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Wolfson Microelectronics

WM8750BL Datasheet Preview

WM8750BL Datasheet

Stereo CODEC

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WM8750BL
Stereo CODEC for Portable Audio Applications
DESCRIPTION
The WM8750BL is a low power, high quality stereo CODEC
designed for portable digital audio applications.
The device integrates complete interfaces to stereo or mono
microphones and a stereo headphone. External component
requirements are drastically reduced as no separate
microphone or headphone amplifiers are required.
Advanced on-chip digital signal processing performs graphic
equaliser, 3-D sound enhancement and automatic level
control for the microphone or line input.
The WM8750BL 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 WM8750BL 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 WM8750BL 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 97dB (‘A’ weighted), THD -85dB at 48kHz, 3.3V
ADC SNR 88dB (‘A’ weighted), THD -80dB at 48kHz, 3.3V
Complete Stereo / Mono Microphone Interface
- Programmable ALC / Noise Gate
On-chip 400mW BTL Speaker Driver (mono)
On-chip Headphone Driver
- >40mW output power on 16/ 3.3V
- THD –73dB at 5mW, SNR 98dB with 16load
- No DC blocking capacitors required (capless mode)
Separately mixed mono output
Digital Graphic Equaliser
Low Power
- 6 mW stereo playback (1.8V / 1.5V supplies)
- 13 mW 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
Portable Media Player
Mobile phone handsets
Mobile gaming
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, August 2012, Rev 4.1
Copyright 2012 Wolfson Microelectronics plc




Wolfson Microelectronics

WM8750BL Datasheet Preview

WM8750BL Datasheet

Stereo CODEC

No Preview Available !

WM8750BL
Production Data
TABLE OF CONTENTS
DESCRIPTION ................................................................................................................... 1 
FEATURES......................................................................................................................... 1 
APPLICATIONS ................................................................................................................. 1 
BLOCK DIAGRAM ............................................................................................................. 1 
TABLE OF CONTENTS ..................................................................................................... 2 
PIN CONFIGURATION....................................................................................................... 3 
ORDERING INFORMATION .............................................................................................. 3 
PIN DESCRIPTION ............................................................................................................ 4 
ABSOLUTE MAXIMUM RATINGS..................................................................................... 5 
RECOMMENDED OPERATION CONDITIONS ................................................................. 5 
ELECTRICAL CHARACTERISTICS .................................................................................. 6 
TYPICAL PERFORMANCE................................................................................................ 8 
POWER CONSUMPTION............................................................................................................... 8 
OUTPUT DRIVERS ........................................................................................................................ 9 
OUTPUT PGA’S LINEARITY ........................................................................................................ 10 
SIGNAL TIMING REQUIREMENTS ................................................................................. 11 
SYSTEM CLOCK TIMING ............................................................................................................ 11 
AUDIO INTERFACE TIMING – MASTER MODE......................................................................... 11 
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................................ 12 
INTERNAL POWER ON RESET CIRCUIT ...................................................................... 15 
DEVICE DESCRIPTION ................................................................................................... 16 
INTRODUCTION........................................................................................................................... 16 
INPUT SIGNAL PATH................................................................................................................... 16 
AUTOMATIC LEVEL CONTROL (ALC)........................................................................................ 23 
OUTPUT SIGNAL PATH............................................................................................................... 27 
ANALOGUE OUTPUTS ................................................................................................................ 32 
ENABLING THE OUTPUTS.......................................................................................................... 34 
HEADPHONE SWITCH ................................................................................................................ 34 
THERMAL SHUTDOWN............................................................................................................... 35 
HEADPHONE OUTPUT................................................................................................................ 36 
DIGITAL AUDIO INTERFACE ...................................................................................................... 37 
AUDIO INTERFACE CONTROL................................................................................................... 41 
CLOCKING AND SAMPLE RATES .............................................................................................. 43 
CONTROL INTERFACE ............................................................................................................... 45 
POWER SUPPLIES ...................................................................................................................... 46 
POWER MANAGEMENT.............................................................................................................. 46 
REGISTER MAP............................................................................................................... 49 
DIGITAL FILTER CHARACTERISTICS........................................................................... 50 
TERMINOLOGY............................................................................................................................ 50 
DAC FILTER RESPONSES.......................................................................................................... 51 
ADC FILTER RESPONSES.......................................................................................................... 52 
DE-EMPHASIS FILTER RESPONSES ........................................................................................ 53 
HIGHPASS FILTER ...................................................................................................................... 54 
APPLICATIONS INFORMATION ..................................................................................... 55 
RECOMMENDED EXTERNAL COMPONENTS .......................................................................... 55 
LINE INPUT CONFIGURATION ................................................................................................... 56 
MICROPHONE INPUT CONFIGURATION .................................................................................. 56 
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS........................................................ 56 
POWER MANAGEMENT EXAMPLES ......................................................................................... 57 
IMPORTANT NOTICE ...................................................................................................... 59 
ADDRESS ..................................................................................................................................... 59 
REVISION HISTORY ........................................................................................................ 60 
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PD, Rev 4.1, August 2012
2


Part Number WM8750BL
Description Stereo CODEC
Maker Wolfson Microelectronics
Total Page 30 Pages
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