ADSP-21xx are 16-bit fixed-point DSP microprocessors with on-chip memory from Analog Devices. The series uses an enhanced Harvard architecture for three-bus performance: instruction bus and dual data buses. Independent computation units include arithmetic logic unit (ALU), multiplier/accumulator and shifter. Single-cycle instruction execution and multifunction instructions. On-chip program memory is RAM or ROM, data memory is RAM. Integrated serial ports, timer and host interface port (only for ADSP-2111).
The ADSP-21xx family consists of 16‑bit fixed‑point DSP microprocessors with on‑chip program and data memory, enhanced Harvard architecture, and a range of peripherals such as serial ports, timers, and, for the ADSP‑2111, a host interface port. The devices operate up to 25 MHz, delivering 25 MIPS with a 40 ns instruction cycle.
The datasheet includes detailed specifications, pin definitions, package options, timing parameters, and development‑tool information. It also describes interrupt handling, serial‑port capabilities, and the host interface port used for communication with external processors.
| Processor type | 16‑Bit Fixed‑Point DSP |
|---|---|
| Maximum instruction rate | 25 MIPS, 40 ns per instruction |
| Supply voltage | 5 V (or 3.3 V for some models) |
| Instruction cycle time | 40 ns at 25 MHz |
| On‑chip program memory (RAM) | 2 KB |
The ADSP‑21xx processors achieve up to 25 MIPS with a 40 ns instruction cycle.
The ADSP‑2111 model adds a 16‑bit host interface port.
ADSP‑21xx devices operate from 5 V, with some models (e.g., ADSP‑2103, ADSP‑2162) supporting 3.3 V.