Silan
Semiconductors
TONE MODE ELECTRICAL CHARACTERISTICS
(Tamb=25°C, fosc=3.5795MHz,unless otherwise specified)
SC9302 Series
Test Conditions
V
DD
--
2.5V
--
2.5V
2.5V
2.5V
--
Parameter
DTMF Output DC Level
DTMF Sink Current
DTMF Output AC Level
DTMF Output Load
Column Pre-emphasis
Tone Signal Distortion
Minimum Tone Duration
Symbol
V
TDC
I
TOL
V
TAC
R
L
A
CR
THD
T
TMIN
Condition
--
V
DTMF
=0.5V
Row group, R
L
=5kΩ
THD
≤
-23dB
Row group = 0dB
R
L
=5kΩ
Auto-redial
Others
9302G
Min
0.45V
DD
0.1
0.12
5
1
--
--
--
--
--
Typ
--
--
0.155
--
2
-30
82.5
100
85.5
106
Max
0.7V
DD
--
0.18
--
3
-23
--
--
--
--
Unit
V
mA
Vrms
kΩ
dB
dB
ms
Minimum Inter-tone Pause
T
ITPM
--
Auto-redial
Others
9302G
ms
2
2
2
2
THD (Distortion)(dB)=20log
( V
1
+ V
2
+ ... + V
n
/ V
i2
+ V
h
)
Vi, Vh: Row group and column group signals
V
1
,V
2
, …Vn: Harmonic signals (BW=300Hz~3500Hz)
APPROXIMATE INTERNAL CONNECTION CIRCUITS
CMOS IN/OUT
V
DD
NMOS OUT
CMOS IN
CMOS OUT
V
DD
CMOS IN
Pull-High
V
DD
CMOS IN
Pull-Low
OSCILLATOR
X1
10M
20pF
10pF
EN
X2
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.0
2001-11-01
8
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
