The U4090B is a monolithic integrated circuit from Atmel designed for remote control applications. It is a single-chip solution that integrates a phase-locked loop (PLL) frequency synthesizer, an oscillator, a modulator, and other necessary functions for generating infrared (IR) remote control signals. This chip is specifically tailored for use in TV, VCR, and other consumer electronic devices.

Applications

• Infrared remote control transmitters for televisions
• Infrared remote control transmitters for VCRs and DVD players
• Infrared remote control transmitters for audio equipment
• General-purpose infrared remote control systems
• Wireless control systems requiring IR communication

Features

• Single-chip infrared remote control transmitter
• Integrated PLL frequency synthesizer
• On-chip oscillator
• Modulator for generating IR signals
• Low power consumption
• Few external components required

Benefits

• Reduced component count and board space
• Simplified remote control design
• Lower system cost
• Improved reliability
• Extended battery life due to low power consumption

Additional Details

The U4090B typically operates with a crystal oscillator to generate a stable carrier frequency. The PLL ensures accurate frequency control. The modulator converts digital data into an infrared signal by modulating the carrier frequency. The output signal is then used to drive an IR LED, which transmits the signal to the receiving device. The specific modulation scheme and data format are determined by the application requirements and can be configured using external components. The U4090B is designed for compatibility with various remote control protocols. It is commonly used in high-volume consumer electronics applications due to its cost-effectiveness and ease of use.