參數(shù)資料
型號(hào)： LMX2332LTM/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
封裝： 0.173 INCH, TSSOP-20
文件頁(yè)數(shù)： 7/26頁(yè)
文件大小： 631K
代理商： LMX2332LTM/NOPB
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
oLD 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
oLD output are shown in Table 2 and
TABLE 1. Programmable Modes
C1
C2
R16
R17
R18
R19
R20
0
IF Phase
IF I
CPo
IF D
o
IF LD
IF F
o
Detector Polarity
TRI-STATE
0
1
RF Phase
RF I
CPo
RF D
o
RF LD
RF F
o
Detector Polarity
TRI-STATE
C1
C2
N19
N20
1
0
IF Prescaler
Pwdn IF
1
RF Prescaler
Pwdn RF
TABLE 2. Mode Select Truth Table
Phase Detector Polarity
D
o TRI-STATE
I
CPo
IF
2330L RF
2331L/32L RF
Pwdn
Prescaler
0
Negative
Normal Operation
LOW
8/9
32/33
64/65
Pwrd Up
1
Positive
TRI-STATE
HIGH
16/17
64/65
128/129
Pwrd Dn
Note 9: Refer to POWERDOWN OPERATION in Functional Description.
Note 10: The ICPo LOW current state = 1/4 x ICPo 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
LMX2330L/LMX2331L/LMX2332L
www.national.com
15
相關(guān)PDF資料
PDF描述
LMX2331LTM/NOPB PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20
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LMX2332UTMX/NOPB PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
LMX2332UTM/NOPB PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
LMX2331UTM/NOPB PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20
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