Datasheet

73M1903 Data Sheet DS_1903_032
14 Rev. 2.1
Table 5: PLL Power Down
Addr. 00h bit 7
ENFE
Addr. 0Eh bit 6
PwdnPLL
PLL
0 X PLL Power Off
1 0 PLL Power On
1 1 PLL Power Off
Table 6: Examples of NCO Settings
Fs
(kHz)
Dnco1
Nnco1
PsDiv
PsSeq(7:0) PsRst
=Dnco1
-1
Dnco2
Nnco2
PllDiv
PllSeq(7:0) PllRst
=Dnco2
-1
Fvco
(Mhz)
PPM
Fxtal(Mhz)=27.0
7.2 8/125 15 11011010 7 5/96 19 XXX10000 4 33.177600 0
8.0 8/125 15 11011010 7 3/64 21 XXXXX100 2 36.864000 0
2.4*8/7*3
=8.22857142858
8/169
21 10000000 7
3/89
29 XXXXX110 2 37.917160* -3
8.4 8/125 15 11011010 7 5/112 22 XXX10100 4 38.707200 0
9.0 8/125 15 11011010 7 1/24 24 XXXXXXXX 0 41.472000 0
9.6 8/125 15 11011010 7 5/128 25 XXX11010 4 44.236800 0
2.4*10/7*3
=10.2857142857
8/125
15 11011010 7
7/192
27 X1010110 6 47.396571 0
2.4*8/7*4
=10.9714285714
7/50
7 X1000000 6
8/107
13 10100100 7 50.557500* 23
11.2* 7/52 7 X1010100 6 5/71 14 XXX10000 4 51.611538* 38
12.0 8/125 15 11011010 7 1/32 32 XXXXXXXX 0 55.296000 0
12.8* 8/65 8 10000000 7 4/71 17 XXXX1110 3 58.984615* 38
2.4*10/7*4
=13.7142857143
7/80
11 X1010100 6
4/107
26 XXXX1110 3 63.196875* 23
14.4 8/125 15 11011010 7 5/192 38 XXX10100 4 66.355200 0
Fxtal(Mhz)=24.576
7.2 1/10 10 XXXXXXXX 0 2/27 13 XXXXXX10 1 33.177600 0
8.0 1/10 10 XXXXXXXX 0 1/15 15 XXXXXXXX 0 36.864000 0
2.4*8/7*3
=8.22857142858
4/35
8 XXXX1110 3 2/27 13 XXXXXX10 1 37.917257… 0
8.4 1/10 10 XXXXXXXX 0 4/63 15 XXXX1110 3 38.707200 0
9.0 1/10 10 XXXXXXXX 0 8/135 16 11111110 7 41.472000 0
9.6 1/10 10 XXXXXXXX 0 1/18 18 XXXXXXXX 0 44.236800 0
2.4*10/7*3
=10.2857142857 3/28 9 XXXXX100 2 1/18 18 XXXXXXXX 0 47.3965714.. 0
2.4*8/7*4
=10.9714285714 4/35 8 XXXX1110 3 1/18 18 XXXXXXXX 0 50.5563429.. 0
11.2 1/10 10 XXXXXXXX 0 1/21 21 XXXXXXXX 0 51.609600 0
12 1/10 10 XXXXXXXX 0 2/45 22 XXXXXX10 1 55.296000 0
12.8 1/10 10 XXXXXXXX 0 1/24 24 XXXXXXXX 0 58.982400 0
2.4*10/7*4
=13.7142857143 1/7
7 XXXXXXXX 0
1/18
18 XXXXXXXX 0 63.19542… 0
14.4 1/10 10 XXXXXXXX 0 1/27 27 XXXXXXXX 0 66.355200 0
Fxtal(Mhz)=9.216
7.2 1/4 4 XXXXXXXX 0 5/72 14 XXX10100 4 33.177600 0
8.0 1/4 4 XXXXXXXX 0 1/16 16 XXXXXXXX 0 36.864000 0
8.4 1/4 4 XXXXXXXX 0 5/84 16 XXX11110 4 38.707200 0
9.0 1/4 4 XXXXXXXX 0 1/18 18 XXXXXXXX 0 41.472000 0
9.6 1/4 4 XXXXXXXX 0 5/96 19 XXX10000 4 44.236800 0
2.4*8/7*4
=10.9714285714
2/7
6 XXXXXX10 4
5/96
19 XXX10000 4 50.556343 0
11.2 1/4 4 XXXXXXXX 0 5/112 22 XXX10100 4 51.609600 0
12 1/4 4 XXXXXXXX 0 1/24 24 XXXXXXXX 0 55.296000 0