MPC9230EI 查看數據表（PDF） - Integrated Device Technology
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MPC9230EI Datasheet PDF : 16 Pages
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MPC9230 Data Sheet
800MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER
PROGRAMMING INTERFACE
Programming the MPC9230
Programming the MPC9230 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) ⋅ (4 ⋅ M) ÷ (2 ⋅ N) or
(1)
FOUT = (fXTAL ÷ 8) ⋅ M ÷ N
(2)
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 800 to 1600 MHz in order to achieve stable PLL operation:
MMIN = 4⋅fVCO,MIN ÷ fXTAL and
(3)
MMAX = 4⋅fVCO,MAX ÷ fXTAL
(4)
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 10 shows the usable VCO frequency and M divider range
for other example input frequencies. Assuming that a 16 MHz input
frequency is used, equation (2) reduces to:
FOUT = 2 ⋅ M ÷ N
(5)
Table 10. MPC9230 Frequency Operating Range
VCO frequency for an crystal interface frequency of [MHz]
M
M[8:0]
10
12
14
16
18
20
160
010100000
800
170
010101010
850
180
010110100
810
900
190
010111110
855
950
200
011001000
800
900
1000
210
011010010
840
945
1050
220
011011100
880
990
1100
230
011100110
805
920
1035
1150
240
011110000
840
960
1080
1200
250
011111010
875
100
1125
1250
260
100000100
910
1040
1170
1300
270
100001110
810
945
1080
1215
1350
280
100011000
840
980
1120
1260
1400
290
100100010
870
1015
1160
1305
1450
300
100101100
900
1050
310
100110110
930
1085
320
101000000
800
960
1120
1200
1240
1280
1350
1395
1440
1500
1550(1)
1600(1)
330
101001010
825
990
1155
340
101010100
850
1020
1190
350
101011110
875
1050
1225
1320
1360
1400
1485
1530(1)
1575(1)
360
101101000
900
1080
1260
1440
370
101110010
925
1110
1295
1480
380
101111100
950
1140
1330
1520(1)
390
110000110
975
1170
1365
1560(1)
400
110010000
1000
1200
1400
1600(1)
410
110011010
1025
1230
1435
420
110100100
1050
1260
1470
430
110101110
1075
1290 1505(1)
440
110111000
1100
1320 1540(1)
450
111000010
1125
1350 1575(1)
Output frequency for fXTAL=16 MHz and for N =
1
2
4
8
400
420
440
460
480
500
520
540
560
580
600
620
640
660
680
700
720
740
760(2)
780(2)
800(2)
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380(2)
390(2)
400(2)
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190(2)
195(2)
200(2)
50
52.5
55
57.5
60
62.5
65
67.5
70
72.5
75
77.5
80
82.5
85
87.5
90
92.5
95(2)
97.5(2)
100(2)
1. This VCO frequency is only available at the 0°C to +70°C temperature range.
2. This output frequency is only available at the 0°C to +70°C temperature range.
MPC9230 REVISION 8 MARCH 29, 2010
8
©2010 Integrated Device Technology, Inc.
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