TDA7418 3 band car audio processor Features Input multiplexer PD/SE4: pseudo differential stereo input, programmable as single-ended input SO20 SE1: stereo single-end input SE2: stereo single-end input SE3: stereo single-end input Q programmable 0.5/0.75/1.0/1.25 Input gain adjust from 0 to 15dB with 1dB -15 to 15dB range with 1dB resolution steps Treble Internal offset-cancellation (AutoZero) Second order frequency response Loudness Center frequency programmable in 4 steps Second order frequency response (10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz) Programmable center frequency -15 to 15dB range with 1dB resolution (400 Hz / 800 Hz / 2400 Hz) Speaker 15dB with 1dB steps 4 independent soft step speaker controls, Selectable low and high frequency boost +15dB to -79dB with 1dB steps direct mute Selectable flat-mode (constant attenuation) Subwoofer Volume Single-ended mono output +15dB to -79dB with 1dB step resolution Independent soft step level control, +15dB Soft-step control with programmable blend to -79dB with 1dB steps times Mute functions Bass Direct mute Second order frequency response Digitally controlled SoftMute with 3 Center frequency programmable in 4 steps programmable mute-times (60 Hz / 80 Hz / 100 Hz / 200 Hz) (0.48 ms / 0.96 ms /123 ms) Q programmable 1.0/1.25/1.5/2.0 DC gain programmable Description -15 to 15dB range with 1dB resolution The TDA7418 includes a high performance audio Middle processor with fully integrated 3-Band filters to Second order frequency response process signals at audible frequencies. The digital control allows a full programming of the Center frequency programmable in 4 steps audioprocessor and filters characteristics. (500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz) Table 1. Device summary Order code Temp range, C Package Packing TDA7418 -40 to +85 SO20 Tube TDA7418TR -40 to +85 SO20 Tape and reel September 2013 Rev 4 1/29 www.st.com 1Contents TDA7418 Contents 1 Block diagram 6 2 Pin description . 7 2.1 Connection diagram 7 2.2 Pin list . 7 3 Electrical specification . 8 3.1 Absolute maximum ratings . 8 3.2 Electrical characteristics . 8 4 Description of the audioprocessor 12 4.1 Input stages . 12 4.2 AutoZero . 12 4.3 Loudness . 13 4.3.1 Attenuation . 13 4.3.2 Peak frequency . 13 4.3.3 Low and high frequency boost 14 4.3.4 Flat mode 14 4.4 SoftMute 14 4.5 SoftStep volume 15 4.6 Bass . 15 4.6.1 Attenuation . 15 4.6.2 Center frequency 16 4.6.3 Quality factors 16 4.6.4 DC mode 16 4.7 Middle 17 4.7.1 Attenuation . 17 4.7.2 Center frequency 17 4.7.3 Quality factors 17 4.8 Treble 18 4.8.1 Attenuation . 18 4.8.2 Center frequency 18 4.9 Speaker attenuator 18 2/29