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PDF TDA4474 Data sheet ( Hoja de datos )
| Número de pieza | TDA4474 | |
| Descripción | Multistandard Video-IF and Quasi Parallel Sound Processing | |
| Fabricantes | TEMIC Semiconductors | |
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TELEFUNKEN Semiconductors
TDA4474
Multistandard Video-IF and Quasi Parallel Sound Processing
Description
The TDA4474 is an integrated bipolar circuit for full
multistandard video/sound IF (VIF/SIF) signal
processing in TV/VCR and Multimedia applications. The
circuit processes all TV video IF signals with negative
modulation (e.g. B/G standard), positive modulation (e.g.
L standard) and the AM, FM/NICAM sound IF signals.
Four IF inputs (2 x VIF plus 2 x SIF) and the common
pinning with TDA4471 gives flexibility to design a
universal IF module for various applications.
Features
D 5V supply voltage; low power consumption
D Active carrier generation by FPLL principle
(frequency–phase–locked–loop) for true
synchronous demodulation
D Very linear video demodulation, good pulse
response and excellent intermodulation figures
D VCO circuit is operating on picture carrier
frequency, the VCO frequency is switchable for
the L’ mode
D Alignment–free AFC without external reference
circuit, polarity of the AFC curve is switchable
D VIF–AGC for negative modulated signals
(peak sync detection) and for positive modulation
(peak white/black level detector)
D Tuner AGC with adjustable take over point
D Alignment–free quasi parallel sound (QPS) mixer
for FM/NICAM sound IF signals
D Intercarrier output signal is gain controlled
(necessary for digital sound processing)
D Complete alignment–free AM demodulator with
gain controlled AF output
D Separate SIF–AGC with average detection
D Parallel operation of the AM demodulator and
QPS mixer (for NICAM–L stereo sound)
D Four IF inputs (2 x VIFin and 2 x SIFin)
D Package and relevant pinning is compatible with
the TDA4471; simplifies the design of an
universal IF module
Package:
30 pin shrink–dual–inline–plastic (SDIP30)
Rev. A1: 17.08.1995
Preliminary Information
1 (17)
1 page  
TELEFUNKEN Semiconductors
TDA4474
SIF amplifier output is multiplied in phase with the
limited SIF signal (AM is removed). The AF signal of the
demodulator output is fed to the output amplifier and to
the SIF–AGC. For all TV standards with negative video
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
polarity 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
selected 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 stereo sound.
L’ Switch and VIF Input Selection
For positive modulated signals (L/L’ standard) Pin 16
works as L’ switch. With a control voltage 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
connecting 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
performance independant of supply voltage and
temperature.
Absolute maximum values
Reference point pin 4 (9, 18), unless otherwise specified
ÁÁÁÁÁÁÁÁÁÁÁÁSSPOEJSEÁÁÁÁÁÁÁÁÁÁÁÁuuuotxluoneppwttcrecpppaÁtertÁÁÁÁÁÁÁÁÁÁÁurllignryyooteadsnccvlÁttiÁÁÁÁÁÁÁÁÁÁÁuuaesotverstmrloirmirtclepaepÁtÁÁÁÁÁÁÁÁÁÁÁngpanahetteegtrasiraeonÁaÁÁÁÁÁÁÁÁÁÁÁtsndutu,lriVrenÁeÁÁÁÁÁÁÁÁÁÁÁgs =*Á)ÁÁÁÁÁÁÁÁÁÁÁP+a9raÁÁÁÁÁÁÁÁÁÁÁÁVmeÁtÁÁÁÁÁÁÁÁÁÁÁersÁPPP1PPPaPÁÁÁÁÁÁÁÁÁÁÁl4iiiiiiilnnnnnnn,psssÁ1ÁÁÁÁÁÁÁÁÁÁÁ1212i1316n35457,,,s,1,2Á12ÁÁÁÁÁÁÁÁÁÁÁ25,9625,,,,2–2Á2ÁÁÁÁÁÁÁÁÁÁÁ218073,,, 212ÁÁÁÁÁÁÁÁÁÁÁÁ406––13ÁÁÁÁÁÁÁÁÁÁÁÁ20, ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁSVTyTVIVmÁÁÁÁÁÁÁÁÁÁÁÁEjoIsPeutsuSxsonbtDtrcoÁÁÁÁÁÁÁÁÁÁÁÁl ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ–25ÁÁÁ+ÁÁÁÁÁÁÁÁÁV+++7t39aV811o56430.l5320usÁ5ÁÁÁÁÁÁÁÁÁÁÁ..+0.555e512ÁÁÁÁÁÁÁÁÁÁÁÁ5 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁUmmmÁÁÁÁÁÁÁÁÁÁÁÁ°°VVVVVVnCCWAAitÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
*) Equivalent to discharging a 200 pF capacitor through a 0 resistor
Operating Range
ÁÁÁSAÁÁÁumpbpÁÁÁileynvtÁÁÁoteltmaÁÁÁgpeerrÁÁÁaatnugrÁÁÁee ÁÁÁParaÁÁÁmetÁÁÁersPÁÁÁin ÁÁÁ25 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁSyTVmÁÁÁamsbboÁÁÁl ÁÁÁÁÁÁÁÁÁ40.ÁÁÁV5toatol+uÁÁÁ98e.50ÁÁÁÁÁÁÁÁÁÁÁÁUÁÁÁ°VnCitÁÁÁÁÁÁ
Rev. A1: 17.08.1995
Preliminary Information
5 (17)
5 Page 
TELEFUNKEN Semiconductors
TDA4474
7. Without control voltage at Pin 16 (open circuit) the L’ switch is not active.
Standard switch, Pin 15
Mode 1: neg. modulation (B/G) Mode 2: pos. modulation (L)
2.0 V – Vs
0 – 0.8 V
L’/VIF input switch, Pin 16 3.4 V – 4.5 V 0 – 3.1 V
3.4 V – 4.5 V 0 – 3.1 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁExt. voltage at VIF input 2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPin 10 or 11
Modulation
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStandard
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁActive VIF input
(or Pin 16 open)
open 1 V open
neg.
B/G,...
VIF1
neg.
B/G,...
VIF1
neg.
B/G,...
VIF2
(or Pin 16 open)
1 V open 1 V open
*) neg. neg. neg.
*) L L L’
*) VIF2 VIF1 VIF2
1V
neg.
L’
VIF1
*) condition not useful
8. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz;
PC/SC1 =13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level)
9. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54 %; vin = 10 mV
10. Without control voltage at Pin 3 (open circuit) the SIF input 1 is automatically selected
SIF 2
30 29
AF Intercarrier
(AM) (FM/NICAM)
Loop
comp.
+VS
10 kW
28 27 26 25
AFC
24
AFC
switch
Loop
filter
6.8 pF
LVCO
150 W
CVCO
470 nF
23 22 21 20
Black
level
CRef
2.2 mF 470 nF
19 18 17
L’ and
VIF input
switch
16
TDA4474
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SIF 1
SIF
Input switch
10 mF
AGC (SIF)
2.2 mF
AGC (VIF)
VIF 1
VIF 2
10 kW
Tuner
delay
Tuner
AGC
Standard switch
(neg/pos)
Video
*) External L/C circuit (VCO: 38.9 MHz) with TOKO coil 7KN (9 turns, 0.12mm)
Figure 3. Test circuit
Rev. A1: 17.08.1995
Preliminary Information
11 (17)
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet TDA4474.PDF ] | |
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