TDA4471 Datasheet, PDF (5/16 Pages) TEMIC Semiconductors – Multistandard Video-IF and Quasi Parallel Sound Processing

TELEFUNKEN Semiconductors
TDA4471
modulation (e.g. B/G standard) the AF output signal
(Pin 27) is switched off by the standard switch.
Quasi–Parallel–Sound (QPS) mixer
The QPS mixer is realized by a multiplier. The SIF signal
(FM or NICAM carrier) is converted to the intercarrier
frequency by the regenerated picture carrier (quadrature
signal) which is provided from the VCO. The intercarrier
signal is fed via an output amplifier to Pin 26.
Standard switch
To have equal polarity of the video output signal the po-
larity can be switched in the demodulation stage in
accordance with the TV standard. Additional a standard
dependent DC level shift in the video amplifier delievers
the same sync level. Parallel the correct VIF–AGC is se-
lected for positive or negative modulated VIF signals. In
case of negative modulation (e.g. B/G standard) the AM
output signal is switched off. If the standard for positive
modulation (L standard) is selected the AM demodulator
and QPS mixer is active. This condition allows a parallel
operation of the AM sound signal and the NICAM–L ste-
reo sound.
L’ switch and VIF input selection
For positive modulated IF signals (L/L’ standard) Pin 16
works as L’ switch. With a control voltage at Pin 16 the
VCO frequency can be switched for setting to the required
L’ value (L’ standard). Also a fine adjustment of the L’–
VCO centre frequency is possible by a potentiometer. The
L’ switch is only active for positive modulated video IF
signals (standard switch in L mode). In this mode the
video IF input 2 (VIF2) is forced by the standard switch.
The possibility to select VIF1 input is given by connect-
ing VIF2 input (pin 10 or 11) via 10 k resistor to ground.
If negative modulation (B/G mode) is selected pin 16 op-
erates as an input selection switch for the two VIF inputs.
AFC switch
The AFC output signal at Pin 24 can be controlled by a
switching voltage at Pin 21. It is possible to select an AFC
output signal with rising– or falling AFC curve and to
switch off the AFC.
Internal voltage stabilizer
The internal bandgap reference ensures constant perfor-
mance independant of supply voltage and temperature.
Absolute maximum values
Reference point pin 4 (9, 18), unless otherwise specified
Parameters
Symbol
Value
Unit
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Supply voltage}
Pin 25
V_S
9.0
V
Supply current
Pin 25
I_S
85
mA
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Power dissipation, Vs = + 9 V}
P
765
mW
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Output currents}
Pin 14, 26, 27
I_out
5
mA
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{External voltages}
Pins 1, 2, 5–8, 10–12,
V_ext
+ 4.5
V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 14, 16, 19, 20, 26–28
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{Pins 17, 22, 23}
+ 3.5
V
Pins 13
+ 13.5
V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Pins 15, 21, 24}
V_s
V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Junction temperature}
T_j
+125
°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Storage temperature}
T_stg
–25 to +125
°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Electrostatic handling *)}
All pins
V_ESD
300
V
*) Equivalent to discharging a 200 pF capacitor through a 0 resistor
Operating Range
ÁÁÁ_SAÁÁÁ_umpbpÁÁÁ_ileynvtÁÁÁ_oteltmaÁÁÁ_gpeerrÁÁÁ_aatnugrÁÁÁ_ee25ÁÁÁ^ParaÁÁÁ^metÁÁÁ^ersÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^SyTVmÁÁÁ_amS^b_b^oÁÁÁ^l ÁÁÁÁÁÁÁÁÁ_40.ÁÁÁ^V5toatol+uÁÁÁ_98e.50ÁÁÁÁÁÁÁÁÁÁÁÁ^UÁÁÁ_°VnCitÁÁÁÁÁÁ
Rev. A1: 18.08.1995
Preliminary Information
5 (16)