參數(shù)資料
型號(hào): LMX2531LQ1910E
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: PLLatinum High Performance Frequency Synthesizer System with Integrated VCO
中文描述: PLL FREQUENCY SYNTHESIZER, 80 MHz, QCC36
封裝: 6 X 6 MM, 0.80 MM HEIGHT, LEAD FREE, LLP-36
文件頁(yè)數(shù): 19/25頁(yè)
文件大?。?/td> 589K
代理商: LMX2531LQ1910E
2.0 General Programming Information
(Continued)
2.5 REGISTER R4
2.5.1 TOC[13:0] -- Time Out Counter for FastLock
When the value of this word is 3 or less, then FastLock is disabled, and this pin can only be used for general purpose I/O. When
this value is 4 or greater, the time out counter is engaged for the amount of phase detector cycles shown in the table below.
TOC Value
0
1
2
3
4
.
16383
FLout Pin State
High Impedance
Low
Low
High
Low
.
Low
Timeout Count
0
Always Enabled
0
0
4 X 2 Phase Detector
.
16383 X 2 Phase Detector
When this count is active, the FLout Pin is grounded, the FastLock current is engaged, and the resistors R3 and R4 are also
potentially changed. The table below summarizes the bits that control various values in and out of FastLock differences.
FastLock State
Steady State
Fastlock
FLoutRF
High Impedance
Grounded
Charge Pump Current
ICP
ICPFL
R3
R4
R3_ADJ
R3_ADJ_FL
R4_ADJ
R4_ADJ_FL
2.5.2 ICPFL[3:0] -- Charge Pump Current for Fastlock
When FastLock is enabled, this is the charge pump current that is used for faster lock time.
ICPFL
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Fastlock Charge Pump State
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
Typical Fastlock Charge Pump Current at 3 Volts (μA)
95
190
285
380
475
570
665
760
855
950
1045
1140
1235
1330
1425
1520
L
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