UPD63210GT 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD63210GT

16-BIT D/A CONVERTER WITH BUILT-IN DIGITAL FILTER FOR AUDIO

NEC => Renesas Technology 

µPD63210, 63210L

3.3 Digital Filter

The 8-times oversampling FIR digital filter is used to attenuate the image out of band noise component, thus

facilitating the analog filter designing.

The configuration of the digital filter is shown in Figure 3-5. The characteristics of the digital filter are shown

in Figures 3-6 and 3-7.

Figure 3-5. Configuration of Digital Filter

(Input)

fs

1st 127th FIR filter

2fs

2nd 23rd FIR filter

4fs

3rd 11th FIR filter

8fs

(Output)

Figure 3-6. Frequency Characteristics of Digital Filter

0

–40

–80

–120

0

1

2

3

4

5

6

7

8

Frequency (fS)

Figure 3-7. Intraband Ripple Characteristics of Digital Filter

0.005

0

–0.005

0 0.0625 0.125 0.1875 0.25 0.3125 0.375 0.4375 0.5

Frequency (fS)

10

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