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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AD5544EVAL 데이터시트(PDF) 9 Page - Analog Devices |
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AD5544EVAL 데이터시트(HTML) 9 Page - Analog Devices |
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9 / 20 page  AD5544/AD5554 Rev. A | Page 9 of 20 Table 6. AD55541 Control-Logic Truth Table CS CLK LDAC RS MSB Serial Shift Register2 Function Input Register2 Function DAC Register H X H H X3 No Effect Latched Latched L L H H X No Effect Latched Latched L ￪+2 H H X Shift-Register-Data Advanced One Bit Latched Latched L H H H X No Effect Latched Latched ￪+2 L H H X No Effect Selected DAC Updated with Current Shift-Register Contents4 Latched H X L H X No Effect Latched Transparent H X H H X No Effect Latched Latched H X ￪+ H X No Effect Latched Latched H X H L 0 No Effect Latched Data = 0000H Latched Data = 0000H H X H L H No Effect Latched Data = 2000H Latched Data = 2000H 1 For the AD5554, data appears at the SDO Pin 17 clock pulses after input at the SDI pin. 2 ￪+ positive logic transition. 3 X = don’t care. 4 At power on both the input register and the DAC register are loaded with all zeros. Table 7. AD5544 Serial Input Register Data Format, Data Is Loaded in the MSB-First Format1 MSB LSB Bit Position B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Data Word A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 Only the last 18 bits of data clocked into the serial register (address + data) are inspected when the CS line’s positive edge returns to logic high. At this point an inter- nally generated load strobe transfers the serial register data contents (Bits D15 to D0) to the decoded DAC-input-register address determined by Bits A1 and A0. Any extra bits clocked into the AD5544 shift register are ignored; only the last 18 bits clocked in are used. If double-buffered data is not needed, the LDAC pin can be tied logic low to disable the DAC registers. Table 8. AD5554 Serial Input Register Data Format, Data Is Loaded in the MSB-First Format1 MSB LSB Bit Position B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Data Word A1 A0 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 Only the last 16 bits of data clocked into the serial register (address + data) are inspected when the CS line’s positive edge returns to logic high. At this point an internally generated load strobe transfers the serial register data contents (Bits D13 to D0) to the decoded DAC-input-register address determined by Bits A1 and A0. Any extra bits clocked into the AD5554 shift register are ignored; only the last 16 bits clocked in are used. If double-buffered data is not needed, the LDAC pin can be tied logic low to disable the DAC registers. Table 9. Address Decode A1 A0 DAC Decoded 0 0 DAC A 0 1 DAC B 1 0 DAC C 1 1 DAC D |
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