HT9170B(1999) 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT9170B
(Rev.:1999)

DTMF Receiver

Holtek Semiconductor 

HT9170

V DD

H T 9170 VDD

S e r ie s

C

R T /G T

R

EST

(a) Fundamental circuit:

tGTP = R ´ C ´ Ln (VDD / (VDD - VTRT))

tGTA = R ´ C ´ Ln (VDD / VTRT)

H T 9170 VDD

S e r ie s

R T /G T

EST

V DD

C

R1

D1 R2

V DD

H T 9170 VDD

S e r ie s

R T /G T

EST

C

R1

D1 R2

(c) tGTP > tGTA :

tGTP = R1 ´ C ´ Ln (VDD / (VDD - VTRT))

tGTA = (R1 // R2) ´ C ´ Ln (VDD / VTRT)

(b) tGTP < tGTA :

tGTP = (R1 // R2) ´ C ´ Ln (VDD - VTRT))

tGTA = R1 ´ C ´ Ln (VDD / VTRT)

Figure 5. Steering time adjustment circuits

DTMF dialing matrix

C O L1 C O L2 C O L3 C O L4

ROW 1 1

2

3

A

ROW 2 4

5

6

B

ROW 3 7

8

9

C

ROW 4 *

0

#

D

9

December 20, 1999

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