Datasheet

0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
FrequencyNormalizedtof
S
Magnitude – dB
ADCChannelResponseforDecimationFilter A
(RedLineCorrespondsto –73dB)
TLV320AIC3100
SLAS667A –NOVEMBER 2009–REVISED MAY 2012 www.ti.com
5.4.4.4.1 Decimation Filter A
This filter is intended for use at sampling rates up to 48 kHz. When configuring this filter, the oversampling
ratio of the ADC can either be 128 or 64. For highest performance, the oversampling ratio must be set
to 128.
Filter A can also be used for 96 kHz at an AOSR of 64.
Table 5-21. ADC Decimation-Filter-A Specifications
Parameter Condition Value (Typical) Unit
AOSR = 128
Filter gain pass band 0…0.39 f
S
0.062 dB
Filter gain stop band 0.55…64 f
S
–73 dB
Filter group delay 17/f
S
s
Pass-band ripple, 8 ksps 0…0.39 f
S
0.062 dB
Pass-band ripple, 44.1 ksps 0…0.39 f
S
0.05 dB
Pass-band ripple, 48 ksps 0…0.39 f
S
0.05 dB
AOSR = 64
Filter gain pass band 0…0.39 f
S
0.062 dB
Filter gain stop band 0.55…32 f
S
–73 dB
Filter group delay 17/f
S
s
Pass-band ripple, 8 ksps 0…0.39 f
S
0.062 dB
Pass-band ripple, 44.1 ksps 0…0.39 f
S
0.05 dB
Pass-band ripple, 48 ksps 0…0.39 f
S
0.05 dB
Pass-band ripple, 96 ksps 0…20 kHz 0.1 dB
Figure 5-13. ADC Decimation-Filter-A Frequency Response
38 APPLICATION INFORMATION Copyright © 2009–2012, Texas Instruments Incorporated
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