GC3021 datasheet(3/37 Pages) TI1

3 / 37 page

GRAYCHIP, INC.

- 1 -

JUNE 22, 1998

GC3021 MIXER AND CARRIER REMOVAL CHIP

DATA SHEET

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

GC3021 DATASHEET

1.1

BLOCK DIAGRAM

A block diagram illustrating the major functions of the chip is shown in Figure 1

Figure 1. GC3021 BLOCK DIAGRAM

INPUT

FORMAT

MIXER

OUTPUT

FORMAT

PHASE ERROR

LOOKUP RAM

4K BY 1 Memory

SNAPSHOT

RAM

NCO

CIRCUIT

PHASE

LOCK

LOOP

CIRCUIT

Complex data at 70 MHz

Real data at 140 MHz

DATA OUT

Quad 64 Word

Memory

12 Bits

1 Bit

32 Bits

HSCK

DATA IN

Odd/Even Complex Pairs,

Complex Samples,

or I/Q Symbols

(70 MHz)

EIN

1 Bit

CIN

1 Bit

EOUT

SYNC

COUNTER

HSI

HCKO

A[0:8]

9 Bits

16 Bits

R/W

C[0:15]

CONTROL

INTERFACE

Internal Controls

Internal

Syncs

CKENA

CLOCK

GENERATOR

Internal

Clocks

CKENB

I[0:11]

Q[0:11]

YA[0:11]

YB[0:11]

YC[0:11]

YD[0:11]

High speed

clock and sync

Carry In

sync

HSO

AND

DC REMOVAL

MIXER MODE

•

160 MSPS real input data

(differential PECL data and clock)

•

80 MSPS complex input data

(TTL level inputs)

•

12 bit inputs and outputs

•

32 bit NCO phase control

•

NCO generates 12 bit sines and cosines

1.0

KEY FEATURES

CARRIER REMOVAL MODE

•

80 Million Complex Samples per second (CSPS)

input data

•

12 bit input and output data

•

12 bit by 12 bit complex multiplier

•

4K bit phase error lookup RAM

•

Phase error feedback loop for carrier and

phase offset removal

•

32 bit numerically controlled oscillator (NCO)

•

Snapshot memory for adaptive filtering

OVERALL

•

Microprocessor

interface

for

control,

output, and diagnostics

•

Built in diagnostics

•

750 mW power at 50 MHz, 5 volts

•

200 mW at 30 MHz, 3.3 volts

•

160 pin plastic quad flat pack package

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