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TDA4881 Dataheets PDF



Part Number TDA4881
Manufacturers NXP
Logo NXP
Description Advanced monitor video controller
Datasheet TDA4881 DatasheetTDA4881 Datasheet (PDF)

INTEGRATED CIRCUITS DATA SHEET TDA4881 Advanced monitor video controller Preliminary specification File under Integrated Circuits, IC02 November 1992 Philips Semiconductors Preliminary specification Advanced monitor video controller FEATURES • Fully DC controllable • 3 separate video channels • Input black level clamping • White level adjustment for 2 channels only • Brightness control with correct grey scale tracking • Contrast control for all 3 channels simultaneously • Cathode feedback to .

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INTEGRATED CIRCUITS DATA SHEET TDA4881 Advanced monitor video controller Preliminary specification File under Integrated Circuits, IC02 November 1992 Philips Semiconductors Preliminary specification Advanced monitor video controller FEATURES • Fully DC controllable • 3 separate video channels • Input black level clamping • White level adjustment for 2 channels only • Brightness control with correct grey scale tracking • Contrast control for all 3 channels simultaneously • Cathode feedback to internal reference for cut-off control, which allows unstabilized video supply voltage • Current outputs for RGB signal currents • RGB voltage outputs to external peaking circuits • Blanking and switch-off input for screen protection • Sync on green operation possible QUICK REFERENCE DATA SYMBOL VP IP Vl(b-w) VO(b-w) IO(b-w) IM B Gnom Gv Cv ∆Vbl Tamb supply current input voltage (black-to-white, pins 2, 5 and 8) output voltage (black-to-white, pins 19, 16 and 13) output current (black-to-white, pins 20, 17 and 14) peak output current (pins 20, 17 and 14) bandwidth nominal gain gain control range for 2 channels (relative to Gnom) contrast control range (relative to Gnom) brightness control range operating ambient temperature range nominal gain −3 dB nominal contrast and nominal gain PARAMETER positive supply voltage (pin 7) CONDITIONS MIN. TYP. 7.2 − − − − − 70 − −4 −20 −80 0 8.0 46 0.7 0.8 50 − − 1 − − − − GENERAL DESCRIPTION TDA4881 The TDA4881 is a monolithic integrated RGB amplifier for colour monitor systems with super VGA performance, intended for DC or AC coupling of the colour signals to the cathodes of the CRT. With special advantages the circuit can be used in conjunction with the TDA4851. MAX. 8.8 56 1.0 − − 100 − − +2 +3 +240 +70 UNIT V mA V V mA mA MHz dB dB dB mV °C ORDERING INFORMATION EXTENDED TYPE NUMBER TDA4881 Note 1. SOT146-1; 1996 November 27. PACKAGE PINS 20 PIN POSITION DIL MATERIAL plastic CODE SOT146(1) November 1992 2 Philips Semiconductors Preliminary specification Advanced monitor video controller TDA4881 Fig.1 Block diagram and basic application circuit for DC and AC coupling. November 1992 3 Philips Semiconductors Preliminary specification Advanced monitor video controller PINNING SYMBOL BRC VI1 GC1 GND VI2 CC VP VI3 HBL CL GC3 FB3 VO3 IO3 FB2 VO2 IO2 FB1 Fig.2 Pin configuration VO1 IO1 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DESCRIPTION brightness control signal input Channel 1 gain control Channel 1 ground signal input Channel 2 contrast control supply voltage signal input Channel 3 horizontal blanking, switch off input clamping, vertical blanking gain control Channel 3 feedback Channel 3 voltage output Channel 3 current output Channel 3 feedback Channel 2 voltage output Channel 2 current output Channel 2 feedback Channel 1 voltage output Channel 1 current output Channel 1 TDA4881 November 1992 4 Philips Semiconductors Preliminary specification Advanced monitor video controller FUNCTIONAL DESCRIPTION RGB input signals (0.7 V(p-p)) are capacitively coupled into the TDA4881 (pins 2, 5 and 8) from a low ohmic source and are clamped to an internal DC voltage (artificial black level). Composite signals will not disturb normal operations because an internal clipping circuit cuts all signal parts below black level. Channels 1 and 3 have a maximum total voltage gain of 6 dB (maximum contrast and maximum individual channel gain), Channel 2 of 4 dB (maximum contrast and nominal channel gain). With the nominal channel gain of 1 dB and nominal contrast setting the nominal black-to-white output amplitude is 0.8 V(p-p). DC voltages are used for brightness, contrast and gain control. TDA4881 black level. The coupling capacitors are used in this way for black level storage. Because the threshold for the clamping pulse is higher than that for vertical blanking (pin 10) the rise and fall times of the clamping pulse have to be faster than 75 ns/V (1 V to 3.5 V). The vertical blanking pulse will be detected if the input voltage (pin 10) is higher than the threshold voltage for approximately 300 ns but does not exceed the threshold for the clamping pulse in the time between. During the vertical blanking pulse the input clamping is disabled to avoid misclamping in the event of composite input signals. The input signal is blanked and the artificial black level is inserted instead. Additionally the brightness is internally set to its nominal value, thus the output signal is at reference black level. The DC value of the reference black level will be adjusted by cut-off stabilization. During horizontal blanking (pin 9) the output signal is set to reference black level as previously described and output clamping is activated. If the voltage at pin 9 exceeds the switch off threshold the signal is blanked and switched to ultra black level for screen protection and spot suppression during V-flyback. Ultra black level is the lowest possible output voltage (at voltage outputs) and d.


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