AD9853 Analog Devices, AD9853 Datasheet

AD9853

Manufacturer Part Number

AD9853

Description

Programmable Digital OPSK/16-QAM Modulator

Manufacturer

Analog Devices

Datasheet

1.AD9853.pdf (31 pages)

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REV. C

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

DATA IN

SERIAL

FEATURES

Universal Low Cost Solution for HFC Network

Return-Channel T

165 MHz Internal Reference Clock Capability

Includes Programmable Pulse-Shaping FIR Filters and

FSK/QPSK/DQPSK/16-QAM/D16-QAM Modulation

Integrated Reed-Solomon FEC Function

Programmable Randomizer/Preamble Function

Supports Interoperable Cable Modem Standards

Internal SINx/x Compensation

>50 dB SFDR @ 42 MHz Output Frequency (Single Tone)

Controlled Burst Mode Operation

+3.3 V to +5 V Single Supply Operation

Low Power: 750 mW @ Full Clock Speed (3.3 V Supply)

Space Saving Surface Mount Packaging

APPLICATIONS

HFC Data, Telephony and Video Modems

Wireless LAN

Programmable Interpolating Filters

5 MHz–65 MHz

Formats

Internal Reference Clock Multiplier

RANDOMIZER

CLOCK

FEC

R-S

REF CLOCK IN

XOR

Function: 5 MHz–42 MHz/

PREAMBLE

INSERTION

DELAY

& MUX

DATA

ENCODER:

D16-QAM

16-QAM

DQPSK

QPSK

FSK

FUNCTIONAL BLOCK DIAGRAM

FILTER

ENABLE/

DISABLE

FIR

FEC

INTERPOLATION

ENABLE

FILTER

CONTROL FUNCTIONS

RESET

GENERAL DESCRIPTION

The AD9853 integrates a high speed direct-digital synthesizer

(DDS), a high performance, high speed digital-to-analog con-

verter (DAC), digital filters and other DSP functions onto a

single chip, to form a complete and flexible digital modulator

device. The AD9853 is intended to function as a modulator in

network applications such as interactive HFC, WLAN and

MMDS, where cost, size, power dissipation, functional integra-

tion and dynamic performance are critical attributes.

The AD9853 is fabricated on an advanced CMOS process and

it sets a new standard for CMOS digital modulator performance.

The device is loaded with programmable functionality and

provides a direct interface port to the AD8320, digitally-

programmable cable driver amplifier. The AD9853/AD8320

chipset forms a highly integrated, low power, small footprint

and cost-effective solution for the HFC return-path requirement

and other more general purpose modulator applications.

The AD9853 is available in a space saving surface mount pack-

age and is specified to operate over the extended industrial

temperature range of –40 C to +85 C.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

SINE

DDS

SERIAL CONTROL BUS:

32-BIT OUTPUT FREQUENCY TUNING WORD

INPUT DATA RATE/MODULATION FORMAT

FEC/RANDOMIZER/PREAMBLE ENABLE/CONFIGURATION

FIR FILTER COEFFICIENTS

REF CLOCK MULTIPLIER ENABLE

I/Q PHASE INVERT

SLEEP MODE

COSINE

QPSK/16-QAM Modulator

Programmable Digital

AD9853

World Wide Web Site: http://www.analog.com

FILTER

SYNC

INV

10-BIT

DAC

GAIN

CONTROL TO

DRIVER AMP

OUT

AD9853

TO LP FILTER

AND AD8320

CABLE DRIVER

AMPLIFER

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