LMX2433 datasheet(3/53 Pages) TI1

3 / 53 page

LMX2430, LMX2433, LMX2434

www.ti.com

SNAS187D – FEBRUARY 2003 – REVISED JANUARY 2016

5 Description continued

The LMX243x devices are high-performance frequency synthesizers with integrated dual-modulus prescalers. A

32/33 or a 16/17 prescale ratio can be selected for the 5-GHz LMX2434 RF synthesizer. An 8/9 or a 16/17

prescale ratio can be selected for both the LMX2430 and LMX2433 RF synthesizers. The IF circuitry contains an

8/9 or a 16/17 prescaler.

Serial data is transferred to the devices through a three-wire interface (DATA, LE, CLK). A low voltage logic

interface allows direct connection to 1.8-V devices. Supply voltages from 2.25 V to 2.75 V are supported.

6 Pin Configuration and Functions

NPE Package

PW Package

20-Pin ULGA Ultra Thin Chip Scale

20-Pin TSSOP Thin Shrink Small Outline

Top View

Pin Functions

I/O

DESCRIPTION

NAME

ULGA

TSSOP

MICROWIRE Clock input. High-impedance CMOS input. DATA is clocked into the

CLK

24-bit shift register on the rising edge of CLK.

IF PLL charge-pump output. The output is connected to the external loop filter,

CPoutIF

which drives the input of the IF VCO.

RF PLL charge-pump output. The output is connected to the external loop filter,

CPoutRF

which drives the input of the RF VCO.

MICROWIRE Data input. High-impedance CMOS input. Binary serial data. The MSB

DATA

of DATA is shifted in first. The two last bits are the control bits.

Chip Enable input. High-Impedance CMOS input. When this pin is set HIGH, the RF

and IF PLLs are powered up. Power down is then controlled through the

MICROWIRE. When this pin is set LOW, the device is asynchronously powered

down, and the charge-pump output is forced to a high-impedance state (tri-state).

Oscillator Enable input. High-impedance CMOS input. When this pin is set HIGH,

the oscillator buffer is always powered up, independent of the state of the EN pin.

ENosc

When this pin is set LOW, the OSCout/ FLoutIF pin functions as an IF fastlock

output, which connects a resistor in parallel to R2 of the external loop filter.

FinIF

IF PLL prescaler input. Small signal input from the VCO.

RF PLL fastlock output. This pin connects a resistor in parallel to R2 of the external

FLoutRF

loop filter. This pin can also function as a general-purpose CMOS tri-state output.

FinRF

RF PLL prescaler input. Small-signal input from the VCO.

RF PLL prescaler complementary input. For single-ended operation, this pin must be

FinRF*

AC grounded through a 100-pF capacitor. The LMX243x can be driven differentially

when the AC-coupled capacitor is omitted.

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Product Folder Links: LMX2430 LMX2433 LMX2434

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