Analog Devices ADuC7 series of ARM7 based analog microcontrollers has some unique features not offered by other manufacturers. Staying true to the name it offers great analog capabilities with precision analog I/O including 12 bit ADC and D/A in ADuC702x chips or 16 bit ADC in AduC703x with PGA (Programmable Gain Amplifier). But these chips also come with very unique peripherals like Programmable Logic Array (PLA), Direct Digital Synthesis (DDS) or ability to run directly off a high voltage of up to 16V for ADuC703x chips. In addition they come in some of the smallest packages for ARM based microcontrollers. 

ADuC7 web page click-here