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LTC2634-HMI8 数据表(PDF) 20 Page - Linear Technology |
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LTC2634-HMI8 数据表(HTML) 20 Page - Linear Technology |
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20 / 30 page  LTC2634 20 2634fb OPERATION C3 COMMAND Input Word (LTC2634-12) ADDRESS DATA (12 BITS + 4 DON’T CARE BITS) C2 C1 C0 A3 A2 A1 A0 D9 D10 D11 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X MSB LSB C3 COMMAND Input Word (LTC2634-10) ADDRESS DATA (10 BITS + 6 DON’T CARE BITS) C2 C1 C0 A3 A2 A1 A0 D7 D8 D9 D6 D5 D4 D3 D2 D1 D0 XX X X X X MSB LSB C3 COMMAND Input Word (LTC2634-8) ADDRESS DATA (8 BITS + 8 DON’T CARE BITS) C2 C1 C0 A3 A2 A1 A0 D5 D6 D7 D4 D3 D2 D1 D0 X X XX X X X X MSB LSB 2634 F02 Table 1. Command Codes COMMAND* C3 C2 C1 C0 0 0 0 0 Write to Input Register n 0 0 0 1 Update (Power Up) DAC Register n 0 0 1 0 Write to Input Register n, Update (Power Up) All 0 0 1 1 Write to and Update (Power Up) DAC Register n 0 1 0 0 Power-Down DAC n 0 1 0 1 Power-Down Chip (All DACs and Reference) 0 1 1 0 Select Internal Reference (Power-Up Reference) 0 1 1 1 Select External Reference (Power-Down Internal Reference) 1 1 1 1 No Operation *Command codes not shown are reserved and should not be used. Table 2. Address Codes ADDRESS (n)* A3 A2 A1 A0 0000 DAC A 0001 DAC B 0010 DAC C 0011 DAC D 1 1 1 1 All DACs * Address codes not shown are reserved and should not be used. Figure 2. Command and Data Input Format of CS/LD. The rising edge of CS/LD ends the data transfer and causes the device to execute the command specified in the 24-bit input sequence. The complete sequence is shown in Figure 3a. The command (C3-C0) and address (A3-A0) assignments are shown in Tables 1 and 2. The first four commands in Table 1 consist of write and update operation. A write operation loads a 16-bit data word from the 24-bit shift register into the input register of the selected DAC, n. An update operation copies the data word from the input register to the DAC register. Once copied into the DAC register, the data word becomes the active 12-, 10- or 8-bit input code, and is converted to an analog voltage at the DAC output. Write to and update combines the first two commands. The update operation also powers up the DAC if it had been in power-down mode. The data path and registers are shown in the Block Diagram. |
类似零件编号 - LTC2634-HMI8 |
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类似说明 - LTC2634-HMI8 |
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