Overview
The LA7583 is a VIF + SIF IC that requires no adjustments. In order to eliminate the need for adjustments in the VIF block, a multi-network PLL has been developed and adopted for video detection. In the SIF block, adjustments were eliminated by using gyrator technology in the FM quadrature detector. In addition to eliminating the need for adjustments, a buzz canceller that suppresses Nyquist buzz has been built into the LA7583 in order to provide excellent sound quality.

Features
• Elimination of VCO, AFT, and SIF coils eliminates the need for adjustments.
• A variety of built-in filters.
• Built-in buzz canceller results in excellent audio characteristics.

Functions
[VIF]
• VIF amplifier • Multinetwork PLL • BNC • FAGC
• Equalizer amplifier • AFT • IFAGC • Buzz canceller
• AGC lag lead filter • Video driver
[1st SIF]
•Preamplifier • 1st SIF detector • AGC detector • Built-in AGC filter
[SIF]
• Limiter amplifier • AQT detector (gyrator) • J/U switch
[mute]
• Audio mute • AV mute