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DAC8564 数据表(PDF) 32 Page - Texas Instruments |
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DAC8564 数据表(HTML) 32 Page - Texas Instruments |
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32 / 51 page  DAC7565 SBAS412B – FEBRUARY 2008 – REVISED MARCH 2011 www.ti.com Example 3: Power-Down DAC A and DAC B to 1k Ω and Power-Down DAC C and DAC D to 100kΩ Simultaneously • 1st: Write power-down command to data buffer A: DAC A to 1k Ω. DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 0 0 0 0 1 0 1 X X X • 2nd: Write power-down command to data buffer B: DAC B to 1k Ω. DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 0 0 0 1 1 0 1 X X X • 3rd: Write power-down command to data buffer C: DAC C to 100k Ω. DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 0 0 1 0 1 1 0 X X X • 4th: Write power-down command to data buffer D: DAC D to 100k Ω and simultaneously update all DACs. DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 1 0 0 1 1 1 1 0 X X X The DAC A, DAC B, DAC C, and DAC D analog outputs simultaneously power-down to each respective specified mode upon completion of the fourth write sequence. Example 4: Power-Down DAC A Through DAC D to High-Impedance Sequentially • 1st: Write power-down command to data buffer A and load DAC A: DAC A output = Hi-Z: DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 1 0 0 0 1 1 1 X X X • 2nd: Write power-down command to data buffer B and load DAC B: DAC B output = Hi-Z: DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 1 0 0 1 1 1 1 X X X • 3rd: Write power-down command to data buffer C and load DAC C: DAC C output = Hi-Z: DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 1 0 1 0 1 1 1 X X X • 4th: Write power-down command to data buffer D and load DAC D: DAC D output = Hi-Z: DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12-DB4 DB3-DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 1 0 1 1 1 1 1 X X X The DAC A, DAC B, DAC C, and DAC D analog outputs sequentially power-down to high-impedance upon completion of the first, second, third, and fourth write sequences, respectively. 32 Submit Documentation Feedback Copyright © 2008–2011, Texas Instruments Incorporated Product Folder Link(s): DAC7565 |
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