SLAS605C June   2008  – July 2018 ADS7950 , ADS7951 , ADS7952 , ADS7953 , ADS7954 , ADS7955 , ADS7956 , ADS7957 , ADS7958 , ADS7959 , ADS7960 , ADS7961

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     Detailed Block Diagram
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions: TSSOP Packages
    2.     Pin Functions: VQFN Packages
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: TSSOP
    5. 7.5  Thermal Information: VQFN
    6. 7.6  Electrical Characteristics: ADS7950, ADS7951, ADS7952, ADS7953
    7. 7.7  Electrical Characteristics, ADS7954, ADS7955, ADS7956, ADS7957
    8. 7.8  Electrical Characteristics, ADS7958, ADS7959, ADS7960, ADS7961
    9. 7.9  Timing Requirements
    10. 7.10 Typical Characteristics (All ADS79xx Family Devices)
    11. 7.11 Typical Characteristics (12-Bit Devices Only)
    12. 7.12 Typical Characteristics (12-Bit Devices Only)
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Reference
      2. 8.3.2 Power Saving
    4. 8.4 Device Functional Modes
      1. 8.4.1 Channel Sequencing Modes
      2. 8.4.2 Device Programming and Mode Control
        1. 8.4.2.1 Mode Control Register
        2. 8.4.2.2 Program Registers
      3. 8.4.3 Device Power-Up Sequence
      4. 8.4.4 Operating in Manual Mode
      5. 8.4.5 Operating in Auto-1 Mode
      6. 8.4.6 Operating in Auto-2 Mode
      7. 8.4.7 Continued Operation in a Selected Mode
    5. 8.5 Programming
      1. 8.5.1 Digital Output
      2. 8.5.2 GPIO Registers
      3. 8.5.3 Alarm Thresholds for GPIO Pins
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Analog Input
    2. 9.2 Typical Applications
      1. 9.2.1 Unbuffered Multiplexer Output (MXO)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 OPA192 Buffered Multiplexer Output (MXO)
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.4.4 Operating in Manual Mode

The flowchart in Figure 50 illustrates the steps involved in operating in manual channel sequencing mode. Table 1 lists the mode control register settings for manual mode. There are no program registers in manual mode.

ADS7950 ADS7951 ADS7952 ADS7953 ADS7954 ADS7955 ADS7956 ADS7957 ADS7958 ADS7959 ADS7960 ADS7961 man_mode_las605.gifFigure 50. Entering and Running in Manual Channel Sequencing Mode

Figure 51 shows an example in which manual mode is used to scan channels 4, 7, and 9. The command to select channel 4 (CH4) is issued in the Nth frame and the data corresponding to CH4 is available in the (N + 2)th frame. Internally, the SDI command is parsed and on the rising edge of CS of the (N+1)th frame and the MUX switches accordingly on the second falling edge of SCLK in this frame. On the rising edge of CS of the (N+2)th frame, the input signal for CH4 is sampled and the ADC sends the conversion data in this third frame. The device follows the same steps and the ADC sends the conversion data for CH7 and CH9 in the subsequent two frames.

ADS7950 ADS7951 ADS7952 ADS7953 ADS7954 ADS7955 ADS7956 ADS7957 ADS7958 ADS7959 ADS7960 ADS7961 manual_mode_SLAS605C.gifFigure 51. Example Manual Mode Timing Diagram

Table 1. Mode Control Register Settings for Manual Mode

BITS RESET STATE LOGIC STATE FUNCTION
DI15-12 0001 0001 Selects Manual Mode
DI11 0 1 Enables programming of bits DI06-00.
0 Device retains values of DI06-00 from the previous frame.
DI10-07 0000 This four bit data represents the address of the next channel to be selected in the next frame. DI10: MSB and DI07: LSB. For example, 0000 represents channel- 0, 0001 represents channel-1 and so forth.
DI06 0 0 Selects 0 to VREF input range (Range 1)
1 Selects 0 to 2xVREF input range (Range 2)
DI05 0 0 Device normal operation (no powerdown)
1 Device powers down on 16th SCLK falling edge
DI04 0 0 SDO outputs current channel address of the channel on DO15..12 followed by 12 bit conversion result on DO11..00.
1 GPIO3-GPIO0 data (both input and output) is mapped onto DO15-DO12 in the order shown below. Lower data bits DO11-DO00 represent 12-bit conversion result of the current channel.
DOI5 DOI4 DOI3 DOI2
GPIO3(1) GPIO2(1) GPIO1(1) GPIO0(1)
DI03-00 0000 GPIO data for the channels configured as output. Device will ignore the data for the channel which is configured as input. SDI bit and corresponding GPIO information is given below
DI03 DI02 DI01 DI00
GPIO3(1) GPIO2(1) GPIO1(1) GPIO0(1)
(1) GPIO 1 to 3 are available only in TSSOP packaged devices. QFN device offers GPIO 0 only.