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| UTC9106 TONE RINGER DESCRIPTION The UTC9106 is a bipolar integrated circuit designed for telephone bell replacement. LI NEAR I NTEGRATED CI RCUI T FUNCTIONS *Two oscillators *Output amplifier *Power supply control circuit FEATURES *Designed for telephone bell replacement. *Low current drain. *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. *Adjustable for reduced supply initiation current. DIP-8 BLOCK DIAGRAM R2 C3 R3 4 7 6 3 C2 LOW OSC HIGH OSC AMP 8 OUTPUT 1 POWER SUPPLY (WITH HYSTERESIS) 5 2 Note:R2,R3,C2 and C3 are parts externally mounted ABSOLUTE MAXIMUM RATINGS(Ta=25C ) 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 YOUW ANG ELECTRONI CO. CS LTD 1 UTC9106 LI NEAR I NTEGRATED CI RCUI T ELECTRICAL CHARACTERISTICS( Ta=25C ) (All voltage referenced to GND unless otherwise specified) Characteristic Operating Supply Voltage Initiation Supply Voltage1 Initiation Supply Current1 Sustaining Voltage2 Sustaining Current2 Output Voltage High Output Voltage Low IIN(Pin3) IIN(pin7) High Frequency 1 High Frequency 2 Low Frequency Symbol Vcc Vsi Isi Vsus Isus VOH VOL Test Condition See Fig.2 6.8K-Pin 2 to GND See Fig.2 No Load Vcc=Vsus,See Fig.2 Vcc=21V, I8=-15mA Pin6=6V, Pin7=GND Vcc=21V, I8=15mA Pin6=GND, Pin7=6V Pin3=6V, Pin4=GND Pin7=6V, Pin6=GND R3=191k, C3=6800pF R3=191k, C3=6800pF R2=165k, C2=0.47F Min 17 1.4 9.7 0.7 17.0 Typ. 19 2.5 11.0 1.4 19.0 Max 29.0 21 4.2 12.0 2.5 21.0 1.6 Unit V V mA V mA V V nA nA Hz Hz Hz FH1 FH2 FL u u 461 576 9.0 u u 512 640 10 500 500 563 704 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. APPLICATION NOTE The application circuit illustrates the use of the UTC9106 device in typical telephone tone ringer application. 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 voltage (48V) on the exchanged line. After full wave rectification by the bridge diode, the waveform 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 1300 to 8 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 (1300:8) 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 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 UTC9106 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 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 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. YOUW ANG ELECTRONI CO. CS LTD 2 UTC9106 LI NEAR I NTEGRATED CI RCUI T The graph in Fig.3 illustrates the variation of supply current with supply voltage of the UTC9106. Three curves are drawn to show the variation of initiation current with RSL. Curve B ( RSL=6.8k) shows the I-V characteristic for UTC9106 tone ringer. Curve A is a plot with RSL<6.8k 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 after triggering is unchanged. Circuit Current-Supply Voltage (No Load) 8.5 4.0 7.5 3.5 Supply Current Vs. Supply Voltage (No Load) Icc(mA),Supply Current Supply Current (mA) 2 6 10 14 18 22 26 30 34 6.5 5.5 4.5 3.5 2.5 1.5 3.0 2.5 2.0 1.5 1.0 0.5 A:RSL=5K B:RSL=6.8K C:RSL=13K 0.5 2 6 10 14 18 22 26 30 34 Vcc(V),Supply voltage Vcc(V),Supply voltage Fig.2 APPLICATION CIRCUIT TIP C1 0.9F R1 560 Fig. 3 C5 0.22F 1 RSL 8 10k 2 7 RING D1 29V R2 4 165k1% C2 0.47F5% 3 UTC 9106 6 R3 191k1% C3 6.9nF5% C4 22F/35V 5 SP 15k 1300:8 YOUW ANG ELECTRONI CO. CS LTD 3 |
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