TDA7021T

General description

The TDA7021T integrated radio receiver circuit is for portable radios, stereo as well as mono, where a minimum of periphery is important in terms of small dimensions and low cost. It is fully compatible for applications using the low-voltage micro tuning system (MTS). The IC 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. Interstation noise as well as noise from receiving weak signals is reduced by a correlation mute system.

Special precautions have been taken to meet local oscillator radiation requirements. 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, needed because of the low pass characteristic of the FLL, is performed by the integrated LF amplifier. For mono application this amplifier can be used to directly drive an earphone. The field-strength detector enables field-strength dependent channel separation control.

Features

• RF input stage
• Mixer
• Local oscillator
• IF amplifier/limiter
• Frequency detector
• Mute circuit
• MTS compatible
• Loop amplifier
• Internal reference circuit
• LF amplifier for
  - mono earphone amplifier or
  - MUX filter
• Field-strength dependent channel separation control facility

Products/packages

Pricing/ordering/availability

Block diagrams/pinning

Parametrics/similar products

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TDA7021T links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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