Connection Diagrams

Pin Descriptions

Pin No.

2335/37

Pin No.

2336

Pin

Name

I/O

Description

11

V

Power supply voltage input for RF1 analog and RF1 digital circuits. Input may range

from 2.7V to 5.5V. V

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

22

V

Power supply for RF1 charge pump. Must be

≥ V

33

D

O

RF1 charge pump output. For connection to a loop filter for driving the input of an

external VCO.

4

4

GND

LMX2335/37: Ground for RF1 analog and RF1 digital circuits. LMX2336: Ground for RF

digital circuitry.

55

f

I

First RF prescaler input. Small signal input from the VCO.

X6

f

I

RF1 prescaler complementary input. A bypass capacitor should be placed as close as

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

with loss of some sensitivity.

X

7

GND

Ground for RF1 analog circuitry.

6

8

OSC

in

I

Oscillator input. The input has a V

external CMOS or TTL logic gate.

7

9

OSC

out

O

Oscillator output.

810

F

O

Multiplexed output of the programmable or reference dividers, lock detect signals and

Fastlock mode. CMOS output

(see Programmable Modes).

9

11

Clock

I

High impedance CMOS Clock input. Data for the various latches is clocked in on the

rising edge, into the 20-bit shift register.

10

12

Data

I

Binary serial data input. Data entered MSB first. The last two bits are the control bits.

High impedance CMOS input.

11

13

LE

I

Load enable high impedance CMOS input. When LE goes HIGH, data stored in the

shift registers is loaded into one of the 4 appropriate latches (control bit dependent).

X

14

GND

Ground for RF2 analog circuitry.

X15

f

I

RF2 prescaler complementary input. A bypass capacitor should be placed as close as

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

with loss of some sensitivity.

12

16

f

I

RF2 prescaler input. Small signal input from the VCO.

13

17

GND

circuits. LMX2336: Ground for RF2 digital, MICROWIRE, F

14

18

D

O

RF2 charge pump output. For connection to a loop filter for driving the input of an

external VCO.

15

19

V

Power supply for RF2 charge pump. Must be

≥ V

LMX2335/LMX2337

DS012332-2

Order Number LMX2335M/LMX2335TM or

LMX2337M/LMX2337TM

NS Package Number M16A and MTC16

LMX2336

DS012332-16

Order Number LMX2336TM

NS Package Number MTC20

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