CMX649 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX649' PDF : 50 Pages View PDF
ADM Codec
CMX649
When selecting divider settings to arrive at a desired bit rate from a given crystal frequency, note that
some power savings are realized by selecting a lower divider value in conjunction with a higher prescaler
value, thus minimizing the frequency of the prescaler output.
Divider values
Register bits
clk ctrl[5:3]
[2:0]
Bit Rate (kbps) Settings with Bit Rate Prescaler = 1
Crystal vs Divider chart for CMX649
1
2
2.25
2.625
3
3.125
Crystal
000
001
010
011
100
101
Freq MHz clk ctrl[7:6]
4
00
62.500 31.250 27.778 23.810 20.833 20.000
4.032
00
63.000 31.500 28.000 24.000 21.000 20.160
4.096
00
64.000 32.000 28.444 24.381 21.333 20.480
8
00
125.000 62.500 55.556 47.619 41.667 40.000
8.064
00
126.000 63.000 56.000 48.000 42.000 40.320
8.192
00
128.000 64.000 56.889 48.762 42.667 40.960
3.375
110
18.519
18.667
18.963
37.037
37.333
37.926
3.5
111
17.857
18.000
18.286
35.714
36.000
36.571
Applicable Bit Rate (kbps) Settings with Bit Rate Prescaler = 2
Crystal vs Divider chart for CMX649
Divider values
1
2
2.25
2.625
3
3.125
Register bits
clk ctrl[5:3]
[2:0]
Crystal
000
001
010
011
100
101
Freq MHz clk ctrl[7:6]
4
01
31.250 15.625
4.032
01
31.500 15.750
4.096
01
32.000 16.000
8
01
62.500 31.250 27.778 23.810 20.833 20.000
8.064
01
63.000 31.500 28.000 24.000 21.000 20.160
8.192
01
64.000 32.000 28.444 24.381 21.333 20.480
11.2896
01
88.200 44.100 39.200 33.600 29.400 28.224
12
01
93.750 46.875 41.667 35.714 31.250 30.000
12.096
01
94.500 47.250 42.000 36.000 31.500 30.240
12.288
01
96.000 48.000 42.667 36.571 32.000 30.720
16
01
125.000 62.500 55.556 47.619 41.667 40.000
16.128
01
126.000 63.000 56.000 48.000 42.000 40.320
16.384
01
128.000 64.000 56.889 48.762 42.667 40.960
3.375
110
18.519
18.667
18.963
26.133
27.778
28.000
28.444
37.037
37.333
37.926
3.5
111
17.857
18.000
18.286
25.200
26.786
27.000
27.429
35.714
36.000
36.571
© 2003 CML Microsystems Plc
40
D/649/2
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