SBAS430F January   2009  – April 2018 DAC7568 , DAC8168 , DAC8568

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Block Diagram
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Electrical Characteristics
    3. 7.3 Timing Requirements
    4. 7.4 Typical Characteristics: Internal Reference
    5. 7.5 Typical Characteristics: DAC at AVDD = 5.5 V
    6. 7.6 Typical Characteristics: DAC at AVDD = 3.6 V
    7. 7.7 Typical Characteristics: DAC at AVDD = 2.7 V
  8. 8 Detailed Description
    1. 8.1 Functional Block Diagram
    2. 8.2 Feature Description
      1. 8.2.1  Digital-to-Analog Converter (DAC)
      2. 8.2.2  Resistor String
      3. 8.2.3  Output Amplifier
      4. 8.2.4  Internal Reference
      5. 8.2.5  Serial Interface
      6. 8.2.6  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. 8.2.7  SYNC Interrupt
      8. 8.2.8  Power-on Reset to Zero Scale or Midscale
      9. 8.2.9  Clear Code Register and CLR Pin
      10. 8.2.10 Software Reset Function
      11. 8.2.11 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. 8.3 Device Functional Modes
      1. 8.3.1 Enable/Disable Internal Reference
        1. 8.3.1.1 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. 8.3.1.2 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. 8.3.2 LDAC Functionality
      3. 8.3.3 Power-Down Modes
        1. 8.3.3.1 DAC Power-Down Commands
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications - Microprocessor Interfacing
      1. 9.2.1 DAC7568/DAC8168/DAC8568 to an 8051 Interface
        1. 9.2.1.1 Detailed Design Procedure
          1. 9.2.1.1.1 Internal Reference
            1. 9.2.1.1.1.1 Supply Voltage
            2. 9.2.1.1.1.2 Temperature Drift
            3. 9.2.1.1.1.3 Noise Performance
            4. 9.2.1.1.1.4 Load Regulation
            5. 9.2.1.1.1.5 Long-Term Stability
            6. 9.2.1.1.1.6 Thermal Hysteresis
          2. 9.2.1.1.2 DAC Noise Performance
          3. 9.2.1.1.3 Bipolar Operation Using The DAC7568/DAC8168/DAC8568
      2. 9.2.2 DAC7568/DAC8168/DAC8568 to Microwire Interface
      3. 9.2.3 DAC7568/DAC8168/DAC8568 to 68HC11 Interface
  10. 10Layout
    1. 10.1 Layout Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Device Nomenclature
        1. 11.1.1.1 Static Performance
          1. 11.1.1.1.1  Resolution
          2. 11.1.1.1.2  Least Significant Bit (LSB)
          3. 11.1.1.1.3  Most Significant Bit (MSB)
          4. 11.1.1.1.4  Relative Accuracy or Integral Nonlinearity (INL)
          5. 11.1.1.1.5  Differential Nonlinearity (DNL)
          6. 11.1.1.1.6  Full-Scale Error
          7. 11.1.1.1.7  Offset Error
          8. 11.1.1.1.8  Zero-Code Error
          9. 11.1.1.1.9  Gain Error
          10. 11.1.1.1.10 Full-Scale Error Drift
          11. 11.1.1.1.11 Offset Error Drift
          12. 11.1.1.1.12 Zero-Code Error Drift
          13. 11.1.1.1.13 Gain Temperature Coefficient
          14. 11.1.1.1.14 Power-Supply Rejection Ratio (PSRR)
          15. 11.1.1.1.15 Monotonicity
        2. 11.1.1.2 Dynamic Performance
          1. 11.1.1.2.1  Slew Rate
          2. 11.1.1.2.2  Output Voltage Settling Time
          3. 11.1.1.2.3  Code Change/Digital-to-Analog Glitch Energy
          4. 11.1.1.2.4  Digital Feedthrough
          5. 11.1.1.2.5  Channel-to-Channel DC Crosstalk
          6. 11.1.1.2.6  Channel-to-Channel AC Crosstalk
          7. 11.1.1.2.7  Signal-to-Noise Ratio (SNR)
          8. 11.1.1.2.8  Total Harmonic Distortion (THD)
          9. 11.1.1.2.9  Spurious-Free Dynamic Range (SFDR)
          10. 11.1.1.2.10 Signal-to-Noise plus Distortion (SINAD)
          11. 11.1.1.2.11 DAC Output Noise Density
          12. 11.1.1.2.12 DAC Output Noise
          13. 11.1.1.2.13 Full-Scale Range (FSR)
    2. 11.2 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.6 Input Shift Register

The input shift register (SR) of the DAC7568, DAC8168, and DAC8568 is 32 bits wide (as shown in Table 1, Table 2, and Table 3, respectively), and consists of four Prefix bits (DB31 to DB28), four control bits (DB27 to DB24), 16 data bits (DB23 to DB4), and four additional feature bits. The 16 data bits comprise the 16-, 14-, or 12-bit input code.

The DAC7568, DAC8168, and DAC8568 support a number of different load commands. The load commands are summarized in Table 1.

Table 1. DAC8568 Data Input Register Format

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 
|-- Prefix Bits --| |- Control Bits -| | Address Bits | |-------------------------------------- Data Bits --------------------------------------| | Feature Bits |

Table 2. DAC8168 Data Input Register Format

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

Table 3. DAC7568 Data Input Register Format

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

Table 1. Control Matrix for the DAC7568, DAC8168, and DAC8568

DB31 DB30-DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16-DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DESCRIPTION
0 Don't
Care		 C3 C2 C1 C0 A3 A2 A1 A0 D16 D15 D14 D13-D7 D6 D5 D4 D3 D2 D1 F3 F2 F1 F0 GENERAL DATA FORMAT FOR 16-BIT DAC8568
0 Don't
Care		 C3 C2 C1 C0 A3 A2 A1 A0 D14 D13 D12 D11-D5 D4 D3 D2 D1 X X F3 F2 F1 F0 GENERAL DATA FORMAT FOR 14-BIT DAC8168
0 Don't
Care		 C3 C2 C1 C0 A3 A2 A1 A0 D12 D11 D10 D9-D3 D2 D1 X X X X F3 F2 F1 F0 GENERAL DATA FORMAT FOR 12-BIT DAC7568
1 X X X X X X X X X X X X X X X X X X X X X X X Reserved Bit - Not valid; device does not perform to specified conditions
Write to Selected DAC Input Register
0 X 0 0 0 0 0 0 0 0 Data X X X X Write to input register - DAC Channel A
0 X 0 0 0 0 0 0 0 1 Data X X X X Write to input register - DAC Channel B
0 X 0 0 0 0 0 0 1 0 Data X X X X Write to input register - DAC Channel C
0 X 0 0 0 0 0 0 1 1 Data X X X X Write to input register - DAC Channel D
0 X 0 0 0 0 0 1 0 0 Data X X X X Write to input register - DAC Channel E
0 X 0 0 0 0 0 1 0 1 Data X X X X Write to input register - DAC Channel F
0 X 0 0 0 0 0 1 1 0 Data X X X X Write to input register - DAC Channel G
0 X 0 0 0 0 0 1 1 1 Data X X X X Write to input register - DAC Channel H
0 X 0 0 0 0 1 X X X X X X X X Invalid code - No DAC channel is updated
0 X 0 0 0 0 1 1 1 1 Data X X X X Broadcast mode - Write to all DAC channels
Update Selected DAC Registers
0 X 0 0 0 1 0 0 0 0 Data X X X X Update DAC register - DAC Channel A
0 X 0 0 0 1 0 0 0 1 Data X X X X Update DAC register - DAC Channel B
0 X 0 0 0 1 0 0 1 0 Data X X X X Update DAC register - DAC Channel C
0 X 0 0 0 1 0 0 1 1 Data X X X X Update DAC register - DAC Channel D
0 X 0 0 0 1 0 1 0 0 Data X X X X Update DAC register - DAC Channel E
0 X 0 0 0 1 0 1 0 1 Data X X X X Update DAC register - DAC Channel F
0 X 0 0 0 1 0 1 1 0 Data X X X X Update DAC register - DAC Channel G
0 X 0 0 0 1 0 1 1 1 Data X X X X Update DAC register - DAC Channel H
0 X 0 0 0 1 1 X X X X X X X X Invalid code - No DAC channel is updated
0 X 0 0 0 1 1 1 1 1 Data X X X X Broadcast mode - Update all DAC registers
Write to Clear Code Register
0 X 0 1 0 1 X X X X X X X X X X X X X X X X 0 0 Write to clear code register; clear to zero scale
0 X 0 1 0 1 X X X X X X X X X X X X X X X X 0 1 Write to clear code register; clear to midscale
0 X 0 1 0 1 X X X X X X X X X X X X X X X X 1 0 Write to clear code register; clear to full-scale
0 X 0 1 0 1 X X X X X X X X X X X X X X X X 1 1 Write to clear code register; ignore CLR pin
Write to LDAC Register
0 X 0 1 1 0 X X X X X X X X X X DAC H DAC G DAC F DAC E DAC D DAC C DAC B DAC A Write to LDAC register. Default setting of these bits is '0'. If bit is set to '1', the LDAC pin is overridden. See the LDAC Functionality section for details.
Software Reset
0 X 0 1 1 1 X X X X X X X X X X X X X X X X X X Software reset (power-on reset)
Write to Selected DAC Input Register and Update All DAC Registers
0 X 0 0 1 0 0 0 0 0 Data X X X X Write to DAC input register Ch A and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 0 0 1 Data X X X X Write to DAC Input Register Ch B and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 0 1 0 Data X X X X Write to DAC Input Register Ch C and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 0 1 1 Data X X X X Write to DAC Input Register Ch D and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 1 0 0 Data X X X X Write to DAC Input Register Ch E and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 1 0 1 Data X X X X Write to DAC Input Register Ch F and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 1 1 0 Data X X X X Write to DAC Input Register Ch G and update all DAC registers (SW LDAC)
0 X 0 0 1 0 0 1 1 1 Data X X X X Write to DAC Input Register Ch H and update all DAC registers (SW LDAC)
0 X 0 0 1 0 1 X X X X X X X X Invalid code - No DAC Channel is updated
0 X 0 0 1 0 1 1 1 1 Data X X X X Broadcast mode - Write to all DAC input registers and update all DAC registers (SW LDAC)
Write to Selected DAC Input Register and Update Respective DAC Register
0 X 0 0 1 1 0 0 0 0 Data X X X X Write to DAC input register Ch A and update DAC register Ch A
0 X 0 0 1 1 0 0 0 1 Data X X X X Write to DAC Input Register Ch B and update DAC register Ch B
0 X 0 0 1 1 0 0 1 0 Data X X X X Write to DAC Input Register Ch C and update DAC register Ch C
0 X 0 0 1 1 0 0 1 1 Data X X X X Write to DAC Input Register Ch D and update DAC register Ch D
0 X 0 0 1 1 0 1 0 0 Data X X X X Write to DAC Input Register Ch E and update DAC register Ch E
0 X 0 0 1 1 0 1 0 1 Data X X X X Write to DAC Input Register Ch F and update DAC register Ch F
0 X 0 0 1 1 0 1 1 0 Data X X X X Write to DAC Input Register Ch G and update DAC register Ch G
0 X 0 0 1 1 0 1 1 1 Data X X X X Write to DAC Input Register Ch H and update DAC register Ch H
0 X 0 0 1 1 1 X X X X X X X X Invalid code - No DAC channel is updated
0 X 0 0 1 1 1 1 1 1 Data X X X X Broadcast mode - Write to all DAC input registers and update all DAC registers (SW LDAC)
Power-Down Commands
0 X 0 1 0 0 X X X X X X X X 0 0 DAC H DAC G DAC F DAC E DAC D DAC C DAC B DAC A Power-up DAC A, B, C, D, E, F, G, H by setting respective bit to '1'
0 X 0 1 0 0 X X X X X X X X 0 1 DAC H DAC G DAC F DAC E DAC D DAC C DAC B DAC A Power-down DAC A, B, C, D, E, F, G, H, 1kΩ to GND by setting respective bit to '1'
0 X 0 1 0 0 X X X X X X X X 1 0 DAC H DAC G DAC F DAC E DAC D DAC C DAC B DAC A Power-down DAC A, B, C, D, E, F, G, H, 100kΩ to GND by setting respective bit to '1'
0 X 0 1 0 0 X X X X X X X X 1 1 DAC H DAC G DAC F DAC E DAC D DAC C DAC B DAC A Power-down DAC A, B, C, D, E, F, G, H, High-Z to GND by setting respective bit to '1'
Internal Reference Commands
0 X 1 0 0 0 X X X X X X X X X X X X X X X X X 0 Power down internal reference - static mode (default), must use external reference to operate device; see Table 21
0 X 1 0 0 0 X X X X X X X X X X X X X X X X X 1 Power up internal reference - static mode; see Table 20 (NOTE: When all DACs power down, the reference powers down; when any DAC powers up, the reference powers up)
0 X 1 0 0 1 X X X X 1 0 0 X X X X X X X X X X X Power up internal reference - flexible mode; see Table 22 (NOTE: When all DACs power down, the reference powers down; when any DAC powers up, the reference powers up)
0 X 1 0 0 1 X X X X 1 0 1 X X X X X X X X X X X Power up internal reference all the time regardless of state of DACs - flexible mode; see Table 23
0 X 1 0 0 1 X X X X 1 1 0 X X X X X X X X X X X Power down internal reference all the time regardless of state of DACs - flexible mode; see Table 24 (NOTE: External reference must be used to operate device)
0 X 1 0 0 1 X X X X 0 0 0 X X X X X X X X X X X Switching internal reference mode from flexible mode to static mode
Reserved Bits
0 X 1 0 1 0 X X X X X X X X X X X X X X X X X X Reserved Bit - not valid; device does not perform to specified conditions
0 X 1 0 1 1 X X X X X X X X X X X X X X X X X X Reserved Bit - not valid; device does not perform to specified conditions
0 X 1 1 0 0 X X X X X X X X X X X X X X X X X X Reserved Bit - not valid; device does not perform to specified conditions
0 X 1 1 0 1 X X X X X X X X X X X X X X X X X X Reserved Bit - not valid; device does not perform to specified conditions
0 X 1 1 1 0 X X X X X X X X X X X X X X X X X X Reserved Bit - not valid; device does not perform to specified conditions
0 X 1 1 1 1 X X X X X X X X X X X X X X X X X X Reserved Bit - not valid; device does not perform to specified conditions