w91030b Winbond Electronics Corp America, w91030b Datasheet - Page 8

• Manufacturer Part Number: w91030b
• Description: Calling Line Identifier
• Manufacturer: Winbond Electronics Corp America

capacitor charging from V
capacitor will charge rapidly via a charge switch after ALGO returns low. To obtain unequal present
and absent guard times, a diode can be connected as shown in Figure 7-6, to give the unequal
resistance required during capacitor charging and discharging.
Discharge
Charge
Switch
Dual tone detected
Switch
Tip/Ring
ALGR
ALGRC
ALGO
Figure 7-5. Guard Time Waveform of ALGR, ALGRC and ALGO pins
Figure 7-4. Guard Time Circuit of Dual Tone Alert Signal Detection
DD
to V
ON
t
SS
Comparator
DP
(the ALGRC pin charges from V
Charge/Discharge
t
Control Circuit
W91030B
REC
Capacitor
t
GP
+
-
V
CPth
Alerting Signal
V
CPth
- 8 -
ON
Discharge
Preliminary W91030B
Charge
Switch
Switch
t
DA
t
DD
ABS
V
t
ALGR
ALGO
ALGRC
VDD
GA
CPth
to V
ON
SS
through a resistor). The
VDD
R
C