STV6120 STMICROELECTRONICS [STMicroelectronics], STV6120 Datasheet - Page 2

• Manufacturer Part Number: STV6120
• Description: 8PSK/QPSK low-power 3.3-V dual wide-band satellite tuner IC
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Introduction
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Introduction
The STV6120 dual tuner has four identical wideband RF inputs. The switch matrix 4:2
allows the selection of the appropriate RF input for each down-conversion path. After the
matrix, there is a high-frequency low-pass filter followed by two down mixers. Each mixer,
which down-converts the signal to baseband, is followed by a low-pass filter and amplifying
stages. The baseband gain can be varied by programming a register through the I
The local oscillator signals are provided by two integrated fractional-N PLLs. Each PLL
contains an on-chip voltage controlled oscillator, which meets stringent phase noise
requirements. The PLL loop filters are partially integrated. The local oscillator frequencies
are programmable between 250 and 2150 MHz.
The comparison frequency for the phase-frequency detector is generated by dividing the
crystal oscillator reference frequency. The crystal frequency will be in the range 16 MHz
to 30 MHz depending on the application.
The design of the STV6120 has been carefully implemented to avoid the problems
associated with having two tuners integrated on a single chip.
Features
Quad tuner inputs
4:2 switch matrix
Single flexible Xtal
Fine-grained power management
Wide input frequency range
Intrinsic performance
Fractional-N PLL
Doc ID 022527 Rev 1
Benefits
Fits universal quad and Quattro LNB requirements
or if fewer inputs are used, very high isolation
Low-cost, high-performance BoM integration
allowing flexibility between legacy systems and
SCR (unicable) systems
Wide choice of crystal frequencies with robust
clock buffer to drive second tuners and
demodulators allowing eBoM savings
Allows power savings and settings optimized for
actual use conditions
Allows flexible and novel frequency planning and in
some cases BoM cost optimization
Excellent compromise between linearity and noise
figure allowing the most difficult signals to be
extracted in the most congested and noisy
conditions
Low phase noise for low packet error rate under
extreme conditions (e.g., low symbol rates), fast
locking
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STV6120
C bus.