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FMS3815KRC Dataheets PDF



Part Number FMS3815KRC
Manufacturers Fairchild Semiconductor
Logo Fairchild Semiconductor
Description Triple Video D/A Converters
Datasheet FMS3815KRC DatasheetFMS3815KRC Datasheet (PDF)

www.fairchildsemi.com FMS3810/3815 Triple Video D/A Converters 3 x 8 bit, 150 Ms/s Features • 8-bit resolution • 150 megapixels per second – 0.2% linearity error • Sync and blank controls • 1.0V p-p video into 37.5Ω or 75Ω load • Internal bandgap voltage reference • Double-buffered data for low distortion • TTL-compatible inputs • Low glitch energy • Single +5 Volt power supply Description FMS3810/3815 products are low-cost triple D/A converters that are tailored to fit graphics and video appli.

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www.fairchildsemi.com FMS3810/3815 Triple Video D/A Converters 3 x 8 bit, 150 Ms/s Features • 8-bit resolution • 150 megapixels per second – 0.2% linearity error • Sync and blank controls • 1.0V p-p video into 37.5Ω or 75Ω load • Internal bandgap voltage reference • Double-buffered data for low distortion • TTL-compatible inputs • Low glitch energy • Single +5 Volt power supply Description FMS3810/3815 products are low-cost triple D/A converters that are tailored to fit graphics and video applications where speed is critical. Two speed grades are available: FMS3810 FMS3815 100 Ms/s 150 Ms/s Applications • Video signal conversion – RGB – YCBCR – Composite, Y, C • Multimedia systems • Image processing • True-color graphics systems TTL-level inputs are converted to analog current outputs that can drive 25–37.5Ω loads corresponding to doubly-terminated 50–75Ω loads. A sync current following SYNC input timing is added to the IOG output. BLANK will override RGB inputs, setting IOG, IOB and IOR currents to zero when BLANK = L. Although appropriate for many applications the internal 1.235V reference voltage can be overridden by the VREF input. Few external components are required, just the current reference resistor, current output load resistors, and decoupling capacitors. Package is a 48-lead LQFP. Fabrication technology is CMOS. Performance is guaranteed from 0 to 70°C. Block Diagram SYNC BLANK SYNC G7-0 8 8 bit D/A Converter IOG B7-0 8 8 bit D/A Converter IOB R7-0 CLOCK 8 8 bit D/A Converter IOR COMP RREF VREF +1.235V Ref REV. 1.08 12/21/00 FMS3810/3815 PRODUCT SPECIFICATION Functional Description Within the FMS3810/3815 are three identical 10-bit D/A converters, each with a current source output. External loads are required to convert the current to voltage outputs. Data inputs RGB7-0 are overridden by the BLANK input. SYNC = H activates, sync current from IOS for sync-on-green video signals. D/A Outputs Each D/A output is a current source. To obtain a voltage output, a resistor must be connected to ground. Output voltage depends upon this external resistor, the reference voltage, and the value of the gain-setting resistor connected between RREF and GND. Normally, a source termination resistor of 75 Ohms is connected between the D/A current output pin and GND near the D/A converter. A 75 Ohm line may then be connected with another 75 Ohm termination resistor at the far end of the cable. This “double termination” presents the D/A converter with a net resistive load of 37.5 Ohms. The FMS3810/3815 may also be operated with a single 75 Ohm terminating resistor. To lower the output voltage swing to the desired range, the nominal value of the resistor on RREF should be doubled. Digital Inputs All digital inputs are TTL-compatible. Data is registered on the rising edge of the CLK signal. Following one stage of pipeline delay, the analog output changes tDO after the rising edge of CLK. SYNC and BLANK SYNC and BLANK inputs control the.


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