31002A

UNISONIC TECHNOLOGIES CO., LTD 31002A TELEPHONE TONE RINGER DESCRIPTION The UTC 31002A is a bipolar integrated circuit designed for telephone bell replacement. It can also be used as alarms or other alerting devices. LINEAR INTEGRATED CIRCUIT SOP-8 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 *Pb-free plating product number: 31002AL ORDERING INFORMATION Ordering Number Normal Lead Free Plating 31002A-D08-T 31002AL-D08-T 31002A-S08-R 31002AL-S08-R 31002A-S08-T 31002AL-S08-T Package DIP-8 SOP-8 SOP-8 Packing Tube Tape Reel Tube www.unisonic.com.tw Copyright © 2008 Unisonic Technologies Co., Ltd 1 of 6 QW-R108-005.C 31002A PIN CONFIGURATIONS LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R108-005.C 31002A BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R108-005.C 31002A ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER Supply Voltage LINEAR INTEGRATED CIRCUIT SYMBOL RATINGS UNIT VCC 30 V DIP-8 PD 800 mW Power Dissipation 400 mW SOP-8 PD Operating Temperature TOPR -45 ~ +85 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (Ta=25°C, all voltage referenced to GND unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX Operating Supply Voltage Vcc 29.0 Initiation Supply Voltage (Note 1) Vsi See Fig.2 17 19 21 Initiation Supply Current (Note 1) 6.8K-Pin 2 to GND 1.3 2.8 4.2 Sustaining Voltage (Note 2) Vsus See Fig.2 9.7 11.0 12.0 Sustaining Current (Note 2) Isus No Load Vcc=Vsus, See Fig.2 0.7 1.4 2.5 Vcc=21V, I8=-15mA 17.0 19.0 21.0 Output Voltage High VOH Pin6=6V, Pin7=GND Vcc=21V, I8=15mA 1.6 Output Voltage Low VOL Pin6=GND, Pin7=6V 500 Pin3=6V, Pin4=GND IIN(Pin 3) 500 Pin7=6V, Pin6=GND IIN(Pin 7) High Frequency 1 FH1 R3=191K, C3=6800pF 461 512 563 High Frequency 2 FH2 R3=191K, C3=6800pF 576 640 704 Low Frequency FL R2=165K, C2=0.47μF 9.0 10 11.0 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. UNIT V V mA V mA V V nA nA Hz Hz Hz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R108-005.C 31002A APPLICATION NOTE LINEAR INTEGRATED CIRCUIT The application circuit illustrates the use of the UTC 31002A 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 (FH1) and 640 Hz (FH2) at a 10 Hz (FL) rate. The loudspeaker load is coupled through a 1300Ω to 8Ω 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 (1300Ω:8Ω) 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 relation 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 relation FH1=1/1.504 R3*C3 and FH2=1/1.203 R3*C3 Pin 2 of the UTC 31002A 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 31002A. 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 31002A tone ringer. Curve A is a plot with RSL