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ADC drive amplifier with over voltage limit/clamp feature

Hi All,

One of my customers chooses AD9681 8ch 14bit 125MSPS ADC for his new design.

Application is high-speed camera.

Single ended image sensor output signal is fed to ADC drive amplifier and connects to AD9681.

He is now looking for suitable ADC driver amplifier.

Characteristics of image sensor output signal are as follows;

1)    Voltage amplitude: 0 to 3.0V max

2)    Amplitude to be digitized: 0.7V to 1.95V

3)    Bandwidth: 81MHz

4)    Output impedance: around 700ohm

5)    Allowable load: >1kohm, <5pF

ADC drive amplifier should have single to differential, and output voltage limit (or input voltage limit features.

I think one of candidate is AD8351, but need to add voltage clamp feature externally.

Could you advice me the suitable drive amplifier and suitable clamp circuit if need be added externally?

 

Best Regards,

Ricky

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  • Hi Ricky,

    After touching base with some colleagues, I was able to verify that we currently have 2 op-amps that provide the clamping capability that you're looking for. The AD8036 and AD8037 have the standard op-amp pins (V+, V-, Vout) and they also have Vh and Vl input pins that can set the higher and lower clamping levels respectively. One of the drawbacks is that they do require +/- 5V supplies. Feel free to pull up the datasheet on these devices and let me know if this solution will suffice the customers requirement.

    If so, then the signal flow would be single-ended image sensor->single-ended clamp-amp->AD8351(s/e to diff)->AD9681(diff)

    Thanks,

    Joe

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  • Hi Ricky,

    After touching base with some colleagues, I was able to verify that we currently have 2 op-amps that provide the clamping capability that you're looking for. The AD8036 and AD8037 have the standard op-amp pins (V+, V-, Vout) and they also have Vh and Vl input pins that can set the higher and lower clamping levels respectively. One of the drawbacks is that they do require +/- 5V supplies. Feel free to pull up the datasheet on these devices and let me know if this solution will suffice the customers requirement.

    If so, then the signal flow would be single-ended image sensor->single-ended clamp-amp->AD8351(s/e to diff)->AD9681(diff)

    Thanks,

    Joe

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