SLWU067D November   2009  – March 2022 ADS4122 , ADS4125 , ADS4126 , ADS4128 , ADS4129 , ADS4142 , ADS4145 , ADS4146 , ADS4149 , ADS41B25 , ADS41B29 , ADS41B49 , ADS58B18 , ADS58B19

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 Purpose
    2. 1.2 EVM Quick-Start Procedure
  3. 2Circuit Description
    1. 2.1 Schematic Diagram
    2. 2.2 Circuit Function
      1. 2.2.1 Power
        1. 2.2.1.1 Power Supply Option 1
        2. 2.2.1.2 Power Supply Option 2
        3. 2.2.1.3 Power Supply Option 3
      2. 2.2.2 Clock Input
        1. 2.2.2.1 Clock Option 1
        2. 2.2.2.2 Clock Option 2
        3. 2.2.2.3 Clock Option 3
      3. 2.2.3 Analog Inputs
        1. 2.2.3.1 Analog Input Option 1
        2. 2.2.3.2 Analog Input Option 2
      4. 2.2.4 Digital Outputs
  4. 3TI ADC SPI Control Interface
    1. 3.1 Installing the ADC SPI Interface
    2. 3.2 Setting Up the EVM for ADC SPI Control
    3. 3.3 Using the TI ADC SPI Interface Software
      1. 3.3.1 SPI Register Writes
  5. 4Quick Start Setup
  6. 5Evaluation
    1. 5.1 Register Programming
    2. 5.2 Quick-Test Results

1.2 EVM Quick-Start Procedure

The ADS41xx/58B18EVM provides numerous options for providing clock, input frequency, and power to the ADC under evaluation. The quick-start procedure describes how to quickly get initial results using the default configuration of the EVM as it was shipped. The EVM can be put back to default configuration by setting all jumpers with the default values as described in Table 1-1. The default configuration of the EVM is for single-ended signals into the analog input and clock input. These signals are converted from single-ended to differential on-board with the use of transformers. The default configuration for the power supply is to provide a single 3.3-V supply to the red banana jack J16, PWR_IN. The default configuration for the EVM is to control the modes of operation by jumper settings for parallel input control pins rather than serial SPI control of the register space. The other modes of operation of the EVM are described in the latter sections of this document.

CAUTION:

Voltage Limits: Exceeding the maximum input voltages can damage EVM components. Undervoltage can cause improper operation of some or all of the EVM components.

A quick-setup procedure for the default configuration of the ADS41xx/58B18EVM follows:

  1. Verify all jumper settings against the schematic jumper list in Table 1-1.
    Table 1-1 Jumper List
    Jumper Function Default Jumper Setting
    Interface Circuit Operational Amplifier THS4509 (Bypassed)
    R94/95/98/106 AMP+ R94/98
    R82/96/97/99 AMP– R97
    JP7 PD 1-2
    ADC Circuit
    JP12 Parallel 1-2
    JP11 SDA Open
    JP9 SEN 1-2
    JP15 OE Open
    J2 DFS 7-8
    J1 SEN 7-8
    Clock Interface Circuit CDCE72010 (Bypassed)
    R81/107 CLOCK IN R81
    R113/114/115 CLOCK IN, Y0, Y1P SELECT R115
    R108/110 Y1N SELECT R110
    JP1 PWRDWN CDC 1-2
    Power Supply
    JP13 1.8VA_IN 1-2
    JP14 1.8VD_IN 1-2
    JP3 3.3V CDC 1-2
    JP17 3.3V input select for LDO or switching regulator 1-2
    JP19 1.8V output select from LDO or switching regulator 1-2
  2. Connect the 3.3-V supply between J16 and J12 (GND). Do not connect a voltage source greater than 3.6 V.
  3. Switch on external 3.3-V power supply.
  4. Using a function generator with 50-Ω output impedance, generate a 0-V offset, 1.5-Vpp sine-wave clock into J19. The frequency of the clock must be within the specification for the device speed grade.
  5. Use a frequency generator with a 50-Ω output impedance to provide a 0-V offset, –1-dBFS-amplitude sine-wave signal into J6. This provides a transformer-coupled differential input signal to the ADC.
  6. Connect the TSW1400 or suitable logic analyzer to J10 to capture the resulting digital data. If a TSW1400 is being used to capture data, follow the additional alphabetically labeled steps. For more information, see Section 5.
    1. After installing HSDC Pro and connecting the TSW1400 to the USB port, open HSDC Pro.
    2. In HSDC Pro, when the Select Board window appears, select the interface board being used and click OK.
    3. In the Select a Device window, select ADC in the drop-down menu.
    4. In the main window, under Select ADC, use the drop-down menu to select the device under test.
    5. Under Test Selection, select Single Tone to run a single tone FFT test.
    6. Change the ADC Output Data Rate and ADC Input Target Frequency to match those of the signal generator.
    7. Press the Capture button to begin capturing data.