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Details, datasheet, quote on part number:TDA4452
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| Part: | TDA4452 |
| Category: | Multimedia => Video => Amplifiers |
| Description: | Video if Amplifier For Multistandard TV Receiver And VTR Appliances |
| Company: | Temic Semiconductors (acquired by ATMEL Corporation) |
| Datasheet: | Download TDA4452 datasheet File size : 186 kB |
| Request For quote: | Find where to buy TDA4452
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Datasheet text preview:
TDA4452
Video IF Amplifier for Multistandard TV Receiver and VTR Appliances
Technology: Bipolar Features
D Standard B/G-L suitable, processes negatively and
positively modulated IF-signals with equal polarity of the output signal
D Fast AGC by controlled discharge of the AGC
capacitor
D Ultra white inverter and ultrablack limiter for
reducing transmission interference
D Standard L mode: AGC acting on peak white level,
capacitor discharge control by averaged video signal Standard B/G: AGC acting on the sync. pulse peak
D Internally noise protected gain control, no flyback
pulses required
D Expanded video frequency response allows the
demodulation of amplitude modulated MAC signals
D High input sensitivity D Minimal intermodulation distortions D Small differential error
D D D D D D
Constant input impedance Video output voltage with narrow tolerance Video input/output for insertion of external sound trap VTR input/output with video switch Adjustable, delayed AGC for the tuner ESD protected
Case: DIP18
Figure 1. Block diagram
TELEFUNKEN Semiconductors Rev. A1, 15-Aug-96
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TDA4452
Pin Description
Pin 1,18 2 3 4 5 6 7 Function IF input Video switch control VTR input, 1 VPP VTR output, 2 VPP (inverted) Supply voltage VS Video output, 2 VPP Video input, after sound trap, 2 VPP Pin 8,17 9 10,11 12 13 14 15 16 Function Ground Video output, 3 VPP from demodulator Demodulator circuit standard switch B/G-L Average capacitor standard L Tuner AGC take over AGC (tuner control) IF AGC storage capacitor
Circuit Description
The following functional units are integrated in this circuit combination for processing multi standard television IF signals: The IF signal is supplied to the synchronous demodulator via a three-stage gain controlled wideband amplifier. A level detector limits the output voltage of the wideband amplifier in the event of overdrive. The required switching carrier for the demodulator is obtained from the IF signal of the wideband amplifier by means of a selection and limiter stage. A delay network is connected upstream of the demodulator in order to compensate phase differences. The polarity of the switching carrier at the output of the limiter stage can be reversed with the standard switch (Pin 12), with the result that negatively or positively modulated IF signals appear at the demodulator output with the same polarity. The demodulated video signal is filtered and amplified and is supplied to the video output (Pin 9) via a noise limiter stage. The standard switch also adapts the operating point of the video post-amplifier and the IF AGC to the standard which is to be processed. In the case of standard B/G, the synchronous peak value acts as the control criterion for rapid charging and discharge. In contrast, rapid control is achieved for standard L by charging for ultra white and discharge by the average (Pin 13) with controlled reference. An adjustable control current output (Pin 15) is available for delayed control of the tuner pre-stage. A video source switch with 2 inputs is integrated for VTR applications. The external VTR signal is supplied capacitively to the input Pin 3 and is clamped to the synchronous peak value. The second video input Pin 7 is connected with Pin 9 (video signal from demodulator) via an external sound trap. The sound trap must process an attenuation for dc and ac of 3.5 dB so that the video switch is not overdrived. In addition, the demodulated video signal is available in inverted form as a VTR output signal at Pin 4, independent of the position of the video switch.
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TDA4452
Absolute Maximum Ratings
Reference point Pin 8, unless otherwise specified Parameters Supply voltage range External voltage Pin 5 Pin 2, 4, 12, 15 Pin 9, 16 Pin 6 Pin 4, 6, 9 Pin 4, 6, 9 Symbol VS V2,4,12,15 V9,16 V6 I0 I0 Tj Tamb Tstg Value 10 to 13.5 VS 8 6 5 30 125 25 to +70 25 to +125 Unit V V mA mA °C °C °C
Video output current,max load Short circuit max 1 s Junction temperature Ambient temperature range Storage temperature range
Thermal Resistance
Parameters Junction ambient, in soldered position Symbol RthJA Value 60 Unit K/W
Electrical Characteristics
VS = +12 V, Tamb = 25°C, reference point Pin 8, unless otherwise specified Parameters Test Conditions / Pins Supply voltage Pin 5 Supply current Pin 5 IF amplifier and AGC, Pins 1, 18 Min. input voltage Max. input voltage IF AGC gain reduction Input impedance Response time of the peak white control in standard L 1) Available tuner AGC Automatic tuner AGC with IF control Demodulator and output stage 2), Pin 9 Ultra white level at standard B/G Ultra black clamping level at standard B/G Composite video output signal B/G 3) Pin 16 Symbol VS IS Vi Vi vp Ri Ci tr Min. 10 38 Typ. 44 70 120 65 1.2 2 Max. 13.5 52 100 Unit V mA
mV
mV dB kW pF ms mA dB
100 60
10
Pin 15
I1 5 AGC
5 61
Vo Vo vo(pp)
7.1 4.0 2.7
7.5 4.2 3.0
7.9 4.4 3.3
V V V
Notes: 1) A peak white value for at least 10 ms must be transmitted for each complete frame 2) All measurements Pin 9 without load 3) Residual carrier 10%
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