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AD8120ACPZ-RL датащи(PDF) 10 Page - Analog Devices |
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AD8120ACPZ-RL датащи(HTML) 10 Page - Analog Devices |
10 / 16 page AD8120 Rev. 0 | Page 10 of 16 ANALOG CONTROL A number of video transmission systems do not have a microcon- troller embedded or otherwise available to provide digital control. These systems require analog control. Potentiometer control is one of the most common ways to implement analog control (see Figure 25). To select analog control, set the MODE pin high. The AD8120 has one analog control input for each channel: VCR, VCG, and VCB. The maximum recommended control voltage range on these inputs is 0 V to 2.0 V, although the actual control range where delay changes take effect is smaller and lies within this larger range. An internal ADC converts the analog control voltages into binary delay codes; therefore, the analog control is discrete with nominally 0.8 ns resolution. Figure 6 illustrates the typical transfer characteristic between control voltage and delay code. DIGITAL CONTROL Set the MODE pin low to select digital control (SPI or I2C). Set the SER_SEL pin high to select SPI mode, or set the SER_SEL pin low to select I2C mode. Table 6 provides the bit values for reading and writing the red, green, and blue registers. Table 6. Read/Write Instruction and Color Registers Operation R/W Bit C1 Bit C0 Bit Write Red 0 0 0 Read Red 1 0 0 Write Green 0 0 1 Read Green 1 0 1 Write Blue 0 1 0 Read Blue 1 1 0 SPI Control The SPI bus operates in full-duplex mode and consists of four digital lines: SDI, SDO, SCK, and CS. Table 7. AD8120 SPI Pin Descriptions Pin No. Pin Name Description 29 SDI Serial data input, master out slave in (MOSI) 2 SDO Serial data output, master in slave out (MISO) 30 SCK Serial clock from master 31 CS Chip select; active low The AD8120 is programmed in SPI mode using a 2-byte sequence (see Table 8). Data is clocked into the SDI pin or clocked out of the SDO pin on the rising edge of the clock, MSB first. The first byte contains the read/write (R/W) instruction and the color reg- ister address (see ). The second byte contains the delay code to write to the part (R/ Table 6 W = 0) or the stored delay code to read from the part (R/W = 1). Figure 17 shows how to write Delay Code 42 to the green register. Figure 18 shows how to read Delay Code 21 from the blue register. Table 8. SPI 2-Byte Sequence Byte 1 (R/W Bit and Color Register) Byte 2 (Data) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 SDI R/W 0 0 0 0 0 C1 C0 X X D5 D4 D3 D2 D1 D0 SDO X X X X X X X X X X D5 D4 D3 D2 D1 D0 |
Аналогичный номер детали - AD8120ACPZ-RL |
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Аналогичное описание - AD8120ACPZ-RL |
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