GENERAL DESCRIPTION

The SAA7740H is a function-specific digital signal processor. The device is capable of performing processing for listening-environments such as equalization, hall-effects, reverberation, surround-sound and digital volume/balance control. The SAA7740H can also be reconfigured (in a dual and quad filter mode) so that it can be used as a digital filter with programmable characteristics.

FEATURES

Hardware

• Two digital inputs and two digital outputs in the I2S-bus format (i.e. 4 audio channels)

• Independent input/output interfaces

• Slave input/output interfaces

• Slave processing

• I2C-bus microcontroller interface

• DC filtering at the inputs

• One programmable 2nd-order digital filter unit

• Two multiply accumulate processor units (24 × 16-bit/MAC)

• DRAM interface and address computation unit for external delay lines

• On-chip coefficient and external delay line address storage

• Hardware controlled soft mute via the MUTE pin

• Hardware controlled soft demute via the RST pin

• Operating ambient temperature; −40 to +85 °C.

Software

• 5-band parametric equalizer with selectable centre frequency, slope setting and boost/cut gain settings from −12 to +12 dB

• Stereo width control from mono to stereo to spatial stereo

• Stereo Hall-effects for field acoustics, such as concert halls, with 8 coefficients and 8 delayed taps per channel

• External delay line processing for delays up to 1 second

• Reverberation with selectable reverberation time (up to 5 seconds) and energy

• Three different surround sound programs to obtain a spatial effect on 4 loudspeakers

• Passive DOLBY surround processing with the addition of an external dynamic noise reduction IC

• Karaoke processing

• Dual 16th-order correction filtering

• Quad 8th-order correction filtering

• Digital volume and balance control

• Soft controlled soft mute/demute via the microcontroller interface

• Input switching matrix

• Output rear and front switching matrix.

APPLICATIONS

• Digital amplifiers

• Audio combination sets

• Car audio systems

• TV audio channels.