TDA4482-D
TELEFUNKEN Semiconductors
Rev. A1, 29-Aug-96
1 (7)
Quasi-Parallel Sound Processor for TV Sets
Technology: Bipolar
Features
D High signal sensitivity
D Simple filter configuration and few external
components
D Processing of two carrier stereo signals
D ESD protected
D Low intercarrier distortions
D Alignment-free intercarrier mixer
D Optimum tuning characteristics
D Improved linearity for NICAM applications
D AF output level matched to SIMAVELEC condition
Case: DIP18
Block Diagram
Figure 1.
TDA4482-D
TELEFUNKEN Semiconductors
Rev. A1, 29-Aug-96
2 (7)
Pin Configuration
Pin
Function
12
Vision-IF-carrier input
3
Intercarrier input 5.74 MHz
4
AGC storage capacitor
5
Intercarrier output 5.74 MHz
6
AF output 1
78
FM demod circuit 5.74 MHz
9
Ground
Pin
Function
1011 FM-demode circuit 5.5 MHz
12
AF output 2
13
Intercarrier output 5.5 MHz
14
Supply voltage
15
Intercarrier input 5.5 MHz
1617 Sound-IF-carrier input
18
Not conneccted
Circuit Description
This circuit configuration permits high-quality
processing of audio carriers for FM-sound standards,
providing separate inputs for the video and audio carrier.
The audio carrier signal is passed to two multiplying
mixer arrangements via a 3-stage variable wideband
amplifier with led level output signals. One mixer
generates the gain-control signal. The second mixer
operates as an intercarrier demodulator and supplies the
intermediate AF carrier. The video carrier signal required
from the intercarrier is decoupled in a prelimited and se-
lected form from the demodulator tank of the
intermediate video frequency circuit (TDA4453 or
TDA4439) and led to the intercarrier mixer via a limiting
amplifier. Depending on the system, the Nyquist range of
the IF input filter in the video channel affects the
attainable AF signal-to-noise ratio.
The audio PM IF carrier reaches the quadrature demodu-
lators via an inter-connected IF filter and subsequent
limiting amplifier. The resulting AF signals are led via a
low-pass amplifier with increased level to the buffered
output stages. Switching can take place with TTL-
equivalent levels.
Absolute Maximum Ratings
Reference point Pin 9, 18, unless otherwise specified
Parameters
Symbol
Value
Unit
Supply voltage
Pin 14
V
S
10 to 13.5
V
Supply current
Pin 14
I
S
80
mA
External voltages
Pins 1, 2, 3, 4, 5, 7, 8, 10, 11, 12, 13, 15, 16 and 17
V
ext
6
V
Power dissipation (in soldered position)
P
tot
1
W
Junction temperature
T
j
125
C
Ambient temperature range
T
amb
25 to +70
C
Storage temperature range
T
stg
25 to +125
C
Thermal Resistance
Parameters
Symbol
Maximum
Unit
Junction ambient
R
thJA
60
K/W
TDA4482-D
TELEFUNKEN Semiconductors
Rev. A1, 29-Aug-96
3 (7)
Electrical Characteristics
V
S
=
12 V, T
amb
= 25
C, reference point Pin 9, f
PC
= 38.9 MHz, f
SC1
= 33.43 MHz, f
SC2
= 33.1578 MHz,
SC1/SC2 = 7 dB, unless otherwise specified
Parameters
Test Conditions / Pin
Symbol
Min
Typ
Max
Unit
Supple voltage range
Pin 14
V
S
10
13.5
V
Supply current
Pin 14
I
S
55
62
80
mA
Output dc voltage
Pin 6, 12
V
0
3.6
V
Picture carrier input voltage
Pin 12
v
10
20
30
mV
Min. sound carrier input
voltage SC1
(5.5 MHz-output signal
3 dB)
Pin 1617
v
50
mV
AGC range
60
65
dB
Audio output voltage
FM deviation
=
27 kHz,
Pin 6, 12
v
500
mV
Audio-voltage difference
between both outputs
Pin 6, 12
Dv
AF
1
dB
Harmonic distortion
1)
f
mod
=
1 kHz,
FM deviation = 30 kHz
Pin 6, 12
THD
0.5
%
Limiting threshold
(V
AF
3
dB)
250
mV
AM rejection
f
mod
= 1 kHz, m
=
30%
3)
V
3(15)
=10 mV,
f= 5.5 (5.74) MHz
55
dB
FM amplifier input
resistance
R
3,15
560
W
Min. output load
Pin 6,12
R
3
k
W
Signal-to-noise ratio (standard B/G) according to CCIR 468-2 specifications v
1617
: SC1 = 10 mV, SC2 = 4.5 V
PC: v
12
= 20 mV, prelimited demodulator picture carrier signal from TDA4453
Black burst
1. channel/ 2. channel
2,3)
Pin 6,12
(S+N)/N
62/60
dB
Grid test signal
1. channel/ 2. channel
2,3)
Pin 6,12
(S+N)/N
50/48
dB
1)
FM tank circuits: operation quality factor = 22
2)
Standard B/G IF-modulated FBAS signal
3)
Reference signal: f
mod
= 1 kHz, FM deviation = 30 kHz
TDA4482-D
TELEFUNKEN Semiconductors
Rev. A1, 29-Aug-96
4 (7)
Figure 2. Pin 1, 2: IF input vision carrier
Figure 3. Pin 3 (15): Intercarrier input
Pin 3 = 5.74 MHz, Pin 15 = 5.5 MHz
Figure 4. Pin 4: AGC storage capacitor
Figure 5. Pin 5 (13): Intercarrier output
Pin 5 = 5.74 MHz, Pin 13 = 5.5 MHz
Figure 6. Pin 12: AF output 2
TDA4482-D
TELEFUNKEN Semiconductors
Rev. A1, 29-Aug-96
5 (7)
Figure 7. Pin 6: AF output 1
Figure 8. Pin 7, 8 (10, 11) FM demodulator circuit
Pin 7,8 = 5.74 MHz, Pin 10, 11 = 5.5 MHz
Figure 9. Pin 16, 17: IF input sound carrier
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