RF SILICON AND SUBSYSTEMS SOLUTIONS
FOR BROADBAND COMMUNICATIONS AND AUTOMOTIVE ELECTRONICS
MT2122 SINGLE-CHIP
BROADBAND TUNER
PRODUCT BRIEF
The MT2122 is a fully integrated broadband
tuner for analog and digital OpenCable
set-top boxes, home gateways, cable
modems and HDTV applications.
MT2122 Single-Chip Broadband Tuner
The MicroTuner™ MT2122 is a
fully integrated single-chip tuner,
with functional blocks specifically
designed to ease implementation of
high-performance analog and digital
OpenCable™ set-top boxes. It
supports advanced analog/digital
set-top boxes (STB) including
OpenCable™, home gateways,
cable modems and HDTV
applications.
The MT2122 has been
developed to give manufacturers
design flexibility at low cost without
compromising high performance.
The MT2122 receives signal
from 48 – 1100 MHz. It features
integrated filter components and
controls that allow for a simple,
alignment-free pre-select filter. This
provides excellent end-to-end
linearity performance in severely
sloped input conditions. MT2122
greatly reduces complexity for the
Multimedia over Coax Alliance
(MoCA™) applications.
Its dual-conversion architecture
ensures consistent OpenCable -
compliant performance with no
manual alignment. The on-chip
buffer amplifier for Forward Data
Channel (FDC) reduces bill of
materials (BOM) cost while
improving performance compared to
solutions using a directional coupler.
The MT2122 includes a PIN
diode attenuator linearizer circuit that
can drive a PI-network pin diode
attenuator in the signal path. The
MT2122 also supports multi-tuner
front-end implementations and is
programmable through a serial bus
interface.
APPLICATIONS
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Advanced analog and digital
set-top boxes (STB) including
OpenCable.
Home gateways
Cable modems
HDTV
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FEATURES
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Output fully compatible with
demodulators for MoCA,
NTSC, PAL, SECAM, DAVIC,
DVB-C, DOCSIS®, Euro-
DOCSIS™, OpenCable and
other standards
On-chip amplifier for Forward
Data Channel (FDC)
Ease of multi-tuner front-end
implementations
Dual-conversion architecture
for consistent OpenCable
compliant performance
Serial control interface
One general purpose output
controllable via serial control
interface
On-chip frequency synthesis
system integrating PLL, VCOs
and varactors.
1.1 GHz bandwidth
No need for the 28 V to 33 V
supplies typically required by
traditional cable tuners
Automatic frequency control
(AFC) voltage detector for
frequency fine-tuning
Integrated temperature
sensor for thermally sensitive
systems
3.3 V and 5 V serial bus
compatible
No tunable parts required
Simple interface to external
filters
Software shutdown mode
Small 8 mm x 8 mm 56-pin
QFN package
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MICROTUNE [ MICROTUNE,INC ]
