SM5166 View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
Manufacturer
SM5166 Datasheet PDF : 11 Pages
| |||
SM5166AV
MSB
LSB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Input
Data
210 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 2 4 2 3 2 2 2 1 2 0
00100111010001000
Main counter
Swallow counter
(11-bit : 32 to 2047)
(5-bit : 0 to 31)
Latch selection bit : Set to "0"
Figure 3. Swallow counter and main counter frequency divider data example
Reference counter frequency divider setting
MSB
LSB
DATA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
212 211 210 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
(Reference counter 13-bit : 5 to 8191)
LD output setting bit∗
Test bits : (15, 16) = (0, 0) for normal operation
Latch selection bit : Set to "1"
∗ : Normal operation when 1,
LOW-level output when 0.
Figure 4. Reference counter data and LD output setting format
Input data example
If the VCO output (fVCO) is trebled, the crystal
frequency is 12.8 MHz and the channel bandwidth
(fCH: comparator frequency (fR) × 3) is 25 kHz, then
the reference frequency divider ratio R is given by:
NR
=
X-----t--a---l
fCH
=
-f--XR----t-×-a---l-3-
=
0---.--01---22---5.--8--⁄---3-
=
1536
=
8 × 192
Therefore, the reference counter count is 192
(00011000000)2. The input data format is shown in
figure 5.
NIPPON PRECISION CIRCUITS—7
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