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LM2326SLBX 数据表(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM2326SLBX
功能描述  PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM2326SLBX 数据表(HTML) 8 Page - National Semiconductor (TI)

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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.
1.2.1 5-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER)
LMX2316/26
Divide
NNNNN
Ratio
54321
0
00000
1
00001
•••••
31
11111
Note: Divide ratio: 0 to 31
B
≥ A
LMX2306
Divide
NNNNN
Ratio
54321
0
X
X
000
1
X
X
001
•••••
7
X
X
111
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
NNNN
Ratio
18
17
16
15
14
13
12
11
10
9876
3
000000000
0011
4
000000000
0100
•••••••••
••••
8191
111111111
1111
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.
www.national.com
8


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