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

6.6 Linearity Analysis Tool

The linearity analysis tool measures and generates the DNL and INL plots over code for the specific ADS9110 installed in the evaluation board. A 2kHz sinusoidal input signal is required, which is slightly saturated (35mV outside the full-scale range at each input or 0.13dBFS) with very low distortion. The external source linearity must be better than the ADC linearity. The measured system performance must reflect the linearity errors of the ADC and must not be limited by the performance of the signal source. To make sure that the DNL and INL of the ADC are correctly measured, the external source must meet the requirements in Table 6-2.

Table 6-2 External Source Requirements for ADS9110 Evaluation
Specification DescriptionSpecification Value
Signal frequency2kHz
External source typeBalanced differential
External source common mode0V or floating
(see Section 2.2.2 for jumper settings)
External source impedance (RS)10Ω–30Ω
External source differential impedance
(RS_DIFF = 2 × RS)		20Ω–60Ω
Source differential signal
(VPP amplitude for –0.1 dBFS)		(2 × RS × 4.57 × 10–3) + 9.14V
or
(RS_DIFF × 4.57 × 10–3) + 9.14V
Maximum noise30µVRMS
Maximum SNR100dB
Maximum THD–130 dB

The number-of-hits setting depends on the external noise source. For a 110dB SNR external source with approximately 10µVrms of noise, the total number of hits must be 512. For a source with 100dB SNR, the recommended number of hits is 1024.

Note:

This analysis can take a couple of minutes to run and the evaluation board must remain undisturbed during the complete duration of the analysis.

Linearity Analysis ToolFigure 6-7 Linearity Analysis Tool