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參數資料
| 型號： | LMX2305 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 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) |
| 中文描述： | PLLatinum 550兆赫頻率合成射頻個人通信（PLLatinum技術用于射頻個人通訊的550MHz的頻率合成器） |
| 文件頁數： | 8/14頁 |
| 文件大小： | 228K |
| 代理商： | LMX2305 |
Functional Description
(Continued)
SERIAL DATA INPUT TIMING
TL/W/12459–16
Notes:
Parenthesis data indicates programmable reference divider data.
Data shifted into register on clock rising edge.
Data is shifted in MSB first.
Test Conditions:
The Serial Data Input Timing is tested using a symmetrical waveform around V
CC
/2. The test waveform has an edge rate of 0.6 V/ns with
amplitudes of 2.2V
@
V
CC
e
2.7V and 2.6V
@
V
CC
e
5.5V.
Phase Characteristics
In normal operation, the FC pin is used to reverse the polari-
ty of the phase detector. Both the internal and any external
charge pump are affected.
Depending upon VCO characteristics, FC pin should be set
accordingly:
When VCO characteristics are like (1), FC should be set
HIGH or OPEN CIRCUIT;
When VCO characteristics are like (2), FC should be set
LOW.
When FC is set HIGH or OPEN CIRCUIT, the monitor pin of
the phase comparator input, f
out
, is set to the reference
divider output, f
r
. When FC is set LOW, f
out
is set to the
programmable divider output, f
p
.
VCO Characteristics
TL/W/12459–17
PHASE COMPARATOR AND INTERNAL CHARGE PUMP CHARACTERISTICS
TL/W/12459–18
Notes:
Phase difference detection range:
b
2
q
to
a
2
q
The minimum width pump up and pump down current pulses occur at the D
o
pin when the loop is locked.
FC
e
HIGH
http://www.national.com
8
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2305 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2305C WAF | 制造商:Texas Instruments 功能描述: |
| LMX2305TM | 制造商:Rochester Electronics LLC 功能描述: |
| LMX2305TMX | 功能描述:IC FREQ SYNTH DUAL 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數: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:* 供應商設備封裝:* 包裝:* |
| LMX2305WG/B | 制造商:Rochester Electronics LLC 功能描述: |
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