GENERAL DESCRIPTION

The W6811 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 off of separated analog (5V) and digital (3V) power supplies and is available in 24-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. W6811 performance is specified over the industrial temperature range of –40°C to +85°C.

FEATURES

• Power supply:

• Analog 4.5 – 5.5V

• Digital 2.7 – 3.3V

• Typical power dissipation of 25 mW, power-down mode of 0.5 W

• 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 -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)

• Four packages: 24-pin PDIP, SOG, SSOP, and TSSOP

• Pb-Free / RoHS package options available

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