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參數(shù)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(shù): 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
相關PDF資料
PDF描述
LMX2305 PLLatinum 550 MHz Frequency Synthesizer for RF Personal Communications(PLLatinum技術用于射頻個人通訊的550MHZ頻率合成器)
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
LMX2354SLB PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
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