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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADV7150LS170 датащи(PDF) 24 Page - Analog Devices |
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ADV7150LS170 датащи(HTML) 24 Page - Analog Devices |
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24 / 36 page  ADV7150 –24– REV. A DIGITAL-TO-ANALOG CONVERTERS (DACS) AND VIDEO OUTPUTS The ADV7150 contains three high speed video DACs. The DAC outputs are represented as the three primary analog color signals IOR (red video), IOG (green video) and IOB (blue video). Other analog signals on the part include IPLL and VREF as well as complementary video outputs IOR, IOG, IOB. These comple- mentary outputs can be used to drive differentially terminated video loads, they will have equal but opposite output levels to IOR, IOG and IOB when loaded with a resistive load similar to IOR, IOG and IOB. DACs and Analog Outputs The part contains three matched 10-bit digital-to-analog con- verters. The DACs are designed using an advanced, high speed, segmented architecture. The bit currents corresponding to each digital input are routed to either IOR, IOG, IOB (bit = “l”) or IOR , IOG, IOB (bit = “0”). (Normally IOR, IOG, IOB = GND.) The analog video outputs are high impedance current sources. Each of the these three RGB current outputs are specified to directly drive a 37.5 Ω load (doubly terminated 75 Ω). DACs IOR, IOG, IOB ZO = 75Ω ZS = 75Ω (SOURCE TERMINATION) ZL = 75Ω (MONITOR) (CABLE) Figure 29. DAC Output Termination (Doubly Terminated 75 Ω Load) Reference Input and RSET An external 1.23 V voltage reference is required to drive the analog outputs of the ADV7150. The reference voltage is con- nected to the VREF input. A resistor RSET is connected between the RSET input of the part and ground. For specified performance, RSET has a value of 280 Ω. This corresponds to the generation of RS-343A video levels (with SYNC on IOG and Pedestal = 7.5 IRE) into a dou- bly terminated 75 Ω load. Figure 30 illustrates the resulting video waveform, and the Video Output Truth Table shows the corresponding control input stimuli. WHITE LEVEL IOR, IOB IOG mA mA V V 26.67 1.000 0.714 19.05 00 00 7.62 0.286 BLANK LEVEL SYNC LEVEL 92.5 IRE 7.5 IRE 40 IRE BLACK LEVEL 1.44 0.054 9.05 0.340 Figure 30. Composite Video Waveform (SYNC Decoded on IOG; Pedestal = 7.5 IRE; RSET = 280 Ω) Variations on RS-343A Various other video output configurations can be implemented by the ADV7150, including RS-170. Values of RSET for particu- lar output video formats/levels are calculated by using the equa- tions for RSET given in the “Pin Configuration” section. The table shows calculated values of RSET for some of the most com- mon variants on the RS-343A standard. The associated wave- forms are shown in the diagrams. Table V. Video Output Truth Table IOG IOR, IOB DAC Description (mA) (mA) SYNC BLANK Input Data WHITE LEVEL 26.67 19.05 1 1 3FFH VIDEO Video + 9.05 Video + 1.44 1 1 Data VIDEO to BLANK Video + 1.44 Video + 1.44 0 1 Data BLACK LEVEL 9.05 1.44 1 1 000H BLACK to BLANK 1.44 1.44 0 1 000H BLANK LEVEL 7.62 0 1 0 xxxH SYNC LEVEL 0 0 0 0 xxxH Decoded on IOG; Pedestal = 0 IRE; RSET = 265 Ω. |
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