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PDF S1T2410B01-D0B0 Data sheet ( Hoja de datos )

Número de pieza S1T2410B01-D0B0
Descripción bipolar integrated circuit designed as telephone bell replacement
Fabricantes Samsung semiconductor 
Logotipo Samsung semiconductor Logotipo



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TONE RINGER
S1T2410B01/B02
INTRODUCTION
The S1T2410B01/B02 is a bipolar integrated circuit designed as a
telephone bell replacement.
8DIP300
FUNCTIONS
• Two oscillators
• Output amplifier
• Power supply control circuit
FEATURES
• Designed for telephone bell replacement
• Low drain current
• Small size MINIDIP package
• Adjustable 2-frequency tone
• Adjustable warbling rate
• Built-in hysteresis prevents false triggering and rotary dial CHIRPS’
• Extension tone ringer modules
• Alarms or other alerting devices
• External triggering or ringer disable (S1T2410B01)
• Adjustable for reduced initial supply current (S1T2410B02)
ORDERING INFORMATION
Device
S1T2410B01-D0B0
S1T2410B02-D0B0
Package
8-DIP-300
Operating Temperature
45°C to +65°C
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S1T2410B01-D0B0 pdf
TONE RINGER
S1T2410B01/B02
APPLICATION INFORMATION
The application circuit illustrates the use of the S1T2410B01/B02 devices in typical telephone or extensive tone
ringer applications.
The AC ringer signal voltage appears across the TIP and RING inputs of the circuit, and is attenuated by capacitor
C1 and resistor R1.
(C1 also provides isolation from DC voltages (48V) on the exchange line).
After full wave rectification by the bridge diode, the wave form is filtered by capacitor C4 to provide a DC supply for
the tone ringer chip.
When this voltage exceeds the initiation (VSI), oscillation starts.
With the components shown, the output frequency chops between 512 Hz (fH1) and 640Hz (fH2) at a 10Hz (fL) rate.
The loudspeaker load is coupled through a 1300to 8transformer.
The output coupling capacitor C5 with transformer coupled loads is required.
When driving a piezo-ceramic transducer type load, the coupling C5 and transformer (1300:8 ) are not required.
However, a current limiting resistor is required.
The low frequency oscillator oscillates at a rate (fL) controlled by an external resistor (R2) and capacitor (C2). The
frequency can be determined using the function fL = 1/(1.289 R2 C2). The high frequency oscillates at a fH1, fH2
controlled by an external resistor (R3) and capacitor (C3). The frequency can be determined using the function tHI
= 1/(1.504 R3 C3). Voltage remains constant independent of RSL.
Pin 2 of the S1T2410B02 allows connection of an external resistor RSL, which is used to program the slope of the
supply current vs supply voltage characteristics (see Fig. 2) and hence the supply current up to the initial voltage
(VSI). This initial voltage remains constant independent of RSL.
The supply current drawn prior to triggering is inversely proportional with RSL, decreasing for an increasing value of
resistance.
Thus, increasing the value of RSL, will decrease the amount of AC ringing current required to trigger the device.
Longer subscriber loops are possible since less voltage is dropped per unit length of loop wire due to the lower
current level. RSL can also be used to compensate for smaller AC coupling capacitors (C5 on Fig. 3) (higher
impedance) to the line which is used to alter the ringer equivalence number of a tone ringer circuit.
The graph in Fig. 2 illustrates the variation of supply current with supply voltage of the S1T2410B02. Three curves
are drawn to show the variation of the initiation current with RSL. Curve B (RSL = 6.8k) shows the I-V
characteristic for the S1T2410B02 tone ringer. Curve A is a plot with RSL < 6.8kand shows an increase in the
current drawn up to the initiation voltage VSI. After initiation, the I-V characteristic remain unchanged. Curve C
illustrates the effect of increasing RSL above 6.8kinitiation current decreases, but is unchanged after triggering.
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