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Voltage References

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Video Circuits (continued)<br />

Triple a-Bit AID Converter<br />

MC44250/51 FN Case 777<br />

The MC44250 and MC44251 contain three independent<br />

parallel analog to digital converters. Each ADC consists of 256<br />

latching comparators and an encoder. Input clamps allow for<br />

AC coupling of the input signals, and DC coupling is also<br />

allowed. For video processing performance enhancements, a<br />

dither generator with subsequent digital correction is provided<br />

to each ADC. The outputs of the MC44251 can be set to a high<br />

impedance state.<br />

Rtop<br />

Rmid<br />

Vrel<br />

Analog Input<br />

HZ<br />

VTN<br />

Mode<br />

Simplified Diagram of One of the ADCs<br />

MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA<br />

9-15<br />

These AIDs are especially suitable as front end converters<br />

in TV picture processing.<br />

• 15 MHz Maximum Conversion Speed (MC44250)<br />

• 18 MHz Maximum Conversion Speed (MC44251)<br />

• Input Clamps suitable for RGB and YUV applications<br />

• Built-in Dither Generator with Subsequent<br />

Digital Correction<br />

• Single 5.0 V Power Supply<br />

Clock<br />

8<br />

Data<br />

Outputs

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