LMX2433 datasheet(38/53 Pages) TI1

38 / 53 page

LMX2430, LMX2433, LMX2434

SNAS187D – FEBRUARY 2003 – REVISED JANUARY 2016

www.ti.com

9.6.5.2.1

IF_P - IF Synthesizer Prescaler Select (R4[22])

The LMX243x IF synthesizer uses a selectable dual modulus prescaler. An 8/9 or a 16/17 prescale ratio can be

selected.

Table 36. IF Prescaler Select Bit

FUNCTION

CONTROL BIT

DESCRIPTION

IF_P

R4[22]

IF Prescaler Select

8/9 Prescaler Selected

16/17 Prescaler Selected

9.6.5.3 IF_PD - IF Synthesizer Power Down (R4[23])

The IF_PD bit is used to switch the IF PLL between a powered-up and powered-down mode.

Furthermore, the IF_PD bit operates in conjuction with the IF_CPT bit to set a synchronous or an asynchronous

power-down mode. Refer to IF_CPT - IF Synthesizer Charge-Pump Tri-State (R3[20]) for more details on how to

program the IF_CPT bit.

Table 37. IF PLL Powerdown Bit

FUNCTION

CONTROL BIT

DESCRIPTION

IF_PD

R4[23]

IF Power down

IF PLL Active

IF PLL Power down

9.6.6 R5 Register

The R5 Register contains the IF_TOC control word. The IF_TOC is used to set up the fastlock circuitry of the IF

synthesizer. The IF_TOC is a 12-bit binary counter programmable from 0 to 4095.

Table 38. R5 Register

REG

ADDRESS

DATA[20:0] FIELD

[2:0]

FIELD

IF_TOC[11:0]

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