Document
TONE RINGER
S1T2410B01/B02
INTRODUCTION
The S1T2410B01/B02 is a bipolar integrated circuit designed as a telephone bell replacement.
8−DIP−300
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/B02
TONE RINGER
PIN CONFIGURATION
VCC VCONT LFI LFO
1 2 3 4
8 7 6 5
OUTPUT HFI HFO GND
S1T2410B01/ S1T2410B02
ABSOLUTE MAXIMUM RATINGS
Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD TOPR TSTG Value 30 400 − 45 to +65 −65 to +150 Unit V mW °C °C
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TONE RINGER
S1T2410B01/B02
ELECTRICAL CHARACTERISTICS (Ta = 25°C)
(All voltage referenced to GND unless otherwise specified) Characteristic Operating Voltage Initiation Voltage1 Initiation Current1 Sustaining Voltage2 Sustaining Current2 Trigger Voltage3 Trigger Current3 Disable Voltage4 Disable Current4 Output Voltage High Output Voltage Low Input Current 1 (Pin 3) Input Current 2 (Pin 7) High Frequency 1 High Frequency 2 Low Frequency Symbol VCC VSI ISI VSUS ISUS VTRG ITRG VDIS IDIS VOH VOL II (PIN 3) II (PIN 7) fH1 fH2 fL See Fig. 1 S1T2410B02 -6.8K-Pin 2 to GND See Fig. 1 No Load VCC = VSUS, See Fig. 1 S1T2410B01 Only VCC = 15V S1T2410B01 Only S1T2410B01 Only S1T2410B01 Only VCC = 21V, I8 = −15mA Pin 6 = 6V, Pin 7 = GND VCC = 21V, I8 = 15mA Pin 6 = GND, Pin 7 = 6V Pin 3 = 6V, Pin 4 = GND Pin 7 = 6V, Pin 6 = GND R3 = 191K, C3 = 6800pF R3 = 191K, C3 = 6800pF R2 = 165K, C2 = 0.47µF − − 461 576 9.0 − − 512 640 10 500 500 563 704 11.0 nA nA Hz Hz Hz − − 1.6 V Test Conditions − Min. − 17 1.4 9.7 0.7 9.0 10.0 − −40 17.0 Typ. − 19 2.5 11.0 1.4 10.5 20.0 − −50 19.0 Max. 29.0 21 4.2 12.0 2.5 12.0 10005 0.8 − 21.0 Unit V V mA V mA V µA V µA V
NOTES: (see electrical characteristics sheet) 1. Initial supply voltage (VSI) is the supply voltage required to start tone ringer oscillation 2. Sustaining voltage (VSUS) is the supply voltage required to maintain oscillation. 3. VTR and ITR are the conditions applied to trigger to start oscillation for VSUS ≤ VCC ≤ VSI 4. VDIS and lDIS are the conditions applied to trigger to inhibit oscillation for VSI ≤ VCC 5. Trigger current must be limited to this value externally.
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S1T2410B01/B02
TONE RINGER
CHARACTERISTIC CURVE
S1T2410B01 Supply Current (No Load) Vs. Supply Voltage
VCC (V), Supply Voltage
Figure 1.
S1T2410B02 Supply Current (No Load) Vs. Supply Voltage
VCC (V), Supply Voltage Figure 2.
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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 1300Ω to 8Ω transformer. The output coupling capacitor C5 with transformer coupled loads is required. When driving a piezo-ceramic transducer type load, the coupling C5 and transformer (1300Ω :8 Ω) 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 dropp.