W681513_05 Datasheet, PDF (2/35 Pages) Winbond – 5V SINGLE-CHANNEL VOICEBAND CODEC FOR USB APPLICATIONS

W681513
1. GENERAL DESCRIPTION
The W681513 is a single channel PCM CODEC with pin-selectable μ-Law or A-Law companding
dedicated to the USB accessory market by supporting a derivative 2MHz clock. The device is
compliant with the ITU G.712 specification. It operates from a single +5V power supply and is
available in 20-pin SOP package option. 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. W681513 performance is specified over the industrial
temperature range of –40°C to +85°C.
The W681513 includes an on-chip precision voltage reference and an additional power amplifier,
capable of driving 300Ω 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. W681513 accepts 2MHz
master clock rate, and an on-chip pre-scaler automatically determines the division ratio for the
required internal clock.
2. FEATURES
• Single +5V power supply
• Typical power dissipation of 30 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 (775mV_RMS)
• Push-pull power amplifiers with external
gain adjustment with 300 Ω load capability
• Master clock rate supports 2.000MHz
clock for USB applications
• 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 SOP (SOG)
• Pb-Free / RoHS package option available
Applications
• Soft phones running on a PC (VoInternet):
o USB Phones
o USB to PSTN Gateway
• USB Microphones
• USB Headset for PC and Game Consoles
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