STV6120 8PSK/QPSK low-power 3.3-V dual wide-band satellite tuner IC Data brief Features Low power consumption Compatible with 5- and 3.3-V I2C bus Four VLNA inputs On-chip 4:2 matrix Applications Input frequency range 250 MHz to 2150 MHz Two independently programmable tuners Direct broadcasting satellite (DBS) QPSK/8PSK demodulation RF to baseband direct conversion Set-top box 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) Package VFQFPN-56 8 x 8 x 1 mm3 with exposed pad down (EPD) for heat dissipation ECOPACK(R), environmentally friendly package Description The STV6120 satellite tuner is a quad-input dual direct-conversion (zero-IF) wideband satellite tuner intended for digital set-top boxes and similar applications. PLL1 +dividers1 RFAin DC offset compensation 1 QP1 QN1 RFBin RFCin IN1 IP1 VLNA + Matrix 4:2 QP2 QN2 RFDin IN2 IP2 AGC1 AGC2 XTAL_IN XTAL_INN XTAL_OUT November 2011 PLL2 + dividers2 DC offset compensation 2 SCL I2C Bus Interface XTAL Amplifier SDA Doc ID 022527 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Introduction 1 STV6120 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 I2C 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 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. 2/4 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 between 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 Doc ID 022527 Rev 1 STV6120 2 Ordering information Ordering information Table 1. Device summary Order code 3 Temperature range Package Packaging STV6120B -10 to 70 C VFQFPM-56 EPD Tray STV6120BT -10 to 70 C VFQFPM-56 EPD Tape and Reel Revision history Table 2. Document revision history Date Revision 29-Nov-2011 1 Changes Initial release. Doc ID 022527 Rev 1 3/4 STV6120 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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