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ADS1014-Q1: Please recommend ADC for my customer.

Chase Jeong
Genius 4740 points
Part Number: ADS1014-Q1
Other Parts Discussed in Thread: ADS1014, ADS1013

Hello TI experts,

My customer now designs temp/humidity sensor for car. and they considers ADS1014 for ADC.

The condition is as below;

1. VDD : 5.1V (actual voltage from DCDC)

2. Analog voltage : 0V~5.0V

My question is as below;

if the input voltage is almost 5V(analog), would it be convert well to digital value with ADS1014?

if it is not because VDD and input voltage is almost same, Please give me another solution. (i.e. using another device or change the value of VDD, or other solution..)

Also please check that it is necessary to insert pull-up resistor between ADS1014 and level shifter.
(the data flow is as follows; (analog data)->(ADS1014)->(I2C 5V to 3.3V level shifter)->(Processor), they already use pullup resistor between level shifter and processor. should we insert pullup resistor between ADS1014 and level shifter additionally?

Please check this issue. Thanks.

Best regards,
Chase

  • 0
    TI__Intellectual 2770 points

    Hi Chase,

    Chase Jeong said:
    if the input voltage is almost 5V(analog), would it be convert well to digital value with ADS1014?

    Yes, the ADS1014 can measure analog inputs up to ±6.144V by selecting the appropriate PGA configuration in the Config register. The ±6.144 V full-scale range allows input voltages to extend up to the supply. You may read more details about the analog inputs in section 8.3.3 of the data sheet.

    Chase Jeong said:
    Also please check that it is necessary to insert pull-up resistor between ADS1014 and level shifter.

    Pullup resistors to VDD are required on both the SDA and SCL lines because I2C bus drivers are open drain, 1kΩ to 10kΩ are typically used.

    They should be installed between the ADS1014 and the level shifter, otherwise there is no way the lines can be pulled up to a logic HIGH and you would only get logic LOW readings from the I2C level shifter. You can refer to section 9 of the data sheet for examples of typical connections of the ADS1014. 

    Best Regards,

    Angel

  • 0 in reply to Angel Rodriguez de San Miguel Bermudez
    Genius 4740 points

    Dear Angel,

    Thank you for your support. I will discuss it with my customer.

    and Could you review the schematic for my customer?

    VDD is 5.1V, and AIN0 has 0V~5.0V range as i said.

    Please check this issue. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Intellectual 2770 points

    Hi Chase,

    The schematic looks ok for the most part. To be able to measure single ended inputs however, the ADS1013 and ADS1014 require AIN1 to be connected to GND externally. You can read more about this in section 9.1.2 of the data sheet.

    Best Regards,

    Angel