DM300024 Microchip Technology, DM300024 Datasheet - Page 45

• Manufacturer Part Number: DM300024
• Description: KIT DEMO DSPICDEM 1.1
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM300024

• Contents: Board, Cable, CD, Power Supply
• Silicon Manufacturer: Microchip
• Core Architecture: DsPIC
• Core Sub-architecture: DsPIC30F
• Features: Serial Communication Channels Interface, General Purpose Prototyping Area
• Silicon Core Number: DsPIC30F, DsPIC33F
• Silicon Family Name: DsPIC30F6xxx, DsPIC33FJxxGPxxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: dsPIC30F/33F and PIC24H
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

© 2006 Microchip Technology Inc.
dsPIC30F Demonstration Program Operation
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
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
DS70099D-page 41