Data Sheet

ISM14585-L35 Specification
DOC-DS-14585-201807-3.0
Confidential Inventek Systems
Page 89
The PCM_DIV_REG calculations show the following use cases, with 8 bits, 16 bits, 32
bits and 48 bits.
XTAL 16000 kHz
Alternatively
Sample
Rate
Bits
Desired Bit
Clock kHz
Desired Divider
Actual
Divider
8
1*8
64
250
250
Actual
Word size
Divider: Integer
and Fractional
Part
8
1*16
128
125
125
8
=250
8
1*24
192
83,33333333
80
16
=125
8
1*32
256
62,5
50
25
=83 + 1/3
8
2*8
128
125
125
40
=62 + 1/2
8
2*16
256
62,5
50
8
=125
8
2*24
384
41,66666667
40
20
=62 + 1/2
8
2*32
512
31,25
25
25
=41 + 2/3
16
1*8
128
125
125
40
=31 + 1/4
16
1*16
256
62,5
50
8
=125
16
1*24
384
41,66666667
40
20
=62 + 1/2
16
1*32
512
31,25
25
25
=41 + 2/3
16
2*8
256
62,5
50
40
=31 + 1/4
16
2*16
512
31,25
25
10
=62 + 1/2
16
2*24
768
20,83333333
20
20
=31 + 1/4
16
2*32
1024
15,625
10
25
=20 + 5/6
32
1*8
256
62,5
50
50
=15 + 5/8
32
1*16
512
31,25
25
10
=62 + 1/2
32
1*24
768
20,83333333
20
20
=31 + 1/4
32
1*32
1024
15,625
10
25
=20 + 5/6
32
2*8
512
31,25
25
50
=15 + 5/8
32
2*16
1024
15,625
10
10
=31 + 1/4
32
2*24
1536
10,41666667
10
25
=15 + 5/8
32
2*32
2048
7,8125
5
25
=10 + 5/12
48
1*8
384
41,66666667
N/A
50
=7 + 13/16
48
1*16
768
20,83333333
N/A
N/A
=41 + 2/3
48
1*24
1152
13,88888889
N/A
N/A
=20 + 5/6
48
1*32
1536
10,41666667
N/A
N/A
=13 + 8/9
48
2*8
768
20,83333333
N/A
N/A
=10 + 5/12
48
2*16
1536
10,41666667
N/A
N/A
=20 + 5/6
48
2*24
2304
6,944444444
N/A
N/A
=10 + 5/12
48
2*32
3072
5,208333333
N/A
N/A
N/A
Integer PCM_DIV_REG values for given frequencies and sample rates