SL2410 System Logic Semiconductor, SL2410 Datasheet - Page 5

• Manufacturer Part Number: SL2410
• Description: Tone Ringer
• Manufacturer: System Logic Semiconductor

The application circuit illustrates the use of the SL2410 devices in typical telephone or extension tone ringer
application.
The AC ringer signal voltage appears across the TIP and RING inputs of the circuit and is attenuated by
capacitor C
C
After full wave rectification by the bridge diode, the waveform is filtered by capacitor C
for the tone ringer chip.
As this voltage exceeds the initiation voltage (V
With the components shown, the ouptut frequency chops between 512(f
The loudspeaker load is coupled through a 1300
The output coupling capacitor C
When driving a piezo-ceramic transducer type load, the coupling C
However, a current limiting resistor is required.
The low frequency oscillator oscillates at a rate (f
The frequency can be determined using the relation f
controlled by an external resistor (R
f
TRIGGERING SL2410 FROM CMOS OR TTL LOGIC
H1
1
SLS
=1/1.504R
also provides isolation from DC voltages (48V) on the exchange line.
System Logic
Semiconductor
1
3
and resistor R
xC
3
, f
H2
=1/1.203R
Figure 3
1
.
3
xC
5
3
is required with transformer coupled loads.
.
3
) and capacitor (C
APPLICATION NOTE
SI
L
), oscillation starts.
) controlled by an external resistor (R
to 8
L
=1/1.289R
3
). The frequency can be determined using the relation
ransformer.
2
xC
5
2
. The high frequency oscillates at a f
and transformer (1300 :8 ) are not required.
h1
) and 640Hz(f
Figure 4
4
2
h2
) and capacitor (C
to provide a DC supply
) at a 10Hz(f
SL2410
L
) rate.
H1
2
, f
).
H2