Overview
The LA7674 improves upon the black-level, horizontal jitter, switch-on drift performance of the single-chip LA7672 used to date. Also a single-chip IC, the LA7674 is for color TVs based on the NTSC (National Television System Committee) system with an on-chip circuit for all VIF, SIF, video, chroma and deflection signal processing.

Functions and Features
[VIF]
• PLL detection (high video and audio quality)
• High-gain VIF amplifier
• High speed AGC
• On-chip APC time constant switch

[SIF]
• Simultaneous sound IN/OUT
• Video/audio simultaneous muting, or audio-only muting
   possible
  
[Audio-visual switch]
• Internal/external audio-visual switch (VCC = 9V)

[OSD]
• RGB 3 input
• RGB linear amplifier (– 6dB input: 2V to 5V)
• Fast blanking (B input combined use)

[Chroma]
• On-chip ACC filter, On-chip killer filter, Killer-circuit
   hysteresis operation
• On-chip carrier filter

[Video]
• Black enhancement
• DC playback
• On-chip delay line
• Wide band width (9MHz): delay line short
• Dual rank on-chip differentiation circuit also available
   for soft also
• S input supported (VCR application)
• Variable DC transmission volume available (externally
   attached circuit adjustment)

[Deflection]
• Adjustment-free horizontal, vertical synchronization
• Dual AFC system with excellent anti-noise
   characteristics
• External adjustment of vertical synchronization
   sensitivity
• Vertical size is constant with no-signal
• Highly stable image during playback of copy protected
   tapes (macro-vision tape etc.)
• High stability against VCR skew distortion