Marvell 88DE8020/25 Hybrid Demodulators
Supports DVB-C/DVB-T/Analog-TV Standards
PRODUCT OVERVIEW
The Marvell
®
88DE8020 and 88DE8025 hybrid demodulators with integrated ClearRF
TM
technology enable robust
TV reception under complex signal impairment conditions in terrestrial and cable networks. The demodulators
are compatible with typical low/high IF tuners and TV decoders. The 88DE8020 supports DVB-C/DVB-T/NTSC/
PAL/SECAM demodulation, while the 88DE8025 supports DVB-T/NTSC/PAL/SECAM demodulation. Both devices
can demodulate 2K and 8K COFDM modulated signals based on the ETSI specification (ETSI EN 300 744) and
QAM modulated signals based on the DVB-C specification (ETSI EN 300 429). They can also be programmed to
demodulate analog NTSC/PAL/SECAM TV inputs and output CVBS and Sound IF signals.
BLOCK DIAGRAM
To Crystal
PLL
DVB-C
Demodulator
(Not Available in DE8025)
Outer
De-Interleaving
DVB-T
Demodulator
IF
From Tuner
IF
ADC
Common
Front End
NTSC/PAL/SECAM
Demodulator
Audio
Processing
Analog/DTV
Mode
Detection
Video
Processing
RS
Decoding
MPEG
Formatter
MPEG2-TS
Video
DAC
CVBS
Audio
DAC
SIF
TWSI
Repeater
TWSI
Slave
To Tuner
To Host
Micro-Controller
Fig 1. Block Diagram of Marvell 88DE8020 and 88DE8025 Hybrid Demodulators
KEY FEATURES AND BENEFITS
FEATURES
•
Low profile single chip hybrid demodulator with option to use clock
from tuner source
•
Pin-compatible with Marvell demodulators supporting other standards
•
ClearRF technology provides robust performance exceeding standard
DVB-T requirements
BENEFITS
•
Enables slim TV chassis with lower bill of materials. No need for multiple
chips, SAW filters, crystals and passives
•
Enables TV makers to develop single worldwide multiformat decoder
chassis with plug-and-play RF front-end
•
Good reception in challenging field conditions including:
- Adjacent/co-channel interference from changing troposphere
conditions
- Dynamic echoes in Single Frequency Network (SFN) countries like
Germany/Spain
- Local noise from household appliances, light switches and ignition
systems
•
ClearRF technology provides excellent C/N performance in challenging
DVB-C 256QAM networks
•
ClearRF technology provides good picture quality even for standard
analog signals
•
Hybrid blind scan for simultaneous detection of analog and digital
signals from terrestrial and cable networks
•
Robust cable reception in DVB-C networks carrying High Definition (HD)
signals
•
Sharp picture and tolerance to over-modulated signals
•
Quick out-of-box TV setup for seamless analog, digital channel
reception
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
