TDA7718B

TDA7718B 3 band car audio processor Datasheet - production data Treble nd 2 order frequency response (10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz) Center frequency programmable in 4 steps * 3*36 (10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz) TSSOP28 -15 dB to 15 dB with 1 dB resolution Speaker Features 4 independent soft-step speaker controls +15 dB to -79 dB with 1 dB steps Input multiplexer Direct mute QD1: quasi-differential stereo inputs Subwoofer SE1: stereo single-ended input nd 2 order low pass filter with programmable SE2: stereo single-ended input cut off frequency (55 Hz / 85 Hz / 120 Hz / SE3: stereo single-ended input 160 Hz) FD full-differential or quasi-differential input 2 independent soft-step level control, Loudness +15 dB to 79 dB with 1 dB steps nd 2 order frequency response Mute functions Programmable center frequency Direct mute (400 Hz / 800 Hz / 2400 Hz) Digitally controlled soft-mute with 4 15dB with 1dB steps programmable mute-times Selectable high frequency boost (0.48 ms/0.96 ms/8 ms/16 ms) Selectable flat-mode (constant attenuation) Offset detection Volume Offset voltage detection circuit for on-board +23 dB to -31 dB with 1 dB step resolution power amplifier failure diagnosis Soft-step control with programmable blend times Description Bass nd The TDA7718B is a high performance signal 2 order frequency response processor specifically designed for car radio Center frequency programmable in 4 steps applications. The device includes a high (60 Hz / 80 Hz / 100 Hz / 200 Hz) performance audioprocessor with fully integrated Q programmable 1.0/1.25/1.5/2.0 audio filters and new soft-step architecture. The DC gain programmable digital control allows programming in a wide range -15 dB to 15 dB range with 1 dB resolution of filter characteristics. Middle Table 1. Device summary nd 2 order frequency response Order code Package Packing Center frequency programmable in 4 steps (500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz) TDA7718B TSSOP28 Tube Q programmable 0.75/1.0/1.25 TDA7718BTR TSSOP28 Tape and reel -15 dB to 15 dB range with 1 dB resolution September 2013 DocID18305 Rev 3 1/40 This is information on a product in full production. www.st.com 1Contents TDA7718B 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 or quasi-differential stereo input (FD/QD2) 13 4.2 Loudness . 14 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 Soft-mute . 16 4.4 Soft-step volume . 17 4.5 Bass . 17 4.5.1 Bass attenuation 17 4.5.2 Bass center frequency 18 4.5.3 Quality factors 18 4.5.4 DC mode 19 4.6 Middle 19 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 DocID18305 Rev 3