TELEFUNKEN Semiconductors
TDA 4480-C
Multi standard quasi parallel-sound processor for TV-sets
Technology:
Bipolar
Features
D
High signal sensitivity
D
Simple filter
components
configuration
and
few
external
D
ESD protected
D
Alignment free AM demodulator for the standard L
D
VCO controlled mixer stage converts intercarrier
frequencies of different standards into a preferred
sound IF
D
Optimum tuning characteristic
D
Processing of two carrier stereo signals
D
Low intercarrier distortions
Case:
20-pin dual inline plastic
Figure 1 Block diagram
Preliminary Information
1
TDA 4480-C
Pin Configuration
Pin
1–2
3
4
5
6
7
8-9
10
Symbol
Function
Vision-IF-carrier input
Intercarrier input 5.74 MHz
AGC time constant
Intercarrier output 5.74 MHz
Standard switch
AF output 1
Phase tank circuit 5.74 MHz
VC0 tank circuit
Pin
11
12-13
14
15
16
17
18-19
20
Symbol
TELEFUNKEN Semiconductors
Function
Ground
Phase tank circuit 5.5 MHz
AF output 2
Intercarrier output 5.5 MHz
Supply voltage
Intercarrier input 5.5 MHz
Sound-IF-carrier input
n.c.
Circuit Description
The integrated circuit allows the high quality processing of sound carrier for different TV standards. The circuit requires
separate vision and audio carrier inputs. It delivers the output audio signal for mono, two channels or stereo applications.
Audio carrier signal (simple or double carrier, FM and AM) is applied via three stage AGC controlled broad band amplifier
which delivers regulated output signal for two mixing stages. One mixer works for AM-demodulation and AGC-function
whereas the second mixer produces the sound intercarrier IF-frequencies (5.5/5.74 MHz).
Vision carrier signal for the intercarrier generation is delivered from the demodulator tank of the video IF circuit (TDA
4439, TDA 4453). It is then matched via a limiter stage to the FM intercarrier mixer. FM-sound-IF-carrier reaches the
quadrature demodulator via the selection circuit and the following limiter amplifier. The final audio signal is supplied
to the low ohmic output (Pin 7,14) with low pass filter character.
There is a switchable converter for different audio standards (4.5, 6.00 and 6.5 MHZ), which mixes the sound 1P-signal
properly e.g. at 5.5 MHz. The VC0 (Pin 10) must be controlled across the sound output (Pin 7) which includes
AFC-function.
Sound signal at the AM-modulation is introduced via standard switch in the first sound channel, whereas the intercarrier,
converter section and both FM demodulators are switched off. In case of sound IF converter operation, the second sound
channel and the AM-section are switched off. The standard mode is controlled by a tristate signal on Pin 6.
Absolute Maximum Ratings
Reference point Pin 11, unless otherwise specified
Parameters
Supply voltage
Supply current
External voltage
Pin 16
Pin 16
Pin 6
Pin 1, 2, 3, 4, 5, 7, 8, 9, 12,
13, 14, 15, 17, 18, 19
Symbol
V
S
I
S
V
ext
V
ext
P
tot
T
j
T
amb
T
stg
Value
10 to 13.5
80
V
S
6
1
125
- 25 to + 70
- 25 to + 125
Unit
V
mA
V
V
W
_
C
_
C
_
C
Power dissipation
(in soldered position)
Junction temperature
Ambient temperature range
Storage temperature range
2
Preliminary Information
TELEFUNKEN Semiconductors
TDA 4480-C
Symbol
R
thJA
Value
60
Unit
K/W
Thermal Resistance
Parameters
Junction ambient
Electrical Characteristics
V
5
= 12 V, T
amb
= 25
_
C, reference point pin 11, f
PC
= 38.9 MHz, f
SC1
= 33.4 MHz, f
SC2
= 33.1578 MHz,
SC1/SC2 = 7 dB, unless otherwise specified
Parameters
Supply voltage range
Supply current
Output DC voltage
Standard switching voltage
Test Conditions / Pin
Pin 16
FM-operation,
AM-operation,
Pin 16
Pin 16
Pin 7,14
Symbol
V
S
I
S
I
S
V
0
V
V
V
I
v
v
v
1.7
0
3.5
5
Min
10
Type
65
40
3.5
2.2
2.7
1.5
V
S
20
20
Max
13.5
Unit
V
mA
mA
V
V
V
V
mA
mV
mV
mV
dB
mV
eff
"1
0.5
1.5
3
3.0
dB
%
%
kW
Standard B/G,
Pin 6
Standard L,
Pin 6
converter operation Pin 6
Standard switching current
V
6
x
5 V
Pin 6
Picture carrier input voltage
Pin 1,2
Min. sound carrier input
5.5 MHz-output
Pin 18,19
voltage SC1
signal –3 dB
Max. sound carrier input
Pin 18,19
voltage SC1
AGC range
Audio output voltage
FM-deviation = 30 kHz
m = 80 %
Pin 7,14
Audio voltage difference
Pin 7,14
between both outputs
Harmonic distortion AM-
f
mod
= 1 kHz,
Pin 7,14
operation
FM-deviation = 30 kHz
Harmonic distortion AM-
f
mod
= 1 kHz,
Pin 7
operation
m = 80 %, v
18-19
= 10 mV
Min. output load
Pin 7,14
Signal to noise ratio (Standard B/G) according to
CCIR 468-2 specifications, SC1: v
18-19
= 10 mV,
PC: v
1-2
= 10 mV, prelimited demodulator picture carrier
signal from TDA 4453 reference signal: f
mod
= 1 kHz,
FM deviation = 30 kHz
Black burst
1. channel/2. channel
1)
Grid test signal
1. channel/2. channel
1)
Converter
DC voltage
Tuning range
Input resistance
Input capacity
Pin 7/14
Pin 7/14
10
50
100
65
500
v
v
d
d
R
(S=N)/N
(S=N)/N
62/60
50/48
dB
dB
V
6
y
3.5 V
Pin 10
Pin 10
Pin 10
Pin 10
V
10
f
R
C
2.7
9
100
12
13
V
MHz
kW
pF
Preliminary Information
3
TDA 4480-C
Parameters
Test Conditions / Pin
Signal to noise ratio (Standard B/G) according to
CCIR 468-2 specifications, SC1: v
18-19
= 10 mV,
PC: v
1-2
= 10 mV, prelimited demodulator picture carrier
signal from TDA 4453 reference signal: f
mod
= 1 kHz,
FM deviation = 30 kHz
Black burst
1. channel/2. channel
1)
Grid test signal
1. channel/2. channel
1)
Converter
DC voltage
V
6
y
3.5 V
Tuning range
Input resistance
Input capacity
1)
Standard B/G IF-modulated FBAS-signal
Pin 7/14
Pin 7/14
Symbol
TELEFUNKEN Semiconductors
Min
Type
Max
Unit
(S=N)/N
(S=N)/N
62/60
50/48
dB
dB
Pin 10
Pin 10
Pin 10
Pin 10
V
10
f
R
C
2.7
9
100
12
13
V
MHz
kW
pF
Figure 2: Test circuit
4
Preliminary Information
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