SBAU249A October   2015  – July 2025 ADS9110

 

  1.   1
  2.   2
  3.   Trademarks
  4. 1Evaluation Module Overview
    1. 1.1 ADS9110EVM-PDK Features
    2. 1.2 ADS9110EVM Features
  5. 2Analog Interface
    1. 2.1 Connectors for Differential Signal Source
    2. 2.2 ADC Differential Input Signal Driver
      1. 2.2.1 Input Signal Path
      2. 2.2.2 Input Common-Mode Jumper Configuration
      3. 2.2.3 R1 Setting vs Source Impedance
    3. 2.3 Onboard ADC Reference
  6. 3Digital Interfaces
    1. 3.1 multiSPI® for ADC Digital IO
  7. 4Power Supplies
  8. 5 ADS9110EVM-PDK Initial Setup
    1. 5.1 Default Jumper Settings
    2. 5.2 EVM Graphical User Interface (GUI) Software Installation
  9. 6 ADS9110EVM-PDK Operation
    1. 6.1 EVM GUI Global Settings for ADC Control
    2. 6.2 Register Map Configuration Tool
    3. 6.3 Time Domain Display Tool
    4. 6.4 Spectral Analysis Tool
    5. 6.5 Histogram Tool
    6. 6.6 Linearity Analysis Tool
  10. 7Hardware Design Files
    1. 7.1 Schematics
    2. 7.2 PCB Layout
    3. 7.3 Bill of Materials
  11. 8Revision History

2.2.2 Input Common-Mode Jumper Configuration

The ADS9110EVM board accommodates three external source common-mode options: 0V, 2.5V, and floating with jumpers J1 and J2; see Figure 2-2 and Table 2-3.

J2 selects the OPA625 common-mode as 2.5V (J2:OPEN) or 1.25V (J2:CLOSED). J1 increases the OPA625 common-mode by almost 100mV to avoid amplifier output saturation with full-scale external source signal amplitude. R1 is installed as 280kΩ, allowing full-scale external source signals for external source impedance (RS) between 0Ω and 32Ω, with 0V common mode. R1 must be changed to compensate for larger external source impedance (RS) values or for 2.5V external source common-mode, as explained in Section 2.2.3.

Common-Mode Selection JumpersFigure 2-2 Common-Mode Selection Jumpers
Table 2-3 J1 and J2 Configuration per Input Common-Mode
J1 Setting
(R1 Comp)		J2 SettingExternal Signal Common-ModeDifferential Source Type
CLOSEDCLOSED0VBipolar: If R1 = 280kΩ, RS range is 0Ω to 32Ω
CLOSEDOPEN2.5VUnipolar: must change R1 to match RS
CLOSEDOPENFloatingAC-coupled bipolar: If R1 = 280kΩ, no RS restriction