參數(shù)資料
型號(hào)： LMX2331LMDA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 2000 MHz, UUC
封裝： DIE
文件頁(yè)數(shù)： 5/30頁(yè)
文件大?。?/td> 578K
代理商： LMX2331LMDA
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
Bits are 10 or 11 (10 for IF counter and 11 for RF counter) data is transferred from the 22-bit shift register into a 4-bit or 7-bit latch
(which sets the Swallow (A) Counter) and an 11-bit latch (which sets the 11-bit programmable (B) Counter), MSB first. Serial data
format is shown below. For the IF N counter bits 5, 6, and 7 are don’t care bits. The RF N counter does not have don’t care
bits.
7-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER)
RF
Divide
N
7
N
6
N
5
N
4
N
3
N
2
N
1
Ratio
A
0
0000000
1
0000001
127
1111111
Notes: Divide ratio: 0 to 127
B
≥ A
IF
Divide
N
7
N
6
N
5
N
4
N
3
N
2
N
1
Ratio
A
0
X
0000
1
X
0001
15
X
1111
X = DON’T CARE condition
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)
Divide
N
18
N
17
N
16
N
15
N
14
N
13
N
12
N
11
N
10
N
9
N
8
Ratio
B
3
00000000011
4
00000000100
2047
11111111111
Note: Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited)
B
≥ A
PULSE SWALLOW FUNCTION
f
VCO = [(P xB)+ A]xfOSC/R
f
VCO:
Output frequency of external voltage controlled oscillator (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
≤ A ≤ 127 {RF}, 0 ≤ A ≤ 15 {IF}, A ≤ B)
f
OSC:
Output frequency of the external reference frequency oscillator
R:
Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767)
P:
Preset modulus of dual moduIus prescaler (for IF;P = 8or16;
for RF; LMX2330L: P = 32 or 64
LMX2331L/32L: P = 64 or 128)
DS012806-8
www.national.com
13
相關(guān)PDF資料
PDF描述
LMX2332UTMX/NOPB PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
LMX2332UTM/NOPB PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
LMX2331UTM/NOPB PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20
LMX2331USLEX PLL FREQUENCY SYNTHESIZER, 2000 MHz, PQCC24
LMX2330UTMX/NOPB PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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