Features
 Input multiplexer
– QD1: quasi-differential stereo input
– QD2: quasi-differential stereo input
– SE1: stereo single-ended input
– SE2: stereo single-ended input
– SE3: stereo single-ended input
 Loudness
– 2nd order frequency response
– Programmable center frequency
(400 Hz / 800 Hz / 2400 Hz)
– 15 dB with 1 dB steps
– Selectable high frequency boost
– Selectable flat-mode (constant attenuation)
 Volume
– +23 dB to -63 dB with 1 dB step resolution
– Soft-step control with programmable blend
times
 Bass
– 2nd order frequency response
– Center frequency programmable in 4 steps
(60 Hz / 80 Hz / 100 Hz / 200 Hz)
– Q programmable 1.0/1.25/1.5/2.0
– DC gain programmable
– -15 to 15 dB range with 1 dB resolution
 Middle
– 2nd order frequency response
– Center frequency programmable in 4 steps
(500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz)
– Q programmable 0.75/1.0/1.25
– -15 to 15 dB range with 1 dB resolution
 Treble
– 2nd order frequency response
– Center frequency programmable in 4 steps
(10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz)
– -15 to 15 dB range with 1 dB resolution
 High-pass
– 2nd order frequency response
– Center frequency programmable in 3 steps
(100 Hz / 120 Hz / 150 Hz)
 Subwoofer
– 2nd order low pass filter
– Programmable cut off frequency
– (55 Hz / 85 Hz / 120 Hz / 160 Hz)
– 2 independent soft-step level control,
+15 dB to -79 dB with 1 dB steps
 Speaker
– 6 independent soft-step speaker controls
– +15 dB to -79 dB with 1 dB steps
– Two selectable output DC level
– Direct mute
 Mute functions
– Direct mute
– Digitally controlled soft-mute with 4
programmable mute-times
– (0.48 ms / 0.96 ms / 8 ms / 16 ms)
 Offset detection
– Offset voltage detection circuit for on-board
power amplifier failure diagnosis

Description
The TDA7720B is a high performance signal
processor specifically designed for car radio
applications. The device includes a high
performance audio processor with fully integrated
audio filters and new soft-step architecture. The
digital control allows programming in a wide range
of filter characteristics.