Siemens TDA5931-65 Datasheet
Video IF Amplifier and Demodulator
with Full-SCART
Features
● Multistandard video IF
● Interference suppression circuitry
● Mean/peak value control
● Area of application: TV set with Full-SCART
P-DIP-18
Type Ordering Code Package
TDA 5931-65 Q67000-A5136 P-DIP-18
TDA 5931-65
Bipolar IC
Functional Description
Video IF for all European standards for positive and negative modulation. The video section
contains a Full-SCART interface. An output for the demodulated video signal (pin 9) allows the
insertion of a sound trap into the signal path to the input or the SCART switch and the SCART output
buffer amplifier (pin 7). The analog setting function (delayed AGC threshold) is controlled via a
potentiometer, all other switch functions are controlled via open-collector transistors.
Circuit Description
The component includes a four-stage, capacitively coupled, symmetrically designed and controlled
amplifier, a limiter with selection, and a mixer for quasi-synchronous demodulation of positive and
negative modulated IF signals. In addition a video output amplifier and noise suppression circuitry
are included. This output is used for generating the AGC voltage. The AGC for both modulation
types has been realized as integral AGC with noise free peak and mean value detector (only for
positive modulation). For SCART applications this output is switched a video source switch with two
inputs (for the demodulator signal or SCART socket) and two outputs (SCART- and TV output). The
demodulator output (pin 9) provides a video signal output level 3 dB higher than the level required
for the operation of the TV set or to drive the SCART connector. Therefore it is possible to insert a
sound trap in between this output and the input of the SCART switch (pin 7). The insertion loss of
the sound trap has to attenuate the signal level at pin 9 by a factor 2/3 or 3 dB (AC and DC) to avoid
distortions in the SCART switch.
The delayed tuner AGC is generated by a threshold amplifier driven by the control voltage. The
amplifier response can be controlled by means of an external potentiometer. (The increase of the
tuner AGC voltage shall create a higher tuner gain = positive control).
Semiconductor Group 31 06.94
Pin Functions
Pin No. Function
1 Video IF input
2 SCART switch A/W
3 SCART input
4 SCART input/output
TDA 5931-65
5+
6 Positive video output
7 Video output of the sound trap (2 Vpp)
8 Ground
9 Video input of the sound trap (3 Vpp)
10 Demodulator tank circuit
11 Demodulator tank circuit
12 TV-standard switch-over (B/G) – (L)
13 Low-pass filter (averaging)
14 Tuner AGC threshold
15 Tuner AGC output
16 AGC-time constant
17 Ground
18 Video IF input
V
supply voltage
S
Semiconductor Group 32
TDA 5931-65
Block Diagram
Semiconductor Group 33
TDA 5931-65
Absolute Maximum Ratings
T
= 0 to 70 °C
A
Parameter Symbol Limit Values Unit
min. max.
Sound trap input
Demodulator output
Demodulator output
Supply voltage
SCART A/W
Pos. video output
Pos. video output
Demodulator tank circuit
SCART OUT
SCART OUT
Tuner AGC threshold
Tuner AGC output
IF input
IF control
Norm switch-over
Norm switch-over
SCART IN
Junction temperature
Storage temperature
Thermal resistance (system-air)
V
7
V
9
I
9
V
5
V
2
I
6
V
6
V10/V
I
4
V
4
V
14
V
15
V1/V
V
16
V
12
V
13
V
3
T
j
T
stg
T
th SA
18
11
3.3 8.5 V
0 V
5
V
– 3 10 mA
0 13.2 V
06V
– 3 5 mA
0 8.5 V
0 V
5
V
– 3 5 mA
0 V
5
V
06V
010V
06V
0 8.5 V
06V
06V
06V
150 ˚C
– 40 125 ˚C
70 K/W
Operating Range
Supply voltage
Supply voltage delayed tuner AGC
Ambient temperature during operation
Input frequency range – 3 dB
Input frequency range – 0.3 dB
V
5
V
15
T
A
f
IF
f
IF
10.8 13.2 V
1.5 13.2 V
070˚C
10 100 MHz
30 75 MHz
All voltage values are referenced to ground, if not stated otherwise.
The current are identified according to the source/sink principle. If the IC considered a sink (the
current flows from the respective pin to ground), it is identified by a negative algebraic sign.
However, if the IC is the source (the current flows from VB via the respective pin to ground), it is
identified by a positive algebraic sign.
Semiconductor Group 34
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