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TDA9209 bảng dữ liệu(PDF) 3 Page - STMicroelectronics |
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TDA9209 bảng dữ liệu(HTML) 3 Page - STMicroelectronics |
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3 / 22 page ![]() TDA9209 3/22 3 - BLOCK DIAGRAM 4 - FUNCTIONAL DESCRIPTION 4.1 RGB Input The three RGB inputs have to be supplied through coupling capacitors (100 nF). The maximum input peak-to-peak video amplitude is 1 V. The input stage includes a clamping function. The clamp uses the input serial capacitor as a ”memo- ry capacitor”. To avoid a discharge of the serial capacitor during the line (due to leakage current), the input voltage is referenced to the ground. The clamp is gated by an internally generated ”Back Porch Clamping Pulse” (BPCP). Register 8 allows to choose the way to generate this BPCP (see Figure 1). When bit 0 is set to 0, the BPCP is synchronized on the trailing or leading edge of HSYNC (Pin 23) (bit 1 = 0: trailing edge, bit 1 = 1: leading edge). BLK FBLK VCCP OUT1 CO1/FB1 GNDP OUT2 CO2/FB2 OUT3 CO3/FB3 IN1 IN2 IN3 ABL GNDL GNDA VCCA AV HSYNC SDA SCL OSD1 OSD2 OSD3 or BPCP TDA9209 20 12 24 1 3 5 2 4 6 7 8 23 14 13 9 10 11 16 17 15 19 18 22 21 Output Clamp Pulse (OCL) Output Stage Drive Contrast VREF Clamp Green Channel Blue Channel Contrast/8bit Latches I2C Bus Decoder D/A BPCP OSD Cont. 4bits Drive 3x8bits Brightness 8bits VREF Output DC Level 4bits I C Cut-off 8bits see Figure 12 for complete BPCP and OCL generation diagram |
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