Package BGA contains the embedded encoder.Total pin count on the rotary encoders is 100.Surface Mount mounts it on the wall.Encoders like this have 100 pins.The rotary encoder contains 2 A/D converters.The quadrature encoder includes 5 D/A converters.
TW9920-BC1-GR Features
In BGA package 100 pins 2 A/D Converters
TW9920-BC1-GR Applications
There are a lot of Intersil (Renesas Electronics America) TW9920-BC1-GR Encoders, Decoders, Converters applications.