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Quickfilter Technologies, Inc. has announced a reference design to allow a single QF1D512 SavFIRe programmable digital filter IC to be configured to provide the complete digital filtering for a two-way audio crossover network. According to the company, the solution allows designers to achieve the high-quality filtering that is generally seen only in high-end audio systems with a digital filter device that costs less than one-third the cost of an equivalent DSP previously used to perform these functions.
In the two-way audio crossover network configuration, the QF1D512 SavFIRe chip enables 100 dB of attenuation in the stop band and better than 24 dB/octave attenuation in the transition band based on 48-kHz sampling and a 1,500-Hz crossover. The combined response is perfectly flat over the entire frequency band.
The configuration can be applied to both wired and wireless audio systems including wireless speakers, devices that plug into iPods and audio systems for stereo networks. (See the crossover application block diagram and the QF1D512 functional block diagram.)
The QF1D512 can be programmed using the Quickfilter Design Software to support virtually any FIR digital filter configuration. It is designed to be seamlessly inserted between an existing ADC and the host controller, or connected as a co-processor device for controllers with embedded ADCs.
The device is packaged in a 3x3-mm QFN package, and is characterized over the industrial temperature range. A development kit is also available.
Product literature (PDFs):
• Crossover product brief
• QF1D512 datasheet
• QF1D512 product brief
• QF1D512 SavFIRe development kit datasheet
• QF1D512 SavFIRe Development Kit User's Guide
Quickfilter Technologies, 214-547-0460, www.quickfiltertech.com
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