Overview
The LA7565E and LA7565KM are PAL/NTSC multi-system 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.
• PAL/NTSC multi-system audio can be implemented easily.
• Adjustment-free circuit design that does not require AFT and SIF coils.

Functions
[VIF Block]
    • PLL detector
    • AFT
    • RF AGC
    • Buzz canceller
    • Equalizer amplifier
    • SIF converter
    • VIF amplifier
    • IF AGC
[First SIF Block]
    • First SIF detector
    • First SIF amplifier
[SIF Block]
    • PLL type FM detector
    • Limiter amplifier