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參數(shù)資料
| 型號： | WB1220X |
| 英文描述： | Serial-Input Frequency Synthesizer |
| 中文描述： | 串行輸入頻率合成器 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大小： | 174K |
| 代理商： | WB1220X |
WB1220
8
Document #: 38-00864-A
Table 3. 7-Bit Swallow Counter (A) Truth Table[8]
Divide Ratio A
A7A6A5A4A3A2A1
0
0000
1
0000
001
:::
126
1111
110
127
1111
111
Table 4. 11-Bit Programmable Counter (B) Truth Table[9]
Divide Ratio B
B11
B10
B9B8B7B6B5B4B3B2B1
3
0000000
0011
4
0000000
0100
:::
2046
1
1111
1110
2047
1
1111
Table 5. 14-Bit Programmable Reference Counter Truth Table[9]
Divide Ratio R
R14
R13
R12
R11
R10
R9
R8
R7
R6
R5
R4
R3
R2
R1
3
0
000
00
011
4
0
000
00
100
:::
16382
1
0
16383
1
Ordering Information[10]
Ordering Code
Package
Name
Package Type
TR
WB1220
X
20-pin TSSOP (0.173” wide)
Tape and Reel Option
Notes:
8.
B is greater than or equal to A.
9.
Divide ratio less than 3 is prohibited. The divide ratio can be calculated using the following equation:
10. Operating temperature range: –40°C to +85°C.
fvco = {(P * B) + A} * fosc / R where (A < B)
fvco: Output frequency of the external VCO.
The divide ratio N = (P * B) + A.
R: Preset ratio of the 15-bit programmable reference counter (3 to 16383).
fosc: The crystal reference oscillator frequency.
A: Preset divide ratio of the 7-bit swallow counter.
B: Preset ratio of the 11-bit programmable counter (3 to 2047).
P: Preset divide ratio of the dual modulus prescaler.
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