GENERAL DESCRIPTION
The W681511 is a general-purpose single channel PCM CODEC with pin-selectable μ-Law or A-Law companding. The device is compliant with the ITU G.712 specification. It operates off of a single +5V power supply and is available in 20-pin PDIP, SOG, SSOP, and TSSOP package options. 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. W681511 performance is specified over the industrial temperature range of –40°C to +85°C.

FEATURES
• Single +5V power supply
• Typical power dissipation of 25 mW, power-down mode of 0.5 μW
• Fully-differential analog circuit design
• On-chip precision reference of 1.575 V for a 0 dBm TLP at 600 Ω
• Push-pull power amplifiers with external gain adjustment with 300 Ω load capability
• Seven master clock rates of 256 kHz to 4.096 MHz
• Pin-selectable μ-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 (–40°C to +85°C)
• Package: 20-pin SOG

ApplIcations
• Digital Telephone Systems
• Central Office Equipment (Gateways, Switches, Routers)
• PBX Systems (Gateways, Switches)
• PABX/SOHO Systems
• Local Loop card
• SOHO Routers
• VoIP Terminals
• Enterprise Phones
• ISDN Terminals
• Analog line cards
• Digital Voice Recorders