MAX2105
Description
The MAX2102/MAX2105† are low-cost direct-conversion tuner ICs designed for use in digital direct-broadcast satellite (DBS) television set-top box units. The direct-conversion architecture reduces system cost pared to devices with IF-based architectures. The MAX2102/MAX2105 directly tune L-band signals to baseband using a broadband I/Q downconverter. Operating frequency range spans from at least 950MHz to 2150MHz. The ICs include a low-noise amplifier (LNA) with automatic gain control (AGC), two downconverter mixers, an oscillator buffer with 90° quadrature generator and prescaler, and baseband amplifiers. The MAX2102 features an AGC range of 50d B, allowing input power levels as low as -69d Bm. The MAX2105 has a reduced AGC range of 41d B and accepts input power levels down to -60d Bm. The reduced AGC range of the MAX2105 allows the use of a high-gain external LNA to achieve a lower system noise figure (NF).
MAX2102/MAX2105
________________________Applications
DBS Tuners...
