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參數(shù)資料
| 型號： | LMX2326TM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2800 MHz, PDSO16 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 18/19頁 |
| 文件大小： | 342K |
| 代理商： | LMX2326TM/NOPB |
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
1,C2] = [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.
10012706
Note: Data is shifted in MSB first.
1.2.1 5-bit Swallow Counter Divide Ratio (A Counter)
LMX2316/26
Divide
NNNN
N
Ratio
5432
1
0
0000
0
1
0000
1
31
1111
1
Note: Divide ratio: 0 to 31
B
≥ A
LMX2306
Divide
NNNN
N
Ratio
5432
1
0X
X
0
Divide
NNNN
N
Ratio
5432
1
1X
X
0
1
7X
X
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
NNNNNNNNN
N
Ratio
18
17
16
15
14
13
12
11
10
9
8
7
6
3
000000000
0
1
4
000000000
0
1
0
8191
111111111
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
LMX2306/LMX2316/LMX2326
www.national.com
8
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