參數(shù)資料
型號： LMX2330LSBX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： PLLatinumTM Low Power Dual Frequency Synthesizer for RF Personal Communications
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24
封裝： CSP-24
文件頁數(shù)： 15/23頁
文件大?。?/td> 553K
代理商： LMX2330LSBX
Functional Description
(Continued)
PROGRAMMABLE MODES
Several modes of operation can be programmed with bits R16–R20 including the phase detector polarity, charge pump
TRI-STATE and the output of the F
o
LD pin. The prescaler and powerdown modes are selected with bits N19 and N20. The
programmable modes are shown in Table 1 Truth table for the programmable modes and F
o
LD output are shown in Table 2 and
Table 3
TABLE 1. Programmable Modes
C1
0
C2
0
R16
R17
IF I
CPo
R18
IF D
o
R19
IF LD
R20
IF F
o
IF Phase
Detector Polarity
RF Phase
Detector Polarity
TRI-STATE
RF D
o
TRI-STATE
0
1
RF I
CPo
RF LD
RF F
o
C1
1
1
C2
0
1
N19
N20
IF Prescaler
RF Prescaler
Pwdn IF
Pwdn RF
TABLE 2. Mode Select Truth Table
Phase Detector Polarity
(Note 11)
Negative
Positive
D
o
TRI-STATE
(Note 9)
Normal Operation
TRI-STATE
I
CPo
IF
2330L RF
Prescaler
32/33
64/65
2331L/32L RF
Prescaler
64/65
128/129
Pwdn
(Note 9)
Pwrd Up
Pwrd Dn
(Note 10)
LOW
HIGH
Prescaler
8/9
16/17
0
1
Note 9:
Refer to POWERDOWN OPERATION in Functional Description.
Note 10:
The I
CPo
LOW current state = 1/4 x I
CPo
HIGH current.
Note 11:
PHASE DETECTOR POLARITY
Depending upon VCO characteristics, R16 bit should be set accordingly: (see figure right)
When VCO characteristics are positive like (1), R16 should be set HIGH;
When VCO characteristics are negative like (2), R16 should be set LOW.
VCO Characteristics
01280609
L
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