TELEFUNKEN Semiconductors

TDA4474

Preliminary Information

Rev. A1: 17.08.1995

10 (17)

Electrical Characteristics

Parameters

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

AF output – AM:

Pin 27 see n te 9

DC output voltage

2 2

V

Output resistance

ee note 1

150

AF output voltage, RMS

value

m = 54 %

500

mV

Total harmonic distortion

m = 54 %

THD

1

2

%

Signal to noise ratio

Reference: m = 54%,

22 kHz low pass filter

S/N

65

dB

Ripple rejection

Pins 25, 27

see note 1

RR

28

dB

SIF input selector switch

Pin 3

Control voltage:

SIF input 1 active

see note 10

2.0

V

SIF input 2 active

0

0.8

V

Switching current

100

A

Notes:

1.

This parameter is given as an application information and not tested during production.

2.

3.

The oscillator drift is related to picture carrier frequency, at external temperature–compensated LC

circuit

4.

a(1.07) = 20 log (4.43 MHz component/1.07 MHz component);

a(1.07) value related to black–white signal

input signal conditions:

picture carrier

0 dB

colour carrier

–6 dB

sound carrier

–24 dB

5.

Without external control voltage at pin 15 (open circuit) the IC automatically operates in mode :

negative modulated video IF and FM/NICAM sound signals

Voltage at Pin 15

(standard switch)

0 – 0.8 V

2.0V – Vs

(or Pin 15 open)

Selected standard

(mode)

mode 2 (L standard)

VIF: pos. modulation

SIF: AM + NICAM

mode 1 (B/G standard)

VIF: neg. modulation

SIF: FM/ NICAM

6.

Without control voltage at Pin 21 (open circuit) the falling AFC curve is automatically selected

Voltage at Pin 21

(AFC switch)

0 – 0.8 V

1.5 – 2.5 V

3.5 V – Vs

(or pin 21 open)

AFC function

AFC switched OFF

AFC curve rising

AFC curve falling