Datasheet

−120
−100
−80
−60
−40
−20
0
0 1 2 3 4
Frequency (x f
S
)
Amplitude (dB)
G012
−0.4
−0.2
0.0
0.2
0.4
0.6
0.8
1.0
0 50 100 150 200 250 300 350 400
Samples
Amplitude (FFS)
G023
PCM5100A , PCM5101A , PCM5102A
PCM5100A-Q1 , PCM5101A-Q1 , PCM5102A-Q1
www.ti.com SLAS859C –MAY 2012–REVISED MAY 2015
9.3.4 Audio Processing
9.3.4.1 Interpolation Filter
The PCM510xA provides two types of interpolation filter. Users can select which filter to use by using the FLT pin
(pin 11).
Table 3. Digital Interpolation Filter Options
FLT Pin Description
0 FIR normal x8/x4/x2/x1 interpolation filters
1 IIR low-latency x8/x4/x2/x1 interpolation filters
The normal x8 / x4 / x2 / x1(bypass) interpolation filter is programmed for sample rates from 8 kHz to 384 kHz.
Table 4. Normal x8 Interpolation Filter
Parameter Condition Value (Typ) Value (Max) Units
Filter gain pass band 0 ……. 0.45f
S
±0.02 dB
Filter gain stop band 0.55f
S
….. 7.455f
S
–60 dB
Filter group delay 22t
S
s
Figure 15. Normal x8 Interpolation Filter Frequency Figure 16. Normal x8 Interpolation Filter Impulse
Response Response
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