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ML6415 Dataheets PDF



Part Number ML6415
Manufacturers Fairchild
Logo Fairchild
Description S-Video Filter with Summed Composite Output / Sound Trap / and Group Delay Compensation
Datasheet ML6415 DatasheetML6415 Datasheet (PDF)

www.fairchildsemi.com ML6415 S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Features • • • • • • • • • • • 7.1MHz Y and C filters, with CV out 14dB notch at 4.5MHz for sound trap 42dB stopband attenuation at 27MHz on Y, C, and CV Better than 1dB flatness to 4.5 MHz on Y, C, and CV RF Modulator output differential group delay between 400kHz and 3.58MHz is typically -170ns. No external frequency select components or clocks 9ns group delay flatness on Y, C, and .

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www.fairchildsemi.com ML6415 S-Video Filter with Summed Composite Output, Sound Trap, and Group Delay Compensation Features • • • • • • • • • • • 7.1MHz Y and C filters, with CV out 14dB notch at 4.5MHz for sound trap 42dB stopband attenuation at 27MHz on Y, C, and CV Better than 1dB flatness to 4.5 MHz on Y, C, and CV RF Modulator output differential group delay between 400kHz and 3.58MHz is typically -170ns. No external frequency select components or clocks 9ns group delay flatness on Y, C, and CV output AC coupled inputs and outputs 0.4% differential gain on Y, C and CV channels, 0.4º differential phase on Y, C and CV channels 0.8% total harmonic distortion on all channels DC restore with low tilt General Description The ML6415 is a dual Y/C 4th-order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay. The device also contains a summing circuit to generate filtered composite video, an audio trap and group delay compensation circuit to notch-out audio, providing an area for the addition of the FM audio carrier(s) and mimic the group delay distortion introduced at the transmitter. The group delay predistortion compensates for the nominal TV receiver IF filter distortion. In a typical application, the Y and C input signals from DACs are AC coupled into the filter. Both channels have DC restore circuitry to clamp the DC input levels during video sync. The Y and C channels use a separate feedback clamp. The clamp pulse is derived from the Y channel. The outputs are AC coupled. The Y, C, CV, and modulator outputs can drive 2Vpp into a 150Ω load (1Vpp 75Ω coax load). The Y, C, CV, and notch channels have a gain of approximately 2 (6dB) with 1Vpp input levels. Applications • Cable Set-top Boxes • Satellite Set-top Boxes • DVD Players Block Diagram VCC 7 SYNC STRIP, REFERENCE, AND TIMING 4TH – ORDER FILTER YIN 1 ×2 8 YOUT gM 1V + Σ + gM 1V ×2 6 CVOUT NOTCH, GROUP DELAY ×2 2 RF MOD CIN 4 4TH – ORDER FILTER 5 COUT 3 GND REV. 2F May 2003 ML6415 DATA SHEET Pin Configuration ML6415 8-Pin SOIC (S08) YIN RF MOD GND CIN 1 2 3 4 8 7 6 5 YOUT VCC CVOUT COUT TOP VIEW Pin Descriptions Pin # 1 2 3 4 5 6 7 8 Signal Name YIN RF MOD GND CIN COUT CVOUT VCC YOUT Luminance input Output to RF modulator driver Ground Chrominance input Chrominance output Composite video output 5V supply Luminance output Description Functional Description Introduction This product is a dual monolithic continuous time video filter designed for reconstructing the luminance and chrominance signals from an S-Video D/A source. Composite video output is generated by summing the Y and C outputs. 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 Butterworth characteristic with an optimization toward low overshoot and flat group delay. Y, C, and CV outputs are capable of driving 2Vpp into AC coupled 150Ω 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 conventional 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 75Ω 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 150Ω load at 2Vpp, or 1Vpp into a 75Ω 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. 2 REV. 2F May 2003 DATA SHEET ML6415 Chrominance (C) I/O The chroma input is driven by a low impedance source of 0.7Vpp or the output of a 75Ω 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 150Ω load at 2VP-P, or 1VP-P into a 75Ω 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 cir.


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