LMX2470

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SNAS195A – MAY 2004 – REVISED MAY 2004

Pin Descriptions (continued)

Pin #

Pin Name

I/O

Pin Description

7

VccRF

RF PLL power supply voltage input. Must be equal to VccIF . 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.

8

EN

I

Chip enable input. High impedance CMOS input. When EN is high, the chip is powered up, otherwise

it is powered down.

9

ENOSC

I

This pin should be grounded for normal operation.

10

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.

11

DATA

I

MICROWIRE Data. High impedance binary serial data input.

12

LE

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

into the internal latches when LE goes HIGH

13

Ftest/LD

O

Test frequency output / Lock Detect

14

VddIF

-

Digital power supply for IF PLL

15

VccIF

-

IF power supply voltage input. Must be equal to VccRF. Input may range from 2.25 V to 2.75 V.

Bypass capacitors should be placed as close as possible to this pin and be connected directly to the

ground plane.

16

GND

-

Ground for RF PLL digital circuitry.

17

FinIF

I

IF prescaler input. Small signal input from the VCO.

18

GND

-

Digital ground for IF PLL

19

CPoutIF

O

IF PLL charge pump output

20

FLoutIF

O

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

21

OSCout*

I/O

Complementary reference input or oscillator output.

22

OSCin

I

Reference input

23

VddRF

-

Digital power supply for RF PLL

24

FLoutRF

O

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

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1) (2)

Value

Parameter

Symbol

Units

Min

Typ

Max

Power Supply Voltage

-0.3

3.0

V

V

-0.3

V

Storage Temperature Range

-65

+150

°C

Lead Temperature (Solder 4 sec.)

+260

°C

(1)

“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. "Recommended Operating Conditions"

indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed

specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions

listed. Note also that these maximum ratings imply that the voltage at all the power supply pins of VccRF, VccIF, VddRF, and VddIF are

(2)

This Device is a high performance RF integrated circuit with an ESD rating < 2 kV and is ESD sensitive. Handling and assembly of this

device should only be done at ESD-free workstations.

Copyright © 2004, Texas Instruments Incorporated

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