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ADRF5730 Recommended for New Designs
The ADRF5730 is a silicon, 6-bit digital attenuator with 31.5 dB attenuation control range in 0.5 dB steps. This device operates from 100 MHz to 40 GHz...
Datasheet
ADRF5730 on Analog.com

Table of Contents

How does placing a 1 kO resistor on the control line of ADRF5730 affect the switching time, and what are the implications for the power-up sequencing?

Placing a 1 kO resistor on the control line of ADRF5730 would introduce a delay of less than 5 ns on the digital pins, which should not affect the part's operational characteristics, given the 250 ns 0.1 dB settling time. If the power-up sequence is not followed, placing a 1 kO resistor is recommended to ensure that the digital pin current remains below 3 mA. Limiting the output current from the FPGA output pin to less than 3 mA can also help prevent damage to the chip.
Tags: Digital Step Attenuators attenuators ADRF5730