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HT9170 Datasheet(PDF) 9 Page - Holtek Semiconductor Inc

Part # HT9170
Description  DTMF Receiver
PDF  12 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9170 Datasheet(HTML) 9 Page - Holtek Semiconductor Inc

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Figure 5. Steering time adjustment circuits
HT9170
9
December 20, 1999
DTMF dialing matrix
1
4
7
*
2
5
8
0
3
6
9
#
A
B
C
D
RO W 1
RO W 2
RO W 3
RO W 4
C O L1 C O L2 C O L3 C O L4
R
C
VD D
RT / G T
ES T
V DD
H T 9170
Se r i e s
(a) Fundamental circuit:
tGTP =R ´ C ´ Ln (VDD /(VDD - VTRT))
tGTA =R ´ C ´ Ln (VDD /VTRT)
R1
C
VD D
RT / G T
ES T
R2
D1
V DD
H T 9170
Se r i e s
(b) tGTP <tGTA :
tGTP = (R1 // R2) ´ C ´ Ln (VDD - VTRT))
tGTA =R1 ´ C ´ Ln (VDD /VTRT)
R1
C
VD D
RT / G T
ES T
R2
D1
V DD
H T 9170
Se r i e s
(c) tGTP >tGTA :
tGTP =R1 ´ C ´ Ln (VDD /(VDD - VTRT))
tGTA = (R1 // R2) ´ C ´ Ln (VDD /VTRT)



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