GENERAL DESCRIPTION
The ADSP-21991 is a mixed signal DSP controller based on the ADSP-219x DSP Core, suitable for a variety of high performance industrial motor control and signal processing applications that require the combination of a high performance DSP and the mixed signal integration of embedded control peripherals such as analog-to-digital conversion.

KEY FEATURES
   ADSP-219x, 16-Bit, Fixed Point DSP Core with up to
      160 MIPS Sustained Performance
   40K Words of On-Chip RAM, Configured as 32K Words
      On-Chip 24-Bit Program RAM and 8K Words On-Chip
      16-Bit Data RAM
   External Memory Interface
   Dedicated Memory DMA Controller for Data/Instruction
      Transfer between Internal/External Memory
   Programmable PLL and Flexible Clock Generation
      Circuitry Enables Full Speed Operation from Low
      Speed Input Clocks
   IEEE JTAG Standard 1149.1 Test Access Port Supports
      On-Chip Emulation and System Debugging
   8-Channel, 14-Bit Analog-to-Digital Converter System,
      with up to 20 MSPS Sampling Rate (at 160 MHz Core
      Clock Rate)
   Three Phase 16-Bit Center Based PWM Generation Unit
      with 12.5 ns Resolution at 160 MHz Core Clock (CCLK)
      Rate
   Dedicated 32-Bit Encoder Interface Unit with
      Companion Encoder Event Timer
   Dual 16-Bit Auxiliary PWM Outputs
   16 General-Purpose Flag I/O Pins
   Three Programmable 32-Bit Interval Timers
   SPI Communications Port with Master or Slave
      Operation
   Synchronous Serial Communications Port (SPORT)
      Capable of Software UART Emulation
   Integrated Watchdog Timer
   Dedicated Peripheral Interrupt Controller with Software
      Priority Control
   Multiple Boot Modes
   Precision 1.0 V Voltage Reference
   Integrated Power-On-Reset (POR) Generator
   Flexible Power Management with Selectable Power-Down and Idle Modes
   2.5 V Internal Operation with 3.3 V I/O
   Operating Temperature Range of –40ºC to +85ºC
   196-Ball Mini-BGA Package
   176-Lead LQFP Package

TARGET APPLICATIONS
   Industrial Motor Drives
   Uninterruptible Power Supplies
   Optical Networking Control
   Data Acquisition Systems
   Test and Measurement Systems
   Portable Instrumentation