DATA SH EET
Product specification
File under Integrated Circuits, IC01 May 1992
INTEGRATED CIRCUITS
TDA1579
TDA1579T
Decoder for traffic warning (VWF)
radio transmissions
May 1992 2
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
GENERAL DESCRIPTION
The TDA1579 decoder is for radio transmissions having
57 kHz amplitude-modulated subcarriers as used in the
German 'Verkehrs Warnfunk' (VWF) traffic warning
system.
Features
•Selective subcarrier amplifier (57 kHz) with gain control
•Transmitter identification signal (SK) decoder
•Area identification signal (BK) and announcement
identification signal (DK) active filtering
•BK and DK decoders (Schmitt trigger with switched
hysteresis)
•BK and DK switch-on/switch-off delay circuits
•Driver output for SK indicator (LED)
•SK and BK control outputs.
QUICK REFERENCE DATA
Measured in Fig.1 at ViSK = 8 mV; f = 57 kHz amplitude modulated with fm = 34.95 Hz and m = 60% for
‘BK-traffic area C’ signal; or with fm = 125 Hz and m = 30% for DK signal.
PACKAGE OUTLINES
TDA1579: 18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 12.
TDA1579T: 20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 12.
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage VP7.5 8.5 12 V
Supply current IP−6−mA
Nominal input voltage at f = 57 kHz ViSK −8−mV
Input impedance at f ≤57 kHz Zi100 −−kΩ
Control level −3 dB ViSK −2.4 −mV
Input voltage peak-to-peak value Vi(p-p) 2−−V
SK switch-on
threshold level mBKon −42 −%
SK switch hysteresis ∆mBK −3.5 −dB
SK switch-on delay tdSKon −150 −ms
SK switch-off delay tdSKoff −750 −ms
DK switch-on
threshold level mDKon −13 −%
DK switch hysteresis ∆mDK −3.6 −dB
DK switch-on delay tdDKon −750 −ms
DK switch-off delay tdDKoff −750 −ms
Ambient operating
temperature range Tamb −30 −+ 80 °C
May 1992 3
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134). All pin numbers in this table apply to
TDA1579; for TDA1579T refer to Fig.1.
CHARACTERISTICS
VP = 8.5 V; Tamb = 25 °C; measured at nominal input signal: ViSK = 8 mV, f = 57 kHz amplitude modulated with
fm = 34.95 Hz and m = 60% for ‘BK-traffic area C’ signal; or with fm = 125 Hz and m = 30% for DK signal.
All pin numbers in this table apply to TDA1579, for TDA1579T refer to Fig.1.
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage pin 7 VP = V7-18 −−15 V
Switch output voltage pin 1 V1-18 −−23 V
pins 2 or 3 V2; 3-18 −−15 V
pins 1, 2 or 3 −V1; 2; 3-18 −−0.5 V
Switch output current pin 1 I1−−50 mA
pins 2 or 3 I2; 3 −−5mA
pins 1, 2 or 3 −I1; 2; 3 −−10 mA
Signal input voltage pin 13 V13-18 −−V
P
pin 13 −V13-18 −−0.5 V
Signal input current pin 13 −I13 −−10 mA
Total power dissipation Ptot −−800 mW
Storage temperature
range Tstg −55 −+150 °C
Operating ambient
temperature range Tamb −30 −+80 °C
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage pin 7 VP7.5 −12 V
Supply current pin 7 IP−610mA
SK amplifier/decoder
Input impedance f ≤ 57 kHz |Zi| 100 −−kΩ
Input voltage (peak-to-
peak value) Vi(p-p) 2−−V
Input voltage at start of
gain control Vo9BK = −3 dB ViSK −2.4* −mV
Voltage gain V9BK/V13SK Gv9-13 −44* −dB
Gain spread ± ∆ Gv9-13 −−2dB
Gain control range ∆Gv40 −−dB
Controlled output voltage Vo9BK −440 −mV
Vo9DK −220 −mV
May 1992 4
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
BK circuit
Switch-on threshold level pin 3 high-Z Vo5BKon 600 670 750 mV
Switch hysteresis 3 3.5 4 dB
BK switch threshold level
for BK-off (SK-off) pin 3
conducting V4-18off 0.8 0.88 0.97 V
(typ. value = 0.21V8-18)
SK output (pin 3)
allowable load current I3−−1.5 mA
saturation voltage I3 = 1.5 mA V3-18sat −−0.35 V
rejection voltage I3 < 5 µAV
3-18 18 −−V
Indicator driver (pin 1)
allowable load current I1−−40 mA
saturation voltage I1 = 20 mA V1-18sat −−0.8 V
rejection voltage I1 < 10 µAV
1-18 23 −−V
DK circuit
Switch-on threshold level pin 2 high-Z V15DKon 600 670 750 mV
Switch hysteresis 3.1 3.6 4.1 dB
DK switch threshold level
for DK-off (Schmitt pin 2
trigger output) conducting V16-18off −0.6 −V
(typ. value 1 × VBE)
DK output (pin 2)
allowable load current I2−−1.5 mA
saturation voltage I2 = 1.5 mA V2-18sat −−0.35 V
rejection voltage I2 < 5 µAV
2-18 18 −−V
BK and DK filter amplifiers
Open loop gain f = 100 Hz Go84 −−dB
Current gain Gi120 −−dB
Input bias current ± Ii−−50 nA
Output offset voltage R5-6 = R14-15
= 680 kΩ± Vo5-8 −−50 mV
±V15-8
Available output current ±Io1−−mA
Output resistance Ro−2 3.5 kΩ
Allowable load
capacitance CL−−50 pF
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Vo5BKon
Vo5BKoff
----------------------
V15DKon
V15DKoff
----------------------
May 1992 5
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
* Selectable by R12-8 or Z10-8.
Internal reference voltage
Output voltage V8-18 4.0 4.25 4.5 V
(typ. value = 0.5 VP)
Internal resistance of
voltage source R8−−5Ω
Available output current −I82−−mA
+I80.6 −−mA
Output short-circuit current −I8sc −8−mA
(typ. value = VP/1 kΩ)
Reference current source
Reference voltage V17-18 −3.6 −V
(typ. value = V8-18−VBE)
Internal biasing resistor Ri17 −5−kΩ
Allowable range of external
reference resistor R17-18 180 −270 kΩ
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
May 1992 6
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
APPLICATION INFORMATION (Fig.1)
Notes
1. Sequence for measuring switch-on delay times (tdon)
a) Nominal BK or DK input signal at pin 13: Vi(p-p) = 8 mV; f = 57 kHz; modulation-on.
b) Pin 4 of the BK detector (pin 16 of the DK detector) is switched to ground to cause a low signal at the SK output
at pin 3 (DK output at pin 2).
c) tdon commences when the ground connection is removed from pin 4 (pin 16) as the positive-going VoBK signal at
pin 5 (VoDK signal at pin 15) crosses zero.
tdon ends when the positive-going edge of the SK output arrives at pin 13 (DK at pin 2).
2. Sequence for measuring switch-off delay times (tdoff)
a) Nominal operating conditions as in note 1.
b) tdoff commences when the input is switched off as the negative-going VoBK signal at pin 5 (V oDK signal at pin 15)
crosses zero.
tdoff ends when the negative-going edge of the SK output arrives at pin 3 (DK at pin 2).
PARAMETER SYMBOL APPLICATION UNIT
SK switch-on threshold
level at mBK = 60% ViSKon typ. 1.8 mV
SK switch-on threshold
level at ViSK = 8 mV mBKon typ. 32 %
> 3.0 dB
SK switch hysteresis typ.
<3.5
4.0 dB
dB
SK switch-on delay typ. 95 ms
(note 1) tdSKon < 130 ms
SK switch-off delay > 380 ms
(note 2) tdSKoff typ. 500 ms
< 620 ms
DK switch-on threshold
level at mDK = 30% ViDKon typ. 1.5 mV
DK switch-on threshold
level at ViDK = 8 mV mDKon typ. 13 %
> 3.1 dB
DK switch hysteresis typ.
<3.6
4.1 dB
dB
DK switch-on delay typ. 750 ms
(note 1) tdDKon < 1000 ms
DK switch-off delay > 600 ms
(note 2) tdDKoff typ. 750 ms
< 1000 ms
mBKon
mBKoff
-----------------
mDKon
mDkoff
-----------------
May 1992 7
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
L = 2.36 mH; QL = 70; C = 3.3 nF; fo = 57 kHz.
Pin numbers in parentheses are for TDA1579T,
other pin numbers are for TDA1579.
(1) fo= 55 Hz; Q = 1.9
(2) fo= 24 Hz; Q = 1.9
(3) fo= 125 Hz
Fig.1 Application diagram.
May 1992 8
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
Fig.2 BK signal voltage at pin 5 as a function of
frequency. Fig.3 DK signal voltage at pin 15 as a function of
frequency: fo = 125 Hz; Q ≈18.
Fig.4 Control characteristic of the SK amplifier at VP = 8.5 V, mBK = 60% and QL = 70.
May 1992 9
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
FILTER INFORMATION
Gain
Amplifier conditions: Go>> Gv and Go>>2⋅Q2
, in which p = jω and Gv=.
Recommended components
GENERAL EQUATION C1 = C2 = C C1 = C2 = C
R2 < < R1
Resonance frequency ωr =
Gain at ω=ωr−Gvr =
Quality Q=
C1, C2 metallized polycarbonate film (MKC) capacitors; ±5%
and
R1, R2, R3 metal film (MR) resistors; ±2%
or
C1, C2 metallized polyester film (MKT) capacitors; ±5%
and
R1, R2, R3 carbon film (CR) resistors; ±2%
Gv
p
R1 C1⋅
--------------------
p2pC1 C2+
R3 C1 C2⋅⋅
--------------------------------- R1 R2+
R1 R2 R3 C1 C2⋅⋅⋅⋅
----------------------------------------------------------
++
-------------------------------------------------------------------------------------------------------------------
–= Vo
Vi
------
1
R1 R2⋅
R1 R2+
---------------------- R3 C1 C2⋅⋅⋅
----------------------------------------------------------------- 1
CR1 R2⋅
R1 R2+
---------------------- R3⋅
-------------------------------------------- 1
CR2R3⋅
-----------------------------
C2
C1 C2+
---------------------- R3
R1
--------
⋅1
2
--- R3
R1
--------
⋅1
2
--- R3
R1
--------
⋅
C1 C2⋅
C1 C2+
------------------------ R3 R1 R2+()
R1 R2⋅
--------------------------------------⋅1
2
--- R3 R1 R2+()
R1 R2⋅
-------------------------------------- 1
2
--- R3
R2
--------
⋅
May 1992 10
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
PACKAGE OUTLINES
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
SOT102-1 93-10-14
95-01-23
UNIT A
max. 12 b
1(1) (1) (1)
b2cD E e M Z
H
L
mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
min. A
max. bmax.
w
ME
e1
1.40
1.14 0.53
0.38 0.32
0.23 21.8
21.4 6.48
6.20 3.9
3.4 0.2542.54 7.62 8.25
7.80 9.5
8.3 0.854.7 0.51 3.7
inches 0.055
0.044 0.021
0.015 0.013
0.009
1.40
1.14
0.055
0.044 0.86
0.84 0.26
0.24 0.15
0.13 0.010.10 0.30 0.32
0.31 0.37
0.33 0.0330.19 0.020 0.15
MH
c
(e )
1
ME
A
L
seating plane
A1
wM
b1
b2
e
D
A2
Z
18
1
10
9
b
E
pin 1 index
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
DIP18: plastic dual in-line package; 18 leads (300 mil) SOT102-1
May 1992 11
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZ
ywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm
inches
2.65 0.30
0.10 2.45
2.25 0.49
0.36 0.32
0.23 13.0
12.6 7.6
7.4 1.27 10.65
10.00 1.1
1.0 0.9
0.4 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
1.1
0.4
SOT163-1 92-11-17
95-01-24
10
20
wM
bp
detail X
Z
e
11
1
D
y
0.25
075E04 MS-013AC
pin 1 index
0.10 0.012
0.004 0.096
0.089 0.019
0.014 0.013
0.009 0.51
0.49 0.30
0.29 0.050
1.4
0.055
0.42
0.39 0.043
0.039 0.035
0.016
0.01
0.25
0.01 0.004
0.043
0.016
0.01
0 5 10 mm
scale
X
θ
A
A1
A2
HE
Lp
Q
E
c
L
vMA
(A )
3
A
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
May 1992 12
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
“IC Package Databook”
(order code 9398 652 90011).
DIP
SOLDERING BY DIPPING OR BY WAVE
The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (Tstg max). If the
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.
REPAIRING SOLDERED JOINTS
Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.
SO
REFLOW SOLDERING
Reflow soldering techniques are suitable for all SO
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
WAVE SOLDERING
Wave soldering techniques can be used for all SO
packages if the following conditions are observed:
•A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
•The longitudinal axis of the package footprint must be
parallel to the solder flow.
•The package footprint must incorporate solder thieves at
the downstream end.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
REPAIRING SOLDERED JOINTS
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.
May 1992 13
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions TDA1579
TDA1579T
DEFINITIONS
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
Data sheet status
Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
