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UTC TA31002A LINEAR INTEGRATED CIRCUIT
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
1 2 3 4
8 7 6 5
Output High Freq. Time Constant High Freq. Time Constant GND
RSL Low Freq. Time Constant Low Freq. Time Costant
ABSOLUTE MAXIMUM RATINGS(Ta=25C )
PARAMETER
Supply Voltage Power Dissipation Operating Temperature Storage Temperature
SYMBOL
Vcc Pd Topr Tstg
VALUE
30 400 -45 to 85 -65 to 150
UNIT
V mW C C
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
UTC TA31002A LINEAR INTEGRATED CIRCUIT
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
ELECTRICAL CHARACTERISTICS( Ta=25C, all voltage referenced to GND unless otherwise specified)
PARAMETER
Operating Supply Voltage Initiation Supply Voltage (note 1) Initiation Supply Current (note 1) Sustaining Voltage (note 2) Sustaining Current (note 2) Output Voltage High Output Voltage Low IIN(Pin 3) IIN(Pin 7) High Frequency 1 High Frequency 2 Low Frequency
SYMBOL
Vcc Vsi Isi Vsus Isus VOH VOL
TEST CONDITIONS
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 2.8 11.0 1.4 19.0
MAX
29.0 21 4.2 12.0 2.5 21.0 1.6 500 500 563 704 11.0
UNIT
V V mA V mA V V nA nA Hz Hz Hz
FH1 FH2 FL
461 576 9.0
512 640 10
*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
UNISONIC TECHNOLOGIES CO., LTD.
2
UTC TA31002A LINEAR INTEGRATED CIRCUIT
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 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 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 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 fequency 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 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 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
UNISONIC TECHNOLOGIES CO., LTD.
3
UTC TA31002A LINEAR INTEGRATED CIRCUIT
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 Fig.2
Vcc(V),Supply voltage Fig. 3
APPLICATION CIRCUIT
TIP
C1 0.9 F R1 560 C5 0.22 F 1 8 10k
2
5.6k - 1 M
7
RING
3 C4 22 F/35V D1 29V R2 4 165k+-1%
UTC TA31002A
6
R3 191k+-1% C3 6.9nF+-5%
SP
5
C2 0.47 F+-5%
15k
1300:8
Fig.4
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4

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