LMX2430 datasheet(39/49 Pages) NSC

39 / 49 page

2.0 Programming Description (Continued)

2.4 R0 REGISTER

The R0 register contains the RF_R, RF_CPP, RF_CPG, RF_CPT, and RF_RST control words, in addition to two of the four bits

that compose the MUX control word. The detailed descriptions and programming information for each control word is discussed

in the following sections.

Reg

9876543210

DATA[20:0] FIELD

ADDRESS

[2:0]

FIELD

MUX[3:2]

RF_

RST

RF_

CPT

RF_

CPG

RF_

CPP

RF_R[14:0]

2.4.1 RF_R[14:0] - RF Synthesizer Programmable Reference Divider (R Counter) (R0[17:3])

The RF reference divider (RF_R) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3 are

prohibited.

Divide Ratio

RF_R[14:0]

987654321

00000000000001

00000000000010

•

••••••••••••••

•

32767

11111111111111

2.4.2 RF_CPP - RF Synthesizer Phase Detector Polarity (R0[18])

The RF_CPP bit is used to control the RF synthesizer’s phase/ frequency detector polarity based on the VCO tuning

characteristics.

Control Bit

Description

Function

RF_CPP

R0[18]

RF Phase/

Frequency Detector

Polarity

RF VCO Negative

Tuning

Characteristics

RF VCO Positive

Tuning

Characteristics

RF VCO Characteristics

20053567

LMX2430 データシート(PDF) 39 Page - National Semiconductor (TI)

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