Thanks for your quick reply. I connected Vcm of AD9253 to Vocm of ADA4938. So common mode voltage is set on 0.9 volts. The main problem is strong spurs in op amp output. Here is some information.
2. FFT of ADC samples (op…
By the way ... I've paid an attention to the caption of figure 47 ... " Figure 47. Differential Input Configuration Using the ADA4938-2 " While the OpAmp shown is ADA4930-2.
Is there any difference between the part numbers ADA4938-1ACPZ-R7 and ADA4938-1ACPZ-R2 other than the sample ordering quantity?
The actual output impedance of the ADA4938 is not directly stated in its datasheet. However, also like an op amp, the ADA4938 has a low output impedance.
For the proper termination of the output of the ADA4938 to drive a signal through…
I'm planning to use the AD9255 single 14 bit ADC with DC coupled input signals in the dc - 20 MHz range.
Because of the DC coupled requirement I am looking at ADC driver amplifiers instead of a transformer.
The AD9255 web page recommends the ADA4937…
AD8138可以作为 ADC driver，但是其-3dB带宽只有320MHz，所以最好采用ADA4938-2
My signal is IF signal at 10.7MHz, which can go -50dBm to 0 dBm.
I am thinking to use AD9650 instead of AD9265.
to convert single ended to differential i am planning to use ADA4938.
I will add 10dB gain by using ADA4938.
How much max gain ADA4938…