HT8972 datasheet(5/13 Pages) HOLTEK

5 / 13 page

HT8972

Rev. 1.00

December 23, 2008

L P F 1

A / D

D e l a y

D / A

L P F 2

V I N

V O U T

Functional Description

The HT8972 is an echo/surround effect generator with

built-in 40Kb SRAM. It ensures low distortion as well as

low noise for processing audio signal delay. The chip

provides two playing modes (echo and surround) and

the playing function block diagrams are shown as fol-

lows.

· Surround mode

· Echo mode

ROSC-fOSC-Delay_time-Distortion Cross table

ROSC

56.2

36.3

30.6

25.9

23.1

20.7

fOSC

2.5

3.5

4.5

MHz

320

264

219

188

164

147

132

THD

1.3

1.05

0.815

0.625

0.58

0.525

0.43

ROSC

18.5

16.7

15.1

14.5

13.9

11.9

10.9

fOSC

5.5

6.5

7.5

8.5

MHz

120

110

102

THD

0.4

0.335

0.315

0.3

0.275

0.26

0.25

ROSC

8.06

7.3

6.4

5.8

5.3

fOSC

121314

MHz

73.2

65.6

59.2

54.4

THD

0.23

0.218

0.205

0.19

0.17

0.1675

0.1575

ROSC

4.8

4.4

3.7

3.3

2.8

fOSC

MHz

41.2

38.4

33.6

THD

0.16

0.145

0.14

0.13

0.125

0.12

L P F 1

A / D

D e l a y

D / A

L P F 2

V I N

V O U T

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