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TINA/Spice/ADS800: ADS800

ajay kumar13
Prodigy 120 points
Part Number: ADS800
Other Parts Discussed in Thread: TINA-TI, , OPA355, LMH6550

Tool/software: TINA-TI or Spice Models

Hi,


I am not getting the spice model for ADS800, Can anyone help me to get the spice model for ADS800. Second issue is, ADS800 Datasheet talks about two modes

1) Differential Mode: Input Range is 1.25V to 3.25V

2) Single ended Mode: Input Range 0.25V to 4.25V

My application is to detect the 2MHz pulse signal of 20mV peak minimum. Is ADS800 is the correct device for my application? What will be Digital output if i give input of 0V and 20mV, will both digital outputs will be same.

Regards

Ajay 

  • 0
    TI__Mastermind 44680 points

    Hi Ajay

    Is your 20mV signal ground referenced (ie. 0V to +20mV) or is there some DC offset above ground?

    Can the detection ADC be AC-coupled to the input signal, or do you need the DC (low frequency) information about the signal?

    What is the drive (output impedance) capability of the 20mV signal source?

    Best regards,

    Jim B

  • 0 in reply to Jim Brinkhurst1
    Prodigy 120 points

    Hi Jim,


    Thanks for your reply.

    20mV signal is with respect to ground, there is no DC offset. It can be AC coupled as there is no DC component in the signal. As of now we are planning to use OPA355 OP-AMP to driver the signal at the input of ADC. Actual scheme is below

    ADL5011(RF detector-Analog Devices) -----OPA355(OP-AMP- TI--removes the DC offset and with unity gain) -------  ADS800 (ADC- TI)

    Kindly do suggest, if we need to use differential mode or single mode. As precision is very important for this application. If you can suggest the ADS800 differntial mode driver scheme for the ADC, it would be very nice. 

    Thanks and Regards

    Ajay Kumar

  • 0 in reply to ajay kumar13
    TI__Mastermind 44680 points
    Hi Ajay
    This type of ADC generally has better performance and noise immunity if driven with a differential signal.
    Something like the LMH6550 would probably be OK for conversion of SE to differential for that frequency of signal.
    Best regards,
    Jim B
  • 0 in reply to Jim Brinkhurst1
    Prodigy 120 points

    Hi Jim,

    Thanks for your help.

    Best Regards