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Fixed point DSP hardware has lower dynamic range and precision than floating point devices. But it is preferred for some applications (notably, data compression is often better done by a fixed point DSP processor), and some fixed point devices (such as the Motorola DSP56301) may be faster than floating point devices. Fixed point processors are also cheaper, so are often preferred when designing a custom system which will be produced in some quantity. Our fixed point DSP products use the Analog Devices ADSP2181 16 bit processor which calculates at 33 MIPS (millions of instructions per second), and the Motorola DSP56002 and DSP56301 24 bit processors, which calculate at 33 MIPS and 66 MIPS respectively. The extended dynamic range and precision of the 24 bit processors means they are often preferred for applications such as high quality audio - whereas the 16 bit processor is cheaper and often used for speech or telecommunications applications.
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