GENERAL DESCRIPTION
The TDA9840 is a stereo/dual sound processor for TV and VTR sets. Its identification ensures safe operation by using internal digital PLL technique with extremely small bandwidth, synchronous detection and digital integration (switching time maximum 2.3 s; identification concerning the main functions).

FEATURES
• Supply voltage 5 to 8 V
• De-emphasis
• Source selector
• Level and stereo matrix adjustment possible via the I2C-bus
• I2C-bus transceiver
• AF inputs for NICAM or AM sound (standard L)
• AF outputs for Main and SCART
• AF input and output signals selectable via the I2C-bus
• Information for identified transmission mode is readable via I2C-bus
• Software is compatible with the TDA8415/16/17
• Quartz oscillator and clock generator
• Three digital PLL, alignment-free
• Two digital integrators, alignment-free
• Stabilizer circuit for ripple rejection and constant output signals
• ESD protection of all pins.