SigmaDSP Multichannel 28-Bit Audio Processor AD1940/AD1941 is a 16-channel digital audio processor produced by Analog Devices, supporting sample rates up to 192kHz, with a 28-bit×28-bit multiplier and a 56-bit accumulator. It supports custom program download, complete control of 1024 parameters, and safe load on the control port, which can transparently update parameters and completely control modes and memory transfers.
The AD1940 and AD1941 are 28‑bit SigmaDSP audio processors offering up to 16‑channel digital audio, programmable RAM, and a flexible serial data interface. The document provides detailed specifications, electrical characteristics, and functional block diagrams for system integration.
Key sections include specifications, digital I/O and timing, PLL and regulator details, absolute maximum ratings, and package dimensions. The manual also contains timing diagrams for the SPI and PC ports and an ordering guide for the 48‑lead LQFP package.
| Supply Voltage (VDD) | 2.25 V to 2.75 V |
|---|---|
| PLL Voltage (PLL_VDD) | 2.25 V |
| Output Voltage (ODVDD) | 5.0 V |
| Ambient Temperature Range (case) | -40 °C to +125 °C |
| Lock Time (PLL) | 3 ms to 20 ms |
| VSENSE Output Voltage | 2.25 V to 2.68 V |
| Maximum Digital Current (typical) | 155 mA |
The device operates from 2.25 V to 2.75 V supply voltage.
The PLL lock time is specified as 3 ms to 20 ms.
Functionality is guaranteed from –40 °C to +105 °C ambient and –40 °C to +125 °C case.
In TDM mode the device can handle 8 or 16 channels of serial data for both input and output.