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ADV7127KR50 Datasheet(PDF) 9 Page - Analog Devices |
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ADV7127KR50 Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page ADV7127 –9– REV. 0 PIN FUNCTION DESCRIPTIONS Pin Mnemonic Function CLOCK Clock Input (TTL Compatible). The rising edge of CLOCK latches the R0–R9, G0–G9, B0–B9, SYNC and BLANK pixel and control inputs. It is typically the pixel clock rate of the video system. CLOCK should be driven by a dedicated TTL buffer. D0–D9 Data Inputs (TTL Compatible). Data is latched on the rising edge of CLOCK. D0 is the least significant data bit. Unused data inputs should be connected to either the regular PCB power or ground plane. IOUT Current Output. This high impedance current source is capable of directly driving a doubly terminated 75 Ω coaxial cable. RSET Full-Scale Adjust Control. A resistor (RSET) connected between this pin and GND controls the magnitude of the full-scale video signal. Note that the IRE relationships are maintained, regardless of the full-scale output current. The relationship between RSET and the full-scale output current on IOUT is given by: IOUT (mA) = 7968 × V REF(V)/RSET( Ω) COMP Compensation Pin. This is a compensation pin for the internal reference amplifier. A 0.1 µF ceramic capacitor must be connected between COMP and VAA. VREF Voltage Reference Input. An external 1.23 V voltage reference must be connected to this pin. The use of an exter- nal resistor divider network is not recommended. A 0.1 µF decoupling ceramic capacitor should be connected between VREF and VAA. VAA Analog Power Supply (5 V ± 5%). All V AA pins on the ADV7127 must be connected. GND Ground. All GND pins must be connected. IOUT Differential Current Output. Capable of directly driving a doubly terminated 75 Ω load. If not required, this out- put should be tied to ground. PSAVE Power Save Control Pin. The part is put into standby mode when PSAVE is low. The internal voltage reference circuit is still active on the TSSOP in this case. PDOWN Power-Down Control Pin (24-Lead TSSOP Only). The ADV7127 completely powers down, including the voltage reference circuit, when PDOWN is low. TERMINOLOGY Color Video (RGB) This usually refers to the technique of combining the three primary colors of red, green and blue to produce color pictures within the usual spectrum. In RGB monitors, three DACs are required, one for each color. Gray Scale The discrete levels of video signal between reference black and reference white levels. A 10-bit DAC contains 1024 different levels, while an 8-bit DAC contains 256. Raster Scan The most basic method of sweeping a CRT one line at a time to generate and display images. Reference Black Level The maximum negative polarity amplitude of the video signal. Reference White Level The maximum positive polarity amplitude of the video signal. Video Signal That portion of the composite video signal which varies in gray scale levels between reference white and reference black. Also referred to as the picture signal, this is the portion that may be visually observed. |
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