LMX2430 datasheet(3/49 Pages) NSC

3 / 49 page

Connection Diagrams

Ultra Thin Chip Scale Package (SLE)

(Top View)

Thin Shrink Small Outline Package (TM)

(Top View)

20053539

20053583

Pin Descriptions

Pin No.

UTCSP

Pin No.

TSSOP

Pin Name

I/O

Description

GND

—

Ground for the IF PLL analog and digital circuits, MICROWIRE

TM, Ftest/LD and

oscillator circuits.

FinIF

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

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

the RF and IF PLLs are powered up. Powerdown 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).

CPoutIF

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

which drives the input of the IF VCO.

ENosc

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. 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.

OSCout/

FLoutIF

Oscillator output/ IF PLL Fastlock output. The output configuration is dependent

on the state of the ENosc pin. When ENosc is set LOW, the pin functions as an

IF Fastlock output, which connects a resistor in parallel to R2 of the external

loop filter. This configuration also functions as a general purpose CMOS

TRI-STATE output. When ENosc is set HIGH, the pin functions as an oscillator

output so that an external crystal can be used.

OSCin

Reference oscillator input. The input has an approximate Vcc/2 threshold and is

driven by an external AC coupled source.

Vcc

—

Power supply bias for the RF PLL digital circuits and oscillator circuits. Vcc may

range from 2.25V to 2.75V. Bypass capacitors should be placed as close as

possible to this pin and be connected directly to the ground plane.

Ftest/LD

Programmable multiplexed output. Functions as a general purpose CMOS

TRI-STATE output, N and R divider output, RF/ IF PLL push-pull analog lock

detect output, RF/ IF PLL open-drain analog lock detect output, or RF/ IF PLL

digital filtered lock detect output.

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