GC4014 datasheet(6/46 Pages) TI

6 / 46 page

GRAYCHIP, INC.

- 1 -

APRIL 27, 1999

GC4014 QUAD RECEIVER CHIP

DATA SHEET REV 0.6

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

GC4014 DATASHEET

2.0

BLOCK DIAGRAM

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

Figure 1. GC4014 Block Diagram

CLOCK DOUBLING

AND

DISTRIBUTION CIRCUIT

CONTROL INTERFACE

A[0:4]

C[0:7]

SYNC COUNTER

AND

DIAGNOSTIC TEST

GENERATOR

AND FILTER

OUTPUT

FORMAT

AND GAIN

BANDWIDTH

FILTER SELECT

DECIMATE BY 8

FORMAT

SELECT

AOUT

(BIT SERIAL)

BOUT

(BIT SERIAL)

OUTPUT

FORMAT

AND GAIN

TWO STAGE

DECIMATE

BY 4OR 8

GAIN

DECIMATE

BY 8 TO 16K

FILTER

DECIMATE

BY 8 TO 16K

FILTER

AIN

BIN

OUTPUT

FORMAT

AND GAIN

COUT

(BIT SERIAL)

DOUT

(BIT SERIAL)

OUTPUT

FORMAT

AND GAIN

GAIN

DECIMATE

BY 8 TO 16K

FILTER

DECIMATE

BY 8 TO 16K

FILTER

CIN

DIN

(14 BITS)

CROSSBAR SWITCH

OUTPUT SUM AND MULTIPLEX

ACKNOWLEDGE

DIAGNOSTICS

(16 bit input mode uses the DIN pins for the LSB’s of inputs AIN, BIN, and CIN)

FILTER

TWO STAGE

DECIMATE

BY 4OR 8

FILTER

TWO STAGE

DECIMATE

BY 4OR 8

FILTER

TWO STAGE

DECIMATE

BY 4OR 8

FILTER

COEFFICIENT RAMS

1.0

KEY FEATURES

•

Input rates up to 64 MSPS

•

Four real input down-convert channels or

Two complex input downconvert channels

•

Independent tuning frequencies

•

Independent phase/gain controls

•

4 by 4 14 bit Input Crossbar switch or

3 by 4 16 bit Input Crossbar switch

•

Decimation factors of

16 to 32,768 in the real output mode

32 to 65,536 in the complex output mode

•

Zero padding for lower decimation factors

•

Outputs can be either:

bit serial,

nibble serial (link port)

or memory mapped

•

Output summing for beamforming

•

8 to 16 bit output samples

•

0.02 Hz tuning resolution

•

0.14 dB gain resolution

•

Less than 0.05 dB peak to peak passband

ripple

•

Greater than 100 dB far image rejection

•

Greater than 95 dB spur free dynamic range

•

User programmable 63 tap output filter

•

Nyquist filtering for QPSK or QAM symbol

data

•

Meets GSM, AMPS and DAMPS Cellular

specifications

•

Microprocessor interface for control, output,

and diagnostics

•

Built in diagnostics

•

Microprocessor interface will accept either

3.3 or 5 volt input levels

•

250 mW per channel at 50 MHz, 3.3 volts

•

100 pin thin QFP package

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