Connection Diagrams

Pin Descriptions

Pin No.

for CSP

Package

Pin No.

for

TSSOP

package

Pin Name

I/O

Description

24

1

OUT0

O

Programmable CMOS output. Level of the output is controlled by IF_N [17] bit.

1

2

Vcc

RF

-

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

5.5 V. Bypass capacitors should be placed as close as possible to this pin and be

connected directly to the ground plane.

23

V

pRF

-

Power supply for RF charge pump. Must be

≥V

34

CP

oRF

O

RF charge pump output. Connected to a loop filter for driving the control input of an

external VCO.

4

5

GND

-

Ground for RF PLL digital circuitry.

5

6

fin RF

I

RF prescaler input. Small signal input from the VCO.

6

7

fin RF

I

RF prescaler complimentary input. A bypass capacitor should be placed as close as

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

7

8

GND

-

Ground for RF PLL analog circuitry.

8

9

OSCx

I/O

Dual mode oscillator output or RF R counter input. Has a Vcc/2 input threshold when

configured as an input and can be driven from an external CMOS or TTL logic gate.

Can also be configured as an output to work in conjunction with OSCin to form a

crystal oscillator. (See functional description 1.1 and programming description 3.1.)

DS100831-2

Order Number LMX2350TM or LMX2352TM

NS Package Number MTC24

DS100831-22

www.national.com

2