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參數(shù)資料
| 型號： | LMX2337TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 550 MHz, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 393K |
| 代理商： | LMX2337TM |
Functional Description
(Continued)
TABLE 1. Programmable Modes
C1
0
C2
0
R16
R17
R18
RF2 D
o
TRI-STATE
RF1 D
o
TRI-STATE
R19
RF2 LD
R20
RF2 F
o
RF2 Phase
Detector Polarity
RF1 Phase
Detector Polarity
RF2 I
CP
o
0
1
RF1 I
CP
O
RF1 LD
RF1 F
o
C1
C2
N19
RF2
N20
Pwdn
RF2
Pwdn
RF1
1
0
Prescaler
RF1
Prescaler
1
1
TABLE 2. Mode Select Truth Table
Phase Detector Polarity
(Note 7)
Negative
Positive
D
o
TRI-STATE
I
CP
(Note 5)
LOW
HIGH
RF1
Prescaler
64/65
128/129
RF2
Prescaler
64/65
128/129
Pwdn
(Note 6)
pwrd up
pwrd dn
0
1
Normal Operation
TRI-STATE
Note 5:
The I
CPo
LOW current state = 1/4 x I
CPo
HIGH current.
Note 6:
Activation of the RF2 PLL or RF1 PLL powerdown modes result in the disabling of the respective N counter divider and debiasing of its respective f
inputs
(to a high impedance state). The powerdown function is gated by the charge pump to prevent unwanted frequency jumps. Once the powerdown program mode is
loaded, the part will go into powerdown mode when the charge pump reaches a TRI-STATE condition. The R counter and Oscillator functionality does not become
disabled until both RF2 and RF1 powerdown bits are activated. The OSC
is connected to V
through 100 k
resistor and the OSC
goes HIGH when this con-
dition exists. The MICROWIRE control register remains active and capable of loading and latching data during all of the powerdown modes.
Note 7:
PHASE DETECTOR POLARITY
Depending upon VCO characteristics, the R16 bits should be set accordingly:
When VCO characteristics are positive like (1), R16 should be set HIGH;
When VCO characteristics are negative like (2), R16 should be set LOW.
Note 8:
TABLE 3. The F
o
LD Output Truth Table
RF1 R[19]
(RF1 LD)
0
0
1
1
X
X
X
X
0
0
1
1
RF2 R[19]
(RF2 LD)
0
1
0
1
0
0
1
1
0
1
0
1
RF1 R[20]
(RF1 F
o
)
0
0
0
0
0
1
0
1
1
1
1
1
RF2 R[20]
(RF2 F
o
)
0
0
0
0
1
0
1
0
1
1
1
1
F
o
LD
Output State
Disabled (Note 9)
RF2 Lock Detect (Note 10)
RF1 Lock Detect (Note 10)
RF1/RF2 Lock Detect (Note 10)
RF2 Reference Divider Output
RF1 Reference Divider Output
RF2 Programmable Divider Output
RF1 Programmable Divider Output
Fastlock (Note 11)
For Internal use only
For Internal use only
Counter Reset (Note 12)
X — don’t care condition
VCO Characteristics
DS012332-7
www.national.com
10
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參數(shù)描述 |
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| LMX2337TMX | 功能描述:IC FREQ SYNTH DL 1.1GHZ 16-TSSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX233XA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2346 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications |
| LMX2346SLBX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications |
| LMX2346SLBX/NOPB | 功能描述:IC FREQ SYNTH 2.0GHZ 16LAMCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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