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SB3229-E1-T Datasheet(PDF) 7 Page - ON Semiconductor |
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SB3229-E1-T Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 17 page RHYTHM SB3229 www.onsemi.com 7 TYPICAL APPLICATIONS (continued) Figure 4. Typical Trimmer Application Circuit Note: All resistors in ohms and all capacitors in farads, unless otherwise stated. TONE GENERATOR VB 22 47 μ VC TR1 TR2 TR3 TR4 MS A/D A/D TRIMMER/VC INTERFACE PROGRAMMING INTERFACE REGULATOR D/A HBRIDGE SB3229 PRE BIQUAD FILTERS 1−4 + AGC−O POST BIQUAD FILTERS 1 & 2 POST BIQUAD FILTERS 3 & 4 CROSS FADER 1 22 20 19 18 17 15 14 16 12 11 8 7 6 5 4 3 2 13 NOISE GENERATOR EVOKE 1, 2 or 4 CHANNEL WDRC BIQUAD 1−4 Reed Switch For Autotcoil MIC / TELECOIL COMPENSATION FEEDBACK CANCELLER PEAK CLIPPING VC GAIN WIDEBAND GAIN 910 21 SB3229 OVERVIEW SB3229 is a DSP system implemented on ON Semiconductor’s Wolverine t hardware platform. Wolverine is the hearing industry’s first 90 nm Silicon−on−Chip platform enabling design of highly−efficient and flexible hearing aid solutions. The device is packaged for easy integration into a wide range of applications from CIC to BTE. SB3229 can be used as a programmable or trimmer adjustable device. It may be configured as one, two or four channels with linear or WDRC processing. Configuration data stored in non−volatile memory defines hearing−aid parameters. SB3229 can be programmed via the SDA or I2C programming interfaces. The DSP core implements Adaptive Feedback Cancellation, compression, wideband gain, and volume control. The Adaptive Feedback Canceller reduces acoustic feedback while offering robust performance against pure tones. During trimmer mode operation, a low−speed A/D circuit monitors the positions of up to four manual trimmers and a VC potentiometer. Trimmer position changes are immediately interpreted and translated into new circuit parameter values, which are then used to update the signal path. FUNCTIONAL BLOCK DESCRIPTION A/D and D/A Converter The system’s A/D converter is a 2nd−order sigma−delta modulator operating at a 2.048 MHz sample rate. The system’s input is pre−conditioned with anti−alias filtering and a programmable gain pre−amplifier. The analog output is oversampled and modulated to produce a 1−bit pulse density modulated (PDM) data stream. The digital PDM data is then decimated down to pulse−code modulated (PCM) digital words at the system’s sampling rate of 32 kHz. The D/A is comprised of a digital 3rd−order sigma−delta modulator and an H−bridge. The modulator accepts PCM audio data from the DSP path and converts it into a 64−times oversampled, 1−bit PDM data stream, which is then supplied to the H−bridge. The H−bridge is a specialized CMOS output driver used to convert the 1−bit data stream into a low−impedance, differential output voltage waveform suitable for driving zero−biased hearing aid receivers. |
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Descripción similar - SB3229-E1-T |
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