PRODUCT BRIEF
• ATSC Compliant 8/16 VSB
• SCTE DVS-031, ITU-J.83B, and MCNS
DOCSIS compliant 64/256 QAM
demodulation and error correction
• Superior, dynamic and static multipath
performance
• Equalization Range: -4.0 µsec to
44.6 µsec
• Superior interference cancellation
(adjacent, co-channel ATSC, CSO/CTB)
• High phase noise tolerance
• Fast acquisition < 50 msec
• High Performance Internal 10 Bit A/D
converter with internal reference
• All Digital baud and carrier recovery,
No external VCO or VCXO required
• Supports both low IF sampling and
direct IF sampling at 43.75 or 44 MHz
• Parallel and Serial MPEG Data Output
• Integrated Deinterleaver RAM
• FEC error statistics are available to host
• Integrated signal quality indicator
•I
2
C control interface
• 2.5/3.3 Volt power / 3.3 Volt compatible
interface
• Low Power: 1.25W
• Available in a 100 Pin TQFP Package
NXT2000
VSB/QAM Receiver
The NXT2000 Multimode IC can be configured to work in either the 8 VSB mode for
terrestrial broadcasting or in one of 64 QAM, 256 QAM or 16 VSB mode for cable TV.
The 8/16 VSB is ATSC compliant, and the 64/256 QAM is ITU-J.83B/SCTE DVS-031/
MCNS DOCSIS compliant. The IC includes both demodulation and forward-error-
correction capabilities for all modes.
The chip’s 8 VSB mode demonstrates performance significantly better than what was
shown for the Grand Alliance system at the ATTC for a multitude of impairments such
as static and dynamic multipath, phase noise, and acquisition time. The equalization
range for the IC covers all known multipath conditions found in North America. The
chip is also robust in the presence of impairments such as adjacent and co-channel
NTSC interference, impulse noise, etc. The chip’s cable mode (especially 256 QAM
and 16 VSB) demonstrates superior performance in the presence of multipath, phase
noise, impulse noise, signal ingress – all impairments known to be significant problems
in the cable environment. Its performance in the presence of CTB/CSO is exceptional.
The chip includes a high performance internal A/D converter that is capable of direct
IF input or near baseband analog input. The symbol rate can be programmed for
different VSB/QAM modes without requiring a VCXO to drive the A/D converter. I2C
is used for control.
NxtWave Communications
6 Venture, Suite 350, Irvine, CA 92618 • Phone 949-585-1800 • Fax 949-585-1818
www.nxtwavecomm.com • marketing@nxtwavecomm.com
Demodulator/
Interface
Cancellation
Matched Filter/
Interpolator
Forward
Equalizer
Adaptation
Controller
10 BIT A/D
From I/F
To Tuner I/F
AGC
Synchronization
and Control
Carrier Tracking
Loop
VSB Framing
Control
I’C
Control
Trellis Decoder Deinter-
leaver
RS
Decoder
MPEG
Formatter
Frame Sync
Decision
Feedback
Equalizer
To Transport/MAC Layer
