參數(shù)資料
型號： MPC92469AC
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 時(shí)鐘產(chǎn)生/分配
英文描述： 400 MHz, OTHER CLOCK GENERATOR, PQFP32
封裝： LEAD FREE, LQFP-32
文件頁數(shù)： 9/12頁
文件大?。?/td> 907K
代理商： MPC92469AC
MPC92469
400MHZ, LOW VOLTAGE, PECL CLOCK SYNTHESIZER W/SPREAD SPECTRUM
IDT / ICS PECL CLOCK SYNTHESIZER W/SPREAD SPECTRUM
6
MPC92469REV 4 JANUARY 23, 2007
PROGRAMMING INTERFACE
Programming the MPC92469
Programming the MPC92469 amounts to properly
configuring the internal PLL dividers to produce the desired
synthesized frequency at the output. The output frequency
can be represented by this formula:
FOUT = (fXTAL ÷ 16) x (M) ÷ (N)
(1)
where fXTAL is the crystal frequency, M is the PLL feedback-
divider and N is the PLL post-divider. The input frequency and
the selection of the feedback divider M is limited by the
VCO-frequency range. fXTAL and M must be configured to
match the VCO frequency range of 400 to 800 MHz in order
to achieve stable PLL operation:
MMIN = fVCO,MIN ÷ fXTAL * 8 and
(2)
MMAX = fVCO,MAX ÷ fXTAL * 8
(3)
For instance, the use of a 16 MHz input frequency requires
the configuration of the PLL feedback divider between
M = 200 and M = 400. Table 7 shows the usable VCO
frequency and M divider range for other example input
frequencies. Assuming that a 16 MHz input frequency is
used, equation 1 reduces to:
FOUT = M ÷ N(4)
Table 7. MPC92469 Frequency Operating Range
MM[8:0]
VCO frequency for a crystal interface frequency of
Output frequency for fXTAL = 16 MHz and for N =
12
14
16
18
20
1
2
4
8
160
010100000
400
170
010101010
425
180
010110100
405
450
190
010111110
427.5
475
200
011001000
400
450
500
200
100
50
25
210
011010010
420
472.5
525
210
105
52.5
26.25
220
011011100
440
495
550
220
110
55
27.50
230
011100110
402.5
460
517.5
575
230
115
57.5
28.75
240
011110000
420
480
540
600
240
120
60
30
250
011111010
437.5
500
562.5
625
250
125
62.5
31.25
260
100000100
455
520
585
650
260
130
65
32.50
270
100001110
405
472.5
540
607.5
675
270
135
67.5
33.75
280
100011000
420
490
560
630
700
280
140
70
35
290
100100010
435
507.5
580
652.5
725
290
145
72.5
36.25
300
100101100
450
525
600
675
750
300
150
75
37.5
310
100110110
465
542.5
620
697.5
775
310
155
77.5
38.75
320
101000000
480
560
640
720
800
320
160
80
40
330
101001010
495
577.5
660
742.5
330
165
82.5
41.25
340
101010100
510
595
680
765
340
170
85
42.5
350
101011110
525
612.5
700
787.5
350
175
87.5
43.75
360
101101000
540
630
720
360
180
90
45
370
101110010
555
647.5
740
370
185
92.5
46.25
380
101111100
570
665
760
380
190
95
47.5
390
110000110
585
682.5
780
390
195
97.5
48.75
400
110010000
600
700
800
400
200
100
50
410
110011010
615
717.5
420
110100100
630
735
430
110101110
645
752.5
440
110111000
660
770
450
111000010
675
787.5
510
111111110
765
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