AD9653
Recommended for New Designs
The AD9653 is a quad, 16-bit, 125 MSPS analog-to-digital converter
(ADC) with an on-chip sample-and-hold circuit
designed for low cost, low power, small...
Datasheet
AD9653 on Analog.com
Hi there, I used the double ballon design for the RF infront. By checking the ad9653 schematic, The ETC1-1-13 was used in the board. I found the RF input was connected to the Pin4 of ETC1-1-13. However, the Pin4 of ETC-1-13 was supposed to connect to ground. Is anything wrong in the schematic? or after these years the pins configuration of ETC1-1-13 has been changed. Thanks!
Hello,
Based on latest ETC1-1-13 schematic............the Dual balun schematic pin assignment should be updated as shown below.
If the application requirement requires bandwidth up to 200 MHz than the ADT1-1WT transformer should be sufficient and provide excellent amplitude and phase balance over this region.
One could also consider the TCM2-33WX+ "balun" which also shows excellent amplitude and phase balance over a wider frequency range.
I doubt the double balun design on the EVB using the ETC1-1-13 would result in any better performance/balance thus using a single transformer or balun would simplify design.
Regards
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Hello,
One may also want to replace baluns with more recently released ADC differential drivers considering that a balun or transformer must still be driven by a single-ended amplifier. The two dual amplifiers below would be strong candidates.
