PCM5121 Datasheet, PDF (48/107 Pages) Texas Instruments – 2VRMS DirectPath™, 112/106dB Audio Stereo DAC with 32-bit, 384kHz PCM Interface

PCM5121, PCM5122
SLAS763A – AUGUST 2012 – REVISED SEPTEMBER 2012
Table 26. Low latency ×2 Interpolation Filter, Quad Rate
Parameter
Filter Gain Pass Band
Filter Gain Stop Band
Filter Group Delay
Condition
0 ……. 0.45f_S
0.55f_S ….. 1.455f_S
Value (Typical)
Value (Max)
0
1.0
Units
dB
dB
S
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−20
−40
−60
−80
−100
0.8
0.6
0.4
0.2
0.0
−0.2
−120
0
1
2
3
4
Frequency (x f_S)
G005
Figure 50. Low latency x2 Interpolation Filter
Frequency Response
−0.4
0
10 20 30 40 50 60 70 80 90 100
Samples
G016
Figure 51. Low latency x2 Interpolation Filter
Impulse Response
0.0001
0.00008
0.00006
0.00004
0.00002
0
−0.00002
−0.00004
−0.00006
−0.00008
−0.0001
0.0
0.5
1.0
Frequency (x f_S)
G030
Figure 52. Low latency x2 Interpolation Filter Passband Ripple
48
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