RALCWI Vocoder
CMX608/CMX618/CMX638
CBUS
IOVDD
C9
VDD
Vss
Vss
Vss
R2
C5
AVDD
48
47
46
45
44
43
42
41
40
39
38
37
1
2
AVDD
AVss
NC
36
35
IOVDD
C7
AVss
IOVDD
C8
AVss
Vss
ENABXTAL
BIAS
3
4
34
33
32
C14
VssREF
XTALSEL3
XTALSEL2
AVss
AVss
INPUT P
INPUT N
5
IOVDD
XTALSEL1
RESETN
IOVDD
AVDD
AVss
CMX618/
CMX638
6
31
D1
IOVDD
C12
R1
C3
AVDD
AVss
7
30
29
28
27
26
25
C4
Vss
8
Vss
AVss
AVss
VssPA
OUT P
OUT N
XTAL out
XTAL in
9
XTAL
10
11
12
C2
C1
Vss
VDDPA
Vss
SYNC
Vss
VDDPA
VDD
Vss
C10
13
14
15
16
17
18
19
20
21
22
23
24
AVss
IOVDD
IOVDD
C11
C6
C13
Vss
Vss
Vss
CODEC PORT
Vss
C1
22pF
22pF
1.0µF
100nF
1.0µF
100nF
C7
C8
C9
100nF
100nF
100nF
C13 100nF
C14 100nF
C2
C3
C4
C5
C6
C10 100nF
C11 1.0µF
C12 100nF
R1
R2
D1
470k
100k
small signal diode
Figure 3 CMX618/CMX638 Recommended External Components
Crystal Select Input Pins:
XTALSEL3 XTALSEL2
Clock/Crystal
Frequency
Clock/Crystal Choice
XTALSEL1
0
0
0
1
1
1
1
0
1
1
0
0
1
1
1
0
1
0
1
0
1
9.6MHz
12.0MHz
14.4MHz
16.8MHz
19.2MHz
21.6MHz
24.0MHz
crystal or clock
crystal or clock
external clock only
external clock only
external clock only
external clock only
external clock only
Table 1 Clock/Crystal Selection
2014 CML Microsystems Plc
10
D/608_18_38/11
CMLMICRO [ CML MICROCIRCUITS ]
