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WM8781
24-Bit, 192kHz Stereo ADC
WOLFSON MICROELECTRONICS plc
T
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Production Data, January 2012, Rev 4.5
Copyright 2012 Wolfson Microelectronics plc
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 1V
rms
.
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.
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 I
2
S, 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
BLOCK DIAGRAM
WM8781 Production Data
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PD, January 2012, Rev 4.5
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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
THERMAL PERFORMANCE ................................................................................. 5
RECOMMENDED OPERATING CONDITIONS ..................................................... 5
ELECTRICAL CHARACTERISTICS ..................................................................... 6
TERMINOLOGY ............................................................................................................... 7
SIGNAL TIMING REQUIREMENTS ...................................................................... 8
DEVICE DESCRIPTION ...................................................................................... 10
INTRODUCTION ............................................................................................................ 10
ADC ................................................................................................................................ 10
ADC DIGITAL FILTER ................................................................................................... 10
DIGITAL AUDIO INTERFACE ........................................................................................ 11
POWER DOWN CONTROL ........................................................................................... 14
POWER ON RESET ...................................................................................................... 14
DIGITAL FILTER CHARACTERISTICS .............................................................. 16
ADC FILTER RESPONSES ........................................................................................... 16
ADC HIGH PASS FILTER .............................................................................................. 17
APPLICATIONS INFORMATION ........................................................................ 18
RECOMMENDED EXTERNAL COMPONENTS ............................................................ 18
RECOMMENDED EXTERNAL COMPONENTS VALUES ............................................. 18
PACKAGE DIAGRAM ......................................................................................... 19
IMPORTANT NOTICE ......................................................................................... 20
ADDRESS: ..................................................................................................................... 20
Production Data WM8781
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PD, January 2012, Rev 4.5
3
PIN CONFIGURATION
1
MCLK
2
3
VREFGND
4
5
VREFP
6
7
AVDD
8
AINR
9
AGND
10
AINOPR
AINOPL
COM
AINL
M/S
BCLK
FSAMPEN
IWL
LRCLK
DGND
DOUT
DVDD
VMID
FORMAT
11
12
13
14
15
16
17
20
19
18
ORDERING INFORMATION
DEVICE TEMPERATURE
RANGE
PACKAGE MOISTURE SENSITIVITY
LEVEL
PEAK SOLDERING
TEMPERATURE
WM8781GEDS/V -25C to +85C
20-lead SSOP
(Pb-free)
MSL3 260
o
C
WM8781GEDS/RV -25C to +85C 20-lead SSOP
(Pb-free, tape and reel)
MSL3 260
o
C
Note:
Reel quantity = 2,000

WM8781GEDS/V

Mfr. #:
Manufacturer:
Cirrus Logic
Description:
Audio A/D Converter ICs STEREO ADC W/384FS MASTER MODE
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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