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TDA4480-C Datasheet(PDF) 2 Page - TEMIC Semiconductors

Part # TDA4480-C
Description  Multi standard quasi parallel-sound processor for TV-sets
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Manufacturer  TEMIC [TEMIC Semiconductors]
Direct Link  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

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TELEFUNKEN Semiconductors
TDA 4480-C
2
Preliminary Information
Pin Configuration
Pin
Symbol
Function
1–2
Vision-IF-carrier input
3
Intercarrier input 5.74 MHz
4
AGC time constant
5
Intercarrier output 5.74 MHz
6
Standard switch
7
AF output 1
8-9
Phase tank circuit 5.74 MHz
10
VC0 tank circuit
Pin
Symbol
Function
11
Ground
12-13
Phase tank circuit 5.5 MHz
14
AF output 2
15
Intercarrier output 5.5 MHz
16
Supply voltage
17
Intercarrier input 5.5 MHz
18-19
Sound-IF-carrier input
20
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
Symbol
Value
Unit
Supply voltage
Pin 16
VS
10 to 13.5
V
Supply current
Pin 16
IS
80
mA
External voltage
Pin 6
Pin 1, 2, 3, 4, 5, 7, 8, 9, 12,
13, 14, 15, 17, 18, 19
Vext
Vext
VS
6
V
V
Power dissipation
(in soldered position)
Ptot
1
W
Junction temperature
Tj
125
_C
Ambient temperature range
Tamb
- 25 to + 70
_C
Storage temperature range
Tstg
- 25 to + 125
_C


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