Overview
The LA7565B/M is a PAL/NTSC multi-system audio VIF/SIF signal-processing IC that adopts a minimal adjustment technique. The VIF circuit adopts a minimal adjustment technique in which AFT adjustment is made unnecessary by VCO adjustment to simply end product adjustment. The FM detector circuit uses PLL detections to support multi-system audio detection. Since the  LA7565BM include an SIF converter on chip, it is easy to implement multi-system audio. In addition, it also includes a buzz canceller that suppresses Nyquist buzz to achieve improved audio quality.

FEATUREs
• Allows the use of a switch circuit to switch between spilt and intercarrier operation.
• Improved buzz and buzz beat characteristics provided by a PLL detector plus buzz canceller system.
• The IF AGC second filter is built in.
• PAL/NTSC multi-system audio can be implemented easily.
• Adjustment-free circuit design that does not require AFT and SIF coils.