NIPPON PRECISION CIRCUITS-2

SM5160CM/DM

BLOCK DIAGRAM

11 or 14 BIT

R COUNTER

PHASE

DETECTOR

LOCK

DETECTOR

CHARGE

PUMP

16 BIT N COUNTER

FIN

DATA

LD

FV

XOUT

LE

CLK

FR

DOA

DOP

16 BIT LATCH

14 BIT LATCH

17 BIT SHIFT REGISTER

XIN

1/4

PRESCALER

LEVEL

SHIFTER

LEVEL

SHIFTER

VDD1

VDD2

VDD3

VDD1

VDD2

TEST

PIN DESCRIPTION

Number

Name

Description

1

XIN

Reference oscillator or external clock input. Internal feedback resistor for AC coupling

2

XOUT

Reference oscillator or external clock output. Oscillator is OFF when VDD1 is LOW.

3

VDD3

Supply voltage for sections not supplied by VDD1 and VDD2

4

DOA

Output to active lowpass filter. Single-ended, tristate output. Floating when VDD1 is LOW

5

DOP

Output to passive lowpass filter. Single-ended, tristate output Floating when VDD1 is LOW

6

VSS

Ground

7

FIN

Comparison frequency input. Internal feedback resistor for AC coupling

8

VDD1

Supply voltage for XIN and FIN amplifiers

9

VDD2

Supply voltage for N counter and R counter

10

LD

Unlock detector output. LOW when PLL is unlocked.

11

CLK

Shift register clock input

12

DATA

Serial data input

13

LE

Latch enable input

14

FV

Input frequency divider buffered output. This is level-shifted and input to the phase detector.

15

FR

Reference frequency divider buffered output. This is level-shifted and input to the phase detector.

16

TEST

Test input. Internal pull-down resistor