SLAS468A June   2005  – August 2016 ADS7887 , ADS7888

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Companion Products
  6. 6 Device Comparison
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics - ADS7887
    6. 8.6 Electrical Characteristics - ADS7888
    7. 8.7 Timing Requirements
    8. 8.8 Typical Characteristics
      1. 8.8.1 ADS7887 and ADS7888
      2. 8.8.2 ADS7887 Only
      3. 8.8.3 ADS7888 Only
  9. 9 Detailed Description
    1. 9.1 Overview
      1. 9.1.1 Driving the VIN and VDD Pins of the ADS7887 and ADS7888
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 ADS7887 Operation
      2. 9.3.2 ADS7888 Operation
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power-Down Mode
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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订购信息

1 Features

  • 1.25-MHz Sample Rate Serial Device
  • 10-Bit Resolution (ADS7887)
  • 8-Bit Resolution (ADS7888)
  • Zero Latency
  • 25-MHz Serial Interface
  • Supply Range: 2.35 V to 5.25 V
  • Typical Power Dissipation at 1.25 MSPS:
    • 3.8 mW at 3-V VDD
    • 8 mw at 5-V VDD
  • ±0.35 LSB INL, DNL (ADS7887)
  • ±0.15 LSB INL, ±0.1 LSB DNL (ADS7888)
  • 61 dB SINAD, –84 dB THD (ADS7887)
  • 49.5 dB SINAD, –67.5 dB THD (ADS7888)
  • Unipolar Input Range: 0 V to VDD
  • Power-Down Current: 1 µA
  • Wide Input Bandwidth: 15 MHz at 3 dB
  • 6-Pin SOT23 and SC70 Packages

2 Applications

  • Base Band Converters in Radio Communication
  • Motor Current and Bus Voltage Sensors in Digital Drives
  • Optical Networking (DWDM, MEMS-Based Switching)
  • Optical Sensors
  • Battery-Powered Systems
  • Medical Instrumentations
  • High-Speed Data Acquisition Systems
  • High-Speed Closed-Loop Systems

3 Description

The ADS7887 device is a 10-bit, 1.25-MSPS, analog-to-digital converter (ADC), and the ADS7888 device is a 8-bit, 1.25-MSPS ADC. These devices include a capacitor-based SAR A/D converter with inherent sample and hold. The serial interface in each device is controlled by the CS and SCLK signals for glueless connections with microprocessors and DSPs. The input signal is sampled with the falling edge of CS, and SCLK is used for conversion and serial data output.

The devices operate from a wide supply range from 2.35 V to 5.25 V. The low power consumption of the devices make them suitable for battery-powered applications. The devices also include a power-saving, power-down feature for when the devices are operated at lower conversion speeds.

The high level of the digital input to the device is not limited to device VDD. This means the digital input can go as high as 5.25 V when device supply is 2.35 V. This feature is useful when digital signals are coming from other circuit with different supply levels. Also this relaxes restriction on power-up sequencing.

The ADS7887 and ADS7888 are available in 6-pin SOT-23 and SC70 packages and are specified for operation from –40°C to 125°C.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
ADS7887
ADS7888		 SOT-23 (6) 2.90 mm × 1.60 mm
SC70 (6) 2.00 mm × 1.25 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Functional Block Diagram

ADS7887 ADS7888 bd_las468.gif