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AD28MSP02 Datasheet(PDF) 2 Page - Analog Devices

Part No. AD28MSP02
Description  Voiceband Signal Port
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD28MSP02 Datasheet(HTML) 2 Page - Analog Devices

 
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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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