NIPPON PRECISION CIRCUITS-2

SM5158AS

BLOCK DIAGRAM

PIN DESCRIPTION

16 BIT COUNTER

PHASE

DETECTOR

LOCK

DETECTOR

CHARGE

PUMP

16 BIT N COUNTER

FIN

DATA

LD

FV

XOUT

LE

CLK

FR

DOA

DOP

OV

OR

16 BIT LATCH

BUFFER

16 BIT LATCH

17 BIT SHIFT REGISTER

XIN

Number

Name

Description

1

XIN

To connect external crystal and capacitor, or external clock input pin.

2

XOUT

To connect external crystal and capacitor,or oscilator output signal can be available at this pin.

3

FV

Buffered input frequency divider output.phase detector input

4

VDD

Positive supply pin. Apply +2.7 to 5.5 Volts.

5

DOP

Charge pump output for passive lowpass filter. Single ended tristate output.

6

VSS

Ground.

7

LD

Lock detector output. Logic Low when PLL is unlocked.

8

FIN

Comparison frequency input.Internal feedback resistor for AC coupling.

Input frequency range 20MHz to 200MHz.

9

CLK

Shift register clock input.

10

DATA

Serial data input.

11

LE

Latch enable input.

12

DOA

Chrage pump output for active lowpass filter. Single ended tristate output.

13

FR

Buffered reference frequency devider output. Phase detector input.

14

TEST

Test pin. Left open.

15

OV

Buffered phase detector output to a differential lowpass filter.

16

OR

Buffered phase detector output to a differential lowpass filter.