There is an internal 100kΩ resistor for the pull-up. An external one is not needed.
MAX9720
Production
The MAX9720 stereo headphone amplifier combines Maxim's DirectDrive architecture and SmartSense, an automatic mono/stereo detection feature. Conventional...
Datasheet
MAX9720 on Analog.com
MAX9720A
Production
The MAX9720 stereo headphone amplifier combines Maxim's DirectDrive architecture and SmartSense, an automatic mono/stereo detection feature. Conventional...
Datasheet
MAX9720A on Analog.com
MAX97200
Production
The MAX97200 is a 45mW Class H headphone amplifier that runs from a single low 1.8V supply voltage and employs Maxim's second-generation DirectDrive®...
Datasheet
MAX97200 on Analog.com
MAX9720B
Production
The MAX9720 stereo headphone amplifier combines Maxim's DirectDrive architecture and SmartSense, an automatic mono/stereo detection feature. Conventional...
Datasheet
MAX9720B on Analog.com
There is an internal 100kΩ resistor for the pull-up. An external one is not needed.