LA7565E
Overview
The LA7565E and LA7565KM are PAL/NTSC multisystem audio VIF/SIF signal-processing ICs that adopt 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. The LA7565G and LA7565KM feature improvements over the LA7565B and LA7565BM in the FM low-range frequency characteristics, vertical synchronization buzz, and AFT drift.
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.
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