Electronic Design

Digital Radio Tuner Provides ±2dB Accuracy

All the components necessary to implement a complete digital radio tuner are included in the integrated MAX2172 device. The tuner for FM and digital audio broadcast (DAB) signals has a high sensitivity for the FM, VHF, and L-band frequency ranges. The device integrates LNAs, mixers, an IF filter, and a fully synthesized local oscillator. A front-end tracking filter eliminates interference between the UHF, VHF, and FM bands. In addition, an on-chip received-signal-strength indicator (RSSI) and temperature sensor ensure fast, accurate scan and seek functions. The RSSI provides ±2dB accuracy and outputs the measured level in digital form through the I2C bus. FM sensitivity is -111dBm (typical), and FM adjacent-channel performance meets ETSI EN 55020. Drawing 61 mA (typical) from a single 3-V supply, the MAX2172 strikes a balance between performance and power consumption, making it ideal for consumer and automotive applications. The MAX2172 utilizes a standard 2.048-MHz IF frequency that is compatible with most DAB digital demodulators. The device is packaged in a lead-free, 6-mm x 6-mm, 40-pin TQFN, and is fully specified over the -40°C to +85°C temperature range. Pricing starts at $4.00 in 1000-piece quantities. An evaluation kit is available. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.



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