W681513SG TR Nuvoton Technology Corporation of America, W681513SG TR Datasheet - Page 30
![IC VOICEBAND CODEC 5V USB 20SOP](/photos/6/80/68097/256-20-sop_sml.jpg)
W681513SG TR
Manufacturer Part Number
W681513SG TR
Description
IC VOICEBAND CODEC 5V USB 20SOP
Manufacturer
Nuvoton Technology Corporation of America
Type
PCMr
Datasheet
1.W681513SG_TR.pdf
(35 pages)
Specifications of W681513SG TR
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
Other names
W681513SG T&R
W681513SG T&R
W681513SG T&R
In the handset application the gain from the handset microphone is set to 27 for the input amplifier.
This is because the acoustical chamber in the telephone type handset lets the electret microphone
provide an output of ~28 mV
one placed with only a small opening to the outside world.) Because of the high sensitivity of the
earphone (150 Ώ impedance) in a typical handset, the output gain from the Power Amp is set to ~0.16
for a satisfactory listening level.
In the VoIP telephone, or small wireless phones, the plastic case is typically too small to provide a
reasonable acoustic chamber. Thus the output from the microphone is less than in the previous
example. This results in having to set the input gain of the CODEC to ~75 to 90 and in a comparable
1.5K
1.5K
SUGGESTED COMPONENT VALUES BY APPLICATION
RMS
COMPONENT #
SCHEMATIC
Figure 11.2 Equivalent Circuit of Figure 11.1
. The chamber typically has a gain of 3 over a bare microphone (or
MICROPHONE
1.0uF
1.0uF
SPEAKER
R3,4
R5,6
C6,7
R9
R7
R8
R3
R4
3.9K
3.9K
PAO-
PAO+
TELEPHONE
HANDSET
R8
SELECT
1200 pF
- 30 -
27K
20K
1K
3K
22uF
3K
PAI
AI-
AI+
R6
C7
C6
R5
AO
62K
330pF
1K
330pF
62K
R7
VoIP PHONE
R9
SELECT
20K
330 pF
SET
91K
20K
select
1K
3K
VAG
0.01uF
VCC
RO+
W681513