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AD9878, AD9878-EB, AD9879

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Info of AD9878
Info of AD9878-EB
Info of AD9879

AD9878, AD9878-EB, AD9879 Selling Leads, Datasheet

MFG:Analog Devices Inc Category:Programmers, Development Systems Package Cooled:TQFP-100 D/C:2010+

AD9878, AD9878-EB, AD9879 Datasheet download

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Part Number: AD9878

Category: Programmers, Development Systems

MFG: Analog Devices Inc

Package Cooled: TQFP-100

D/C: 2010+

Description: BOARD EVAL FOR AD9878

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AD9878 General Description

The AD9878 is a single-supply, cable modem/set-top box, mixed-signal front end. The device contains a transmit path interpolation filter, a complete quadrature digital upconverter, and a transmit DAC. The receive path contains dual 12-bit ADCs and a 10-bit ADC. All internally required clocks and an output system clock are generated by the phase-locked loop (PLL) from a single crystal oscillator or clock input.

The transmit path interpolation filter provides an upsampling factor of 16* with an output signal bandwidth up to 4.35 MHz. Carrier frequencies up to 65 MHz with 26 bits of frequency tuning resolution can be generated by the direct digital synthesizer (DDS). The transmit DAC resolution is 12 bits and can run at sampling rates as high as 232 MSPS. Analog output scaling from 0 dB to 7.5 dB in 0.5 dB steps is available to preserve SNR when reduced output levels are required.

The 12-bit ADCs provide excellent undersampling performance, allowing this device to typically deliver better than 10 ENOBs with IF inputs up to 70 MHz. The 12-bit IF ADCs can sample at
rates up to 29 MHz, allowing them to process wideband signals.

The AD9878 includes a programmable -? DAC, which can be used to control an external component such as a variable gain amplifier (VGA) or a voltage controlled tuner.

The AD9878 also integrates a CA port that enables a host processor to interface with the AD832x family of programmable gain amplifier (PGA) cable drivers or industry equivalent via
the MxFE serial port (SPORT).

The AD9878 is available in a 100-lead, LQFP package. The AD9878 is specified over the extended industrial (-40°C to +85°C) temperature range.

AD9878 Maximum Ratings

Parameter	Rating
Power Supply (V_AVDD, V_DVDD, V_DRVDD) Digital Output Current Digital Inputs Analog Inputs Operating Temperature Maximum Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec)	3.9 V 5 mA -0.3 V to VDRVDD + 0.3 V -0.3 V to VAVDD + 0.3 V -40°C to +85°C 150°C -65°C to +150°C 300°C

AD9878 Features

Low cost 3.3 V CMOS MxFE(TM) for broadband applications
DOCSIS, EURO-DOCSIS, DVB, DAVIC compliant
232 MHz quadrature digital upconverter
12-bit direct IF DAC (TxDAC+^(R))
Up to 65 MHz carrier frequency DDS
Programmable sampling clock rates
Analog Tx output level adjust
Dual 12-bit, 29 MSPS direct IF ADCs with video clamp input
10-bit, 29 MSPS sampling ADC
8-bit -? auxiliary DAC
Direct interface to AD832x family of PGA cable drivers

AD9878 Typical Application

Cable set-top boxes
Cable and wireless modems

AD9878 Connection Diagram

AD9878-EB Parameters

Technical/Catalog Information	AD9878-EB
Vendor	Analog Devices Inc
Category	Programmers, Development Systems
Type	ADC + DAC, Codec, Frontend for RF
Contents	Evaluation Board
For Use With/Related Products	AD9878
RoHS Status	RoHS Non-Compliant
Other Names	AD9878 EB AD9878EB

AD9879 General Description

The AD9879 is a single-supply set-top box and cable modem mixed-signal front end. The device contains a transmit path interpolation filter, complete quadrature digital upconverter, and transmit DAC. The receive path contains a 12-bit ADC, a 10-bit ADC, and dual 7-bit ADCs. All internally required clocks and an output system clock are generated by the phase-locked loop (PLL) from a single crystal or clock input.

The transmit path interpolation filter provides an upsampling factor of 16* with an output signal bandwidth as high as 8.3 MHz. Carrier frequencies up to 65 MHz with 26 bits of frequency tuning resolution can be generated by the direct digital synthesizer (DDS). The transmit DAC resolution is 12 bits and can run at sampling rates as high as 232 MSPS. Analog output scaling from 0.0 dB to 7.5 dB in 0.5 dB steps is available to preserve SNR when reduced output levels are required.

The 12-bit and 10-bit IF ADCs can convert direct IF inputs up to 70 MHz and run at sample rates up to 33 MSPS. A video input with an adjustable signal clamping level, along with the 10-bit ADC, allow the AD9879 to process an NTSC and a QAM channel simultaneously.

The programmable - DAC can be used to control external components, such as variable gain amplifiers (VGAs) or voltage controlled tuners. The CA port provides an interface to the AD8321/AD8323 or AD8322/AD8327 programmable gain amplifier (PGA) cable drivers, enabling host processor control via the MxFE SPORT.

The AD9879 is available in a 100-lead MQFP. It offers enhanced receive path undersampling performance and lower cost when compared with the pin-compatible AD9873. The AD9879 is specified over the commercial (−40°C to +85°C) temperature range.

AD9879 Maximum Ratings

Parameter	Rating
Power Supply (V_AVDD,V_DVDD,V_DRVDD) Digital Output Current Digital Inputs Analog Inputs Operating Temperature Maximum Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec)	3.9 V 5 mA −0.3 V to V_DRVDD + 0.3 V −0.3 V to V_AVDD + 0.3 V −40°C to +85°C 150°C −65°C to +150°C 300°C

AD9879 Features

Low cost 3.3 V MxFE™ for
   DOCSIS-, EURO-DOCSIS-, DVB-, DAVIC-compliant
   set-top box and cable modem applications
232 MHz quadrature digital upconverter
   12-bit direct IF DAC (TxDAC+™)
   Up to 65 MHz carrier frequency DDS
   Programmable sampling clock rates
   16* upsampling interpolation LPF
   Single-tone frequency synthesis
   Analog Tx output level adjust
   Direct cable amp interface
12-bit, 33 MSPS direct IF ADC
   with optional video clamping input
10-bit, 33 MSPS direct IF ADC
Dual 7-bit, 16.5 MSPS sampling I/Q ADC
12-bit -∆ auxiliary DAC

AD9879 Typical Application

Cable modem and satellite systems
Set-top boxes
Power line modem
PC multimedia
Digital communications
Data and video modems
QAM, OFDM, FSK modulation

AD9879 Connection Diagram

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