參數(shù)資料
型號: 73M1903C-IMR/F
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQCC32
封裝: LEAD FREE, QFN-32
文件頁數(shù): 11/48頁
文件大小: 487K
代理商: 73M1903C-IMR/F
DS_1903C_033
73M1903C Data Sheet
Rev. 5.0
19
6
Clock Generation
6.1
Crystal Oscillator and Prescaler NCO
The crystal oscillator operates over wide choice of crystals (from 4.9 MHz to 27 MHz) and it is first input to
a Numerically Controlled Oscillator (NCO) -based prescaler (divider) prior to being passed onto an
on-chip PLL. The intent of the prescaler is to convert the crystal oscillator frequency, Fxtal, to a
convenient frequency to be used as a reference frequency, Fref, for the PLL. The NCO prescaler
requires a set of three numbers to be entered through the serial port (Pseq[7:0], Prst[2:0] and Pdvsr[2:0].
The PLL also requires 3 numbers as for programming; Ndvsr[6:0], Nseq[7:0], and Nrst[2:0]. The following
is a brief description of the registers that control the NCOs, PLLs, and sample rates for the 73M1903C IC.
The tables show some examples of the register settings for different clock and sample rates. A more
detailed discussion on how these values are derived can be found in Appendix B.
VCO
Kvco
PFD
Charge
Pump
NCO
Kd
Up
Dn
R1
C1
C2
Divide
by 2/1
Ichp Control
3
0
Fref
Kvco Control
NCO
prescaler
FXtal
1
FrcVco
LockDet
System
Clock
3
Figure 6: Clock Generation
Table 5: Clock Generation Register Settings for Fxtal = 27 MHz
Reg Address
Fs(kHz)
8h 9h Ah Bh Ch Dh*
Ichp
(μA)
Kvco
[2:0]
7.2
DA EF 20 13 10 C4
8
0
8.0
DA EF 31 15 04 C2
10
1
2.4*8/7*3 = 8.22857142858
80 F5 41 1D 06 C2
12
1
8.4
DA EF 31 16 14 C4
10
1
9.0
DA EF 31 18 XX C0
10
1
9.6
DA EF 32 19 1A C4
10
2
2.4*10/7*3 = 10.2857142857
DA EF 43 1B 54 C6
12
3
2.4*8/7*4 = 10.9714285714*
40 C7 23 0D A4 C7
8
3
11.2*
54 C7 23 0E 10 C4
8
3
12.0
DA EF 24 20 XX C0
8
4
12.8*
80 E8 15 11 0E C3
6
5
2.4*10/7*4 = 13.7142857143
54 CB 26 1A 0E C3
8
6
14.4
DA EF 46 26 14 C4
12
6
16.0
A4 E9 17 19 1A C4
6
7
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