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DAC8564IDPWR 数据表(PDF) 33 Page - Texas Instruments |
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DAC8564IDPWR 数据表(HTML) 33 Page - Texas Instruments |
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33 / 46 page  www.ti.com DAC8564 SBAS403A – JUNE 2007 – REVISED NOVEMBER 2007 Example 5: Power-Down All Channels Simultaneously while Reference is Always Powered Up • 1st: Write sequence for enabling the DAC8564 internal reference all the time: A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 0 0 0 0 1 0 0 0 1 X • 2nd: Write sequence to power-down all DACs to high-impedance: A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 1 1 0 1 0 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 and second write sequences, respectively. Example 6: Write a Specific Value to All DACs while Reference is Always Powered Down • 1st: Write sequence for disabling the DAC8564 internal reference all the time (after this sequence, the DAC8564 requires an external reference source to function): A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 0 0 0 0 1 0 0 1 0 X • 2nd: Write sequence to write specified data to all DACs: A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 1 1 0 1 0 0 DB15 DB14 DB13 DB12 DB11–DB0 The DAC A, DAC B, DAC C, and DAC D analog outputs simultaneously settle to the specified values upon completion of the fourth write sequence. (The DAC voltages update simultaneously after the 24th SCLK falling edge of the fourth write cycle). Reference is always powered-down. Example 7: Write a Specific Value to DAC A, while Reference is Placed in Default Mode and All Other DACs are Powered Down to High-Impedance • 1st: Write sequence for placing the DAC8564 internal reference into default mode. Alternately, this step can be replaced by performing a power-on reset (see the Power-On Reset section): A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 0 0 0 0 1 0 0 0 0 X • 2nd: Write sequence to power-down all DACs to high-impedance (after this sequence, the DAC8564 internal reference powers down automatically): A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 1 1 0 1 0 1 1 1 X X X • 3rd: Write sequence to power-up DAC A to a specified value (after this sequence, the DAC8564 internal reference powers up automatically): A1 A0 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11–DB0 (LD1) (LD0) (DAC Sel 1) (DAC Sel 0) (PD0) 0 0 0 1 0 0 0 0 DB15 DB14 DB13 DB12 DB11–DB0 The DAC B, DAC C, and DAC D analog outputs simultaneously power-down to high-impedance, and DAC A settles to the specified value upon completion. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 33 Product Folder Link(s): DAC8564 |
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