GENERAL DESCRIPTION
The TDA8745 is the successor of the TDA8740 and TDA8741. The device contains the functionality of the TDA8740 and TDA8741 together with a synthesizer, mixer and I2C-bus control.
The pin numbers mentioned in this publication refer to the SDIP42 package; unless otherwise indicated.

FEATURES
• On-chip frequency synthesizer and mixer:
– tuning range 4 to 9.77 MHz
– reference oscillator 4 MHz (using a crystal or 4 MHz frequency source)
• IF input switches allowing selection of various IF bandwidths (wide or narrow)
• Demodulation of two audio signals by wide band Phase-Locked Loops (PLLs)
• Audio level control after PLL (modulation depth setting)
• Noise Reduction (NR) bypass for use with main audio signals
• Left, right and mono output [1⁄2(l + r)] on SCART level
• External audio inputs (for decoder connection)
• Selectable de-emphasis (DEEM) 50 µs, 75 µs, J17 and flat response
• I2C-bus control of all functions
• Two selectable addresses
• Carrier presence detector with automatic mute option.

APPLICATIONS
• Satellite receivers
• TV sets
• Video recorders.