Description
The U4488B is an integrated bipolar circuit for full multistandard sound IF signal processing in TV/VTR and Multimedia applications.
Features
- D 5-V supply voltage; low power consumption D Gain-controlled 3-stage wideband IF amplifier D Active carrier generation by FPLL principle
(frequency-phase-locked-loop) for true quadrature demodulation
D Complete alignment-free AM demodulator D Switchable amplitude detector for gain control, which
operates as a peak detector for FM sound and as a mean level detector for AM sound
D Two symmetrical IF inputs
Block Diagram
IF1/IF2 S3 11 1 2 IF-Amp 12 Intercarrier (FM) 4 14 REF FPLL VS Loop filter.
U4488B Datasheet
