WECA W6810DK
2727 N First Street, San Jose CA 95134
15
W6810 Conversion to W6811.
The W6811 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 a
separated analog (5V) and digital (3V) power supplies. 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.
The W6811 includes an on-chip precision voltage reference and an additional power amplifier,
Capable of driving 300 ohm 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.
For evaluation of the W6811, use W6810DK prototype area to connect the W6811 to
W6810 socket as shown below (only if it is desired to connect a separate 3V power
supply for digital I/O otherwise use the direct connection below)
R1
33K
C1
.1UF
C4
100uF
L1
INDUCTOR
C3
47UF Tant
C2
47UF Tant
VDDD
U3A
MC74HC244ADW
10
20
12
14
16
18
2
4
6
8
1
GND
V
CC
Y3
Y2
Y1
Y0
A0
A1
A2
A3
OE
+
VCCD
+
U2
W6811
1
2
3
4
5
6
7
8
9
10
24
23
22
21
20
19
18
17
16
15
11
12
14
13
Vref
RO-
PAI
PAO-
PAO+
VDDA
NC
VDDD
FSR
PCMR
VAG
AI+
AI-
AO
U/A
VSS
NC
VSSD
FST
PCMT
BCLKR
PUI
BCLKT
MCLK
VDDD
U1
W6810
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Vref
RO
PAI
PAO-
PAO+
VDD
FSR
PCMI
BCLKR
PUI
VAG
AI+
AI-
AO
U/A
VSS
FSX
PCMO
BCLKT
MCLK
JP1
1
2
U3B
MC74HC244ADW
10
20
3
5
7
9
11
13
15
17
19
GND
V
CC
Y3
Y2
Y1
Y0
A0
A1
A2
A3
OE
VDDD
U1
LT1521-3
8
5
1
2
3
6
7
IN
SHDN
3.0V
SENSE
GND
GND
GND
+5V
