SLAS708A September   2010  – September 2019 ADS7947 , ADS7948 , ADS7949

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     ADS794x 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  ESD Ratings
    3. 7.3  Recommended Operating Conditions: ADS794x (12-, 10-, 8-Bit)
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics: ADS7947 (12-Bit)
    6. 7.6  Electrical Characteristics: ADS7948 (10-Bit)
    7. 7.7  Electrical Characteristics: ADS7949 (8-Bit)
    8. 7.8  Timing Requirements
    9. 7.9  Switching Characteristics
    10. 7.10 Typical Characteristics: ADS7947, ADS7948, ADS7949
    11. 7.11 Typical Characteristics: ADS7947 (12-Bit)
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Multiplexer and ADC Input
      2. 8.3.2 Reference
      3. 8.3.3 Clock
      4. 8.3.4 ADC Transfer Function
      5. 8.3.5 Power-Down
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device Operation
    5. 8.5 Programming
      1. 8.5.1 16-Clock Frame
      2. 8.5.2 32-Clock Frame
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Driving an ADC Without a Driving Op Amp
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

7.9 Switching Characteristics

at DVDD = 1.65 V to AVDD (unless otherwise noted); minimum and maximum values at TA = –40°C to +125°C, typical values at TA = 25°C
PARAMETER TEST CONDITIONS(1) MIN TYP MAX UNIT
tCONV Conversion time ADS7947 (12 bit) 13.5 SCLK
ADS7948 (10 bit) 10.5
ADS7949 (8 bit) 8.5
tD1 Delay time, CS low to first data (D0-15) out DVDD = 1.8 V 14.5 ns
DVDD = 3 V 12.5
DVDD = 5 V 8.5
tD2(2) Delay time, SCLK falling to SDO DVDD = 1.8 V 11 ns
DVDD = 3 V 9
DVDD = 5 V 7.1
tH1 Hold time, SCLK falling to data valid DVDD = 1.8 V 4 ns
DVDD = 3 V 3
DVDD = 5 V 2
tD3 Delay time, CS high to SDO 3-state DVDD = 1.8 V 15 ns
DVDD = 3 V 12.5
DVDD = 5 V 8.5
(1) 1.8-V specifications apply from 1.65 V to 2 V; 3-V specifications apply form 2.7 V to 3.6 V; 5-V specifications apply from 4.75 V to 5.25 V.
(2) With 50-pF load.
ADS7947 ADS7948 ADS7949 tim_las708.gifFigure 1. Timing Diagram