Low-Power V.32 bis Modem
CMX869B
4.1
Power Supply Connections
DV
SS
AV
SS
AV
PWR
AV
SS
L2
+
C1
AV
DD
C2
24
23
22
3
21
4
20
5
6
CMX869B
19
18
7
8
17
16
9
10
15
11
14
12
13
1
2
DV
DD
+
V
DEC
C7
DV
SS
AV
SS
+
C3
C8
C4
DV
PWR
L1
DV
SS
V
BIAS
C9
ANALOGUE
C2, C9
C1
L2
100nF
10uF
100nH (optional)
C4, C7
C3, C8
L1
DIGITAL
100nF
10uF
100nH (optional)
Figure 2b Recommended Power Supply Connections and De-coupling
The inductors L1 and L2 can be omitted but this may degrade system performance.
Ensure that the length of the tracks between capacitors C2, C4, C7 and C9 and their corresponding
CMX869B device pins (pins 12, 23, 20 and 13) are kept as short as possible.
©
2008 CML Microsystems Plc
8
D/869B/3
CMLMICRO [ CML MICROCIRCUITS ]
