TDA7718N

TDA7718N 3 band car audio processor Features Input multiplexer QD1: quasi-differential stereo inputs SE1: stereo single-ended input SE2: stereo single-ended input TSSOP28 SE3: stereo single-ended input FD1 / SE4+SE5: 1 full-differential input or 2 Speaker stereo single-ended inputs 4 independent soft step speaker controls Loudness nd +15 dB to -79 dB with 1 dB steps 2 order frequency response Direct mute Programmable center frequency (400 Hz / 800 Hz / 2400 Hz) Subwoofer nd 15dB with 1dB steps 2 order low pass filter with programmable cut off frequency Selectable high frequency boost (55 Hz / 85 Hz / 120 Hz / 160 Hz) Selectable flat-mode (constant attenuation) 2 independent soft step level control, Volume +15 dB to 79 dB with 1 dB steps +23 dB to -31 dB with 1 dB step resolution Mute functions Soft-step control with programmable blend Direct mute times Digitally controlled SoftMute with 4 Bass programmable mute-times nd 2 order frequency response (0.48 ms/0.96 ms/8 ms/16 ms) Center frequency programmable in 4 steps Offset detection (60 Hz / 80 Hz / 100 Hz / 200 Hz) Offset voltage detection circuit for on-board Q programmable 1.0/1.25/1.5/2.0 power amplifier failure diagnosis DC gain programmable -15 dB to 15 dB range with 1 dB resolution Description Middle nd 2 order frequency response The TDA7718N is a high performance signal processor specifically designed for car radio Center frequency programmable in 4 steps (500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz) applications. The device includes a high performance audioprocessor with fully integrated Q programmable 0.75/1.0/1.25 audio filters and new Soft Step architecture. The -15 dB to 15 dB range with 1 dB resolution digital control allows programming in a wide range Treble of filter characteristics. nd 2 order frequency response (10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz) Table 1. Device summary Center frequency programmable in 4 steps (10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz) Order code Package Packing -15 dB to 15 dB with 1 dB resolution TDA7718N TSSOP28 Tube TDA7718NTR TSSOP28 Tape and reel September 2013 Doc ID 16502 Rev 2 1/40 www.st.com 1Contents TDA7718N Contents 1 Block circuit diagram 6 2 Pin connection and pin description 7 2.1 Pin connection 7 2.2 Pin description 7 3 Electrical specifications 9 3.1 Thermal data . 9 3.2 Absolute maximum ratings . 9 3.3 Electrical characteristics . 9 4 Description of the audioprocessor 13 4.1 Input stages . 13 4.1.1 Quasi-differential stereo input (QD1) . 13 4.1.2 Single-ended stereo input (SE1, SE2, SE3) . 13 4.1.3 Full-differential stereo input or single-ended input (FD1/QD2/SE4+SE5) 13 4.2 Loudness . 15 4.2.1 Loudness attenuation 15 4.2.2 Peak frequency . 15 4.2.3 High frequency boost . 16 4.2.4 Flat mode 16 4.3 SoftMute 17 4.4 SoftStep volume 17 4.5 Bass . 18 4.5.1 Bass attenuation 18 4.5.2 Bass center frequency 18 4.5.3 Quality factors 19 4.5.4 DC mode 19 4.6 Middle 20 4.6.1 Middle attenuation . 20 4.6.2 Middle center frequency 20 4.6.3 Quality factors 21 4.7 Treble 21 2/40 Doc ID 16502 Rev 2