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AD9870AST, AD9873, AD9873JS

Table of contents:
Info of AD9870AST
Info of AD9873
Info of AD9873JS

AD9870AST, AD9873, AD9873JS Selling Leads, Datasheet

MFG:ADI Package Cooled:QFP D/C:09+

AD9870AST, AD9873, AD9873JS Datasheet download

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Part Number: AD9870AST

MFG: ADI

Package Cooled: QFP

D/C: 09+

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AD9873 General Description

The AD9873 integrates a complete 232 MHz quadrature digital transmitter and a multichannel receiver with four high-performance analog-to-digitalconverters (ADC) for various video and digital data signals. The AD9873 is designed for cable modem set-top box applications, where cost, size, power dissi-pation, and dynamic performance are critical attributes. A single external crystal is used to control all internal conversion and data processing cycles.

The transmit section of the AD9873 includes a high-speed direct digital synthesizer (DDS), a high-performance, high-speed 12-bit digital-to-analog converter (DAC), programmable clock multiplier circuitry, digital filters, and other digital signal processing functions, to form a complete quadrature digital up-converter device.On the receiver side, two 8-bit ADCs are optimized for IQ demodulated "out-of band" signals. An on-chip 10-bit ADC is typically used as a direct IF input of 256 QAM modulated signals in cable modem applications. A second direct IF input and an auxiliary video input with automatic programmable clamp
function are multiplexed to a high-performance 12-bit video ADC. The chip's programmable sigma-delta modulated outputs and an output clock may be used to control external components such as programmable gain amplifiers (PGA) and mixer stages. Three pins provide a direct interface to the AD8321/AD8323
programmable gain amplifier (PGA) cable driver.

The AD9873 is available in a space-saving 100-lead MQFP package.

AD9873 Maximum Ratings

Power Supply (VAS, VDS) . . . . . . . . . . . . . . . . . . . . . 3.9 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Digital Inputs . . . . . . . . . . . . . . . 0.3V to DRVDD + 0.3V
Analog Inputs . . . . . . . . . . . . .0.3 V to AVDD (IQ) +0.3V
Operating Temperature . . . . . . . . . . . . . . . . . . 0 to 70
Maximum Junction Temperature . . . . . . . . . . . . . . . . 150
Storage Temperature . . . . . . . . . . . . . . . 65 to +150
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . 300

AD9873 Features

Low-Cost 3.3 V CMOS Analog Front End Converter for
MCNS-DOCSIS, DVB, DAVIC-Compliant
Set-Top Box, Cable Modem Applications
232 MHz Quadrature Digital Upconverter
DC to 65 MHz Output Bandwidth
12-Bit Direct IF D/A Converter (TxDAC+ )^(R)
Programmable Reference Clock Multiplier (PLL)
Direct Digital Synthesis
Interpolator
SIN(x)/x Compensation Filter
Four Programmable, Pin-Selectable Modulator Profiles
Single-Tone Mode for Frequency Synthesis Applications
12-Bit, 33 MSPS Sampling Direct IF A/D Converter with
Auxiliary Automatic Clamp Video Input Multiplexer
10-Bit, 33 MSPS Sampling Direct IF A/D Converter
Dual 8-Bit, 16.5 MSPS Sampling IQ A/D Converter
Two Independently Programmable Sigma-Delta
Converters
Direct Interface to AD8321/AD8323 PGA Cable Driver
Programmable Frequency Output
Power-Down Modes

AD9873 Typical Application

Cable and Satellite Systems
PC Multimedia
Digital Communications
Data and Video Modems
Cable Modem
Set-Top Boxes
Powerline Modem
Broadband Wireless Communication

AD9873 Connection Diagram

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