TDA8349A [NXP]
Multistandard IF amplifier and demodulator; 多标准中频放大器器和解调器
| 型号： | TDA8349A |
| 厂家： | 
NXP |
| 描述： | Multistandard IF amplifier and demodulator |
| 文件： | 总17页 (文件大小：109K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
DATA SHEET
TDA8349A
Multistandard IF amplifier and
demodulator
February 1991
Product specification
File under Integrated Circuits, IC02
Philips Semiconductors
Product specification
Multistandard IF amplifier and
demodulator
TDA8349A
GENERAL DESCRIPTION
The TDA8349A is a multistandard IF amplifier and demodulator with AGC and AFC functions for television receivers.
The device has a video recognition circuit and a video switch for internal or external video for full SCART applications.
FEATURES
• Full-range gain-controlled wideband IF amplifier up to 60 MHz
• Wide-band video amplifier with good linearity and a class AB output stage to ensure a very low output impedance
• Supply independent video output level
• Small second harmonic IF output
• AGC circuit which operates on top sync level (negative modulation) or on white level (positive modulation) or on top
level (MAC) with reduced sensitivity for high sound carriers
• AFC circuit with an internal 90° phase shift circuit, a sample-and-hold circuit for negatively modulated signals to reduce
video dependent AFC information and an analog or digital output
• Video recognition possibility based on horizontal pulse duty cycles
• Video switch for selection of internal or external video signals
• Wide supply voltage range and ripple rejection
• Requires few external components
• Tuner AGC output for npn and pnp tuners
QUICK REFERENCE DATA
SYMBOL
V14-17
PARAMETER
supply voltage (pin 14)
supply current (pin 14)
IF input sensitivity (RMS value)
IF gain control range
CONDITIONS
MIN.
10.2
TYP.
12
MAX.
13.2
UNIT
V
I14
Vi = 10 mV
40
−
55
50
72
1.9
65
80
−
mA
µV
dB
V
V1-2(RMS)
Gv
66
1.7
V11-17(p-p)
video output voltage (peak-
to-peak value)
2.1
S/N
signal-to-noise ratio
Vi = 10 mV
54
10
61
−
dB
V
V8-17(p-p)
AFC output voltage swing
(peak-to-peak value)
−
11
ORDERING AND PACKAGE INFORMATION
PACKAGE
MATERIAL
plastic
EXTENDED
TYPE NUMBER
PINS
PIN POSITION
DIL
CODE
SOT146(1)
TDA8349A
20
Note
1. SOT146-1; 1996 November 29.
February 1991
2
Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
February 1991
3
Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
PINNING
PIN
1,2
DESCRIPTION
balanced IF inputs
3
tuner AGC starting point adjustment
tuner AGC output
4
5
AGC time constant
6
AFC on/off switch and sample-and-hold capacitor
video switch
7
8
AFC output Q1
9
AFC output Q2
10
11
12
13
14
15,16
17
18
19
20
video switch external input
video output
video switch internal input
video switch output
positive supply voltage
reference tuned circuit for demodulator
ground
mute output
coincidence filter
system switch
FUNCTIONAL DESCRIPTION
General
IF amplifier
The IF amplifier consists of three AC coupled differential
gain stages with adjustable feedback in the emitter. The
AC coupling allows simple biasing, cascades can be used
and no DC feedback is required. This provides a control
range above 70 dB with good linearity. The minimum input
signal to obtain the nominal output amplitude is
50 µV RMS.
The IC consists of the following parts as illustrated in Fig.1:
• Gain controlled video IF amplifier
• Quasi-synchronous demodulator
• Video amplifier/buffer with white spot clamp/inverter and
noise clamp
• AGC circuit which operates either on top sync level
(negative modulation) or on white level (positive
modulation) or on top level (MAC)
Demodulator
The demodulator is a quasi-synchronous circuit that
employs passive carrier regeneration and a tuned circuit
for selectivity. The regenerated carrier signal is limited by
a clamping circuit before it is fed to the demodulator.
Switching between positive and negative modulation is
achieved by the system switch which provides currents to
the demodulator in a positive or negative direction.
• AFC circuit with sample-and-hold circuit for negatively
modulated signals, on/off switch and a digital or analog
output (switchable)
• Circuit for switching between positive and negative
modulation
• Video recognition circuit for sound muting and tuning
Video amplifier
indication
• Video switch which facilitates selection between two
different video signals, with different gain settings
The video amplifier based on the feedback principle
improves the linearity of the video output buffer. It has an
internal bandgap reference to ensure a stable video output
at different supply voltages and temperatures. This
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
bandgap also reduces the supply ripple on the video
output to values less than −30 dB. The video amplifier has
a typical bandwidth of 10 MHz which allows application for
all new video standards with bandwidths of up to 10 to
12 MHz. The video output signal has an amplitude of
2 V (p-p). White spot protection comprises a white spot
clamp system combined with a delayed-action inverter
which is also highly resistant to high sound carriers. A
switchable DC shift for positively modulated IF signals
ensures correct signal handling. This switching is obtained
via pin 20, which is the same pin used for switching the
demodulation polarity in the demodulator.
The circuit also has a noise clamp which prevents the
video output becoming less than ±400 mV below the top
sync level at noise peaks. The output buffer of the video
amplifier consists of a class A/B circuit which can handle
large source as well as large sink currents. This makes the
circuit more flexible in several applications with one or
more ceramic filters connected to this output buffer.
current limiting is incorporated to prevent internal damage.
The AGC starting point is adjusted by a voltage between 3
and 5 V for pnp tuners and between 7 and 9 V for npn
tuners via pin 3.
AGC circuit
A new AGC system has been designed for the AGC. It will
be a top sync-detector for negatively modulated signals
and a top white level AGC for positively modulated signals.
For optimal flexibility reasons the load and unload currents
of the AGC are chosen such that both, a relatively fast set,
as well as a set with a low tilt are possible for positive (L)
and negative (B/G) modulated signals. For this reason a tilt
ratio between positive (L) and negative (B/G) of
approximately 3:1 has been chosen. This means that in a
fast set the choice of a typical tilt for negatively modulated
signals of 2% will obtain a typical tilt for positively
modulated signals (L) of 6%. For a digital set which
requires a small tilt the choice of tilt can be a factor of 5 or
10 smaller by increasing the AGC capacitor.
AGC control circuit
This converts the AGC detector voltage (pin 5) into a
current signal which controls the gain of the IF amplifier. It
also provides a tuner AGC control output from pin 4,
The chosen AGC currents:
MODE
UNLOAD CURRENT
LOAD CURRENT
TILT AT 2.2 µF
typ. 0.5% (line tilt)
B/G
L
50 µA
500 nA (note 1)
200 nA
1.5 mA
1.5 mA
1.5 mA
1.5 mA
typ. 1.5% (field tilt)
typ. 1.2% (frame tilt)
typ. 1.5% (field tilt)
MAC(positive)
MAC(negative)
500 nA
Note
1. As long as no signal has been identified by the identification detector the unload current will be 50 µA.
Switching between the first three modes can be achieved
by the system switch. This is a 3-level switch which when
grounded selects B/G; open or 5 V selects L, and with pin
20 connected to VCC selects positively modulated MAC.
The IC operates in a fourth mode if the identification
capacitor at pin 19 is connected to VCC, it can be used for
negatively modulated MAC.
During channel switching a situation can occur that
requires the AGC to increase the gain more than for
example 50 dB. If this increase of gain has to be done for
a positively modulated (L) signal, it will be achieved by the
500 nA load current and is therefore extremely slow.
Because the identification information can be used to
indicate that the signal is too small, in this event the
identification circuit will mute, it is possible to increase the
positive unload current to the same value as that used for
negatively modulated signals. This switching is fully
automatic and cannot be switched off.
AFC circuit
The AFC circuit consists of a demodulator stage which is
fed with signals 90° out of phase. A very accurate internally
realized 90° phase shift circuit makes it possible to use the
demodulator IF regenerator tuned circuit for tuning the
AFC circuit. To prevent video ripple on the AFC output
voltage a sample-and-hold circuit is used for negatively
modulated signals. The output signal of the demodulator is
sampled during sync level of the video signal and will be
stored with the aid of an external capacitor.
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
This sample-and-hold circuit is not used in the L mode, but
it will function as a low-pass filter in this mode and
therefore also reduces the video dependency of the AFC.
A gain stage amplifies the voltage swing by 5 times. The
output of the AFC circuit will be an inverse analog output
on pin 8 when pin 9 is connected to a voltage above 8 V. If
pin 9 is connected to a voltage above 10 V the output will
be a normal analog output. Normally pins 8 and 9 together
provide digital AFC information.
unloaded during the sync pulse. The maximum voltage at
this internal capacitor is a value for the main frequency of
the video signal. By changing the value of an external
capacitor it is possible to influence the speed and
sensitivity of the recognition circuit. It is possible to gain
sensitivity performance at disturbed signals by increasing
the value of the external capacitor, however this will
reduce the speed of the identification circuit.
Video switch circuit
Video recognition circuit
The video switch also provides application for full SCART
functions. The circuit has two inputs, one output and a
control pin. The switch selects either internal or external
video signals. A × 2 gain stage for the external input
provides an equal output level for internal or external video
from the SCART. The crosstalk of the unwanted signal is
better than −50 dB and the total signal handling meets all
the requirements for SCART specifications.
For full scart functions it is necessary to implement a
second mute function for non-video signals in the whole
television concept. This is realized in this IF-IC. With an
internal sync separator and an internal integrator it is
possible to achieve a very sensitive identification circuit,
which measures the mean frequency of the input signal.
This is normally approximately 16 kHz. The integrator
capacitor will be loaded during the whole line time and
LIMITING VALUES
In accordance with the Absolute Maximum System (IEC 134)
SYMBOL
V14-17
PARAMETER
MIN.
MAX.
UNIT
supply voltage (pin 14)
total power dissipation
−0.5
−
13.2
1.2
V
Ptot
W
°C
°C
Tstg
Tamb
storage temperature range
−25
−25
+150
+ 75
operating ambient temperature range
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
CHARACTERISTICS
VP = 12 V; Tamb = 25 °C; carrier frequency 38.9 MHz; negative modulation; unless otherwise specified.
SYMBOL
supply
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V14-17
I14
IF amplifier (note 1)
supply voltage (pin 14)
10.2
12
13.2
65
V
supply current
Vi = 10 mV
40
55
mA
V1-2
input sensitivity
note 2
note 3
note 3
−
50
2
80
−
µV
kΩ
pF
dB
R1-2
C1-2
∆G1-2
∆V11
differential input resistance
differential input capacitance
gain control range
−
−
2
−
66
72
−
output signal for 50 dB input signal
variation
−
0.5
−
dB
note 4
note 6
V1-2
f1-2
maximum input signal
100
60
−
−
−
−
mV
maximum operating frequency
MHz
Video output (note 5)
zero signal output level
V11
negative modulation
−
−
−
−
4.75
2.65
2.7
−
−
−
−
V
V
V
V
V11
positive modulation
V11
top sync level (top sync AGC)
white level (white level AGC)
note 7
note 8
V11
4.6
V11(p-p)
amplitude of video output signal (peak-
to-peak value)
1.7
1.9
2.1
V
V11
V11
V11
V11
V11
Z11
I11
amplitude difference (positive/negative)
video output voltage variation
white spot threshold level
white spot insertion level
noise clamping level
−
0
10
−
%
∆VP = 1 V
see Fig.3
see Fig.3
see Fig.3
−
−30
5.6
3.8
2.3
−
dB
V
−
−
−
−
V
−
−
V
output impedance
−
10
10
10
−
Ω
maximum sink current
5
−
mA
mA
MHz
%
I11
maximum source current
bandwidth of demodulated output signal
differential gain
5
−
B11
Gd
ϕd
7.5
−
10.0
2
note 9
note 9
note 10
−
differential phase
−
7
−
deg
%
Ynl
luminance non-linearity
−
2
5
intermodulation
1.1 MHz blue
1.1 MHz yellow
3.3 MHz blue
3.3 MHz yellow
see Figs 6 and 7
α
α
α
α
−
−
−
−
−66
−60
−60
−60
−
−
−
−
dB
dB
dB
dB
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
SYMBOL
PARAMETER
signal-to-noise ratio
CONDITIONS
MIN.
TYP.
MAX.
UNIT
note 11
S/N
Vi = 10 mV
minimum gain
54
61
−
dB
S/N
60
66
10
−
dB
V1(rms)
V11(rms)
residual carrier signal (RMS value)
−
20
mV
residual 2nd harmonic of carrier signal (RMS
value)
−
3
10
mV
System switch (note 12)
V20
I20
maximum voltage for mode B/G
1.4
−
−
−
−
3
−
V
input current
V20 = 0 V
−300
µA
V
V20
V20
I20
minimum voltage for mode L
maximum voltage for mode L
input current
−
−
−
7
V
3 V ≤ pin
20 ≤ 7 V
−150
−
250
µA
V20
I20
minimum voltage for MAC (positive)
input current
−
−
−
9.5
V
V20 = VP
500
−
µA
AGC control circuit
t11 response to an amplitude increase of
52 dB of the IF input with the AGC
switched to mode B/G
note 13
note 14
−
−
2
−
−
ms
ms
t11
response to an amplitude decrease of
52 dB of the IF input with the AGC
switched to mode B/G
25
allowed leakage current of the AGC
capacitor
I5
I5
I5
I5
top sync level AGC
white level AGC
−
−
−
−
10
−
−
−
−
µA
nA
nA
nA
200
50
positive MAC AGC
negative MAC AGC
200
Tuner AGC (note 15)
input voltage for tuner AGC starting
point
IF input = 200 µV; negative slope
V3
V3
V3
V3
I4
3.0
−
3.5
5.0
7.5
9.0
−
V
V
V
V
IF input = 100 mV; negative slope
IF input = 200 µV; positive slope
IF input = 100 mV; positive slope
5.5
−
7.0
−
9.5
maximum current swing of tuner AGC
output
3
5
−
mA
V4
I4
output saturation voltage
I4 = 2 mA
−
−
300
1
mV
µA
dB
leakage current
−
−
∆Vi
input signal variation complete tuner control
0.5
2.0
4.0
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V3
minimum tuner take over voltage
−
−
1
V
Video switching circuit
EXTERNAL VIDEO INPUT (AC coupled)
V10(p-p)
I10
input signal voltage (peak-to-peak value)
VO = 2 V(p-p)
I10 = 1 mA
−
−
−
1.0
3.5
3.3
−
−
−
V
input current
µA
V10
top sync clamping level
V
INTERNAL VIDEO INPUT (DC coupled)
V12(p-p)
|Z12|
input signal voltage (peak-to-peak value)
VO = 2 V(p-p)
−
−
−
2.0
2.0
3.3
−
−
−
V
input impedance
kΩ
V
V12
black level input voltage
VIDEO OUTPUT
V13(p-p)
output signal voltage (peak-to-peak
value)
−
2.0
−
V
V13
V13
I13
top sync level
−
−
2.7
2.5
−
−
V
V
noise clamping voltage level
I13 = 1 mA
internal bias current of npn emitter follower
output transistor
−
1.5
−
mA
I13
maximum source current
bandwidth of output signal
5
−
10
mA
B13
−
5
−
MHz
crosstalk of video signal
external to internal
internal to external
note 16
α
α
−
−
60
55
55
50
dB
dB
VIDEO SWITCH INPUT (note 17)
V7
V7
I7
maximum voltage for external video
signal
−
−
−
2
V
V
minimum voltage for internal video
signal
1
−
minimum source current for internal
video signal
−
−
−
−
300
µA
I7
input current
V7 = 0 V
−1
mA
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
µA
I7
input current
V7 = VP
−
−
−
−
3
AFC circuit (note 18)
AFC SAMPLE-AND-HOLD/SWITCH (note 19)
AFC switch:
I6
current level below which AFC outputs
switches off
−500
µA
I6
I6
maximum AFC switch current
maximum leakage current
V6 = 0 V
−
−
−
−
−1
mA
1
µA
AFC ANALOG OUTPUT (V9 > 8 V; see Figs 4 and 5)
V8(p-p)
output voltage swing (peak-to-peak
value)
10
−
−
11
V
I8
maximum output current
500
−
µA
control steepness
AFC output voltage
60
5
75
6
100
7
mV/kHz
V
V8
AFC off
AFC DIGITAL OUTPUT (see Table 1)
V8,9
V8,9
∆f
output voltage LOW
output voltage HIGH
−
−
−
0.5
5.5
V
V
50 kΩ load
4.5
frequency swing for switching AFC
output Q1
65
80
100
kHz
I8,9
maximum allowable output current
500
−
−
µA
AFC Analog SWITCH (note 20)
I9
minimum sink current for analog AFC
−
−
1.5
10.2
8.0
−
mA
V
V9
V9
V9
I9
minimum voltage for negative slope
minimum voltage for positive slope
maximum voltage for positive slope
output current
−
−
−
−
V
10.2
−
−
V
V9 = VP
500
150
−
µA
µA
I9
output current
V9 = 8 to 10 V
−
−
Video transmitter identification output (note 21)
V18
output voltage active
no sync;
I
18 = 1 mA
−
−
0.3
0.5
3
V
I18
td
output current inactive
sync
−
µA
delay time of mute release after sync
insertion
−
−
−
−
10
50
ms
nA
I19
allowed leakage current of identification
detector capacitor
February 1991
10
Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
Notes
1. All input signals are measured in RMS values at 100% carrier level and a frequency of 38.9 MHz.
2. On set AGC.
3. Input impedance selected so that a SAW filter can be applied without extra components.
4. Measured with 0 dB = 200 µV.
5. Measured at 10 mV(RMS) top sync input signal and the video output unloaded.
6. Projected zero point with internally switched demodulator.
7. With the AGC switch switched to ground, for the B/G standard, or with the identification capacitor switched to VCC
for the negative MAC standard.
8. With the AGC switch switched open for the L standard, or switched to VCC for the positive MAC standard.
9. Measured in accordance with the test line given in Fig.8.
-
The differential gain is expressed as a percentage of the difference in peak amplitudes between the largest and
smallest value relative to the subcarrier amplitude at blanking level.
-
The differential phase is defined as the difference in degrees between the phase angle of the 4.4 MHz signal at
20% and 80% luminance signal.
10. Measured in accordance with the test line shown in Fig.9.
The non-linearity is measured by comparing the differences between adjacent pairs of six luminance levels that make
up the 5 step staircase. The measurement result is the largest percentage deviation in adjacent step values. The sign
is always positive.
Vo black-to white
11. Measured with a 75 Ω source:S ⁄ N = 20 log---------------------------------------------------------------
Vn (RMS) at B = 5 MHz
12. The internal circuit of pin 20 behaves as an internal voltage source of 4.5 V with an input resistance of 15 kΩ. Using
the system switch three conditions can be obtained:
Negative modulation with top sync level AGC. This is achieved with pin 20 connected to ground.
Positive modulation with white level AGC. This is achieved with pin 20 open, or connected to 5 V.
Positive modulation with top white AGC and an increased time constant for MAC signals. This is achieved with pin
20 connected to VCC
.
13. Measured with a capacitor of 2.2 µF connected to pin 5. A step is made from 200 µV to 80 mV input signals.
14. Measured with a capacitor of 2.2 µF connected to pin 5. A step is made from 80 mV to 200 µV input signals.
15. It is possible to adjust the tuner AGC over the whole AGC range of the IF amplifier for both pnp and npn tuners. Tuner
AGC starting point is defined as an output current of 0.2 mA for pnp and 1.8 mA for npn, in an application with a
resistance of 6 kΩ to VP at pin 4.
Vounwanted video black-to-white
16. Crosstalk is defined as:20 log
measured at 4.4 MHz
---------------------------------------------------------------------------------------
Vowanted video black-to-white
17. The video switch is controlled by a voltage on pin 7. The switching level is approximately 1.4 V. With pin 7 open-circuit
internal video is selected; with pin 7 pulled to ground external video is selected.
18. Measurement taken with an input 10 mV(RMS). The unloaded Q factor of the reference tuned circuit is 70.
19. Switching off the AFC is obtained by a voltage of less than 2 V on pin 6. Normally this is achieved by pulling pin 6 to
ground.
20. Switching to the normal analog AFC mode can be done by pulling pin 9 to a voltage above 10.2 V. Normally this is
achieved by pulling pin 9 to VP.
The inverse analog AFC mode can only be obtained by a voltage of between 8 and 10 V applied to pin 9.
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
21. All timing figures defined with a capacitor of 2.2 nF at pin 19. The identification can be speeded up by lowering the
value of this capacitor, however this makes the circuit also less sensitive if the video signal is disturbed (airplane
flutter etc.). If the identification is only used as a sound mute a capacitor of 47 nF is recommended to improve the
sensitivity.
Fig.2 Signal-to-noise ratio as a function of video input.
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
Fig.3 Video waveform showing white spot threshold and insertion levels, and noise clamping levels
Fig.4 Analog AFC output voltage as a function of
frequency pin 9 above 10 V.
Fig.5 Analog AFC output voltage as a function of
frequency pin 9 above 10 V.
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
Table 1 Digital AFC truth table
INPUT FREQUENCY
Q1
Q2
> IF +40 kHz
> IF
0
1
1
0
1
1
0
0
< IF
< IF −40 kHz
SC = sound carrier
CC = chrominance carrier
PC = picture carrier
all with respect to top sync level
Fig.6 Input conditions for intermodulation measurements; standard colour bar with 75% contrast.
Fig.7 Test set-up intermodulation measurements.
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
Fig.8 Video output signal.
Fig.9 E.B.U. test signal wave form (line 330).
February 1991
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Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
PACKAGE OUTLINE
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
D
M
E
A
2
A
A
1
L
c
e
w M
Z
b
1
(e )
1
b
M
H
20
11
pin 1 index
E
1
10
0
5
10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
(1)
A
A
A
(1)
(1)
Z
1
2
UNIT
mm
b
b
c
D
E
e
e
1
L
M
M
H
w
1
E
max.
min.
max.
max.
1.73
1.30
0.53
0.38
0.36
0.23
26.92
26.54
6.40
6.22
3.60
3.05
8.25
7.80
10.0
8.3
4.2
0.51
3.2
2.54
0.10
7.62
0.30
0.254
0.01
2.0
0.068
0.051
0.021
0.015
0.014
0.009
1.060
1.045
0.25
0.24
0.14
0.12
0.32
0.31
0.39
0.33
inches
0.17
0.020
0.13
0.078
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
92-11-17
95-05-24
SOT146-1
SC603
February 1991
16
Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
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).
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.
DEFINITIONS
Data sheet status
Objective specification
Preliminary specification
Product specification
This data sheet contains target or goal specifications for product development.
This data sheet contains preliminary data; supplementary data may be published later.
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.
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.
February 1991
17
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