LMX2485_14 datasheet(2/43 Pages) TI1

Part #	LMX2485

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	TI1 [Texas Instruments]

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FinIF

24

14

15

13

16

17

18

19

20

23

21

22

7

12

11

8

10

9

5

4

6

3

2

1

Pin 0

(Ground Substrate)

VddIF1

GND

CPoutIF

VddIF2

OSCout

LE

FinRF*

FinRF

VddRF1

GND

CPoutRF

VddRF5

Phase

Comp

FinIF

Charge

Pump

CPoutIF

Ftest/LD

MUX

Ftest/LD

IF

LD

Phase

Comp

8/9

or

16/17

Prescaler

B Counter

IF N Divider

A Counter

FLoutRF

VddIF2

VddIF1

RF N Divider

GND

FinRF

FinRF*

8/9/12/13

or

16/17/20/21

Prescaler

C Counter

6'

Compensation

A Counter

B Counter

RF N Divider

ENOSC

OSCout

OSCin

VddRF4

VddRF3

VddRF2

VddRF1

IF R

Divider

RF R

Divider

1X / 2X

RF LD

Charge

Pump

CPoutRF

RF Fastlock

MICROWIRE

Interface

CLK

LE

DATA

CE

LMX2485, LMX2485E

SNAS236E – OCTOBER 2005 – REVISED FEBRUARY 2008

www.ti.com

FUNCTIONAL BLOCK DIAGRAM

CONNECTION DIAGRAM

Figure 1. Top View

24-Pin LLP (SQ)

PIN FUNCTIONS

Pin Descriptions

Pin #

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.

2

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LMX2485 Datasheet(PDF) 2 Page - Texas Instruments

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