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Details, datasheet, quote on part number:TDA4474
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Datasheet text preview:
TDA4474
Multistandard Video-IF + 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 VIF plus 2 SIF) and the common pinning with TDA4471 gives flexibility to design a universal IF module for various applications.
Features
D 5 V 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 VIFin and 2 SIFin) D Package and relevant pinning is compatible with the TDA4471; simplifies the design of an universal IF module
Package: SDIP30
Ordering Information
Extended Type Number TDA4474-MSD Package SDIP30 Remarks
Rev. A3, 23-Feb-01
1 (16)
TDA4474
Offset comp. (optional) Loop filter
VCO
FPLL
0ฐ 90ฐ
VIF 2
AFC VIF amp
11
6
VIF 1 CAGC
7
8
Video det. AGC (VIF) Standard
17
CBL Tuner
13
12
Supply
Take over point SIF 2
FM det.
29
30
SIF amp
SIF input switch 3
1
SIF 1
5
AM det.
CAGC
94 7901
Figure 1. Block diagram
2 (16)
ฯ ฯ ฯ
2
AGC (SIF)
ฯ ฯ ฯ ฯ ฯฯ
Tuner AGC
ฯ ฯ ฯ ฯ ฯฯ
ฯฯ ฯฯ
ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ ฯฯ
10
ฯฯ ฯ ฯฯ ฯ
ฯ ฯ
ฯฯ ฯฯ
28
20
22
23
VCO + phase shift
ฯฯ ฯฯ
Block Diagram
L' switch and VIF input switch
16
Control 21 24
AFC switch AFC
14
Video
15
Standard switch VS
25
19
CRef
26
Intercarrier (FM / NICAM)
ฯฯ
27
AF (AM)
4,9,18
Rev. A3, 23-Feb-01
TDA4474
Pin Description
Vi,SIF1 1 Vi,SIF1 2 VSW GND CAGC Vi,VIF1 Vi,VIF1 CAGC GND 3 4 5 6 7 8 9 30 Vi,SIF2 29 Vi,SIF2 28 Rcomp 27 Vo,AM 26 Vo,FM 25 VS 24 VAFC 23 VVCO Pin 1, 2 3 4 5 6, 7 8 9 10, 11 12 13 14 15 16 17 18 19 20 21 22, 23 24 25 26 27 28 29, 30 Symbol Vi,SIF1 VSW GND CAGC Vi,VIF1 CAGC GND Vi,VIF2 Rtop Itun Vo,vid VSW VSW CBL GND CRef LF VSW VVCO VAFC VS Vo,FM Vo,AM Rcomp Vi,SIF2 Function SIF1 input (symmetrical) SIF input selector switch Ground SIF-AGC (time constant) VIF1 input (symmetrical) VIF-AGC (time constant) Ground VIF2 input (symmetrical) Take over point, tuner AGC Tuner AGC output current Video output Standard switch L'ญ/VIF input selector switch Capacitor ญ black level detector Ground Internal reference voltage Loop filter AFC switch VCO circuit AFC output Supply voltage Intercarrier output AF output ญ AM sound Offset compensation SIF2 input (symmetrical)
22 VVCO 21 20 19 18 17 16
94 8680
Vi,VIF2 10 Vi,VIF2 11 Rtop 12 Itun 13 Vo,vid 14 VSW(stand.) 15
Figure 2. Pinning
VSW LF CRef GND CBL VSW(L')
Rev. A3, 23-Feb-01
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3 (16)
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