ICS843020-01 Datasheet, PDF (5/20 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM 680MHZ, CRYSTAL-TO- 3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843020-01
FEMTOCLOCKS™ 680MHZ, CRYSTAL-TO-
3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
TABLE 3D. PROGRAMMABLE VCO FREQUENCY FUNCTION TABLE WITH P = ÷8 (P_DIV = 0)
VCO Frequency
(MHz)
M Divide
256
M8
128
M7
64
M6
32
M5
16
M4
8
M3
4
M2
2
M1
1
M0
575
184
0
1
0
1
1
1
0
0
0
•
•
•
•
•
•
•
•
•
•
•
600
192
0
1
1
0
0
0
0
0
0
•
•
•
•
•
•
•
•
•
•
•
675
216
0
1
1
0
0
1
1
1
0
NOTE 1: These M divide values and the resulting frequencies correspond to crystal or TEST_CLK input frequency
of 25MHz.
TABLE 3E. PROGRAMMABLE OUTPUT DIVIDER FUNCTION TABLE
Inputs
N1
N0
0
0
0
1
1
0
1
1
N Divider Value
1
2
4
8
Output Frequency (MHz)
Minimum Maximum
560
680
280
340
140
170
70
85
843020AY-01
www.icst.com/products/hiperclocks.html
5
REV. B APRIL 14, 2005