U4074B Datasheet, PDF (2/6 Pages) TEMIC Semiconductors – Tone Ringer Interface

U4074B
Pin Configuration
aȀ ¹
NC ²
VB ₃
TH 4
2f 5
A1 6
A0 7
NC ⁸
16 _bȀ
15 _GND
14 _O2
13
O1
12 VDD
11 VDC
10 VDC
9
94 7904 e
Mel
aȀ
1
VB ₂
TH ³
2f 4
A1 ₅
A0 ⁶
Mel 7
14 _bȀ
13 _GND
12 _O2
11 _O1
10 VDD
9 VDC
8 _VDC
94 7903 e
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
aȀ, bȀ
V_B
TH
2f
A1, A0
Mel
V_DC
V_DD
O₁, O₂
GND
NC
Function
AC ringing signal input
Output to charging capacitor
Comparator threshold adjust-
ment input
Output for frequency detection
Digital volume adjustment in-
put
Input for melody signal
DC supply diode connections
Microcomputer supply voltage
Outputs to the transducer
Ground
Not connected
Pin Description
Power supply aȀ and bȀ, Pin 1, 14
An ac ringing voltage is supplied to the inputs aȀ and bȀ
via a 0.8 mF decoupling capacitor connected in series with
a 2.2 kΩ. resistor
3. The circuit possesses the following overload resis-
tance 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: V_cs = 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,
V_DD, at pin 10 (12 ).
2 (6)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 06-May-96