The MAX2112 is a low-cost, direct-conversion tuner IC 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).
The MAX2112 is a low-cost, direct-conversion tuner IC designed for satellite set-top and VSAT applications, supporting 8PSK and Digital Video Broadcast (DVB-S2) standards. It directly converts satellite signals from the LNB to baseband using a broadband I/Q downconverter, eliminating the need for an external LNA due to its low noise figure.
The device includes an LNA, RF variable-gain amplifier, I and Q downconverting mixers, and baseband lowpass filters with programmable cutoff frequency control. Configuration is accomplished via a 2-wire serial interface, and the IC features a VCO autoselect function and a low-power standby mode.
| Operating Frequency Range | 925MHz to 2175MHz |
|---|---|
| Supply Voltage | Single +3.3V ±5% |
| Package Type | 28-Pin Thin QFN |
| Interface | I2C 2-Wire Serial |
The IC is intended for 8PSK and Digital Video Broadcast (DVB-S2) applications.
No, the low noise figure eliminates the need for an external LNA.
The MAX2112ETI+ version operates from -40°C to +85°C.