Precision Audio Clock Source

MDS 661 D

2

Revision 111804

Integrated Circuit Systems, Inc.

ICS661

Pin Assignment

16-pin 4.40 mil body, 0.50 mm pitch TSSOP

Output Clock Selection Table

Pin Descriptions

12

1

11

2

10

X1/REFIN

X2

3

9

VDD

4

VDD

REF

5

S0

6

VDDR

7

GND

8

GND

GND

SELIN

VDDO

S3

S1

S2

CLK

16

15

14

13

S3

S2

S1

S0

Input

Frequency

(MHz)

Output

Frequency

(MHz)

0000

27

8.192

0001

27

11.2896

0010

27

12.288

0011

27

24.576

0100

27

12.288

0101

27

16.9344

0110

27

18.432

0111

27

36.864

1000

27

16.384

1001

27

22.5792

1010

27

24.576

1011

27

49.152

1100

27

24.576

1101

27

33.8688

1110

27

36.864

1111

27

73.728

Pin

Number

Pin

Name

Pin

Type

Pin Description

1

X1/REFIN

Input

Connect this pin to a crystal or clock input

2

VDD

Power

Power supply for crystal oscillator.

3

VDD

Power

Power supply for PLL.

4

S0

Input

Output frequency selection. Determines output frequency per table above. On chip pull-up.

5

GND

Power

Connect to ground.

6

GND

Power

Ground for output stage.

7

S3

Input

Output frequency selection. Determines output frequency per table above. On chip pull-up.

8

S2

Input

Output frequency selection. Determines output frequency per table above. On chip pull-up.

9

CLK

Output

Clock output.

10

S1

Input

Output frequency selection. Determines output frequency per table above. On chip pull-up.

11

VDDO

Power

Power supply for output stage.

12

SELIN

Input

Low for clock input, high for crystal. On chip pull-up.

13

GND

Power

Connect to ground.

14

VDDR

Power

Power supply for reference output. Ground to turn off REF.

15

REF

Output

Reference clock output.

16

X2

Input

Connect this pin to a crystal. Leave open if using a clock input.