FM receiver on TDA7088T. Scheme, description

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FM receiver on TDA7088T. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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Recently, on a wide sale, you can find pocket PM receivers that work on head phones, the settings of which are controlled by just two "SCAN" and "RESET" buttons. When you press the first button, the receiver sequentially tunes in to the stations of the FM band, when you press the second button, it returns to the beginning of the range. Such receivers do not have scales.

Like all Asian products, such receivers have a variety of names, one of which is "MANBO-AS-707". Most of these devices are built on the 7088G chip - the Chinese analogue of the Philips TDA7088T chip.

(click to enlarge)

The TDA7088T chip is a further development of the "TDA7000" theme, it is built on the same principle as well-known microcircuits such as K174XA34, K174XA42, that is, the superheterodyne path operates according to a low IF circuit, about 70 kHz, and the distortions that occur in this case are eliminated by the deviation compression system.

The advantage of this method is the absence of IF circuits and piezo filters, since the role of the FSS is performed by active filters on the op-amp. The disadvantage, as with K174XA34, K174XA42, is that despite the low THD, the sound quality has characteristic flaws, and it cannot be called high. The difference between the microcircuit and the above is that it contains an automatic tuning device that generates a smoothly changing tuning voltage supplied to the varicap. The APCG system monitors the tuning, and when the station enters the APCG holdband, the tuning voltage is fixed at a steady level. Further, to go to the next station, you need to press the "SCAN" button again, and to return to the beginning of the range - press "RESET". The microcircuit is made in a small-sized plastic case of the FP-16 type, with surface mounting leads.

Structural and typical switching diagram is shown in the figure in the text. Subjectively, the sound quality of the "MANBO-AS-707" receiver built on the 7088G chip is the same as the sound quality of the receiver on the K174XA34, included according to the standard circuit.

Literature

Radioconstructor 8/2001, p.11.

Publication: N. Bolshakov, rf.atnn.ru

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