MAX2105

19-1256; Rev 2; 10/98 NUAL KIT MA ATION U EET L H A S V E S DATA W O L L FO Direct-Conversion Tuner ICs for Digital DBS Applications ____________________________Features o Low-Cost Bipolar Design, Lowest Cost Architecture o Operate from a Single +5V Supply o 950MHz to 2150MHz Input Frequency Range* o On-Chip Quadrature Generator, Dual-Modulus Prescaler (/64, /65) o Input Levels -69dBm to -19dBm per Carrier (MAX2102) -60dBm to -19dBm per Carrier (MAX2105) o Over 50dB AGC Control Range (MAX2102) o Noise Figure = 13.2dB (MAX2102); IP3 = 6.5dBm (at 1450MHz) o Automatic Baseband Offset Correction o Easy Interface to MAX1002/MAX1003 Dual ADC and Popular Baseband ICs General 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 compared 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 50dB, allowing input power levels as low as -69dBm. The MAX2105 has a reduced AGC range of 41dB and accepts input power levels down to -60dBm. The reduced ...