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2 / 20 page AD28msp02 REV. 0 –2– OUTPUT DIFFERENTIAL AMP CONTROL REGISTER VOLTAGE REFERENCE 1 16 16 INPUT AMP ANALOG SIGMA-DELTA MODULATOR 1.0 MHz ANTI-ALIASING DECIMATION FILTER DIGITAL HIGH-PASS FILTER 8.0 kHz 8.0 kHz 16-BIT SIGMA-DELTA ADC VFB NORM VINNORM 16 8.0 kHz SDI SDIFS SDO SDOFS SCLK DATA/ CNTRL MUX INPUT AMP VFB AUX VIN AUX +20dB AMP NORM AUX VREF VOUTP VOUTN CS 1 16 16 1.0 MHz 1.0 MHz 8.0 kHz 16-BIT SIGMA-DELTA DAC ANTI-IMAGING INTERPOLATION FILTER PGA SERIAL PORT HIGH-PASS DIGITAL FILTER ANALOG SMOOTHING FILTER DIGITAL SIGMA-DELTA MODULATOR Figure 1. AD28msp02 Block Diagram The IIR low-pass filter is a 10th-order elliptic filter with a pass- band edge at 3.7 kHz and a stopband attenuation of 65 dB at 4 kHz. This filter has the following specifications: Filter type: 10th-order low-pass elliptic IIR Sample frequency: 40.0 kHz Passband cutoff:* 3.70 kHz Passband ripple: ±0.2 dB Stopband cutoff: 4.0 kHz Stopband ripple: –65.00 dB *The passband cutoff frequency is defined to be the last point in the passband that meets the passband ripple specification. (Note that these specifications apply only to this filter, and not to the entire ADC. The specifications can be used to perform further analysis of the exact characteristics of the filter, for example using a digital filter design software package.) Figure 2 shows the frequency response of the IIR low-pass filter. 0 –100 5000 –80 2000 –40 –60 –20 4400 3800 3200 2600 FREQUENCY – Hz Figure 2. IIR Low-Pass Filter Frequency Response High-Pass Filter The digital high-pass filter removes frequency components at the low end of the spectrum; it attenuates signal energy below the passband of the converter. The high-pass filter can be bypassed by setting the ADBY bit (Bit 3) of the AD28msp02’s control register. The high-pass filter is a 4th-order elliptic filter with a passband cutoff at 150 Hz. Stopband attenuation is 25 dB. This filter has the following specifications: Filter type: 4th-order high-pass elliptic IIR Sample frequency: 8.0 kHz Passband cutoff: 150.0 Hz Passband ripple: ±0.2 dB Stopband cutoff: 100.0 Hz Stopband ripple: –25.00 dB (Note that these specifications apply only to this filter, and not to the entire ADC. The specifications can be used to perform further analysis of the exact characteristics of the filter, for example using a digital filter design software package.) Figure 3 shows the frequency response of the high-pass filter. 0 –100 300 –80 0 –40 –60 –20 240 180 120 60 FREQUENCY – Hz Figure 3. High-Pass Filter Frequency Response Passband ripple is ±0.2 dB for the combined effects of the ADC’s digital filters (i.e., high-pass filter and IIR low-pass of the decimation filter) in the 300 Hz–3400 Hz passband. The output of the ADC is transferred to the AD28msp02’s serial port (SPORT) at an 8 kHz rate, for transmission to the host DSP processor. Maximum group delay in the ADC will not exceed 1 ms in the region from 300 Hz to 3 kHz. |
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