Description The STV6412A is a highly integrated I²C bus-controlled audio and video switch matrix, optimized for use in digital set-top box applications. It provides all the audio and video routings required in a full two SCART set-top box design. Features ■ I²C bus control ■ Standby mode with interrupt signal output ■ Video section – 4 CVBS inputs, 3 CVBS outputs (one with selectable chroma trap filter) – 3 Y/C inputs, 2 Y/C outputs – 6 dB gain on all CVBS/Y and C outputs – Integrated 150 Ω buffers – 1 Y/C adder – 2 RGB/FB inputs, 1 tri-state RGB/FB output with 6 dB adjustable gain (from +3dB to +9dB) – Video muting on all outputs – 2 slow blanking inputs/outputs – Sync bottom clamp on all CVBS/Y and RGB inputs, average clamp on C Inputs – Bandwidth: 15 MHz – Crosstalk: 50 dB minimum ■ Audio Section – 4 stereo inputs, 3 stereo outputs – 1 mono-sound output – stereo-to-mono sound capability – 0/6/9 dB selectable gain on one stereo input – Full range volume control with soft control – Audio muting on all outputs
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