Document
W681512
SINGLE-CHANNEL VOICEBAND CODEC
www.DataSheet.co.kr
Data Sheet Revision C17
Datasheet pdf - http://www.DataSheet4U.net/
W681512
1. GENERAL DESCRIPTION
The W681512 is a general-purpose single channel PCM CODEC with pin-selectable -Law or A-Law companding. The device is compliant with the ITU G.712 specification. It operates from a single +5V power supply and is available in 20-pin SOG (SOP), SSOP and TSSOP package. Functions performed include digitization and reconstruction of voice signals, and band limiting and smoothing filters required for PCM systems. The filters are compliant with ITU G.712 specification. W681512 performance is specified over the industrial temperature range of –40C to +85C. The W681512 includes an on-chip precision voltage reference and an additional power amplifier, capable of driving 300 loads differentially up to a level of 6.3V peak-to-peak. The analog section is fully differential, reducing noise and improving the power supply rejection ratio. The data transfer protocol supports both long-frame and short-frame synchronous communications for PCM applications, and IDL and GCI communications for ISDN applications. W681512 accepts seven master clock rates between 256 kHz and 4.096 MHz, and an on-chip pre-scaler automatically determines the division ratio for the required internal clock.
ApplIcations
2. FEATURES
Single +5V power supply Typical power dissipation of 30 mW, power-down mode of 0.5 W Fully-differential analog circuit design and output signals Differential Analog Outputs On-chip precision reference of 1.575 V for a 0 dBm TLP at 600 (775mVRMS) Push-pull power amplifiers with external gain adjustment with 300 load capability Seven master clock rates of 256 kHz to 4.096 MHz Pin-selectable -Law and A-Law companding (compliant with ITU G.711) CODEC A/D and D/A filtering compliant with ITU G.712 Industrial temperature range (–40C to +85C) Pb-Free Packages: 20-pin SOG (SOP), SSOP and TSSOP
www.DataSheet.co.kr
VoIP, Voice over Networks equipment Digital telephone and communication systems Wireless Voice devices DECT/Digital Cordless phones Broadband Access Equipment Bluetooth Headsets Fiber-to-curb equipment Enterprise phones Digital Voice Recorders
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Publication Release Date: January 2011 Revision C17
Datasheet pdf - http://www.DataSheet4U.net/
W681512
3. BLOCK DIAGRAM
Receive PCM Interface
BCLKR FSR PCMR BCLKT FST PCMT
Re Int PC cei erf M ve ace
Transmit PCM Interface
Tra Int ns PC erf mitM ace
G.712 CODEC G.711 /A - Law
PAO+ PAOPAI RORO RO+ AO AI+ AI/A-Law
512 kHz 256 kHz MCLK
256 kHz, 512 kHz, 1536 kHz, 1544 kHz, 2048 kHz, 2560 kHz & 4096 kHz
Pre -Scaler scaler
8 kHz
Voltage reference
V AG
Power Conditioning
www.DataSheet.co.kr
VDD
PUI
VSS
-3-
Publication Release Date: January 2011 Revision C17
Datasheet pdf - http://www.DataSheet4U.net/
W681512
4. TABLE OF CONTENTS
1. GENERAL DESCRIPTION .................................................................................................................. 2 2. FEATURES ......................................................................................................................................... 2 3. BLOCK DIAGRAM ............................................................................................................................... 3 4. TABLE OF CONTENTS ...................................................................................................................... 4 5. PIN CONFIGURATION ....................................................................................................................... 6 6. PIN DESCRIPTION ............................................................................................................................. 7 7. FUNCTIONAL DESCRIPTION ............................................................................................................ 8 7.1. Transmit Path................................................................................................................................. 8 7.2. Receive Path .................................................................................................................................. 9 7.3. Power Management ..................................................................................................................... 10 7.3.1. Analog and Digital Supply ..................................................................................................... 10 7.3.2. Analog Ground Reference Voltage Output............................................................................ 10 7.4. PCM Interface .............................................................................................................................. 10 7.4.1. Long Frame Sync .................................................................................................................. 10 7.4.2. Short Frame Sync ............................