LMX1501AM datasheet(12/22 Pages) NSC

Nome de Peças	LMX1501AM

Descrição Electrónicos	PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications

PDF	22 Pages

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Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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12 / 22 page

Functional Description (Continued)

SERIAL DATA INPUT TIMING

TLW12340 – 22

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 VCC 2 The test waveform has an edge rate of 06 Vns with

amplitudes of 22V

VCC e 27V and 26V

VCC e 55V

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 fout is set to the reference

divider output fr When FC is set LOW fout is set to the

programmable divider output fp

VCO Characteristics

TLW12340 – 23

PHASE COMPARATOR AND INTERNAL CHARGE PUMP CHARACTERISTICS

TLW12340 – 24

Notes

Phase difference detection range b2q to a2q

The minimum width pump up and pump down current pulses occur at the Do pin when the loop is locked

FC e HIGH

LMX1501AM Folha de dados(PDF) 12 Page - National Semiconductor (TI)