Overview
The LA3550M Auto-Loudness Controller IC provides user selectable boosting of up to approximately 24dB for low frequency sound components in the range of 30 to 50Hz. Boosting gain for low frequencies can be controlled in proportion to the level of an external input signal. High frequencies are also boosted by a fixed 6dB. The result gives natural and dynamic boosting at all sound levels, and realistic audio reproduction.

Features
• User-selectable low-frequency boost levels from 5.5 to 23.5dB (max).
• 6dB (fixed) high-frequency boosting.
• Low-frequency boost gain level control circuit on-chip.
• Output signal detection circuit on-chip.
• Boost select/deselect switching.
• Built-in AGC circuit prevents clipping.
• Reduced noise levels.
• Reduced parts’ count.
• Low-power operation.
• 14-pin MFP package (1mm pitch pins).