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參數(shù)資料
| 型號： | LMX2330U |
| 文件頁數(shù)： | 8/19頁 |
| 文件大?。?/td> | 362K |
| 代理商： | LMX2330U |
1.0 Functional Description
(Continued)
1.2 PROGRAMMABLE DIVIDER (N COUNTER)
The N counter consists of the 5-bit swallow counter (A counter) and the 13-bit programmable counter (B counter). If the Control
Bits are [C
, C
] = [1,0], data is transferred from the 21-bit shift register into a 5-bit latch (which sets the Swallow (A) Counter),
a 13-bit latch (which sets the 13-bit programmable (B) Counter), and the GO bit (See Section 1.3.4 FastLock MODES section)
MSB first. For the LMX2306 the maximum N value is 65535 and the minimum N value is 56. For the LMX2316/26, the maximum
N value is 262143 and the minimum N value is 992. Serial data format is shown below.
1.2.1 5-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER)
LMX2316/26
Divide
Ratio
0
1
31
N
5
0
0
1
N
4
0
0
1
N
3
0
0
1
N
2
0
0
1
N
1
0
1
1
Note:
Divide ratio: 0 to 31
B
≥
A
LMX2306
Divide
Ratio
0
1
7
N
5
X
X
X
N
4
X
X
X
N
3
0
0
1
N
2
0
0
1
N
1
0
1
1
Note:
Divide ratio: 0 to 7
B
≥
A
X denotes a Don’t Care condition
1.2.2 13-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)
Divide
Ratio
3
4
8191
N
18
0
0
1
N
17
0
0
1
N
16
0
0
1
N
15
0
0
1
N
14
0
0
1
N
13
0
0
1
N
12
0
0
1
N
11
0
0
1
N
10
0
0
1
N
9
0
0
1
N
8
0
1
1
N
7
1
0
1
N
6
1
0
1
Divide ratio: 3 to 8191 (Divide ratios less than 3 are prohibited)
B
≥
A
1.2.3 PULSE SWALLOW FUNCTION
fvco = [(P x B) + A] x fosc/R
f
vco
:
Output frequency of external voltage controlled oscillator (VCO)
B:
Preset divide ratio of binary 13-bit programmable counter (3 to 8191)
A:
Preset divide ratio of binary 5-bit swallow counter (0
≤
A
≤
31; A
≤
B for LMX2316/26)
or (0
≤
A
≤
7, A
≤
B for LMX2306)
f
osc
:
Output frequency of the external reference frequency oscillator
R:
Preset divide ratio of binary 14-bit programmable reference counter (3 to 16383)
P:
Preset modulus of dual modulus prescaler
for the LMX2306; P = 8
for the LMX2316/26; P = 32
DS100127-6
Note:
Data is shifted in MSB first.
L
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