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U4074B
Tone Ringer Interface
Description
The U4074B is a monolithic integrated circuit that contains all integral components of a ringing circuit for telephone sets used in conjunction with a microcomputer. The combination of a microcomputer and the U4074B permits flexible programming of the ringing sequence ( melody), tone and volume control. Ringing frequency detection takes place in the microcomputer. The U4074B is responsible for the interface to the line, driver stages for the piezoelectric sound transducer, volume adjustment, amplitude detection, voltage supply for the microcomputer and other auxiliary functions.
Features
D Suitable for specifications FTZ 1TR2 and ETR 2 D Rectifier bridge D Z-diode D Amplitude detection D Supply voltage for microcomputer 3.5 @ D DC operation possible D Bridge push-pull output stage
22 mF V B 2(3) TH 130 kW 3(4) VDD 10 (12) 2f 4(5) 47mF
D CMOS-compatible microcomputer interface D 2-bit log. volume adjustment D High-voltage bipolar technology, 30 V
v 1.5 mA
Benefits
D mC controlled melody and volume D Low number of external components
On/Off a 0.8mF (1)1 a Control VRef
+V B 12(14) O2
2.2 kW Ringing signal b (16)14 b Decoder and DA converter
2f +V B PIEZO O1 Transducer 11(13)
93 7793 e
(15)13 GND 5(6) A1 Volume
6(7) (9)7 Mel A0
VDC 8(10)
9(11)
Figure 1. Block diagram and application circuit ( pin connections for SO16 in brackets )
TELEFUNKEN Semiconductors Rev. A1, 06-May-96
1 (6)
Preliminary Information
U4074B
Pin Configuration
a
1 2 3 4 5 6 7 8
94 7904 e
16 15 14 13 12 11 10 9
b GND O2 O1 VDD
a
1 2 3 4 5 6 7
94 7903 e
14
b
NC VB TH 2f A1 A0 NC
VB TH 2f A1
13 GND 12 O2 11 O1 10 VDD 9 8 VDC VDC
VDC VDC Mel A0 Mel
Pin 1, 14 (1,16) 2 (3) 3 (4) 4 (5) 5, 6 (6, 7) 7 (9) 8, 9 (10, 11) 10 (12) 11, 12 (13, 14) 13 (15) (2, 8)
Symbol a ,b VB TH 2f A1, A0 Mel VDC VDD O1, O2 GND NC
Function AC ringing signal input Output to charging capacitor Comparator threshold adjustment input Output for frequency detection Digital volume adjustment input Input for melody signal DC supply diode connections Microcomputer supply voltage Outputs to the transducer Ground Not connected
via a 0.8 mF decoupling capacitor connected in series with a 2.2 k. resistor 3. The circuit possesses the following overload resistance at terminals a and b.The circuit can withstand a voltage of 110 V with a frequency of 50 Hz at terminals a and b for a maximum of 15 s. 4. Testing the circuit with the configuration shown in figure 2 does not destroy the circuit under the following conditions. Charging voltage of surge capacitance: Vcs = 2 kV Pulse shape: 10/700 ms Pulse sequence: 30 s Number of surges: 10 Polarity change after 5 surges See figure 2.
Smoothing Capacitors, Pin 2, 10
After rectification of the ac ringing voltage via the integrated rectifier bridge, the pulsating DC voltage is smoothed by the external capacitor ( 22 mF to 47 mF) at Pin 2 ( 3 ). The charging voltage is restricted to a maximum of 30 V by an integrated Z-diode. A 47 mF external capacitor of will smooth the regulated supply, VDD, at pin 10 (12 ).
Pin Description
Power supply a and b , Pin 1, 14 An ac ringing voltage is supplied to the inputs a and b
2 (6)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 06-May-96
U4074B
15 W 25 W a 110W 0.22 mF Tone ringing Figure 1 b
93 7575 e
10 mF 2 kV
Figure 2. Test circuit
Outputs O1, O2 Pin 11, 12
The bridge push-pull outputs are used for direct connection of a piezo electric sound transducer with a typical value of 80 nF. The output stage transistors can process up to 20 mA in both directions. The output signal without load is 2 Ri (VB - VDD - 3.5 V)
Supply Voltage VDD, Pin 10 (12)
An external load, such as a microcomputer, can be connected to VDD. This value of VDD is 3.5 V for a maximum load current of 1.5 mA. VDD is highly resistive and can block up to 6 V in call and idle states. The typical value of the back-up capacitor is 47 mF.
+
V (12,11 open -1 V (12,11) load
R load
where Rload = 400 W
Frequency Detection 2f, Pin 4 (5)
Frequency detection takes place in the microcomputer. For this purpose, the output 2f supplies a square wave signal with double ringing frequency to the microcomputer. The output signal is CMOS-compatible. This terminal is highly resistive in idle and call states.
Volume Adjustment A1, A0 Pin 5 (6), 6 (7)
The ringing volume is adjusted by means of a 2-bit D/A converter. The maximum volume is achieved with the bit combination A1 (MSB) = 1 and A0 (LSB) = 1. The volume can be reduced by approximately 35 dB (A) if a bit combination of A1 = 0, A0 = 0 is supplied. The volume is programmed by supplying a ground potential to these inputs.
Comparator Threshold Adjustment TH Pin 3 (4)
The on/ off threshold of the 2f comparator can be adjusted ( terminal against ground respectively VDD ). To fulfill the Bundespost specification this terminal should be open.
Melody, Pin 7 (9)
The melody input inverts the activation phase of the bridge push-pull output stage. The input is CMOScompatible and suitable for processing ringing frequencies.
VDC, Pin 8, 9
Decoupling diode for dc supply.
TELEFUNKEN Semiconductors Rev. A1, 06-May-96
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Preliminary Information
U4074B
Absolute Maximum Ratings
Reference point, Pin 13 ( 15), unless otherwise specified, Tamb = 25C Parameters Supply current Output current Junction Temperature Ambient temperature Storage temperature Power dissipation Tamb = 60C DIP14 SO16 Pin 1, 14 ( 1, 16 ) Pin 11, 12 ( 13,14) Symbol Is I0 Tj Tamb Tstg Ptot Ptot Value 50 50 125 -25 to + 60 -40 to + 125 860 400 Unit mA mA C C C mW mW
Thermal Resistances
Parameters Junction ambient DIP14 SO16 Symbol RthJA Value 75 160 Unit K/W K/W
Electrical Characteristics
Tamb = -10 to 60C, reference point is Pin 13 ( 15), unless otherwise specified Parameters Current consumption Test Conditions / Pins Pin 1, 14 (1, 16) O1 = O2 = open A1 = A0 = 0, VB = 15 V IDD = -300 mA, Pin 2 (3) open Pin 1, 14 (1, 16) on threshold off threshold f = 300 to 3400 Hz, Va,b = 1.5 Vrms I(O1, O2) = IZ = 1 mA (Pin 2) 0.5 mA > IDD < 1.5 mA Va , Vb , VB Symbol I Min. Typ. 1.1 Max. 1.4 Unit mA
Input voltage
V R Ron VZ
9.5 4.5 200
10.5 5.5
11.5 6.5
V V kW
Audio frequency impedance Output on resistance Internal voltage limitation Supply voltage for microcomputer Leakage current
"20 mA v 3.5 V v
400 25 3.15 27 3.5 30 3.85
W
V V
I2f IA0 IA1 I IDD
10
mA mA
mA
VA1, VA0, VMelody 6 V 5.5 V VDD 6 V 0 V VDD 5.5 V
vv vv
100 10 80
Diode load current
4 (6)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 06-May-96
U4074B
Order Information
Extended Type Number U4070B-FP U4074B Package SO16 DIP14 Remarks
Dimensions in mm
Package: DIP14
Package: SO16
TELEFUNKEN Semiconductors Rev. A1, 06-May-96
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Preliminary Information
U4074B
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, 06-May-96

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