ICS3771-18

DTV, STB CLOCK SOURCE

SYNTHESIZERS

IDT™ / ICS™ DTV, STB CLOCK SOURCE

2

ICS3771-18

REV B 111307

Pin Assignment

16-pin TSSOP

Output Clock Selection Table (MHz)

*OFF = output is driven HIGH.

Pin Descriptions

12

1

11

2

10

CLKIN

NC

3

9

VDD

4

AVDD

OE

5

NC

6

FS1

7

GNDA

8

GND

GND

CLK1

VDDL

REFOUT2

FS0

REFOUT1

CLK2

16

15

14

13

OE FS1 FS0

CLK1/CLK2

REFOUT1/REFOUT2

000

OFF*

27

001

OFF*

27

010

OFF*

27

011

OFF*

27

1

0

0

27

27

1

0

1

27.027

27

1

1

0

74.250

27

1

1

1

74.17582418

27

Pin

Numbe

r

Pin

Name

Pin

Type

Pin Description

1

CLKIN

Input

Reference clock input. Connect to a 27 MHz external clock.

2

VDD

Power

Power supply.

3

AVDD

Power

Power supply. Connect to 3.3 V.

4

NC

–

No connect. Leave floating.

5

GNDA

Power

Analog ground.

6

GND

Power

Connect to ground.

7

REFOUT

Output

Reference Clock output 2. See table above.

8

REFOUT

Output

Reference Clock output 1. See table above.

9

CLK2

Output

Selectable Clock output 2. See table above.

10

FS0

Input

Frequency select pin 0. Weak internal pull-up. See table above.

11

VDDL

Power

Power supply. Connect to 3.3 V.

12

CLK1

Output

Selectable Clock output 1. See table above

13

GND

Power

Connect to ground.

14

FS1

Input

Frequency select pin 1. Weak internal pull-up. See table above.

15

OE

Output

Output Enable pin. Weak internal pull-up. See table above.

16

NC

–

No connect. Leave floating.