data brief for further information contact your local stmicroelectronics sales office. november 2011 doc id 022527 rev 1 1/4 4 STV6120 8psk/qpsk low-power 3.3-v dual wide-band satellite tuner ic features four vlna inputs on-chip 4:2 matrix input frequency range 250 mhz to 2150 mhz two independently programmable tuners rf to baseband direct conversion single 3.3-v dc supply fractional n synthesizers extremely low phase noise, compliant with dvb-s2 requirements flexible crystal frequency output to drive the demodulator ic continuously variable gain: 0 to 65 db additional and programmable gain on baseband amplifier: 0 to 16 db programmable 5- to 36-mhz cut-off frequency (butterworth 5th-order baseband filters) low power consumption compatible with 5- and 3.3-v i 2 c bus applications direct broadcasting satellite (dbs) qpsk/8psk demodulation set-top box package vfqfpn-56 8 x 8 x 1 mm 3 with exposed pad down (epd) for heat dissipation ecopack ? , environmentally friendly package description the STV6120 satellite tune r is a quad-input dual direct-conversion (zer o-if) wideban d satellite tuner intended for digital set-top boxes and similar applications. pll2 xtal rfbin qp1 i 2 c bus interface qn1 in1 ip1 agc1 scl xtal_in sda dc offset compensation 2 xtal_out xtal_inn rfcin vlna qn2 in2 ip2 dc offset compensation 1 pll1 qp2 rfdin rfain + matrix 4:2 agc2 +dividers1 + dividers2 amplifier www.st.com
introduction STV6120 2/4 doc id 022527 rev 1 1 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 2 c bus. 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 filter s are partially integrated. th e 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. th e 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 benefits quad tuner inputs fits universal quad and quattro lnb requirements or if fewer inputs are used, very high isolation 4:2 switch matrix low-cost, high-performance bom integration allowing flexibility betw een legacy systems and scr (unicable) systems single flexible xtal wide choice of crystal frequencies with robust clock buffer to drive second tuners and demodulators allowing ebom savings fine-grained power management allows power savings and settings optimized for actual use conditions wide input frequency range allows flexible and novel frequency planning and in some cases bom cost optimization intrinsic performance excellent compromise between linearity and noise figure allowing the most difficult signals to be extracted in the most congested and noisy conditions fractional-n pll low phase noise for low packet error rate under extreme conditions (e.g., low symbol rates), fast locking
STV6120 ordering information doc id 022527 rev 1 3/4 2 ordering information 3 revision history table 1. device summary order code temperature range package packaging STV6120b -10 to 70 c vfqfpm-56 epd tray STV6120bt -10 to 70 c vfqfpm-56 epd tape and reel table 2. document revision history date revision changes 29-nov-2011 1 initial release.
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