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DM385 数据表(PDF) 101 Page - Texas Instruments |
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DM385 数据表(HTML) 101 Page - Texas Instruments |
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101 / 281 page  DM385, DM388 www.ti.com SPRS821D – MARCH 2013 – REVISED DECEMBER 2013 3.3.25 Video Output (Analog, TV) Table 3-54. Video Output (Analog, TV) Terminal Functions SIGNAL NAME [1] DESCRIPTION [2] TYPE [3] AAR BALL [4] HDDAC_A Analog HD Video DAC (G/Y). This pin should be O A9 connected to ground through a 165-ohm resistor. HDDAC_B Analog HD Video DAC (B/Pb). This pin should be O A8 connected to ground through a 165-ohm resistor. HDDAC_C Analog HD Video DAC (R/Pr). This pin should be O B8 connected to ground through a 165-ohm resistor. HDDAC_HSYNC Analog HD Video DAC Discrete HSYNC Output O E9 HDDAC_IREF Video DAC reference current. When the video DACs are I/O B6 used, this pin should be connected to ground through a 2.67K-ohm resistor. When the video DACs are powered down, this pin should be left unconnected. HDDAC_VREF Video DAC reference voltage. When the video DACs are I B7 powered down, this pin should be left unconnected. HDDAC_VSYNC Analog HD Video DAC Discrete VSYNC Output O D9 TV_OUT0 Composite Amplifier Output. In Normal mode (internal O B9 amplifier used), this pin drives the 75-Ohm TV load. An external resistor (Rout) should be connected between this pin and the TV_VFB0 pin and be placed as close to the pins as possible. The nominal value of Rout is 2700 Ohm. In TVOUT Bypass mode (internal amplifier not used), this pin is not used. When this pin is not used or the TV output is powered-down, this pin should be left unconnected. TV_RSET TV Input Reference Current Setting. An external resistor A B11 (Rset) should be connected between this pin and VSSA_VDAC to set the reference current of the video DAC. The value of the resistor depends on the mode of operation. In Normal mode (internal amplifier used), the nominal value for Rset is 4700 Ohm. In TVOUT Bypass mode (internal amplifier not used), the nominal value for Rset is 10000 Ohm. When the TV output is not used, this pin should be connected to ground (VSS). TV_VFB0 Composite Feedback. In Normal mode (internal amplifier O B10 used), this pin acts as the buffer feedback node. An external resistor (Rout) should be connected between this pin and the TV_OUT0 pin. In TVOUT Bypass mode (internal amplifier not used), this pin acts as the direct Video DAC output and should be connected to ground through a load resistor (Rload) and to an external video amplifier. The nominal value of Rload is 1500 Ohm. When this pin is not used or the TV output is powered- down, this pin should be left unconnected. Copyright © 2013, Texas Instruments Incorporated Device Pins 101 Submit Documentation Feedback Product Folder Links: DM385 DM388 |
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