TDA7721TR

5 band car audio processor

The TDA7721 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 SoftStep architecture. The digital control allows programming in a wide range of filter characteristics.

**Key Features**

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Input multiplexer

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QD1 to QD2: quasi-differential stereo input

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SE1 to SE3: stereo single-ended input

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InGain

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6 dB with 1 dB steps

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Loudness

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2nd order frequency response

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Programmable center frequency 400 Hz / 800 Hz / 2400 Hz

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15 dB with 1 dB steps

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Selectable high frequency boost

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Selectable flat-mode constant attenuation

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Volume

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+23 dB to -79 dB with 1 dB step resolution

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SoftStep control with programmable blend times

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EQ1

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2nd order frequency response

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Center frequency programmable in 4 steps 63 Hz / 80 Hz/ 100 Hz /125 Hz

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Q programmable in 4 steps 1.0/1.25/1.5/2.0

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-15 to 15 dB range with 1 dB resolution

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EQ2

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2nd order frequency response

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Center frequency programmable in 4 steps 200 Hz/ 250 Hz/ 315 Hz/ 400 Hz

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Q programmable in 4 steps 1.0/1.25/1.5/2.0

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-15 to 15 dB range with 1 dB resolution

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EQ3

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2nd order frequency response

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Center frequency programmable in 4 steps 630 Hz/ 800 Hz/ 1 kHz/ 1.25 kHz

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Q programmable in 4 steps 0.75/1.0/1.25/2

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-15 to 15 dB range with 1 dB resolution

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EQ4

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2nd order frequency response

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Center frequency programmable in 4 steps 2 kHz/ 2.5 kHz/ 3.15 kHz/ 4 kHz

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Q programmable in 4 steps 0.75/1.0/1.25/2

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-15 to 15 dB range with 1 dB resolution

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EQ5

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2nd order frequency response

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Center frequency programmable in 4 steps 6.3 kHz/ 8 kHz / 10 kHz/ 12.5 kHz

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Q programmable in 4 steps 0.75/1.0/1.25/2

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-15 to 15 dB range with 1 dB resolution

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Highpass

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2nd order frequency response

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Center frequency programmable in 5 steps 63 Hz / 100 Hz / 120 Hz / 150 Hz/ 180 Hz

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Subwoofer

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2nd order low pass filter

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Programmable cut off frequency

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55 Hz / 85 Hz / 120 Hz / 160 Hz

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Speaker

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6 independent soft step speaker controls

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+15 dB to -79 dB with 1 dB steps

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Three selectable output DC level

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Direct mute

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Mute functions

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Direct mute

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Digitally controlled SoftMute with 4 programmable mute-times

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0.48 ms / 0.96 ms / 8 ms / 16 ms

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Offset detection

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Offset voltage detection circuit for on-board power amplifier failure diagnosis