SL1452

The SL1452 FM demodulator has a simple application with very low external component count. This is demonstrated by the applications circuit diagram Fig. 4, but as with most integrated circuits, particularly those working at high frequencies, some attention to good RF layout techniques and correct component selection will ensure optimum results.

A good layout can usually be ensured by the simple precaution of keeping all components close to the SL1452, maintaining short lead lengths and ensuring a good low impedance ground plane. Double sided board layout enables these objectives to be easily met, but is not essential for satisfactory operation. All coupling and decoupling capacitors of SL1452 should be chosen for low impedance characteristics at high frequencies, multilayer ceramic types usually providing small size and adequate high frequency performance. For the quadrature coil tuning capacitor a fairly stable component SL1452 should be selected to prevent excessive drift. The power supply decoupling capacitor from pin 6 to ground should be 0.1mF minimum but the input coupling and decoupling values can be smaller, about 330pF being adequate.