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LMX2531LQ1500E Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2531LQ1500E
Description  High Performance Frequency Synthesizer System with Integrated VCO
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2531LQ1500E Datasheet(HTML) 18 Page - National Semiconductor (TI)

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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
FLout Pin State
Timeout Count
0
High Impedance
0
1
Low
Always Enabled
2
Low
0
3
High
0
4
Low
4 X 2 Phase Detector
...
16383
Low
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
FLout
Charge Pump Current
R3
R4
Steady State
High Impedance
ICP
R3_ADJ
R4_ADJ
Fastlock
Grounded
ICPFL
R3_ADJ_FL
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
Fastlock Charge Pump State
Typical Fastlock Charge Pump Current at 3 Volts (µA)
01X
90
1
2X
180
2
3X
270
3
4X
360
4
5X
450
5
6X
540
6
7X
630
7
8X
720
8
9X
810
9
10X
900
10
11X
990
11
12X
1080
12
13X
1170
13
14X
1260
14
15X
1350
15
16X
1440
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