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