U4078B-FP [ATMEL]
Telephone Ringer Circuit, PDSO8,;
| 型号： | U4078B-FP |
| 厂家： | 
ATMEL |
| 描述： | Telephone Ringer Circuit, PDSO8, ATM 异步传输模式 电信 光电二极管 电信集成电路 |
| 文件： | 总5页 (文件大小：58K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U4078B
TELEFUNKEN Semiconductors
Tone Ringer Interface with DC/DC Converter
Description
The tone ringer interface with dc/dc converter U4078B is takes place at Pin 5 either with inductive or opto-coupler
an integrated circuit realized in bipolar technology, which mode.
allows high efficient power transfer. Galvanic separation
Features
Benefits
Suitable for the specification:
High efficient power transfer
FTZ, 1TR2 and ETR2
Rectifier bridge
Z-diode
Amplitude detection
Detection of ringing signal i.e.,
sine-, triangle-, or rectangular (tone ringing) signal
High-voltage bipolar technology
Compact surface mount package (SO8)
22 F
output
V
B
2
1.5 k
1
8
a
a
5
Hysteresis and
power supply
Pulse
shaping
38 kHz
C supply
2f
b
ST
b
1
F
7
3
6
OSC
4
GND
MS
TH
47 pF
180 k
92 7460 e
Figure 1. Block diagram with external circuit
14.04.94
1
TELEFUNKEN Semiconductors
U4078B
Pin Description
Pin
1, 8
2
Symbol
a , b
Function
a’
b’
1
2
3
4
8
7
6
5
AC ringing signal input
V
B
Output to charging capacitor
(for supply)
V
GND
OSC
ST
B
TH
MS
3
4
TH
MS
Comparator threshold adjustment
input
U4078B
Mode selection: inductive or
opto-coupler mode
5
6
ST
Switching transistor connection
OSC
RC circuit for internal oscillator
input
94 7902 e
7
GND
Ground
Functional Description
The ringing ac signal, supplied by the exchange via lines bridge circuit, the smoothing of the power supply is
a, b, is identified by a comparator circuit. An integrated provided by the external capacitance at Pin 2 (22 nF).
oscillator, generates a 38 kHz clock signal, f
coupled 2:1 divider. With the help of the external RC
circuit, oscillation frequency is set at Pin 6.
PNP-transistor connected at Pin 5 enables the power
transmission (transfer) in inductive or opto-coupler mode,
which is selected at Pin 4. For inductive mode, Pin 4 is
open, whereas for opto-coupler mode, Pin 4 is connected
to GND (Pin 7).
, via a
clock
Pin 3: Comparator Threshold
TH
A
Comparator threshold as regards the ringing voltage
is set at ca. 12.5 V. Switching threshold can be increased or
decreased by connecting a resistance at Pin 3 w.r.t. GND.
Pin 4: Mode Selection
MS
The ringing ac signal transfer (transmission) without
potential loss occurs either via an inductive or opto-coupler
mode. Pin 4 is set to a high state by an internal power source
of 4 µA (approximately). This switches the output (Pin 5)
to an operating state for the inductive mode. In case of
opto-coupler mode, Pin 4 is connected to the ground
(Pin 7).
Pin 1,8: Power Supply – a , b
Pins 1 and 8 connect the circuit with the ac ringing signal
supplied by the exchange via lines
a
and b.
A 1µF decoupling capacitor of 1 µF value together with a
series resistance (1.5 kΩ) protect the circuit from overload
across Pins 1 and 8. The circuit features the following
overload protection across the a , b terminals:
Pin 5: Switching Transistor Connection
An external PNP transistor, whose emitter is at V (Pin 2)
S
1) It can withstand a voltage of 110 V @ 50 Hz for
maximum time of 15 seconds.
potential, serves to control the inductive or opto-coupler
mode by connecting the base of the transistor with Pin 5.
In case of inductive mode, the signal, f
is interrupted
clock
2) Testing of the circuit according to figure 2 does not
destroy the circuit under following conditions:
for the duration of t
= 32/f
, with every transition
pulse
clock
(rise or fall) of the ringing ac signal, f . During the
ring
interruption, the setting at Pin 5 is such that the coil is
critically damped (attenuated), whereas a current of 10 µA
flows when the transistor at Pin 5 is switched on during the
Charging voltage of surge capacitance: V = 2 kV
CS
Pulse shape: 10/700 µs
Pulse sequence: 30 s
No. of surges: 10
following t
up to the next edge of the pulse.
pulse
Polarity change after 5 surges
In case of opto-coupler mode, the external transistor is
switched on for a period of t = 32/f with every flank
pulse
clock
Pin 2: Charging Capacitor
(power supply filtering)
of the pulse of f
.
ring
Pin 5 is at high resistance upto the next edge (flank) of the
After the rectification of the ringing ac signal across the transition pulse of the ringing ac signal.
2
U4078B
TELEFUNKEN Semiconductors
15
25
a
10 F
Tone ringing
Figure 1
2 kV
110
0.22 F
b
93 7575 e
Figure 2
Absolute Maximum Ratings
Reference point Pin 7, unless otherwise specified
Parameters
Symbol
Value
50
Unit
mA
°C
Supply current
Pin 1, 8
I
s
Ambient temperature range
T
amb
–10 to + 60
Storage temperature range
Tstg
–40 to + 125
°C
Power dissipation
Tamb = 60°C
Junction temperature
360
125
mW
Ptot
Tj
°C
Thermal Resistance
Parameters
Symbol
RthJA
Value
180
Unit
K/W
Junction ambient
Electrical Characteristics
Reference point Pin 7, T
= –10 to + 60°C, V = 15 V, unless otherwise specified
B
amb
Parameters
Test Conditions / Pin
fosc = 65 to 87 kHz
Symbol
Min
Typ
420
12.5
Max
500
15
Unit
µA
V
Supply current
Is
Pin 1, 8
Threshold voltage for
slope identification
Audio impedance
Pin 3 open
10
200
26
VTH
R
f = 300 to 3400 Hz
V1,8 = 1 5 Vrms
kΩ
V
Internal voltage limitation
Leakage current
30
32
Vz
Iz = 1 mA
100
150
1. phase
2. phase
Pin 5
i5
i5
µΑ
µΑ
7
10
38
1
13
Base current (PNP open)
Oscillator frequency range
Duty-cycle
Pin 5
Pin 6
Pin 6
IB(5)
fosc
µA
kHz
32.5
0.67
48.5
32/f
Interrupted (pause) time
of the output signal
clock
3
TELEFUNKEN Semiconductors
U4078B
Time Sequence
t
= 32/f
. During interruption, the signal at
clock
Internal clock frequency without RC tolerance
pulse
ST (Pin5) is of such a value that the coil is critically
attenuated (damped).
t
During this time, a clock signal is given at
Pin 5 (ST).Pin 4 is open or ST is high ohmic.
(MS=GND)
clock
I (PNP) = I
10 µA
S
ST
A current of I
every polarity change whereby MS is grounded.
150 µA is drawn from Pin 5 (ST) by
ST
t
By every polarity change of the call signal and MS
open, the clock signal is interrupted for a time
duration
pulse
Call signal
ST
1. Phase
ST
MS = open
2. Phase
t
ST
MS = 0
92 7471 e
1
f
cycle
tcycle
tpuls
e
t
92 7461 e
Current sequence at Pin 5 with an external PNP transistor connected as shown in figure 1. (f
= 38 kHz)
clock
Ordering Information
Package
SO8
Type
U4078B-FP
Dimensions in mm
Package: SO8
4
U4078B
TELEFUNKEN Semiconductors
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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.
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such substances.
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Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
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