Datasheet

0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
Magnitude – dB
FrequencyNormalizedtof
S
ADCChannelResponseforDecimationFilter A
(RedLineCorrespondsto –44dB)
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)
TLV320AIC3120
www.ti.com SLAS653A –FEBRUARY 2010–REVISED MAY 2012
Figure 5-13. ADC Decimation Filter A, Frequency Response
5.5.4.4.2 Decimation Filter B
Filter B is intended to support sampling rates up to 96 kHz at an oversampling ratio of 64.
Table 5-17. ADC Decimation Filter B, Specifications
Parameter Condition Value (Typical) Unit
AOSR = 64
Filter-gain pass band 0…0.39 f
S
±0.077 dB
Filter-gain stop band 0.6 f
S
…32 f
S
–46 dB
Filter group delay 11/f
S
s
Pass-band ripple, 8 ksps 0…0.39 f
S
0.076 dB
Pass-band ripple, 44.1 ksps 0…0.39 f
S
0.06 dB
Pass-band ripple, 48 ksps 0…0.39 f
S
0.06 dB
Pass-band ripple, 96 ksps 0…20 kHz 0.11 dB
Figure 5-14. ADC Decimation Filter B, Frequency Response
Copyright © 2010–2012, Texas Instruments Incorporated APPLICATION INFORMATION 35
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