Which model of AD641 are you using? the 20 ld plastic dip pkg is available for $36.31 in quantities of 100 - 499. (AD641ANZ)
The AD8317, AD8318, AD8319 might work. They have the dynamic range and video bandwith.
Take a look at the following parts on Analog.com:
The most versatile device (highest frequency range, highest…
I have an application for a "baseband" logarithmic amplifier from DC to 250 MHz to compress signals before digital conversion. I understand how the demodulating log amps work and devices such as the AD8310 won't work. However, the AD641 brings…