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參數資料
| 型號： | LMX2305TMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinumTM 550 MHz Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 550 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數： | 7/14頁 |
| 文件大小： | 228K |
| 代理商： | LMX2305TMX |
Functional Description
(Continued)
PROGRAMMABLE DIVIDER (N COUNTER)
The N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter). If the Control
Bit (last bit shifted into the Data Register) is LOW, data is transferred from the 19-bit shift register into a 7-bit latch, which sets
the 7-bit Swallow (A) Counter, and an 11-bit latch, which sets the 11-bit programmable (B) Counter. Serial data format is shown
below.
TL/W/12459–15
Note:
S8 to S18: Programmable counter divide ratio control bits (3 to 2047)
7-BIT SWALLOW COUNTER DIVIDE RATIO
(A COUNTER)
Divide
Ratio
A
N
7
N
6
N
5
N
4
N
3
N
2
N
1
0
0
0
0
0
0
0
0
1
#
0
#
0
#
0
#
0
#
0
#
0
#
1
#
127
1
1
1
1
1
1
1
Note:
Divide ratio: 0 to 127
B
t
A
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
(B COUNTER)
Divide
Ratio
B
18
N
17
N
16
N
15
N
14
N
13
N
12
N
11
N
10
N
N
9
N
8
3
0
0
0
0
0
0
0
0
0
1
1
4
#
0
#
0
#
0
#
0
#
0
#
0
#
0
#
0
#
1
#
0
#
0
#
2047
1
1
1
1
1
1
1
1
1
1
1
Note:
Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited)
B
t
A
PULSE SWALLOW FUNCTION
f
VCO
e
[
(P
c
B)
a
A
]
c
f
OSC
/R
f
VCO
: Output frequency of external voltage controlled oscil-
lator (VCO)
B:
Preset divide ratio of binary 11-bit programmable
counter (3 to 2047)
A:
Preset divide ratio of binary 7-bit swallow counter
(0
s
A
s
127, A
s
B)
f
OSC
: Output frequency of the external reference frequency
oscillator
R:
Preset divide ratio of binary 14-bit programmable ref-
erence counter (3 to 16383)
P:
Preset modulus of dual modulus prescaler (64 or 128)
http://www.national.com
7
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| LMX2354TM | PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2354 | PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2355TM | PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2305WG/B | 制造商:Rochester Electronics LLC 功能描述: |
| LMX2306 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Frequency Synthesizer for RF Personal Communications |
| LMX2306_04 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Frequency Synthesizer for RF Personal Communications |
| LMX2306LBX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FREQUENCY SYNTHESIZER|BICMOS|LLCC|16PIN|PLASTIC |
| LMX2306SLBX | 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Single 25MHz to 550MHz 16-Pin LAM CSP T/R |
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