W681513SG Nuvoton Technology Corporation of America, W681513SG Datasheet - Page 31

• Manufacturer Part Number: W681513SG
• Description: IC VOICEBAND CODEC 5V USB 20SOP
• Manufacturer: Nuvoton Technology Corporation of America
• Type: PCMr

Specifications of W681513SG

• Data Interface: PCM Audio Interface
• Resolution (bits): 8 b
• Number Of Adcs / Dacs: 1 / 1
• Sigma Delta: No
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• For Use With: W681513DK - KIT DEVELOPMENT FOR W681513W681512DK - KIT DEVELOPMENT FOR W681512W681511DK - KIT DEVELOPMENT FOR W681511W681512ES - EVALUATION SYSTEM FOR W681512
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

W681513
signal level to the receive telephone handset but, because of the increased gain, the Signal-to-Noise
Ratio (SNR) has decreased and the signal sounds noisier. On the receive side, the gain is set as in
the previous example. When the Power Amp gain is as low as 0.16 a 32 ohm load speaker can be
driven.
Resistor R9 sets the sidetone level (the signal fed back to the earpiece from the microphone so the
telephone sounds “live”) to the level desired by the designer.
Capacitors C6 and C7 are introduced for external compensation to keep the input amplifier stable at
such high gain figures and prevent oscillation. These capacitors are not needed when the gain is
close to unity or less than unity.
Publication Release Date: October, 2005
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Revision A11