TAS3002_14 Datasheet, PDF (45/55 Pages) Texas Instruments – Digital Audio Processor With Codec

8.4 ADC Digital Filter
T_A = 25°C, AV_DD = 3.3 V, DV_DD = 3.3 V, f_S = 48 kHz, 20-bit I²S mode
All terms characterized by frequency are scaled with the chosen sampling frequency, f_S. See Figure 8−1 through
Figure 8−4 for performance curves of the ADC digital filter.
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
ADC decimation filter (LPF) Pass band
0.0
20.0
kHz
Pass band ripple
±0.01
dB
Stop band
24.1
kHz
Stop band attenuation
80
dB
Group delay
720
µs
ADC high-pass filter (HPF) Pass band (−3 dB)
0.87
Hz
Deviation from linear phase
20 Hz to 20 kHz
1.23
degrees
50
0
−50
−100
−150
−200
0
0
2 fs
4 fs
6 fs
8 fs
10 fs
f − Frequency − Hz
Figure 8−1. ADC Digital Filter Characteristics
12 fs
−20
−40
−60
−80
−100
0
0.2 fs
0.4 fs
0.6 fs
0.8 fs
1 fs
f − Frequency − Hz
Figure 8−2. ADC Digital Filter Stop-Band Characteristics
8−2