TDA4445B

TDA4445A TDA4445B SOUND IF AMPLIFIER . . . . . . . . QUADRATURE INTERCARRIER DEMODULATOR VERY HIGH INPUT SENSITIVITY GOOD SIGNAL TO NOISE RATIO FAST AVERAGING AGC IF AMPLIFIER CAN BE SWITCHED OFF FOR VTR MODE GOOD AM SUPPRESSION OUTPUT SIGNAL STABILIZED AGAINST SUPPLY VOLTAGE VARIATIONS VERY FEW EXTERNAL COMPONENTS DESCRIPTION TDA4445A : Sound IF amplifier, with FM processing for quasi parallel sound system. TDA4445B : Sound IF amplifier, with FM processing and AM demodulator, for multi-standard sound TV appliances. TDA4445B additionnal : Bistandard applications (B/G and L) No adjustment of the AM demodulator Low AM distortion PIN CONNECTIONS DIP16 (Plastic Package) ORDER CODE : TDA4445A - TDA4445B IF INPUT NOT TO BE CONNECTED IF AGC TIME CONSTANT NOT TO BE CONNECTED NOT TO BE CONNE CTED FOR TDA4445A AVE RAGING CAP ACITOR FOR TDA4445B NOT TO BE CONNE CTED FOR TDA4445A A.F. SOUND OUTPUT FOR TDA4445B 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 IF INPUT NOT TO BE CONNECTED NOT TO BE CONNECTED GROUND FM MODULATED SOUND OUTPUT SUPPLY VOLTAGE NOT TO BE CONNECTED REFERENCE L.C. NETWORK 4445-01.EPS NOT TO BE CONNECTED REFERENCE L.C. NETWORK December 1992 1/6 TDA4445A - TDA4445B BLOCK DIAGRAMS TDA4445A TDA4445B GENERAL DESCRIPTION Quasi parallel sound operation : High phase accuracy of the carrier signal proc2/6 . . . . This circuit includes the following functions : Three symmetrical and gain controlled wide band amplifier stages, which are extremely stable by quasi DC co...