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SPT1018BIN Datasheet(PDF) 4 Page - Cadeka Microcircuits LLC. |
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SPT1018BIN Datasheet(HTML) 4 Page - Cadeka Microcircuits LLC. |
4 / 11 page SPT1018 Figure 1 - Functional Diagram APPLICATION INFORMATION The SPT1018 is a high speed video digital-to-analog con- verter capable of conversion rates of up to 275 MWPS. This makes the device suitable for driving 1500 X 1800 pixel displays at 70 to 90 Hz update rates. The SPT1018 is separated into different conversion rate categories as shown in table I. The SPT1018 has 10 KH and 100K ECL logic level compat- ible video controls and data inputs. The complementary analog output currents produced by the devices are propor- tional to the product of the digital control and data inputs in conjunction with the analog reference current. The SPT1018 is segmented so that the four MSBs of the input data are separated into a parallel thermometer code. From here, fifteen identical current sinks are driven to fabricate sixteen coarse output levels. The remaining four LSBs drive four binary weighted current switches. The MSB currents are then summed with the LSBs, which provide a one-sixteenth of full scale contribution, to provide the 256 distinct analog output levels. The video control inputs drive weighted current sinks that are added to the output current to produce composite video output levels. These controls, Sync, Blank, Reference White (Force High), and Bright are needed in video applications. Another feature that similar video D/A converters do not have is the Feedthrough Control. This pin allows registered or unregistered operation of the video control and data inputs. In the registered mode, the composite functions are latched to the pixel data to prevent screen-edge distortions generally found on unregistered video DACs. 4 Decoding Logic Data Registers Current Sources And Switches Current Source Biasing Amp +- Out + Out - 8 Composite Video Controls Feedthrough D0 - D7 2 CONV CONV Ref+ VEE VCC Ref- Table I - The SPT1018 Family and Speed Designations PART NUMBER UPDATE COMMENTS SPT1018A 275 MWPS Suitable for 1200 X 1500 to 1500 X 1800 displays at 60 to 90 Hz update rate. SPT1018B 165 MWPS Suitable for 1024 X 1280 to 1200 X 1500 displays at 60 to 90 Hz update rate. 4 5/14/97 |
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