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Original question:

ADS1261: AD4111 replacement

ADS8688: ADC solution recommendation

Yuting Li
Intellectual 1420 points

Part Number: ADS8688

Hi team,

My customer need an ADC and the requirements is shown as below:

  • Resolution: 24bit
  • Signal: ±10V voltage signal and 0-20mA current signal
  • Channel: support 8 single-end or 4 differential input
  • Sample rate: 6.2kSPS (161us)
  • Interface: SPI
  • Protection: Input OCP or OVP

Do you have any recommendations? Thanks.

  • 0
    TI__Mastermind 23050 points

    Hi Yuting,

    As per your previous post it looks like you were already working with Bryan Lizon for this, correct?

    Best,

    Zak

  • 0 in reply to Zak Kaye
    TI__Intellectual 1420 points

    Yes, but Bryan is on vocation until August. Customer need the solution by this week. Do you have any recommendation? Thanks.

  • 0 in reply to Yuting Li
    TI__Mastermind 23050 points

    Hi Yuting,

    I don't believe we have a fully integrated solution that fits these exact requirements, but here is an example of a discrete solution you might consider:

    Parameter

    Value

    Number of Inputs

    4 (group isolated)

    Input Type

    Voltage and Current, selectable in groups of 2

    Input Ranges

    Voltage: ±10V, 0-10V, ±5V, 0-5V, 1-5V

    Current: 4-20mA, 0-20mA, 4-24mA, ±20mA

    Input Over-Range

    Up to ±130%

    Fault Protection

    ±35V (Voltage or Current Inputs)

    Input Impedance

    Voltage: 10MΩ

    Current: 249Ω

    Channel Throughput Rate

    (w/ external MUX)

    200µs/Channel or 5kHz-Channel

    Resolution (@ 200µs/Ch)

    Effective Resolution: 17bits

    Noise-Free Resolution: 14.5bits

    Accuracy, TA = 0 to 85°C*

    Voltage: ±0.2% of full scale

    Current: ±0.3% of full scale

    Channel-Channel Crosstalk

    15µV/V

    Isolation

    Between +24V supply and analog input

    Between USB and analog input

    Best,

    Zak