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
PCM5100, PCM5101, PCM5102
www.ti.com SLAS764B –MAY 2011–REVISED SEPTEMBER 2012
Function Descriptions
Interpolation Filter
The PCM510x provides 2 types of interpolation filter. Users can select which filter to use by using the FLT pin
(pin11)
Table 8. 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 in 256 cycles in 1 sample time (t
S
) for sample
rates from 8kHz to 384kHz.
Table 9. 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 16. Normal x8 Interpolation Filter Frequency Figure 17. Normal x8 Interpolation Filter Impulse
Response Response
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