Overview
The LA9511W is a transmitter IC developed for free space infrared transmission of stereo audio and video signals. It integrates all the required functions for transmission, including audio signal modulation, video signal modulation, LED drive, and other functions on a single chip. An AV coupler system can be implemented easily using this IC and a receiver IC (such as the LA9520V).

Functions
[Audio Block]
• Audio input block ALC with wide AGC operating range
• Integration of passive components used for preemphasis and time constants onto the chip.
• Deviation adjustment amplifier. Adjustable from an externally applied voltage: supports an electronic variable resistor function.
• Filter: Removes unneeded high-frequency components.
• Audio VCO. PLL circuit adopted for adjustment-free operation.

[Video Block]
• Video deviation amplifier. Adjustable from an externally applied voltage: supports an electronic variable resistor function.
• Video preemphasis
• Video VCO. f0 adjustment from an externally applied voltage: supports an electronic variable resistor function.
• Filter. Removes unneeded high-frequency components.

[Driver Block]
• Mixer and driver amplifier. Features excellent highfrequency characteristics and allows addition of external data (remote control).