Input filters

Question

Hello, 
 
 I use the AD9653-125EBZ and the HSC-ADC-EVALCZ evaluation boards. 
 The goal for me is to get random signal between 50Hz and 10MHz but the input filter on the AD9653-125EBZ doesn't allow me to get down to 500KHz. 
 I found the schematic for AD9253 board but it is not fully corresponding, some components are missing. 
 I tried to by-pass the filter on the board but with this change, I can not get signal anymore. 
 
 I have somes questions: 
 - How can I could get a signal between 50Hz -10MHz with the evaluation board? 
 - Could you provide the schematic for AD9653-125EBZ?

JAlipio · Accepted Answer

Hi GregINRS 
 Thanks for using AD9653. 
 The AD9653-125EBZ evaluation board features a default analog front-end configuration that includes a differential double balun (ETC1-1-13) and AC-coupling capacitors. This setup is optimized for high-frequency signals above approximately 4.5 MHz. 
 To acquire lower-frequency signals (down to 50 Hz), you'll need to modify the analog front-end by bypassing both the balun and the AC-coupling capacitors. One option is to use the alternate signal path that incorporates the ADA4930 differential amplifier. For reference, see Designing High Speed Analog Signal Chains From DC-to-Wideband | Analog Devices , ADA4930-1/ADA4930-2 (Rev. D) - HIGH PERFORMANCE ADC DRIVING, & AN-2539: Single-Supply, DC-Coupled 16-Bit, 125 MSPS Analog Front End for Bipolar Input Signals | Analog Devices 
 Note: The AD9253 and AD9653 share the same schematic and evaluation board layout, so the guidance applies to both.)

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Input filters