−120

−100

−80

−60

−40

−20

0

0

1

2

3

4

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

G023

PCM5100A, PCM5101A, PCM5102A

www.ti.com

SLAS859 – MAY 2012

Function Descriptions

Interpolation Filter

The PCM510xA 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

from 8kHz to 384kHz.

Table 9. Normal x8 Interpolation Filter

Parameter

Condition

Value (Typ)

Value (Max)

Units

Filter Gain Pass Band

±0.02

dB

Filter Gain Stop Band

–60

dB

Filter Group Delay

s

space

Figure 17. Normal x8 Interpolation Filter Frequency

Figure 18. Normal x8 Interpolation Filter Impulse

Response

Response

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Product Folder Link(s): PCM5100A PCM5101A PCM5102A