DM300014 Microchip Technology, DM300014 Datasheet - Page 43

• Manufacturer Part Number: DM300014
• Description: BOARD DEMO DSPICDEM 1.1 GEN PURP
• Manufacturer: Microchip Technology

Specifications of DM300014

• Processor To Be Evaluated: PIC30F
• Data Bus Width: 16 bit
• Interface Type: RS-485, CAN, SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

 2003 Microchip Technology Inc.
TABLE 3-5:
The filter coefficients and code were generated by the Digital Filter Design Tool.
3.5.2
The following overall CPU performance metric is calculated on how many complete
processing cycles can be performed over a 1-second interval.
• FFT Computation:
• IIR Filter Computation:
• CPU Idle:
The 26 multiplier used in the above computations is based upon how many times in one
second 256 samples can be acquired and then processed by the IIR and FFT
algorithms.
For example:
• 32 mS for acquisition of 256 samples
• 3.89 mS for IIR filtering
• 2.47 mS for 256-point FFT
IIR filter specifications are listed in Table 3-6.
TABLE 3-6:
The filter coefficients and code were generated by the Digital Filter Design Tool.
FIR filter type
Passband ripple
Stopband ripple
Passband cutoff frequencies
Stopband cutoff frequencies
Sampling frequency
IIR filter type
Passband ripple
Stopband ripple
Passband cutoff frequencies
Stopband cutoff frequencies
Sampling frequency
- 26 x 256-point complex FFTs = 64.2 mS
- 26 x 9 second-order elliptic section IIR filters = 101 mS
- Waiting for ADC data = 834 mS
Adding these three major timing metrics results in 38.3 mS. Therefore, this
38.3 mS cycle is repeated approximately 26 times in a 1 second interval.
Total MIPS required = 1.22 MIPS out of available 7.3728 MIPS.
Coefficients stored in program memory
Specification
Specification
Performance Metric Summary with IIR Filter
FIR FILTER SPECIFICATIONS
IIR FILTER SPECIFICATIONS
Demonstration Program Operation
Advance Information
BandPass
Kaiser Window - 273 coefficients
0.001 dB
100 dB
300 Hz and 3800 Hz
100 Hz and 3990 Hz
8000 Hz
Bandpass, Elliptic, 9 Second Order Sections
0.001 dB
100 dB
200 Hz and 3850 Hz
100 Hz and 3990 Hz
8000 Hz
Value
Value
DS70099B-page 39