TEMIC TDA4481-D Technical data

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TELEFUNKEN Semiconductors

TDA4481-D

Multistandard quasi parallel-sound processor for
Mono-TV-Sets

Technology: Bipolar

Features

High signal sensitivity
High signal to noise ratio
Easy alignment of the multistandard filters
Converter for different intercarrier frequencies
AF output level matched to SIMAVELEC condition
Few external components

Case: 20-pin dual inline plastic

Alignment free AM demodulator for standard L

Standardized SCART interface

Standard-, SCART- and Mute-switch TTL compatible

AF attenuator

ESD protected

Figure 1 Block diagram

Rev. A1: 23.02.1995 1 (10)

Pin Configuration

TELEFUNKEN SemiconductorsTDA4481-D

Pin Function

1–2 Picture-IF-carrier input

3 SCART-switch
4 AGC storage capacitor
5 SCART-AF input
6 Standard switch
7 AF output (controlled)
8 Volume control voltage
9 SCART-AF output

10 VC0 tank circuit

Description

This circuit configuration permits high-quality processing
of audio carriers for all standards, providing separate inputs
for the video and audio carriers. The audio carrier signal
(FM or AM) is passed to two multiplying mixer
arrangements via a 3-stage variable wide-band amplifier
with levelled output signals. One mixer demodulates AM
and generates the gain control signal. The second mixer
operates as an intercarrier demodulator and supplies the
intermediate AF carrier.

The video carrier signal required to form the intercarrier is
decoupled in a prelimited and selected form from the
demodulator tank of the intermediate video frequency
circuit (TDA 4453 or TDA 4439) and led to the intercarrier
mixer via a limiting amplifier. By virtue of the system, the
Nyquist range of the IF input filter in the video channel
affects the attainable AF signal-to-noise ratio.

The audio FM IF carrier reaches a quadrature demodulator
via an interconnected IF-filter and subsequent limiting
amplifier. The resulting AF signal is led via a low-pass

Pin Function

11 Ground

12–13 FM demod. circuit 5.5 MHz

14 FM deemphasis capacitor
15 Intercarrier output 5.5 MHz
16 Supply voltage
17 Intercarrier input 5.5 MHz

and muting

18–19 Sound-IF-carrier input

20 not connected

amplifier with increased level and the AF standard switch
to the SCART switch. It is available at both AF outputs,
regulated (pin 7) and unregulated (pin 9).

Pin 14 is provided to connect a de-emphasis capacitor
(10 nF for 50 s). The de-emphasis is effective for both AF
outputs during FM operation, but deactivated for AM
operation.

A frequency converter is inserted to mix the different
possible sound frequency standards (4.5, 6.0, 6.5 MHz)
into a uniform intermediate audio frequency, e.g. 5.5 MHz.
The VCO frequency (pin 10) can be controlled from the
unlevelled AF output at pin 9 or the de-emphasis
connection at pin 14.

The intercarrier and converter circuits as well as the FM
demodulator are deactivated during AM modulation. FM
muting is also possible if a switching voltage is applied to
pin 17.

All switching functions (standard, SCART, mute) can take
place with TTL-equivalent level.

Rev. A1: 23.02.19952 (10)

TELEFUNKEN Semiconductors

Absolute Maximum Ratings

Reference point Pin 11, unless otherwise specified

Parameters Symbol Value Unit
Supply voltagePin 16 V
Supply currentPin 16
External voltagesPin 3,6

Pin 1,2,4,5,7,8,9,12,
13,14,15,16,17,18,19,

Power dissipation
(in soldered position)

Junction temperature T
Ambient temperature range T
Storage temperature range T

Thermal Resistance

Parameters Symbol Value Unit
Junction ambient R

V
V

P

S

I

S

ext
ext

tot

j

amb

stg

thJA

TDA4481-D

10 ... 13.5 V

80 mA

V

5

6

1 W

125 C

–25 to + 70 C

–25 to +125 C

60 K/W

V
V

Electrical Characteristics

VS= 12 V, T

Supply voltage range Pin 16
Supply current

FM-operation

AM-operation
Input DC voltage Pin 5
Output DC voltage Pin 7,9
Standard switching voltage, Pin 6

Standard switching current
AGC range 65 dB

AM-operation

Min. sound carrier input
voltage

Audio output voltage m = 54 %Pin 7, 9 v 500 mV
Harmonic distortion f = 32.4 MHz, Pin 7, 9

= 25 C, reference point Pin 20 (11), unless otherwise specified

amb

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit

V

S

Pin 16

I

S

Pin 16

V

o

V

o

Standard B/G

V 1.9
Standard L
converter operation

V

5 V I 20 A

6

(AF-output voltage

v 50 V

10 13.5 V

65

mA

55

4.4

3.7

2.3 2.7

0

3.5

1.5

V

S

Pin 7, 9 –3 dB)Pin 18–19

THD

f

= 1 kHz

mod

m = 30 %
m = 80 %

0.3

1.0

1.0

2.5

V

V

%

Rev. A1: 23.02.1995 3 (10)

TELEFUNKEN SemiconductorsTDA4481-D

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit

FM-operation

Min. sound carrier input
voltage

Picture carrier input volt­age

Audio output voltage fPC= 38.9 MHz, Pin 7, 9

Harmonic distortion f

Signal to noise ratio
Standard B/G
according to CCIR 468
specification

AF amplifier – SCART-operation

Volume control range Pin 7 80 dB
V8for V
V8for V

at Pin 7 Pin 8 V

AFmin

at Pin 7 Pin 8 V

AFmax

SCART control voltage Pin 3

SCART input resistance Pin 5 R
AF input voltage THD 3 %Pin 5 v 2 V
SCART-amplification G – 1 0 +1 dB
Attenuation v5= 500 mV, Pin 7, 9

Muting on (AF off) Pin 17 V
Switching current Pin 17 I
Muting off voltage to diodePin 17 V
Converter operation Pin 10
DC at oscillator pin V63.5 V V
Oscillator frequency range f 9 13 MHz2)
Oscillator amplitude v 400 mV2)
Operation quality factor of

external oscillator stage

1)

Standard B/G IF-modulated-FBAS-signal

2)

See application circuit

(intercarrier voltage –3 dB)

Pin 18, 19 v 50 V
Pin 1–2 v 10 20 30 mV

v

= 20 mV,

1–2

fSC =33.4 MHz,
v

= 10 mV,

18–19

FM-deviation = 27 kHz,
f

= 1 kHz, QB = 22

mod

=1 kHz, Pin 7, 9

mod

QB = 22
FM-deviation = 30 kHz

FM-deviation 30 kHz,
f

= 1 kHzPin 7, 9

mod

Black burst
Grid test signal

recording
playback

V3 = 0 V

v 500 mV

d 0.5 %

(

S+N)

N

8
8

V

3

V

3

S

7,9

17

17

17

10

Q

B

0 0.5 V

4.5 V

0
4

60 75 dB

0 1 V

4 V

70

62
50

2 V

55 k

600 A

S

2.7 V

dB1)

V

Rev. A1: 23.02.19954 (10)

TELEFUNKEN Semiconductors

TDA4481-D

Rev. A1: 23.02.1995 5 (10)

TELEFUNKEN SemiconductorsTDA4481-D

Rev. A1: 23.02.19956 (10)

TELEFUNKEN Semiconductors

TDA4481-D

Rev. A1: 23.02.1995 7 (10)

TELEFUNKEN SemiconductorsTDA4481-D

Rev. A1: 23.02.19958 (10)

TELEFUNKEN Semiconductors

TDA4481-D

Figure 2 Test circuit

Rev. A1: 23.02.1995 9 (10)

Dimensions in mm

Package: DIP 20

TELEFUNKEN SemiconductorsTDA4481-D

Rev. A1: 23.02.199510 (10)