An AM/FM receiver IC designed for car radio receivers with digital baseband, enables improved digitalisation in the intermediate frequency (IF) section, which helps manufacturers to simplify car radio production. The T4260 receiver IC from Atmel is the first such product on the market that is in high-volume production.
The T4260, manufactured in BiCMOS II technology, is an advanced AM/ FM receiver single-chip solution with integrated fast PLL (phase-locked loop). The device offers a fast tuning concept, based on Atmel patents, that allows locking times of less than 1 ms for a jump over the FM band with a step width of 12,5 kHz in FM mode and 1 kHz in AM mode. An automatic tuner alignment is provided by built-in digital-to-analog converters for gain and offset compensation. The RF AGC (automatic gain control) is programmable in 1 dB steps, the IF-AGC in 2 dB steps. The current consumption for this specific solution is very low (less than 80 mA) which helps engineers to design end products with reduced power consumption and also helps to keep the power dissipation in the tuner in an acceptable range.
The main benefit of the T4260 is its dedicated IF part that allows easy digitalisation. Where conventional solutions provide digital data handling only in the baseband part, the T4260 enables digital procedures already in the IF section. The low-impedance driver at the IF output is designed to allow direct input into the ADC.
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