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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SB3230 датащи(PDF) 7 Page - ON Semiconductor |
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SB3230 датащи(HTML) 7 Page - ON Semiconductor |
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7 / 17 page  RHYTHM SB3230 www.onsemi.com 7 SB3230 OVERVIEW SB3230 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. SB3230 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. SB3230 can be programmed via the SDA or I2C programming interfaces. The DSP core implements Adaptive Feedback Cancellation, Adaptive Noise Reduction, 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. Analog Inputs SB3230 provides for up to four analog inputs, Microphone 1 (MIC1), Microphone 2 (MIC2), Telecoil (TCOIL) and Direct Audio Input (DAI) with the following configurable front end modes: • 1 Mic Omni • 1 Mic Omni (Rear channel only) • DAI • TCOIL • 1 Mic Omni + TCOIL • 1 Mic Omni + DAI Attenuation can be applied to the input when mixing with either TCOIL or DAI inputs. Channel Processing Figure 5 represents the I/O characteristic of independent AGC channel processing. The I/O curve can be divided into four main regions: • Low input level expansion (squelch) region • Low input level linear region • Compression region • High input level linear region (return to linear) Figure 5. Independent Channel I/O Curve Flexibility −100 −90 −80 −70 −60 −50 −40 −30 −20 −10 0 −120 −110 −100 −90 −80 −70 −60 −50 −40 −30 −20 INPUT LEVEL (dBV) Low Level Gain Compression Ratio High Level Gain Squelch Threshold Lower Threshold Upper Threshold Channel I/O processing is specified by the Squelch threshold (SQUELCHTH) and any four of the following five parameters (only four of the five properties are independent): • Low level gain (LLGAIN) • Lower threshold (LTH) • High level gain (HLGAIN) • Upper threshold (UTH) • Compression ratio (CR) During the Parameter Map creation, constraints are applied to the compression parameters to ensure that the I/O characteristics are continuous. Parameter adjustments support two popular styles of compression ratio adjustment: • The compression region of the I/O curve pivots about the upper threshold. As the compression ratio trimmer is adjusted, high−level gain remains constant while the low−level gain changes. |
Аналогичный номер детали - SB3230 |
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Аналогичное описание - SB3230 |
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