LMX2433 datasheet(37/53 Pages) TI1

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LMX2430, LMX2433, LMX2434

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SNAS187D – FEBRUARY 2003 – REVISED JANUARY 2016

9.6.4.2.5

IF_RST - IF Synthesizer Counter Reset (R3[21])

The IF_RST bit resets of the IF_A, IF_B and IF_R counters. After removing the reset, the IF_A and IF_B

counters resume counting in close alignment with the IF_R counter. The maximum error is one prescaler cycle.

Table 32. IF PLL Counter Reset

FUNCTION

CONTROL BIT

DESCRIPTION

IF_RST

R3[21]

IF Counter Reset

IF_A, IF_B and IF_R

Normal Operation

Reset

9.6.5 R4 Register

The R4 register contains the IF_A, IF_B, IF_P, and IF_PD control words. The IF_A and IF_B control words are

used to set up the programmable feedback divider. The detailed descriptions and programming information for

each control word is discussed in the following sections. R4[21] is always set to 0.

Table 33. R4 Register

REG

ADDRESS

DATA[20:0] FIELD

[2:0]

FIELD

IF_

IF_B[13:0]

IF_A[3:0]

9.6.5.1 IF_A[3:0] - IF Synthesizer Swallow Counter (A Counter) (R4[6:3])

The IF_A control word is used to set up the A counter of the IF synthesizer. The A counter is a 4-bit swallow

counter used in the programmable feedback divider. The IF_A control word can be programmed to values

ranging from 0 to 15.

Table 34. IF A counter Bit

IF_A[3:0]

DIVIDE RATIO

•

9.6.5.2 IF_B[13:0] - IF Synthesizer Programmable Binary Counter (B Counter) (R4[20:7])

The IF_B control word is used to set up the B counter of the IF synthesizer. The B counter is a 14-bit

programmable binary counter used in the programmable feedback divider. The IF_B control word can be

programmed to values ranging from 3 to 16,383. Divide ratios less than 3 are prohibited.

Table 35. IF B Counter

IF_B[13:0]

DIVIDE

RATIO

•

16383

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