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U4076B
Three-Tone Ringer for Telephone Sets
Description
The three-tone ringing integrated circuit U4076B, in conjunction with a piezo transducer or loudspeaker replaces the normal electromechanical telephone bell. It is operated with the ringing current from the exchange. There is also a possibility of operating the IC with the dc supply voltage, being developed for large operating range. The integrated circuit is overload protected.
Features
D Three-tone ringing sequence with 800 Hz, 1067 Hz
and 1333 Hz
D Clock oscillator with ceramic resonator or LC series
cct possible
D Sequence frequency adjustable between 2.5 Hz and
25 Hz
D Input protective diode D On-chip rectifier bridge D Protection circuit against ringing in a parallel circuit
D D D D D
Adjustable volume Push-pull output stage Piezo transducer or loudspeaker connection Common input for frequency and call recognition Reduced pulse duration for electromagnetic transducers
Benefit
D Suitable for German Post Office Specification,
FTZ 121671 Pfl. 3, edition dated 24.03.82
22 m F 2.2 k W a ~ ~ b 0.8 m F 4 7 (5) 6 (7)
600 kW 10 (11)
43 kW 8 (9)
4.7 nF 9 (10) (15) 13
Ground: output signal Open: output signal
(8) Supply 5 (6) Level monitoring Tone sequence oscillator Divider 32:1 Tone signal generator 11 Reset a (12) 100 kW log 12 (13)
96 ms 127 ms Frequency monitoring Frequency Three state Divider 32:1 Divider 14:1 Clock signal generator 3 (3) 93 7792 e Reset b 2 (2) 455 kHz Divider 128:1 Divider 2:1
RL
14 (16) 1 (1)
Figure 1. Block diagram and application circuit
Case: DIP14 or SO16-L (Pin connections for SO 16-L case in bracket) TELEFUNKEN Semiconductors Rev. A1, 15-May-96 1 (6)
Preliminary Information
U4076B
Pin Description
Pin 1 (1) Symbol Function Frequency monitoring Open: 23 to 54 Hz Ground: 12 to 54 Hz With Pin 6 (7) connected: Switched off Clock signal generator Ground Power supply Charging capacitor, CL, for bridge rectifier Frequency oscillator Pin 8, 9, 10 (9, 10, 11) 11, 12 (12, 13) 13 (15) 14 (16) (4, 14) Symbol Function Tone sequence Frequency oscillator Output signals
2, 3 (2, 3) 4 (5) 5, 7 (6, 8) 6 (7) (8, 9, 10)
Output signal shape Open = short pulse width Ground = 1:1 Load resistance, RL Not connected
Pin Connections and Functional Description Including External Circuitry
Pin 1: Frequency monitoring
Frequency is monitored via Pin 1. The following possibilities are available (three-state logic): a) Pin 1 is open: ringing frequency is between 23 and 54 Hz. b) Pin 1 is grounded: ringing frequency is between 12 and 54 Hz. c) Pin 1 is connected to Pin 6 (7): ringing frequency has no influence (dc operation)
circuit. Instead of a ringing ac current supplied by the exchange, the IC can be driven by a dc voltage applied directly to terminals 6 (7) (+) and 4 (5) (-). An integrated Z diode limits the maximum supply voltage range up to 27 V.
Pins 8, 9 and 10 (9, 10, 11): Sequence frequency adjustment
The sequence of the three-tone ringing frequency (800, 1067 and 1333 Hz) is determined by the external network calculated as follow:
Pins 2 and 3 (2, 3): Clock signal generator
A ceramic resonator for a frequency of 455 kHz must be connected between Pin 2 (2) and Pin 3 (3). The clock frequency of the generator is used for three-tone ringing sequence and control signals for frequency identification.
+ f192 whereas f + (43 kW )ICR ) 47 nF if: k 0.95 then R = 0 to 20 k if: k 1 then R = 30 to 150 k > 200 k if: k 1.2 then R
f2
OSC OSC V
v v v
The sequence frequency adjustment is determined by the frequency prescaler ratio in the IC.
Pins 11 and 12 (12, 13): Output signal
The three-tone ringing sequence of 800 Hz, 1067 Hz and 1333 Hz is realized if the clock oscillator is synchronised with a ceramic resonator of 455 kHz between Pins 2 (2) and Pin 3 (3). This gives excellent tone frequency and eliminates complicated frequency setting procedures. The output signal without load is (2 V6(7) - 2.5) Vpp. The output stage transducers in BTL configuration can process an average current of up to 20 mA, whereas a short time current of 40 mA is possible in both direction when t = 0.1 ms. An external current limitation is necessary when the IC is operating with voltage between Pin 6(7) and Pin 4 (5). The tone sequence always starts at the lower frequency.
Pin 4 (5): Ground
Reference point for all voltages.
Pins 5, 6 and 7 (6, 7, 8): Power supply
Pins 5 (6) and 7 (8) connect the circuit with a ringing ac supplied by the exchange via lines a and b. A decoupling capacitor of 1 mF in series with 2.2 kW resistance is needed for overvoltage protection and the insertion loss requirement of the German Post Office specifications. The supplied ac current is rectified by the on-chip bridge circuit. The rectified current charges the capacitor on Pin 6 (7), which supplies the dc voltage for the integrated
2 (6)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 15-May-96
U4076B
Pin 13 (15): Output signal shape
Output signal has different duty cycles according to the position of Pin 13 (15). When grounded it has a duty cycle of 1:1. When using a dynamic loudspeaker (activation via transformer/capacitor), a reduced signal is recommended. This can be achieved by connecting a capacitor greater than 1 nF between Pin 13 (15) and ground. Pin 4 (5) and the dummy load is switched-off. In off-position, Pin 14 (16) is connected with Pin 6 (7) internally and the dummy load is switched on.
Overload protection
The integrated circuit can withstand an ac voltage of 110 V / 50 Hz for 15 seconds between terminals a and b. The circuit will not be damaged by a surge voltage test with the following conditions: Charging voltage of surge capacitance: Vcs = 2 kV Pulse shape: 10/700 s Pulse sequence: 30 s No of surges: 10 Polarity change after five surges 25 W a
Pin 14 (16): Switched on/off
Switched on/off is controlled by Pin 14 (16). The dc voltage on the charge capacitor between Pin 4 (5) and 6 (7) is loaded a dummy load as long as the tone ringing is not switched-on. In on-position (amplitude and frequency recognition), Pin 14 (16) is connected internally with 15 W 10 mF
2 kV
110W
0.22 mF
Tone ringing Figure 1 b
93 7575 e
Figure 2. Surge voltage test circuit
Absolute Maximum Ratings
Reference point Pin 4 (5) unless otherwise specified Parameters Supply current Pins 5 and 7 (6, 8) Output current Pins 11 and 12 (12, 13) Junction temperature Ambient temperature range Storage temperature range Power dissipation Tamb = 60 C DIP14 SO16-L Symbol IS I0 Tj Tamb Tstg Value 50 50 125 - 25 to + 60 - 40 to + 125 Unit mA mA C C C
"
Ptot Ptot
860 720
mW mW
Thermal Resistance
Parameters Junction ambient DIP14 SO16-L Symbol RthJA RthJA Value 75 90 Unit K/W K/W
TELEFUNKEN Semiconductors Rev. A1, 15-May-96
3 (6)
Preliminary Information
U4076B
Electrical Characteristics
VS = 10 V, fclock = 455 kHz,Tamb = 25 to 60C. Reference point Pin 4 (5), Pin 13 (15) ground, unless otherwise specified. Parameters Supply current (no load) outputs open V6(7) = 10 V Tamb = +25C Frequency range of the ringing input current a) Pin 1 - open b) Pin 1 - grounded c) Pin 1 - connected to Pin 6 (7) AC-operation Switch-on threshold Switch-off threshold DC-operation Switch-on threshold Switch-off threshold Output on resistances at 20 mA Output signal frequency Test Conditions / Pins Pins 5 and 7 (6) Symbol Min. Typ. Max. Unit
IS Pins 5 and 7 (6, 8)
0.9
1.15
1.3
mA
fring
23 to 54 12 to 54 DC operation 6.5 3.5 2.75 2.0 8.5 5.5 4.75 4.0 400 400 448/455 800/812 1067/1083 1333/1354 10 27 30
Hz
Pin 6 (7)
V
Pin 6 (7) Pin 6 (7) Pin 11 (12) Pin 12 (13) Pins 11 and 12 (12,13)
Build-up time of clock oscillator Internal voltage limitation IZ=1 mA Repetition rate oscillator: Low state High state Allowable resistor
Ron Ron f0 f1 f2 f3 tB 25
V V W W kHz Hz Hz Hz ms V
V6-4 (7-5) Pin 6 (7) Pin 8 (9) Pin 8 (9) Pins 8-10 (9-11)
V8(9) V8(9) R
0.5 0.043
0.6 2.0
0.7 2
V V M
Ordering Information
Extended Type Number U4076B-FL U4076B Package SO16 DIP14 Remarks
4 (6)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 15-May-96
U4076B
Dimensions in mm
Package: SO16-L
Package: DIP14
TELEFUNKEN Semiconductors Rev. A1, 15-May-96
5 (6)
Preliminary Information
U4076B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
6 (6)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 15-May-96

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