TDA4474 Datasheet, PDF (10/17 Pages) TEMIC Semiconductors – Multistandard Video-IF and Quasi Parallel Sound Processing

TDA4474
TELEFUNKEN Semiconductors
Electrical Characteristics
V_s = +5V, T_amb = +25°C; reference point 4 (9 ,16), unless otherwise specified
Parameters
AF output – AM:
ÁÁ Á _{DC output voltage}
ÁÁÁÁÁÁÁÁ _{Output resistance}
Test Conditions / Pins Symbol
Pin 27 see n te 9
ÁÁÁÁÁ_VDC
ÁÁ ^{ÁÁ ee note 1}
R_out
Min.
Typ.
Á^{2 2}
150
Max.
Unit
V
AF output voltage, RMS m = 54 %
v_oAF
500
mV
value
ÁÁÁÁÁÁ ^{Total harmonic distortion}
m = 54 %
mod ^{= 1kHz, 12 5kHz}
THD
Signal to noise ratio
Reference: m = 54%,
S/N
1
2
%
65
dB
f_mod = 1 kHz,
22 kHz low pass filter
ÁÁÁÁÁÁÁ ^{ÁÁ Ripple rejection}
SIF input selector switch
see note 1
Pins 25, 27
Á^{Pin 3}
RR
28
Control voltage:
ÁÁ Á ^{SIF input 1 active}
SIF input 2 active
see note 10
V_SW
2.0
0
dB
V_s
V
0.8
V
Switching current
I_SW
100
A
Notes:
1. This parameter is given as an application information and not tested during production.
2. Adjustment of turn over point (delayed tuner AGC) with external resistor R_top or external voltage V_top.
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 :
Á Á ÁÁ ^{negative modulated video IF and FM/NICAM sound signals}
Voltage at Pin 15
(standard switch)
Selected standard
0 – 0.8 V
mode 2 (L standard)
ÁÁÁ ^{2.0V – Vs}
(or Pin 15 open)
mode 1 (B/G standard)
(mode)
VIF: pos. modulation
VIF: neg. modulation
SIF: AM + NICAM
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)
AFC function
0 – 0.8 V
AFC switched OFF
1.5 – 2.5 V
AFC curve rising
3.5 V – Vs
(or pin 21 open)
AFC curve falling
10 (17)
Preliminary Information
Rev. A1: 17.08.1995