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ML6426CS4X_NL Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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ML6426CS4X_NL Datasheet(HTML) 6 Page - Fairchild Semiconductor |
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6 / 17 page  ML6426 DATA SHEET 6 REV. 3A August 2004 Functional Description The ML6426 is a triple monolithic continuous time video filter designed for reconstructing video signals from an YUV/RGB video D/A source. The ML6426 is intended for use in AC coupled input and output applications. The filters approximate a 4th-order Butterworth characteris- tic with an optimization toward low overshoot and flat group delay. All outputs are capable of driving 2VP-P into AC coupled 150 Ω video loads, with up to 35pF of load capaci- tance. All outputs are capable of driving a 75 Ω load at 1VP-P. All channels are clamped during sync to establish the appro- priate output voltage swing range (DC restore). Thus the input coupling capacitors do not behave according to the conventional RC time constant. In most applications, the ML6426's input coupling capacitors are only 0.1µF. An external CMOS compatible HSYNC pulse is required which is Active High on the SYNC IN Pin. See Figure 2. During sync, the feedback clamp sources/sinks current to restore the DC level. The net result is that the average input current is zero. Any change in the input coupling capacitors' value will linearly affect the clamp response times. Each channel is essentially tilt-free. Each input is clamped by a feedback amp which responds to the output during sync. The ML6426 is robust and stable under all stated load and input conditions. Bypassing both VCC pins directly to ground ensures this performance. Figure 1. Typical Application Schematic Figure 2. SYNC IN Pulse Width RIN 5V 5V R G 0.1 µF 220 µF 75Ω GIN 0.1 µF 220 µF 75Ω B 220 µF 75Ω BIN SYNC IN 0.1 µF RINA/YINA 2 RINB/YINB BINA/VINA 8 BINB/VINB 9 A/B MUX GINA/UINA 6 GINB/UINB 7 ROUT/YOUT 13 GOUT/UOUT 11 BOUT/VOUT 10 4th-ORDER FILTER A 4th-ORDER FILTER B 4th-ORDER FILTER C MUX MUX MUX ×2 ×2 ×2 TRANSCONDUCTANCE ERROR AMP TRANSCONDUCTANCE ERROR AMP TRANSCONDUCTANCE ERROR AMP 1 SYNCIN 16 GNDO 14 DISABLE 15 VCCO 12 VCC 4 GND 3 5 + – + – + – 0.5V 0.5V 0.5V ACTIVE HIGH VIL = 1.0V 50% x VSYNC IN VIH = 2.5V PWMIN = 2µS |
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