Lun,
Verify the clock is present at the ADC clk input pins and verify the amplitude meets the specification of the ADC. Is you board setup for serial or parallel SPI mode? If parallel, what position are the shunts on the following jumpers set to:
…
Mark:
This looks like harmonics; however, there is something strange. The LO is ~ 2GHz (1.8GHz). The BB is 200 MHz. There are some high spurs at ~500 MHz, ~1 GHz, and ~1.5 GHz that I do not understand. Further, I do not understand the difference between…
thanks for your valuable suggestions, i have to now dump OPA659 from my design because of poor response at 100MHz , what i ignored is the gain bandwidth product which is a very important parameter, i need to amplify a current atleast 50nA for which i…
Hi Richard,
Thanks for the answer.
Yes I want a DC coupled system. I did put zero ohm element in place of C1 and C4.
You are right, I did not installed R18, and 2.5V that I see is the midrange of the amp power supply.
I think that if I want…
ello Chris,
Here are some options to consider if this amplification needs to be done in a single stage. In the case of the THS4508 & 4509 there will be some starting from around 20MHz onwards.
Compare Parts.pdf
Best,
Hasan Babiker
Part Number: LMH6552 Other Parts Discussed in Thread: THS4511 , , THS4503 , THS4509
Hello
I want to build an high linearity data acquisition with a 14-Bit 65MSPS ADC .
the signal source is within 0.5Vpp and 10KHz to 10MHz with a 50 Ohm coxial cable…
SM,
The 69.8 ohm in parallel with the 100 ohm will present a 50 ohm impedance to the source. The direct math is going to show the parallel impedance is 41 ohms but remember when going from single-ended to differential the right hand side of the 100…
Other Parts Discussed in Thread: ADS52J90 , THS4509 , OPA2300 Hi all, My customer plans to use ADS52J90 for a photo sensor input application.
A signal path is as follows;
Photo sensors -> I/V conversion of a photo diode input (OPA2300) -> single to…
Hi,
the EVM for the ADS5560 has a transformer coupled input using a Coilcraft transformer that has a bandwidth to cover well down below 1MHz or up over 100MHz. I would take a look at that. The schematic for the EVM is presented in the back of the User…
