SM8720AV datasheet(2/6 Pages) NPC

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SM8720AV

NIPPON PRECISION CIRCUITS INC.—2

BLOCK DIAGRAM

PIN DESCRIPTION

Number

Name

I/O

Description

VDD1

–

Supply voltage 1

FIN

Master clock input (27MHz constant input)

VSS1

–

Supply ground 1

CLK3OUT

Clock output 3 (36/45/48.6MHz switchable output)

CLK3_ON

Output clock enable 3 (HIGH = enable, LOW = disable)

SEL1

Output select 1

CLK1_ON

Output clock enable 1 (HIGH = enable, LOW = disable)

VDD2

–

Supply voltage 2

CLK1OUT

Clock output 1 (22.5792MHz constant output)

VSS2

–

Supply ground 2

CLK2OUT

Clock output 1 (48MHz constant output)

VDD3

–

Supply voltage 3

CLK2_ON

Output clock enable 3 (HIGH = enable, LOW = disable)

SEL2

Output select 2

VSS3

–

Supply ground 3

REFOUT

Master clock output (27MHz constant output)

CLK1_ON

FIN

Reference

Divider 1

Phase

Detector 1

Charge

Pump 1

LPF 1

VCO 1

Control

Logic

CLK1OUT

Loop

Divider 1

(PLL1)

Reference

Divider 2

Phase

Detector 2

Charge

Pump 2

LPF 2

VCO 2

Loop

Divider 2

(PLL2)

Reference

Divider 3

Phase

Detector 3

Charge

Pump 3

LPF 3

VCO 3

Loop

Divider 3

(PLL3)

CLK2_ON

CLK3_ON

CLK2OUT

CLK3OUT

SEL2

SEL1

REFOUT

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