TELEFUNKEN Semiconductors

TDA4471

Preliminary Information

Rev. A1: 18.08.1995

10 (16)

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.

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

(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

7.

Without control voltage at Pin 16 (open circuit) the L’ switch is not active.

(Dimensions in mm) stan-

dard switch, Pin 15

Mode 1: neg. modulation (B/G)

2.0 V – VS

Mode 2: pos. modulation (L)

0 – 0.8 V

L’/VIF input switch, Pin 16

3.4 V – 4.5 V

(or Pin 16 open)

0 – 3.1 V

3.4 V – 4.5 V

(or Pin 16 open)

0 – 3.1 V

Ext. voltage at VIF input 2,

Pin 10 or 11

open

1 V

open

1 V

open

1 V

open

1 V

Modulation

neg.

neg.

neg.

*)

neg.

neg.

neg.

neg.

Standard

B/G,...

B/G,...

B/G,...

*)

L

L

L’

L’

Active VIF input

VIF1

VIF1

VIF2

*)

VIF2

VIF1

VIF2

VIF1

*) condition not useful

8.

9.