Application Circuits

Echo Mode

Note: 1.

: Analog ground,

: Digital ground

2. When the value of the Rosc increases, the range of the Delay time also increases. Please refer to the

HT8972

Rev. 1.00

6

December 23, 2008

V C C

R E F

A G N D

4 7 m F

1

2

3

D G N D

O S C _ O

V C O

C C 1

4

5

6

7

C C 0

8

1 0 0 m F

0 . 1 m F

0 . 1 m F

L P F 1 _ I N

L P F 1 _ O U T

1 0 0 0 p F

1 0 k W

4 . 3 k W

1 6

1 5

4 . 7 m F

6 8 0 0 p F

4 . 3 k W

4 . 7 m F

1 0 0 k W

3 . 3 k W

1 0 m F

0 . 0 3 3 m F

O u t p u t

1 0 m F

L P F 2 _ O U T

L P F 2 _ I N

5 6 0 p F

4 . 3 k W

1 0 k W

1 4

1 3

6 8 0 0 p F

O P 2 _ O U T

O P 2 _ I N

4 . 3 k W

1 2

1 1

O P 1 _ I N

O P 1 _ O U T

1 0

9

V C C

2 0 k W

4 . 7 m F

3 9 p F

4 7 k W

2 2 m F

5 6 0 W

4

9 V

8

1

3

2

2 0 k W

V C C

4 . 7 k W

4 7 k W

4 . 7 k W

1 0 0 m F

1 k W

1 m F

4 . 7 k W

1 k W

1 m F

4 . 7 k W

M I C

4 5 5 8

4 . 7 k W

H T 8 9 7 2

0 . 1 m F

M I C V O L

2 . 7 k W

6 8 0 0 p F

6 8 0 0 p F

F e e d B a c k

1

2

E c h o M o d e

5 0 k W

2 0 k W

D e l a y T i m e