UTCTA31002A UTC | Alldatasheet

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UTC TA31002A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 1 TELEPHONE TONE RINGER

DESCRIPTION

The UTC TA31002A is a bipolar integrated circuit designed for telephone bell replacement. It can also be used as alarms or other alerting devices.

FEATURES

*Designed for telephone bell replacement. *Low current drain for multiple extension of lines. *Adjustable 2-frequency tone. *Adjustable warbling rate. *Built-in hysteresis prevents false triggering and rotary dial 'CHIRPS'. *Programmable for initiation current by simple external resistor DIP-8 PIN CONFIGURATIONS Vcc RSL Low Freq. Time Constant Low Freq. Time Costant Output High Freq. Time Constant High Freq. Time Constant GND ABSOLUTE MAXIMUM RATINGS (Ta=25 °C ) PARAMETER SYMBOL VALUE UNIT Supply Voltage Vcc 30 V Power Dissipation Pd 400 mW Operating Temperature Topr -45 to 85 °C Storage Temperature Tstg -65 to 150 °C

UTC TA31002A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 2 BLOCK DIAGRAM LOW OSC HIGH OSC AMP POWER SUPPLY (WITH HYSTERESIS) 674 5 2 OUTPUT R3R2 C3 Note:R2,R3,C2 and C3 are parts externally mounted ELECTRICAL CHARACTERISTICS ( Ta=25 °C, all voltage referenced to GND unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Operating Supply Voltage Vcc 29.0 V Initiation Supply Voltage (note 1) Vsi See Fig.2 17 19 21 V Initiation Supply Current (note 1) Isi 6.8K-Pin 2 to GND 1.4 2.8 4.2 mA Sustaining Voltage (note 2) Vsus See Fig.2 9.7 11.0 12.0 V Sustaining Current (note 2) Isus No Load Vcc=Vsus,See Fig.2 0.7 1.4 2.5 mA Output Voltage High VOH Vcc=21V, I8=-15mA Pin6=6V, Pin7=GND 17.0 19.0 21.0 V Output Voltage Low VOL Vcc=21V, I8=15mA Pin6=GND, Pin7=6V 1.6 V IIN (Pin 3) IIN (Pin 7) Pin3=6V, Pin4=GND Pin7=6V, Pin6=GND 500 500 nA nA High Frequency 1 FH1 R3=191K, C3=6800pF 461 512 563 Hz High Frequency 2 FH2 R3=191K, C3=6800pF 576 640 704 Hz Low Frequency FL R2=165K, C2=0.47 µF 9.0 10 11.0 Hz *NOTE (See electrical characteristics sheet) 1. Initiation supply voltage ( Vsi) is the supply voltage required to start the tone ringer oscillating. 2. Sustaining voltage ( Vsus ) is the supply voltage required to maintain oscillation.

UTC TA31002A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 3 APPLICATION NOTE The application circuit illustrates the use of the UTCTA31002A device in typical telephone tone ringer application. The AC ringer signal voltage appears across the TIP and RING inputs of the circuit and is attenua- ted by capacitor C1 and resistor R1. C1 also provides isolation from DC voltage (48V) on the exchanged 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. As this voltage exceeds the initiation voltage ( Vsi), oscillation starts. With the components shown , the output frequency chops between 512Hz (F H1 ) and 640 Hz(F H2 ) at a 10 Hz(F L ) rate. The loudspeaker load is coupled through a 1300 Ω to 8 Ω transformer. The output coupling capacitor C5 is required with transformer coupled loads. When driving a pizeo-ceramic transducer type load, the coupling C5 and transformer (1300 Ω :8 Ω ) are not required. However, a current limiting resistor is required. The low frequency oscillator oscillates at a rate (F L ) controlled by an external resistor (R2) and capacitor (C2). The fequency can be determined using the relation F L =1/1.289 R2* C2. The high frequency oscillates at a FH1,F H2 controlled by an external resistor (R3) and capacitor (C3). The frequency can be determined using the relation F H1 =1/1.504 R3*C3 and F H2 = 1/1.203 R3*C3. Pin 2 of the UTC TA31002A allows connection of external resistor RSL, which is used to program the slope of the supply current vs. supply voltage characteristics (see Fig.3), and hence the supply current up to the initiation voltage ( Vsi). This initiation voltage remains constant independent of RSL. The supply current drawn prior to triggering varies inversely with RSL, decreasing for increasing value of resistance. Thus, increasing the value of RSL , will decrease the amount of AC ringing current required to trigger the device. As such, longer sucribser 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 compensated for smaller AC coupling capacitors (C5 on Fig.4) (higher impedance) to the line which can be used to alter the ringer equivalence number of a tone ringer circuit. The graph in Fig.3 illustrates the variation of supply current with supply voltage of the UTC TA31002A. Three curves are drawn to show the variation of initiation current with RSL. Curve B ( RSL=6.8K) shows the I-V characteristic for UTC TA31002A tone ringer. Curve A is a plot with RSL<6.8K Ω and shows an increase in the current drawn up to the initiation voltage Vsi. The I-V characteristic after initiation remains unchanged. Curve C illustrates the effect of increasing RSL above 6.8K initiation current decreases but again current alter triggering is unchanged.

UTC TA31002A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 4 C:R SL =13K B:R SL =6.8K A:R SL =5K 34302622181410 6 2 34302622181410 6 2 Vcc(V),Supply voltage 34302622181410 6 2 34302622181410 6 2 Vcc(V),Supply voltage 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Icc(mA),Supply Current 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 Supply Current (mA) Circuit Current-Supply Voltage (No Load) Supply Current Vs. Supply Voltage (No Load) Fig.2 Fig. 3 APPLICATION CIRCUIT TIP RING 0.9 µF SP 560 Ω 22 µF/35V 29V 165k+-1% 0.47 µF+-5% 5.6k - 1 M R3 191k+-1% 6.9nF+-5% 15k 1300:8 Ω C5 0.22 µF 10k UTC TA31002A Fig.4