Choosing an ADC free of external clock signals

Lior Golgher

Other Parts Discussed in Thread: LMX2581, ADC3224

Greetings,

I would like to convert the analog output of a PDB460C-AC photodetector into digital pulses. I use it to track a nearly sinusoidal signal modulation that occurs at ~200 kHz and I would like to track it with at least 8 bit precision, so my sampling rate should be 100 MSPS or higher. Each bit should be fed into a separate coaxial cable, so a parallel interface is required.

All the ADCs I've found that match these requirements need an external clock input, or an external ENCODE input that can be fed by a sinusoidal input. Can you please advise if there's a suitable ADC that uses an internal clock? Otherwise, Can you please suggest an ADC + clock combination that suits my needs?

Many thanks,

Lior

over 9 years ago

0 RJ Hopper over 9 years ago

TI__Mastermind 18095 points

The ADC3224 is a dual 12-bit, 125MSPS, low power ADC that is suitable. You can power down one channel if needed. You can clock the device with the LMX2581 synthesizer or with a more narrow LMK clocking device that you can find on TI.com. --RJH

0 Lior Golgher over 9 years ago in reply to RJ Hopper

Prodigy 130 points

Thanks a lot! Eventually I've opted for the ADS4129EVM, allowing solderless access to a 12-bit, 250MSPS ADC. I'll use it with an inline CPRO33-20.000 20 MHz oscillator. It's more expensive but seemingly foolproof, which is useful given my present inexperience.

Thanks again,

Lior

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Choosing an ADC free of external clock signals