Zero-IF Tuner
Maxim introduces the MAX2117 zero-IF (ZIF) tuner for UHF-band MMDS applications. This device receives QPSK signals in the 470MHz to 1000MHz range and downconverts them to baseband for demodulation. Specifically designed for China's UHF-band MMDS systems, the MAX2117 is compatible with most DVB-S demodulators. A 8dB (typ) noise figure, combined with a better than 25dB (typ) adjacent-channel protection ratio (ACPR), makes this device ideal for MMDS applications. The MAX2117 operates from a single, 3.3V ±5% supply and consumes 330mW. Though it has been designed to operate with a 4MHz crystal, an internal reference divider allows the user to select any crystal in the 4MHz to 8MHz range. Fully specified over the 0°C to +70°C commercial temperature range, the MAX2117 is available in a 5mm x 5mm, 28-pin TQFN package. Prices start at $5.00 (1000-up, FOB USA). An evaluation kit is available.