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MAX2112ETI

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仕様・特性

EVALUATION KIT AVAILABLE MAX2112 Complete, Direct-Conversion Tuner for DVB-S2 Applications General Description Features The MAX2112 low-cost, direct-conversion tuner IC is designed for satellite set-top and VSAT applications. The IC is intended for 8PSK and Digital Video Broadcast (DVB-S2) applications. The MAX2112 directly converts the satellite signals from the LNB to baseband using a broadband I/Q downconverter. The operating frequency range extends from 925MHz to 2175MHz. The device includes an LNA and an RF variable-gain amplifier, I and Q downconverting mixers, and baseband lowpass filters with programmable cutoff frequency control and digitally controlled baseband variable-gain amplifiers. Together, the RF and baseband variable-gain amplifiers provide more than 80dB of gain control range. The IC is compatible with virtually all DVB-S2 demodulators. The MAX2112 includes fully monolithic VCOs, as well as a complete fractional-N frequency synthesizer. Additionally, an on-chip crystal oscillator is provided along with a buffered output for driving additional tuners and demodulators. Synthesizer programming and device configuration are accomplished with a 2-wire serial interface. The IC features a VCO autoselect (VAS) function that automatically selects the proper VCO. For multituner applications, the device can be configured to have one of two 2-wire interface addresses. A low-power standby mode is available whereupon the signal path is shut down while leaving the reference oscillator, digital interface, and buffer circuits active, providing a method to reduce power in single and multituner applications. Functional Diagrams The MAX2112 is the most advanced DBS tuner available today. The low noise figure eliminates the need for an external LNA. A small number of passive components are needed to form a complete DVB-S2 RF frontend solution. The tuner is available in a very small 28-pin thin QFN package. o 925MHz to 2175MHz Frequency Range o Monolithic VCO Low Phase Noise: -97dBc/Hz at 10kHz No Calibration Required o High Dynamic Range: -75dBm to 0dBm o Integrated Variable BW LP Filters: 4MHz to 40MHz o Single +3.3V ±5% Supply o Low-Power Standby Mode o Address Pin for Multituner Applications o Differential I/Q Interface o I2C 2-Wire Serial Interface o Very Small 28-Pin TQFN Package Ordering Information TEMP RANGE PIN-PACKAGE MAX2112CTI+ PART 0°C to +70°C 28 Thin QFN-EP* MAX2112ETI+ -40°C to +85°C 28 Thin QFN-EP* *EP = Exposed paddle. +Denotes a lead(Pb)-free/RoHS-compliant package. ADDR VCC_RF2 SDA VCC_BB QDC- QDC+ IDC- + SCL Pin Configuration/ Functional Diagram 28 27 26 25 24 23 22 1 21 LPF BW CONTROL IDC+ 20 DC OFFSET CORRECTION MAX2112 INTERFACE LOGIC AND CONTROL IOUT- DirecTV and Dish Network DBS 2 GND 3 19 IOUT+ RFIN 4 18 QOUT- GC1 Applications VCC_RF1 5 17 QOUT+ 16 VCC_DIG 15 REFOUT DVB-S2 FREQUENCY SYNTHESIZER DIV2/DIV4 7 8 9 10 11 12 13 GNDTUNE GNDSYN CPOUT VCC_SYN EP VTUNE VCC_VCO Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. 6 VCOBYP VCC_LO For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 14 XTAL VSATs 19-0869; Rev 2; 5/10

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