DTMF GENERATOR TELEPHONE DIALLING This integrated circuit cual-to

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TEA1043
DTMF GENERATOR TELEPHONE DIALLING
This integrated circuit cual-torie multi frequency (DTMF) generator, supplying frequency combinations accordance with CCITT recommendations) pushbutton telephones, with single contact keyboard.
various frequencies derived from crystal-controlled oscillator followed sinewave synthesizer.
technology allows digital arid analogue functions implemented same chip. built current/voltage regulator active output amplifier substantially reduce number external components. Only quartz crystal 4,78 resistors capacitors required.
circuit features:
wide operating line current range
operating voltage down volt (standby volt)
individual tone level adjustment required
temperature stabilized signal levels
line current independent signal levels;
output stage line reculator included
pins protected agains: electrostatic discharges
roll-over provided
operates with cost quartz crystal
external components required
electronic mute facility
power consumption standby mode
OSCIL-
LATOR
KEYBOARD LOGIC
CURRENT STABILIZER TEA1043 LINE REGULATOR
PROGRAMMABLE DIVIDER 1209 1633Hz COUNTER DIGITAL
CONVERTER
PROGRAMMABLE DIVIDER COUNTER DIGITAL ANALOGUE CONVERTER
ACTIVE OUTPUT STAGE
PACKAGE OUTLINES
TEA1043P: 16-lead DIL, elastic (SOT-38). 1043D1: 16-lead DIL, oeramic (SOT-74B).
Fig. Block diagram (dotted lines stabilized supply rails).
Mullard
1982
TEA1043
RATINGS
Limiting values accordance with Absolute Maximum System (IEC 134)
Supply current
Surge current
Input series resistance min.
Operating ambient temperature range ^amb
Storage temperature range Tstg to+125
Junction temperature
CHARACTERISTICS
V|\| Tam|-> unless otherwise specified.
symbol min. typ. max. unit conditions
operating voltage
d.c.;
line current
level
level
standby mode
internal impedance 1150 3400
tone frequencies
frequency
quartz crystal
high 1209
1336
1477
1633
dividing error 0,11
nom. output level
lower freq. adjustable
higher freq. adjustable
tolerance output level
pre-emphasis without filter components
distortion with respect
total level dtot maximum tone level
with first-order filter
start time with recommended external components
mute output sink current
switch bounce elimination
required keyboard
resistance
contact
contact
1982
Mullard
DTMF generator telephone dialling TEA1043
Fig. designation.
PINNING
V|\| negative supply
filter output
keyboard input
keyboard input
MUTE mute output
keyboard input
keyboard input
filter input/ input audio
amplifier
output DAC/DTMF tones
oscillator input
column keyboard input
column keyboard input
column keyboard input
column keyboard input
input low-pass filter
positive supply
metal film resistor MR16
metal film resistor SFR16
metal film resistor SFR16
metal film resistor SFR16
metallized polyester film capacitor
solid aluminium electolytic capacitors
polarity guard transient suppressor
bridge (see Fig.
quartz crystal
Fig. 2700 (for
resistor Fig.
BAS11 BZW03-4,
Mullard
1982
TEA1043
Fig. Application diagram with electronic mute switch second-order filter.
metal film resistor MR16 Fig.
metal film resistor SFR16
metal film resistor SFR16 (depends audio voltage
metal film resistor SFR16
metal film resistor SFR16
metal film resistor SFR16
metal film resistor SFR16
metallized polyester film capacitor Fig.
solid aluminium electrolytic capacitor
miniature ceramic plate capacitor
metallized polyester film capacitor
transient suppressor bridge (see Fig. BAS11 BZW03-.
diode BAW62
transistor BC338
transistor BC548
transistor BC558
transistor BC328
quartz crystal 4,783
TR1/TR2= BSR50 TR3/TR4 BSR60 then kft, additional choke series with circuit required meet CEPT CS203 distortion requirements.
1982
Mullard
DTMF generator telephone dialling
TEA1043
Y3-1209 133E 1477 1333
-852
7Z8E4S6.1
Fig. Allocation dialling tones keyboard functions.
Fig. Polarity-guard line-transient suppression bridge Diodes BAS11. Voltage regulators BZW03-.
group
order
filter
,nF) IkSil |i5.
ordiiir
f.lter (riFj
balance return
(dB)
Z|_=
CCITT
'A//
total tone output level (dBm)
balance return loss 20log1(
!z-zo
frequency (kHz)
Fig. Level adjustment (see Figs
Fig. Balance return loss measured with external components Fig.
(kHz)
Fig. Frsquency spectrum circuit with second order filter (see Fig.
Mullard
1982
TEA1043
APPLICATION (see Fig. Line matching
there impedance match between lines dialling circuit, balance return loss will high reflections line will highly damped. Figure shows that balance return loss when using application diagram shown Fig. more than variation balance return loss with frequency largely caused impedance variation clue low-pass filter capacitor (C2) radio-frequency interference filter capacitor Since highest line impedance that likely encountered internal impedance dialling circuit this level reduced match lower impedance lines adding external resistor between pins direct current must eliminated capacitor must connected series with resistor.
internal impedance external resistor between pins
internal impedance external resistor between pins 2700
Output level adjustment
tone output levels subject some spread manufacturing tolerances adjusted selection value resistor connected
level higher-frequency tone however always above that lower-frequency tone. total production circuits therefore divided into groups. group which integrated circuits belongs identified dots body circuit, number dots corresponding with group number. combined tone output level shown function resistor value with group number parameter Fig. After resistor value been selected obtain required tone output level, value filter capacitor connected same must determined. passive first-order filters (Fig. time-constant (RC) must /js. active second-order filters must These values accommodate different attenuation levels various tone frequencies hump breakpoint filters.
Fig. D.C. characteristics.
1982
Mullard
DTMF generator telephone dialling
TEA1043
16-LEAD DUAL IN-LINE; PLASTIC (SOT-38)
0,53
0,51
^0,76121
0,32
i-r^^rTTOirr
view
Dimensions
-Em-
Positional accuracy.
Maximum Material Condition.
Centrelines leads
within nominal position shown; worst case, spacing between leads deviate from nominal
Lead spacing tolerances apply from seating plane line indicated.
SOLDERING
hand
Apply soldering iron below seating plane more than above it).
temperature below must contact more than seconds; between
more than seconds.
wave
maximum permissible temperature solder this temperature must contact with joint more than seconds. total contact time successive solder waves must exceed seco ids.
device mounted seating plane, temperature plastic body must exceed specified storage maximum. printed-circuit board been heated, forced cooling necessary immediately after soldering keep the.temperature within permissible limit.
Repairing soldered joints
same precautions limits apply above.
Mullard
1982
TEA1043
16-LEAD DUAL. IN-LINE; CERAMIC (SOT-74)
-8,25
Dimensions
Remarks
view
'(J)' Positional accuracy.
Maximum Material Condition.
Centre-lines leads within +0,127 nominal position shown; worst case, spacing between leads deviate from nominal
Lead spacing tolerances apply from seating plane line indicated.
Leads given positive misalignment that they grip after insertion.
Leads Ni-Fe, pure plated.
1982
Mullard

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