JAJS398F January   2009  – April 2018 DAC7568 , DAC8168 , DAC8568

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     ブロック図
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 Electrical Characteristics
    3. 8.3 Timing Requirements
    4. 8.4 Typical Characteristics: Internal Reference
    5. 8.5 Typical Characteristics: DAC at AVDD = 5.5 V
    6. 8.6 Typical Characteristics: DAC at AVDD = 3.6 V
    7. 8.7 Typical Characteristics: DAC at AVDD = 2.7 V
  9. 9 Detailed Description
    1. 9.1 Functional Block Diagram
    2. 9.2 Feature Description
      1. 9.2.1  Digital-to-Analog Converter (DAC)
      2. 9.2.2  Resistor String
      3. 9.2.3  Output Amplifier
      4. 9.2.4  Internal Reference
      5. 9.2.5  Serial Interface
      6. 9.2.6  Input Shift Register
        1. Table 1. DAC8568 Data Input Register Format
        2. Table 2. DAC8168 Data Input Register Format
        3. Table 3. DAC7568 Data Input Register Format
      7. 9.2.7  SYNC Interrupt
      8. 9.2.8  Power-on Reset to Zero Scale or Midscale
      9. 9.2.9  Clear Code Register and CLR Pin
      10. 9.2.10 Software Reset Function
      11. 9.2.11 Operating Examples: DAC7568/DAC8168/DAC8568
        1. Table 4.   1st: Write to Data Buffer A:
        2. Table 5.   2nd: Write to Data Buffer B:
        3. Table 6.   3rd: Write to Data Buffer G:
        4. Table 7.   4th: Write to Data Buffer H and Simultaneously Update all DACs:
        5. Table 8.   1st: Write to Data Buffer C and Load DAC C: DAC C Output Settles to Specified Value Upon Completion:
        6. Table 9.   2nd: Write to Data Buffer D and Load DAC D: DAC D Output Settles to Specified Value Upon Completion:
        7. Table 10. 3rd: Write to Data Buffer E and Load DAC E: DAC E Output Settles to Specified Value Upon Completion:
        8. Table 11. 4th: Write to Data Buffer F and Load DAC F: DAC F Output Settles to Specified Value Upon Completion:
        9. Table 12. 1st: Write Power-Down Command to DAC Channel A and DAC Channel B: DAC A and DAC B to 1kΩ.
        10. Table 13. 2nd: Write Power-Down Command to DAC Channel H: DAC H to 1kΩ.
        11. Table 14. 3rd: Write Power-Down Command to DAC Channel C and DAC Channel D: DAC C and DAC D to 100kΩ.
        12. Table 15. 4th: Write Power-Down Command to DAC Channel F: DAC F to 100kΩ.
        13. Table 16. 1st: Write Sequence for Enabling the DAC7568, DAC8168, and DAC8568 Internal Reference All the Time:
        14. Table 17. 2nd: Write Sequence to Power-Down All DACs to High-Impedance:
        15. Table 18. 1st: Write Sequence for Disabling the DAC7568, DAC8168, and DAC8568 Internal Reference All the Time (after this sequence, these devices require an external reference source to function):
        16. Table 19. 2nd: Write Sequence to Write Specified Data to All DACs:
    3. 9.3 Device Functional Modes
      1. 9.3.1 Enable/Disable Internal Reference
        1. 9.3.1.1 Static Mode
          1. Table 20. Write Sequence for Enabling Internal Reference (Static Mode) (Internal Reference Powered On—08000001h)
          2. Table 21. Write Sequence for Disabling Internal Reference (Static Mode) (Internal Reference Powered On—08000000h)
        2. 9.3.1.2 Flexible Mode
          1. Table 22. Write Sequence for Enabling Internal Reference (Flexible Mode) (Internal Reference Powered On—09080000h)
          2. Table 23. Write Sequence for Enabling Internal Reference (Flexible Mode) (Internal Reference Always Powered On—090A0000h)
          3. Table 24. Write Sequence for Disabling Internal Reference (Flexible Mode) (Internal Reference Always Powered Down—090C0000h)
          4. Table 25. Write Sequence for Switching from Flexible Mode to Static Mode for Internal Reference (Internal Reference Always Powered Down—09000000h)
      2. 9.3.2 LDAC Functionality
      3. 9.3.3 Power-Down Modes
        1. 9.3.3.1 DAC Power-Down Commands
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications - Microprocessor Interfacing
      1. 10.2.1 DAC7568/DAC8168/DAC8568 to an 8051 Interface
        1. 10.2.1.1 Detailed Design Procedure
          1. 10.2.1.1.1 Internal Reference
            1. 10.2.1.1.1.1 Supply Voltage
            2. 10.2.1.1.1.2 Temperature Drift
            3. 10.2.1.1.1.3 Noise Performance
            4. 10.2.1.1.1.4 Load Regulation
            5. 10.2.1.1.1.5 Long-Term Stability
            6. 10.2.1.1.1.6 Thermal Hysteresis
          2. 10.2.1.1.2 DAC Noise Performance
          3. 10.2.1.1.3 Bipolar Operation Using The DAC7568/DAC8168/DAC8568
      2. 10.2.2 DAC7568/DAC8168/DAC8568 to Microwire Interface
      3. 10.2.3 DAC7568/DAC8168/DAC8568 to 68HC11 Interface
  11. 11Layout
    1. 11.1 Layout Guidelines
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デバイスの項目表記
        1. 12.1.1.1 静的特性
          1. 12.1.1.1.1  分解能
          2. 12.1.1.1.2  最下位ビット(LSB)
          3. 12.1.1.1.3  最上位ビット(MSB)
          4. 12.1.1.1.4  相対精度または積分非直線性(INL)
          5. 12.1.1.1.5  微分非直線性(DNL)
          6. 12.1.1.1.6  フルスケール誤差
          7. 12.1.1.1.7  オフセット誤差
          8. 12.1.1.1.8  ゼロ・コード誤差
          9. 12.1.1.1.9  ゲイン誤差
          10. 12.1.1.1.10 フルスケール誤差ドリフト
          11. 12.1.1.1.11 オフセット誤差ドリフト
          12. 12.1.1.1.12 ゼロ・コード誤差ドリフト
          13. 12.1.1.1.13 ゲイン温度係数
          14. 12.1.1.1.14 電源除去率(PSRR)
          15. 12.1.1.1.15 単調性
        2. 12.1.1.2 動的特性
          1. 12.1.1.2.1  スルー・レート
          2. 12.1.1.2.2  出力電圧のセトリング時間
          3. 12.1.1.2.3  コード変化/デジタル-アナログ・グリッチ・エネルギー
          4. 12.1.1.2.4  デジタル・フィードスルー
          5. 12.1.1.2.5  チャネル間DCクロストーク
          6. 12.1.1.2.6  チャネル間ACクロストーク
          7. 12.1.1.2.7  信号対雑音比(SNR)
          8. 12.1.1.2.8  全高調波歪み(THD)
          9. 12.1.1.2.9  スプリアスフリー・ダイナミック・レンジ(SFDR)
          10. 12.1.1.2.10 信号対雑音比+歪み(SINAD)
          11. 12.1.1.2.11 DAC出力ノイズ密度
          12. 12.1.1.2.12 DAC出力ノイズ
          13. 12.1.1.2.13 フルスケール範囲(FSR)
    2. 12.2 関連リンク
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

9.3.1.2 Flexible Mode

(see Table 22, Table 23, and Table 24)

Enabling Internal Reference:

Method 1) To enable the internal reference, write the 32-bit serial command shown in Table 22. When performing a power cycle to reset the device, the internal reference is switched off (default mode). In the default mode, the internal reference is powered down until a valid write sequence is applied to power up the internal reference. If the internal reference is powered up, it automatically powers down when all DACs power down in any of the power-down modes (see the Power Down Modes section). The internal reference powers up automatically when any DAC is powered up.

Method 2) To always enable the internal reference, write the 32-bit serial command shown in Table 23. When the internal reference is always enabled, any power-down command to the DAC channels does not change the internal reference operating mode. When performing a power cycle to reset the device, the internal reference is switched off (default mode). In the default mode, the internal reference is powered down until a valid write sequence is applied to power up the internal reference. When the internal reference is powered up, it remains powered up, regardless of the state of the DACs.

Disabling Internal Reference:

To disable the internal reference, write the 32-bit serial command shown in Table 24. When performing a power cycle to reset the device, the internal reference is switched off (default mode).

When the internal reference is operated in Flexible mode, Static mode is disabled and does not work. To switch from Flexible mode to Static mode, use the command shown in Table 25.

Table 22. Write Sequence for Enabling Internal Reference (Flexible Mode)
(Internal Reference Powered On—09080000h)

DB31 DB27 DB23 DB19 DB4 DB0
0 X X X C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 F3  F2  F1  F0 
0 X X X 1 0 0 1 X X X X 1 0 0 X X X X X X X X X X X X X X X X X
|-- Prefix Bits --| |- Control Bits -| | Address Bits | |-------------------------------------- Data Bits --------------------------------------| | Feature Bits |

Table 23. Write Sequence for Enabling Internal Reference (Flexible Mode)
(Internal Reference Always Powered On—090A0000h)

DB31 DB27 DB23 DB19 DB4 DB0
0 X X X C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 F3  F2  F1  F0 
0 X X X 1 0 0 1 X X X X 1 0 1 X X X X X X X X X X X X X X X X X
|-- Prefix Bits --| |- Control Bits -| | Address Bits | |-------------------------------------- Data Bits --------------------------------------| | Feature Bits |

Table 24. Write Sequence for Disabling Internal Reference (Flexible Mode)
(Internal Reference Always Powered Down—090C0000h)

DB31 DB27 DB23 DB19 DB4 DB0
0 X X X C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 F3  F2  F1  F0 
0 X X X 1 0 0 1 X X X X 1 1 0 X X X X X X X X X X X X X X X X X
|-- Prefix Bits --| |- Control Bits -| | Address Bits | |-------------------------------------- Data Bits --------------------------------------| | Feature Bits |

Table 25. Write Sequence for Switching from Flexible Mode to Static Mode for Internal Reference
(Internal Reference Always Powered Down—09000000h)

DB31 DB27 DB23 DB19 DB4 DB0
0 X X X C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 F3  F2  F1  F0 
0 X X X 1 0 0 1 X X X X 0 0 0 X X X X X X X X X X X X X X X X X
|-- Prefix Bits --| |- Control Bits -| | Address Bits | |-------------------------------------- Data Bits --------------------------------------| | Feature Bits |