USC1850

The USC1850 has the following features including 8 Bit Resolution;85 MSPS Min. Update Rate;Single + 5 V Supply;TTL / CMOS Compatible;Low Glitch Energy;Adjustable Current Source;Normal or Complement Data;Independent Adjustable Output Levels:Composite Sync,Composite Blank,10% Bright;Low Power CMOS (100 mW typical);Control Pins for Setting:Reference White,Reference Black.

The model USC1850 is a monolithic high speed, 8 bit DAC designed for video applications.  The output of this silicon gate CMOS integrated circuit is a current source whose full scale value is set by an external resistor.  The USC1850 has composite sync,  composite  blank,  and  10  percent  bright signals. USC1850 is able to drive 75 ohm or 37.5 ohm loads while operating at a minimum conversion rate of 85 MSPS.  The input code is straight binary with the capability of accepting inverted incoming data. The USC1850 requires only a single  +5 volt power supply and it will accept either TTL or CMOS inputs.The components marked with an asterisk are used to adjust the values of composite sync,composite blank, and 10% bright currents.  Normally, these components aren't used since the composite video signals have been preset to their nominal values. The output load is a 75 ohm resistor. If this connects to a 75 ohm terminated cable, then the actual output load is 37.5 ohms, and, to achieve a 1.0V output, the resistors connected to the+1.2V reference pin should be half the values shown.

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