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ML6426CS-2 датащи(PDF) 6 Page - Micro Linear Corporation |
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ML6426CS-2 датащи(HTML) 6 Page - Micro Linear Corporation |
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6 / 17 page ![]() ML6426 6 November, 1999 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 characteristic with an optimization toward low overshoot and flat group delay. All outputs are capable of driving 2VP-P into AC coupled 150W video loads, with up to 35pF of load capacitance. All outputs are capable of driving a 75 W load at 1VP-P. All channels are clamped during sync to establish the appropriate 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. Figure 1. Typical Application Schematic 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. RIN 5V 5V R G 0.1µF 220µF 75Ω GIN 0.1µF 220µF 75Ω B 220µF 75Ω BIN SYNC IN 0.1µF 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 Figure 2. SYNC IN Pulse Width VIL = 1.0V 50% x VSYNC IN VIH = 2.5V PWMIN = 2µS |
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