adsp-bf527c Analog Devices, Inc., adsp-bf527c Datasheet - Page 39

• Manufacturer Part Number: adsp-bf527c
• Description: Blackfin Embedded Processor
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
DIGITAL FILTER CHARACTERISTICS
Stop Band Attenuation (dB) is the degree to which the fre-
quency spectrum is attenuated (outside audio band)
Pass-band Ripple is any variation of the frequency response in
the pass-band region
Table 38. Digital Filter Characteristics
Table 39. ADC/DAC Digital Filters Group Delay
ADC HIGH PASS FILTER
The CODEC has a selectable digital high pass filter to remove dc
offsets. The filter response is characterized by the following
polynomial.
H z ( )
Parameter
ADC Filter
DAC Filter
0
1
2
3
Passband
Passband
Passband Ripple
Stopband
Stopband Attenuation
High Pass Filter Corner Frequency –3 dB
High Pass Filter Corner Frequency –0.5 dB
High Pass Filter Corner Frequency –0.1 dB
Passband
Passband
Passband Ripple
Stopband
Stopband Attenuation
Mode
=
(
1 z
–
DAC Filters
11÷ f
18 ÷ f
5 ÷ f
5 ÷ f
1 –
)
⁄
S
S
S
(
S
1 0.9995 z
–
×
Group Delay
1 –
±0.05 dB
–6 dB
f > 0.5465 × f
±0.03 dB
–6 dB
f > 0.5465 × f
Conditions
)
ADC Filters
12 ÷ f
20 ÷ f
3 ÷ f
6 ÷ f
S
S
S
S
S
S
Rev. PrC | Page 39 of 44 | June 2008
ADSP-BF523C/ADSP-BF525C/ADSP-BF527C
The ADC and DAC employ different digital filters. There are
four types of digital filter, called Type 0, 1, 2 and 3. The perfor-
mance of Types 0 and 1 is listed in
filters is shown in the proceeding pages.
Min
tbd × f
tbd × f
tbd
tbd × f
tbd × f
tbd
Table
S
S
S
S
38, the responses of all
Typical Max
0.5 × f
3.7
10.4
21.6
0.5 × f
S
S
tbd × f
tbd
tbd × f
tbd
S
S
Unit
dB
dB
Hz
Hz
Hz
dB
dB