Fixed-point DSP with 26 MHz clock and 10 kB RAM
The ADSP-2171BST-104 is a 16-bit fixed-point digital signal processor from Analog Devices, clocked at 26 MHz with 10 kB of on-chip RAM — the working memory for your algorithm and buffers sits entirely on-die, so the external memory interface is only needed for program storage and bulk data. Core and I/O both run at 5.00 V, which simplifies the power rail design — a single 5 V supply feeds the DSP without a separate core regulator.
Package and board-fit for the 128-LQFP
Housed in a 128-lead LQFP (supplier device package 128-TQFP, 14x20 mm body), the 0.50 mm pitch demands a PCB with at least four layers for fan-out — the inner rows of pins route on buried layers, not on the outer two. Surface-mount package with no exposed thermal pad; the junction-to-ambient thermal path relies on the leadframe and the board copper. A solid ground plane under the package and vias under the body help pull heat into the inner layers.
Active lifecycle and compliance note
RoHS compliance is not claimed for this variant (RoHS non-compliant per the listing), so verify your assembly line's exemption allowance or plan for a leaded-solder profile if the rest of the BOM is RoHS.