There are so many around. And almost every is better than 741.
Look for RR I/O, specified with single 5V supply, GBW > 500kHz.
Look for "lockin amplifier".
For phase detect I recommend to generate a second 50% duty cycle signal but withexactely 90° phase shift.
(Easy with a PLD with twice the input frequency).
Use this signal as reference for a second lockin amplifier.
With the output signals of both lockin amplifiers you can calculate amplitude as well as phase shift.