Maxim offers better PSRR (80dB vs. 65dB for Analog Devices AD1992)
Wider operating voltage range (10V to 25V vs. 8V to 20V for AD1992)
Spread-Spectrum modulation for lower EMI
Differential audio inputs instead of single ended compared to the AD1992. Offered in a 7x7mm package vs. a 9x9mm package for the AD1992. The AD1992 requires 8 external clamp diodes.