LMX2433 datasheet(32/53 Pages) TI1

32 / 53 page

LMX2430, LMX2433, LMX2434

SNAS187D – FEBRUARY 2003 – REVISED JANUARY 2016

www.ti.com

9.6.2.3 RF_CPG - RF Synthesizer Charge-Pump Current Gain (R0[19])

The RF_CPG bit controls the charge-pump gain of the RF synthesizer. Two gain levels are available.

Table 14. Charge-Pump Polarity

FUNCTION

CONTROL BIT

DESCRIPTION

RF Charge-Pump Current

LOW

HIGH

RF_CPG

R0[19]

Gain

1 mA

4 mA

9.6.2.4 RF_CPT - RF Synthesizer Charge-Pump Tri-State (R0[20])

The RF_CPT bit allows the charge pump to be switched between a normal operating mode and a high-

impedance output state. This happens asynchronously with the change in the RF_CPT bit.

Furthermore, the RF_CPT bit operates in conjuction with the RF_PD bit to set a synchronous or an

asynchronous power-down mode. Refer to RF_PD - RF Synthesizer Power Down (R1[23]) for more details on

how to program the RF_PD bit.

Table 15. Charge-Pump Tri-State

FUNCTION

CONTROL BIT

DESCRIPTION

RF_CPT

R0[20]

RF Charge-Pump tri-state

RF Charge Pump Normal

RF Charge-Pump Output

Operation

in High Impedance State

9.6.2.5 RF_RST - RF Synthesizer Counter Reset (R0[21])

The RF_RST bit resets the RF_A, RF_B and RF_R counters. After removing the reset, the RF_A and RF_B

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

Table 16. N Counter Reset

FUNCTION

CONTROL BIT

DESCRIPTION

RF_RST

R0[21]

RF Counter Reset

RF_A, RF_B and RF_R

Normal Operation

Reset

9.6.3 R1 Register

The R1 register contains the RF_A, RF_B, RF_P, and RF_PD control words. The RF_A and RF_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.

Table 17. RI Register

ADDRESS

REG

DATA[20:0] FIELD

[2:0]

FIELD

LMX2430/33

RF_B[14:0]

RF_A[3:0]

LMX2434

RF_B[13:0]

RF_A[4:0]

Submit Documentation Feedback

Product Folder Links: LMX2430 LMX2433 LMX2434

LMX2433 Datasheet(PDF) 32 Page - Texas Instruments

LMX2433 Datasheet(HTML) 32 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

Datasheet Download

Link URL