LMX2485SQ datasheet(2/37 Pages) NSC

Part #	LMX2485SQ

Description	50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum??Frequency Synthesizers with 800 MHz Integer PLL

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Connection Diagram

Top View

24-Pin LLP (SQ)

20087722

Pin Descriptions

Pin #

Name

I/O

Pin Description

0

GND

-

Ground Substrate. This is on the bottom of the package and must be grounded.

1

CPoutRF

O

RF PLL charge pump output.

2

GND

-

RF PLL analog ground.

3

VddRF1

-

RF PLL analog power supply.

4

FinRF

I

RF PLL high frequency input pin.

5

FinRF*

I

RF PLL complementary high frequency input pin. Shunt to ground with a 100 pF

capacitor.

6

LE

I

MICROWIRE Load Enable. High impedance CMOS input. Data stored in the shift

registers is loaded into the internal latches when LE goes HIGH

7

DATA

I

MICROWIRE Data. High impedance binary serial data input.

8

CLK

I

MICROWIRE Clock. High impedance CMOS Clock input. Data for the various counters is

clocked into the 24 bit shift register on the rising edge

9

VddRF2

-

Power supply for RF PLL digital circuitry.

10

CE

I

Chip Enable control pin. Must be pulled high for normal operation.

11

VddRF5

I

Power supply for RF PLL circuitry.

12

Ftest/LD

O

Test frequency output / Lock Detect.

13

FinIF

I

IF PLL high frequency input pin.

14

VddIF1

-

IF PLL analog power supply.

15

GND

-

IF PLL digital ground.

16

CPoutIF

O

IF PLL charge pump output

17

VddIF2

-

IF PLL power supply.

18

OSCout

O

Buffered output of the OSCin signal.

19

ENOSC

I

Oscillator enable. When this is set to high, the OSCout pin is enabled regardless of the

state of other pins or register bits.

20

OSCin

I

Input for TCXO signal.

21

NC

I

This pin must be left open.

22

VddRF3

-

Power supply for RF PLL digital circuitry.

23

FLoutRF

O

RF PLL Fastlock Output. Also functions as Programmable TRI-STATE CMOS output.

24

VddRF4

-

RF PLL analog power supply.

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