TDA7021 radio receiver circuit

The TDA7021T is a integrated radio receiver circuit for portable radio ( stereo or mono ) and is fully compatible for applications using the low-voltage micro tuning system (MTS).
The TDA7021T radio receiver circuit has a frequency locked loop (FLL) system with an intermediate frequency of 76 kHz. The selectivity is obtained by active RC filters. The only function to be tuned is the resonant frequency of the oscillator.
Because of the low intermediate frequency, low pass filtering of the MUX signal is required to avoid noise when receiving stereo. 50 kHz roll-off compensation is needed because of the low pass characteristic of the FLL.

For mono application this amplifier can be used to directly drive an earphone. The field-strength detector enables field-strength dependent channel separation control.
With a combination of a low voltage PLL stereo decoder ( TDA7040T ) and a low voltage mono/stereo power amplifier (TDA7050T) we can build a simple portable radio .
The TDA7040T is a monolithic integrated circuit for low cost FM portable radio with an absolute minimum of peripheral components .
For this receiver circuit we need a 5V dc power supply .