GRAYCHIP, INC.

- i -

JUNE 22, 1998

GC3021 MIXER AND CARRIER REMOVAL CHIP

DATA SHEET

This document contains information which may be changed at any time without notice

1.0

KEY FEATURES.......................................................................................................................... 1

1.1

BLOCK DIAGRAM................................................................................................................................. 1

2.0

FUNCTIONAL DESCRIPTION ................................................................................................... 2

2.1

CONTROL INTERFACE ....................................................................................................................... 2

2.2

SYNC COUNTER ................................................................................................................................. 3

2.3

CLOCK GENERATOR ......................................................................................................................... 4

2.4

INPUT FORMAT ................................................................................................................................... 4

2.5

MIXER .................................................................................................................................................. 6

2.6

SYMBOL ALIGN ................................................................................................................................... 7

2.7

PHASE ERROR RAM .......................................................................................................................... 7

2.8

PHASE LOCK LOOP ............................................................................................................................ 8

2.9

NCO ...................................................................................................................................................... 9

2.10

SNAPSHOT RAM ............................................................................................................................... 10

2.11

OUTPUT FORMAT ............................................................................................................................. 10

2.12

DATA DELAYS ................................................................................................................................... 10

2.13

POWER DOWN AND KEEP ALIVE CIRCUIT .................................................................................... 11

2.14

DIAGNOSTICS ................................................................................................................................... 11

3.0

PACKAGING ............................................................................................................................ 12

3.1

PIN DESCRIPTIONS........................................................................................................................... 13

4.0

CONTROL REGISTERS ...........................................................................................................15

4.1

MODE CONTROL REGISTER ........................................................................................................... 16

4.2

SYNC CONTROL REGISTERS ......................................................................................................... 17

4.3

DELAY CONTROL REGISTER .......................................................................................................... 18

4.4

COUNTER CONTROL REGISTER ....................................................................................................18

4.5

PLL CONTROL REGISTER ............................................................................................................... 19

4.6

FREQUENCY WORD REGISTERS ................................................................................................... 19

4.7

OUTPUT CONTROL REGISTERS ....................................................................................................20

4.8

SNAPSHOT CONTROL REGISTER .................................................................................................. 21

4.9

PHASE REGISTER ............................................................................................................................ 21

4.10

ONE SHOT ADDRESS ...................................................................................................................... 21

4.11

TEST OUTPUT REGISTER ............................................................................................................... 21

5.0

SPECIFICATIONS .................................................................................................................... 22

5.1

ABSOLUTE MAXIMUM RATINGS ..................................................................................................... 22

5.2

RECOMMENDED OPERATING CONDITIONS ................................................................................. 22

5.3

DC CHARACTERISTICS ................................................................................................................... 22

5.4

AC CHARACTERISTICS .................................................................................................................... 22

5.5

HIGH SPEED MODE SPECIFICATIONS ........................................................................................... 24

6.0

APPLICATION NOTES ............................................................................................................. 25

6.1

POWER AND GROUND CONNECTIONS ......................................................................................... 25

6.2

STATIC SENSITIVE DEVICE ............................................................................................................. 25

6.3

REDUCED VOLTAGE OPERATION .................................................................................................. 25

6.4

HIGH SPEED MIXER ......................................................................................................................... 25

6.5

QAM DEMODULATOR ...................................................................................................................... 26

6.6

DIAGNOSTICS.................................................................................................................................... 27