tda4474-msd ATMEL Corporation, tda4474-msd Datasheet - Page 9

• Manufacturer Part Number: tda4474-msd
• Description: Multistandard Video-if And Quasi Parallel Sound Processing
• Manufacturer: ATMEL Corporation

Rev. A2, 04-Dec-98
Notes:
1.)
2.)
3.)
4.)
5.)
6.)
7.)
8.)
9.)
10.)
11.)
Control voltage:
Switching current
This parameter is given as an application information and not tested during production.
Adjustment of turn over point (delayed tuner AGC) with external resistor R
Resonance circuit of the VCO, f = 38.9 MHz:
Capacitor C
for an oscillator voltage
The oscillator drift is related to picture carrier frequency, at external temperature-compensated
LC circuit
Without external control voltage at Pin 15 (open circuit) the IC automatically operates in mode 1:
negative modulated video IF and FM/NICAM sound signals
Without control voltage at Pin 21 (open circuit) the falling AFC curve is automatically selected
Without control voltage at Pin 16 (open circuit) the L’ switch is not active.
*) condition not useful
Picture carrier PC = 38.9 MHz; sound carrier SC
PC/SC
Sound carrier SC = 32.4 MHz, modulated with f
Without control voltage at Pin 3 (open circuit) the SIF input 1 is automatically selected
SIF input 1 active
SIF input 2 active
Standard Switch, Pin 15
L’/VIF Input Switch, Pin 16
Ext. Voltage at VIF Input 2
Parameters
(Standard Switch)
1
Selected Standard
a
a
input signal conditions:
Active VIF Input
Voltage at Pin 15
Voltage at Pin 21
=13 dB; PC/SC
(1.07) = 20 log (4.43 MHz component/1.07 MHz component);
(1.07) value related to black-white signal
AFC Function
(AFC Switch)
Pin 10 or 11
Modulation
Standard
VCO
(Mode)
[
8.2 – 10 pF, coil L
2
w
See note 11
= 20 dB; PC unmodulated (equivalent to sync peak level)
100 mV
Test Conditions / Pins
Mode 1: neg. modulation (B/G)
2.0 V – V
3.4 V – 4.5 V
(or Pin 16 open)
B/G,...
VIF1
open
neg.
AFC switched OFF
picture carrier
colour carrier
sound carrier
RMS
VCO
0 – 0.8 V
(Pin 22–23); e.g., TOKO coil 7KM, 292 XNS – 4051Z
VIF: pos. modulation
SIF: AM + NICAM
S
B/G,...
VIF1
neg.
with unloaded Q-factor Q
1 V
(L standard)
0 – 0.8 V
Mode 2
mod
1
= 33.4 MHz, SC
0 – 3.1 V
= 1 kHz, m = 54 %; v
B/G,...
VIF2
open
neg.
Symbol
–24 dB
V
–6 dB
I
SW
0 dB
SW
AFC curve rising
1 V
*)
*)
*)
1.5 – 2.5 V
2
= 33.1578 MHz;
Min.
2.0
0
0
Mode 2: pos. modulation (L)
0 – 0.8 V
3.4 V – 4.5 V
(or Pin 16 open)
w
VIF2
open
pos.
in
L
60
top
= 10 mV
or external voltage V
"
VIF: neg. modulation
Typ.
SIF: FM/ NICAM
100
(or Pin 15 open)
VIF1
(B/G standard)
pos.
1 V
TDA4474
L
2 V – Vs
Mode 1
AFC curve falling
(or Pin 21 open)
Max.
0 – 3.1 V
0.8
3.5 V – Vs
V
VIF2
open
pos.
s
L’
top
.
Unit
VIF1
m
pos.
V
V
9 (16)
1 V
L’
A