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STPC4EEBC 数据表(PDF) 75 Page - STMicroelectronics |
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STPC4EEBC 数据表(HTML) 75 Page - STMicroelectronics |
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75 / 93 page  DESIGN GUIDELINES Release 1.5 - January 29, 2002 75/93 6.3.10. TV INTERFACE The STPC integrates a voltage reference and video DACs. The amount of external devices is then limited to video buffers as described in the Figure 6-15. The connection from IREFx and VREFx up to the 20 ohms resistors must be as short as possible. The constraint is the same for the connection from VDDA_TV and VSSA_TV up to the decoupling capacitances. The resistors and capacitors of the amplifier stage have to be as close as possible to the video buffer. When the TV interface is not needed, the signals RED, GREEN, BLUE, CVBS, IREF1, IREF2 can be left unconnected, VDDA_TV must then be connected to GND. R,G,B,CVBS outputs: . Ioutmax = 80.704 / Rref < 5mA . Rload = 274 ohms . Vout = {10-bit code} x Rload x 0.079 / Rref Fine tuning of the maximum output level must be done using the gain control registers 0x11 to 0x13 of the integrated Digital Encoder (write the value 0x0B for a gain of 109%). Figure 6-15. Typical VGA implementation 20 1% IREF1 VREF1 IREF2 VREF2 VDDA_TV 2.5V 10nF 100nF 22uF DCLK CVBS RED GREEN BLUE 316 1% 27MHz 47pF FBEAD VSSA_TV AGND AGND AGND 33 GND 3.3V FBEAD 100nF GND same as for RED AGND 15uH AGND AGND AGND 526 1% 326 1% 478 1% 10 1% AGND VCCA To the connector 75 1% TSH74 5V 100nF 22uF FBEAD AGND FBEAD GND VCCA GND Rref = 20K 1% |
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