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ML6415 Datasheet(PDF) 5 Page - Micro Linear Corporation |
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ML6415 Datasheet(HTML) 5 Page - Micro Linear Corporation |
5 / 9 page June, 2000 Datasheet 5 ML6415 INTRODUCTION This product is a dual monolithic continuous time video filter designed for reconstructing the luminance and chro- minance signals from an S-Video D/A source. Composite video output is generated by summing the Y and C out- puts. The chip is intended for use in applications with AC coupled input and AC coupled outputs. (See Figure 1) The reconstruction filters approximate a 4th-order But- terworth characteristic with an optimization toward low overshoot and flat group delay. Y, C, and CV outputs are capable of driving 2VP-P into AC coupled 150 Ω video loads, with up to 35pF of load capacitance at the output pin. All channels are clamped during sync to establish the appropriate output voltage swing range. Thus the input coupling capacitors do not behave according to the con- ventional RC time constant. Clamping for all channels settles to less than 10mv within 5ms of a change in video input sources. In most applications the input coupling capacitors are 0.1µF. The Y and C input typically sinks 1µA during active video, which nominally tilts a horizontal line by about 2mV at the Y output. During sync, the clamp typically sources 20µA to restore the DC level. The net result is that the average input current is zero. Any change in the input coupling capacitor’s value will inversely alter the amount of tilt per line. Such a change will also linearly affect the clamp response times. This product is robust and stable under all stated load and input conditions. Capacitive bypassing VCC directly to ground ensures this performance. LUMINANCE (Y) I/O The luma input is driven by either a low impedance source of 1Vp-p or the output of a 75 Ω terminated line. The input is required to be AC coupled via a 0.1µF coupling capacitor which allows for a settling time of 5ms. The luma output is capable of driving an AC coupled 150 Ω load at 2VP-P, or 1VP-P into a 75 Ω load. Up to 35pF of load capacitance (at the output pin) can be driven without stability or slew issues. The output is AC coupled with a 400µF or larger AC coupling capacitor. FUNCTIONAL DESCRIPTION CHROMINANCE (C) I/O The chroma input is driven by a low impedance source of 0.7Vp-p or the output of a 75 Ω terminated line. The input is required to be AC coupled via a 0.1µF coupling capacitor which allows for a clamp setting time of 5ms. The chroma output is capable of driving an AC coupled 150 Ω load at 2VP-P, or 1VP-P into a 75 Ω load. Up to 35pF of load capacitance can be driven without stability or slew issues. A 0.1µF AC coupling capacitor is recommended at the output. (This reduces the circuit cost as chroma does not contain low frequency components.) COMPOSITE VIDEO (CV) OUTPUT The composite video output is capable of driving 2 loads to 2VP-P. It is intended to drive a TV and a VCR. Either the TV input or the VCR input can be shorted to ground and the other output will still meet specifications. Up to 35pF of load capacitance (at the output pin) can be driven without stability or slew issues. RF MODULATOR OUTPUT The RF modulator output is capable of driving a 600 Ω load to 2VP-P, but is primarily intended to drive a modulator load. |
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