M1026-13-175.0000
| Model | M1026-13-175.0000 |
| Description | PLL/Frequency Synthesis Circuit |
| PDF file | Total 14 pages (File size: 480K) |
| Chip Manufacturer | IDT |
M1025/26
VCSO B
ASED
C
LOCK
PLL
WITH
A
UTO
S
WITCH
Preliminary Information
D
ETAILED
B
LOCK
D
IAGRAM
M1025/26
M UX
Detector
nDIF_REF1
Auto
Ref Sel
0
R Div
1
LOL
Phase
Detector
M / R Divider
LUT
M R_SEL3:0
4
Figure 3: Detailed Block Diagram
D
IVIDER
S
ELECTION
T
ABLES
M and R Divider Look-Up Tables (LUT)
The
MR_SEL3:0
pins select the feedback and reference
divider values M and R to enable adjustment of loop
bandwidth and jitter tolerance. The look-up tables vary
by device variant. M1025 and M1026 are defined in
Tables 3 and 4 respectively.
M1025 M/R Divider LUT
Phase Det.
Total
Fin for
Freq. for
MR_SEL3:0
M Div R Div PLL
155.52MHz
155.52MHz
Ratio VCSO (MHz)
VCSO (MHz)
Tables 3 and 4
provide example Fin and phase
detector frequencies with
155.52MHz
VCSO
devices (M1025-11-155.5200 and
M1026-11-155.5200).
See “Ordering Information” on pg. 14.
M1026 M/R Divider LUT
Phase Det.
Total
Fin for
Freq. for
MR_SEL3:0
M Div R Div PLL
155.52MHz
155.52MHz
Ratio VCSO (MHz)
VCSO (MHz)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
8
32
128
512
2
8
32
128
1
4
16
64
1
4
16
1
4
16
64
1
4
16
64
1
4
16
64
4
16
64
8
8
8
8
2
2
2
2
1
1
1
1
N/A
0.25
0.25
0.25
19.44
19.44
19.44
19.44
77.76
77.76
77.76
77.76
155.52
155.52
155.52
155.52
N/A
622.08
622.08
622.08
19.44
4.86
1.215
0.30375
77.76
19.44
4.86
1.215
155.52
38.88
9.72
2.43
N/A
155.52
38.88
9.72
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
4
16
64
256
2
8
32
128
1
4
16
64
1
4
16
1
4
16
64
1
4
16
64
1
4
16
64
4
16
64
4
4
4
4
2
2
2
2
1
1
1
1
N/A
0.25
0.25
0.25
38.88
38.88
38.88
38.88
77.76
77.76
77.76
77.76
155.52
155.52
155.52
155.52
N/A
622.08
622.08
622.08
38.88
9.72
2.43
0.6075
77.76
19.44
4.86
1.215
155.52
38.88
9.72
2.43
N/A
155.52
38.88
9.72
Test Mode
1
Test Mode
1
Table 3: M1025 M/R Divider LUT
Table 4: M1026 M/R Divider LUT
Note 1: Factory test mode; do not use.
Note 1: Factory test mode; do not use.
M1025/26 Datasheet Rev 0.1
●
3 of 14
●
Revised 11Nov2003
●
tel (508) 852-5400
