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ST3917A Datasheet(PDF) 13 Page - STMicroelectronics

Part # ST3917A
Description  SPEECH - TONE/PULSE DIALER - LED INDICATOR
PDF  16 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST3917A Datasheet(HTML) 13 Page - STMicroelectronics

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C1
C2
C3
SEL
OSC
P ULSE
MODE /PT
HKS
GND
RXOUT
GRX
RXIN
I
REF
V
CC
R1
R2
R3
R4
MU/MFI
V
DD
GDTMF
MIC+
MIC-
GTX
REG
LN
ILINE
LED
ST3917A/B
12
3
45
6
78
9
*
0#
FLASH
TONE/P ULSE
PAUS E
LND
S ECRET
Col
Row
3.58MHz
V
DD
100k
Ω
P ulse
Tone
SW2
SW1
RGR X
100pF
10 F
Re
3.9k
Ω
+
100 F
+
620
Ω
100nF
RDTMF
CDTMF
470nF
1 F
1 F
RGTX
100pF
4.7 F
+
LED
V
ear
130k
Ω
3.9k
Ω
390
Ω
20
Ω
390
Ω
600
Ω
100 F
+
I
LN
V
LN
470k
Ω
GDTMF = 20 log
V
LN
V
MF
V
MF
CDTMF = 20 log
Vear
V
LN
Figure 10 : Test
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C1
C2
C3
SEL
OS C
PULS E
MODE/P T
HKS
GND
RXOUT
GR X
RXIN
I
RE F
V
CC
R1
R2
R3
R4
MU/MFI
V
DD
GDTMF
MIC+
MIC-
GTX
REG
LN
ILINE
LED
S T3917A/B
12
3
45
6
78
9
*
0#
FLAS H
TONE/P ULSE
P AUSE
LND
SECRET
Col
Row
3.58MHz
V
DD
100k
Ω
P ulse
Tone
SW2
SW1
RGRX
100pF
10 F
Re
3.9k
Ω
+
100 F
+
620
Ω
100nF
RDTMF
CDTMF
470nF
1 F
1 F
RGTX
100pF
4.7 F
+
LED
V
ear
130k
Ω
3.9k
Ω
390
Ω
20
Ω
390
Ω
100 F
+
I
LN
V
LN
470k
Ω
GRX= 20 log Vear
V
inp
V
inp
Figure 11 : Test
ST3917A - ST3917B
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