TDA4481 [TEMIC]
Multistandard quasi parallel-sound processor for Mono-TV-Sets; 多标准准平行声音处理器为单声道的电视机
| 型号： | TDA4481 |
| 厂家： | 
TEMIC SEMICONDUCTORS |
| 描述： | Multistandard quasi parallel-sound processor for Mono-TV-Sets |
| 文件： | 总10页 (文件大小：154K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TDA4481-D
TELEFUNKEN Semiconductors
Multistandard quasi parallel-sound processor for
Mono-TV-Sets
Technology: Bipolar
Features
High signal sensitivity
Alignment free AM demodulator for standard L
High signal to noise ratio
Standardized SCART interface
Standard-, SCART- and Mute-switch TTL compatible
AF attenuator
Easy alignment of the multistandard filters
Converter for different intercarrier frequencies
AF output level matched to SIMAVELEC condition
Few external components
ESD protected
Case: 20-pin dual inline plastic
Figure 1 Block diagram
Rev. A1: 23.02.1995
1 (10)
TDA4481-D
TELEFUNKEN Semiconductors
Pin Configuration
Pin
1–2
3
Function
Pin
11
Function
Picture-IF-carrier input
SCART-switch
Ground
12–13
14
FM demod. circuit 5.5 MHz
FM deemphasis capacitor
Intercarrier output 5.5 MHz
Supply voltage
4
AGC storage capacitor
SCART-AF input
5
15
6
Standard switch
16
7
AF output (controlled)
Volume control voltage
SCART-AF output
VC0 tank circuit
17
Intercarrier input 5.5 MHz
and muting
8
9
18–19
20
Sound-IF-carrier input
not connected
10
Description
This circuit configuration permits high-quality processing amplifier with increased level and the AF standard switch
of audio carriers for all standards, providing separate inputs to the SCART switch. It is available at both AF outputs,
for the video and audio carriers. The audio carrier signal regulated (pin 7) and unregulated (pin 9).
(FM or AM) is passed to two multiplying mixer
Pin 14 is provided to connect a de-emphasis capacitor
arrangements via a 3-stage variable wide-band amplifier
(10 nF for 50 s). The de-emphasis is effective for both AF
with levelled output signals. One mixer demodulates AM
outputs during FM operation, but deactivated for AM
and generates the gain control signal. The second mixer
operation.
operates as an intercarrier demodulator and supplies the
A frequency converter is inserted to mix the different
possible sound frequency standards (4.5, 6.0, 6.5 MHz)
intermediate AF carrier.
The video carrier signal required to form the intercarrier is into a uniform intermediate audio frequency, e.g. 5.5 MHz.
decoupled in a prelimited and selected form from the The VCO frequency (pin 10) can be controlled from the
demodulator tank of the intermediate video frequency unlevelled AF output at pin 9 or the de-emphasis
circuit (TDA 4453 or TDA 4439) and led to the intercarrier connection at pin 14.
mixer via a limiting amplifier. By virtue of the system, the
The intercarrier and converter circuits as well as the FM
Nyquist range of the IF input filter in the video channel
demodulator are deactivated during AM modulation. FM
affects the attainable AF signal-to-noise ratio.
muting is also possible if a switching voltage is applied to
pin 17.
The audio FM IF carrier reaches a quadrature demodulator
via an interconnected IF-filter and subsequent limiting All switching functions (standard, SCART, mute) can take
amplifier. The resulting AF signal is led via a low-pass place with TTL-equivalent level.
2 (10)
Rev. A1: 23.02.1995
TDA4481-D
TELEFUNKEN Semiconductors
Absolute Maximum Ratings
Reference point Pin 11, unless otherwise specified
Parameters
Symbol
Value
10 ... 13.5
80
Unit
V
Supply voltage
Supply current
External voltages
Pin 16
Pin 16
V
S
I
mA
S
Pin 3,6
V
V
5
V
V
ext
Pin 1,2,4,5,7,8,9,12,
13,14,15,16,17,18,19,
V
ext
6
Power dissipation
P
tot
1
W
(in soldered position)
Junction temperature
T
125
°C
°C
°C
j
Ambient temperature range
Storage temperature range
T
amb
–25 to + 70
–25 to +125
T
stg
Thermal Resistance
Parameters
Symbol
Value
60
Unit
K/W
Junction ambient
R
thJA
Electrical Characteristics
V
S
= 12 V, T
= 25°C, reference point Pin 20 (11), unless otherwise specified
amb
Parameters
Test Conditions / Pins
Pin 16
Symbol
Min.
10
Typ.
Max.
13.5
Unit
V
Supply voltage range
Supply current
V
S
I
FM-operation
AM-operation
Pin 16
Pin 16
65
55
mA
V
S
V
o
V
Input DC voltage
Pin 5
4.4
3.7
Output DC voltage
Pin 7,9
o
Standard switching voltage, Pin 6
Standard B/G
Standard L
converter operation
V
V
I
1.9
0
3.5
2.3
2.7
1.5
V
V
S
Standard switching current
AGC range
≤ 5 V
20
A
6
65
dB
AM-operation
Min. sound carrier input
voltage
(AF-output voltage
Pin 7, 9 –3 dB) Pin 18–19
v
50
V
Audio output voltage
Harmonic distortion
m = 54 %
Pin 7, 9
Pin 7, 9
v
500
mV
f = 32.4 MHz,
THD
f
= 1 kHz
mod
m = 30 %
m = 80 %
0.3
1.0
1.0
2.5
%
Rev. A1: 23.02.1995
3 (10)
TDA4481-D
TELEFUNKEN Semiconductors
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
FM-operation
Min. sound carrier input
voltage
(intercarrier voltage –3 dB)
Pin 18, 19
v
v
50
20
V
Picture carrier input volt-
age
Pin 1–2
10
30
mV
Audio output voltage
Harmonic distortion
f
v
f
v
= 38.9 MHz, Pin 7, 9
v
500
mV
PC
= 20 mV,
1–2
=33.4 MHz,
SC
= 10 mV,
18–19
FM-deviation = 27 kHz,
f
= 1 kHz, Q = 22
mod
B
f
= 1 kHz,
Pin 7, 9
d
0.5
%
mod
Q = 22
B
FM-deviation = 30 kHz
Signal to noise ratio
Standard B/G
according to CCIR 468
specification
FM-deviation 30 kHz,
f
= 1 kHz
Pin 7, 9
(
mod
S+N)
N
1
Black burst
Grid test signal
62
50
dB )
AF amplifier – SCART-operation
Volume control range
Pin 7
Pin 8
Pin 8
Pin 3
80
dB
V
V for V
at Pin 7
at Pin 7
V
V
0
0.5
2
8
AFmin
AFmax
8
V for V
8
4.5
V
8
SCART control voltage
recording
playback
V
3
V
3
0
4
V
SCART input resistance
AF input voltage
Pin 5
Pin 5
R
55
k
S
THD ≤ 3 %
v
2
V
SCART-amplification
Attenuation
G
–1
60
0
+1
dB
dB
v = 500 mV,
5
Pin 7, 9
75
7,9
V = 0 V
3
Muting on (AF off)
Switching current
Muting off
Pin 17
Pin 17
V
0
4
1
V
A
V
17
I
600
17
voltage to diode Pin 17
Pin 10
V
17
V
S
Converter operation
DC at oscillator pin
Oscillator frequency range
Oscillator amplitude
V ≥ 3.5 V
6
V
10
2.7
V
2
f
9
13
MHz )
2
v
400
mV )
Operation quality factor of
external oscillator stage
Q
B
70
1)
Standard B/G IF-modulated-FBAS-signal
See application circuit
2)
4 (10)
Rev. A1: 23.02.1995
TDA4481-D
TELEFUNKEN Semiconductors
Rev. A1: 23.02.1995
5 (10)
TDA4481-D
TELEFUNKEN Semiconductors
6 (10)
Rev. A1: 23.02.1995
TDA4481-D
TELEFUNKEN Semiconductors
Rev. A1: 23.02.1995
7 (10)
TDA4481-D
TELEFUNKEN Semiconductors
8 (10)
Rev. A1: 23.02.1995
TDA4481-D
TELEFUNKEN Semiconductors
Figure 2 Test circuit
Rev. A1: 23.02.1995
9 (10)
TDA4481-D
TELEFUNKEN Semiconductors
Dimensions in mm
Package: DIP 20
10 (10)
Rev. A1: 23.02.1995
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