Connection Diagrams

LMX1501A

TLW12340 – 2

JEDEC 16-Lead (0150 Wide) Small

Outline Molded Package (M)

Order Number LMX1501AM or LMX1501AMX

See NS Package Number M16A

LMX1511

TLW12340 – 3

20-Lead (0173 Wide) Thin Shrink

Small Outline Package (TM)

Order Number LMX1511TM or LMX1511TMX

See NS Package Number MTC20

Pin Descriptions

Pin No

Pin No

Pin Name

IO

Description

1501A

1511

1501A1511

1

1

I

Oscillator input A CMOS inverting gate input intended for connection to a

threshold and can be driven from an external CMOS or TTL logic gate May also

be used as a buffer for an externally provided reference oscillator

2

3

O

Oscillator output

34

45

Power supply voltage input Input may range from 27V to 55V Bypass

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

directly to the ground plane

56

O

Internal charge pump output For connection to a loop filter for driving the input

of an external VCO

6

7

GND

Ground

7

8

LD

O

Lock detect Output provided to indicate when the VCO frequency is in ‘‘lock’’

When the loop is locked the pin’s output is HIGH with narrow low pulses

810

I

Prescaler input Small signal input from the VCO

9

11

CLOCK

I

High impedance CMOS Clock input Data is clocked in on the rising edge into

the various counters and registers

10

13

DATA

I

Binary serial data input Data entered MSB first LSB is control bit High

impedance CMOS input

11

14

LE

I

Load enable input (with internal pull-up resistor) When LE transitions HIGH

data stored in the shift registers is loaded into the appropriate latch (control bit

dependent) Clock must be low when LE toggles high or low See Serial Data

Input Timing Diagram

12

15

FC

I

Phase control select (with internal pull-up resistor) When FC is LOW the

polarity of the phase comparator and charge pump combination is reversed

X

16

BISW

O

Analog switch output When LE is HIGH the analog switch is ON routing the

13

O

Monitor pin of phase comparator input Programmable reference divider output

14

O

Monitor pin of phase comparator input Programmable divider output

X17

O

Monitor pin of phase comparator input CMOS Output

15

18

O

requires a pull-up resistor

16

20

O

X

291219

NC

No connect

2