Complete, Direct-Conversion Tuner for DVB-S2 Applications
3.3V Satellite Tuner Provides DVB-S2 Performance at Only 330mW
DescriptionThe 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.
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 front-end solution. The tuner is available in a very small 28-pin thin QFN package.
- 925MHz to 2175MHz Frequency Range
- Monolithic VCO
- Low Phase Noise: -97dBc/Hz at 10kHz
- No Calibration Required
- High Dynamic Range: -75dBm to 0dBm
- Integrated Variable BW LP Filters: 4MHz to 40MHz
- Single +3.3V ±5% Supply
- Low-Power Standby Mode
- Address Pin for Multituner Applications
- Differential I/Q Interface
- I²C 2-Wire Serial Interface
- Very Small 28-Pin TQFN Package
- DirecTV and Dish Network DBS
|Part Number||Applications||Input Frequency|
|IF Output Frequency|
|Ref. Clock Freq.|
(mm x mm)
|MAX2112||DVB-S2||925 to 2175||40||12 to 30||8||3.13 to 3.47||100||5.0 x 5.0|
MAX2112EVKIT: Evaluation Kit for the MAX2112
Technical DocumentsApp Note 6448 Tuner Configuration for Faster Lock Time
Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|