AD9853 Analog Devices, AD9853 Datasheet
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AD9853
Manufacturer Part Number
AD9853
Description
Programmable Digital OPSK/16-QAM Modulator
Manufacturer
Analog Devices
Datasheet
1.AD9853.pdf
(31 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD9853AS
Manufacturer:
ADI
Quantity:
20 000
Part Number:
AD9853BRU
Manufacturer:
ADI/亚德诺
Quantity:
20 000
a
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
6
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
X
6
Function: 5 MHz–42 MHz/
PREAMBLE
INSERTION
DELAY
& MUX
DATA
ENCODER:
D16-QAM
16-QAM
DQPSK
QPSK
FSK
FUNCTIONAL BLOCK DIAGRAM
FILTER
FILTER
ENABLE/
DISABLE
FIR
FIR
FEC
INTERPOLATION
INTERPOLATION
T
X
ENABLE
FILTER
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
10
Programmable Digital
AD9853
World Wide Web Site: http://www.analog.com
FILTER
SYNC
INV
10
10-BIT
DAC
© Analog Devices, Inc., 1999
GAIN
CONTROL TO
DRIVER AMP
A
OUT
AD9853
TO LP FILTER
AND AD8320
CABLE DRIVER
AMPLIFER