Low Power Tuner IC Meets ATSC A/74 standards
MaxLinear announced the MxL5007T, a TV tuner IC developed for low-cost converter, set top box (STB) and other TV systems currently being designed for the FCC-mandated 2009 digital television cutover. Measuring 5 mm × 5 mm in a 32-pin QFN package, the IC features high levels of integration (including LNAs, baluns, tracking and loop filters, and integrated SAW filter functionality) and consumes 300 mW of power. The device incorporates key circuit design and radio architecture technologies that are said to enable “can” tuner equivalent performance in ATSC-to-analog converter boxes and DVB-T only STBs and PC TV applications. According to the company this IC exceeds the ATSC A/74 Receiver Performance Guidelines, including the distortion specification for rejection of unwanted signals proximate to the desired signal. The MxL5007T can receive an input signal spanning a continuous frequency band from 44 MHz to 860 MHz from a 75-ohm antenna or cable. It has an integrated low noise amplifier (LNA), on chip tracking and PLL loop filters, automatic gain control, LO generation, and channel selectivity functions for board-level design. Its flexible output intermediate frequency (IF) ranges from 4 MHz to 44 MHz to support many demodulators. An integrated on-chip loop through function makes the IC suitable for STB designs that require an additional RF out, and multi-tuner applications such as PVRs, televisions supporting picture-in-picture, and other similar functionality.