The AD1940/AD1941 is a 16-channel 28-bit audio processor that supports up to 192 kHz sample rates. It features a 28-bit × 28-bit multiplier, fully programmable program RAM, and parameter RAM that allows complete control of 1,024 parameters. The device also supports a double precision mode for full 56-bit processing and a PLL for generating MCLK from 64 × fS, 256 × fS, 384 × fS, or 512 × fS clocks.
The AD1940 and AD1941 are 28‑bit, single‑chip, multichannel SigmaDSP audio processors offering up to 16 channels of digital audio, 56‑bit double‑precision processing, and flexible serial interfaces. The document provides a functional block diagram, detailed specifications, digital timing tables, and pin‑out descriptions for both parts.
Key sections include electrical specifications, PLL and regulator performance, absolute maximum ratings, timing diagrams for the SPI and PC ports, and an ordering guide with package options. The handbook also outlines recommended programming procedures and application examples such as automotive sound systems and home‑theater equipment.
| Supply Voltage (VDD) | 2.25 V – 2.75 V |
|---|---|
| PLL Voltage (PLL_VDD) | 2.5 V (typ) |
| Output Voltage (ODVDD) | 5.0 V |
| Ambient Temperature Range (function guaranteed) | -40 °C to +105 °C |
| Digital Current (typical) | 155 mA |
| PLL Lock Time | 3 ms – 20 ms |
| Package | 48‑lead LQFP (ST‑48) |
The device operates from 2.25 V to 2.75 V supply voltage.
The PLL can generate MCLK from 64×fs, 256×fs, 384×fs, or 512×fs.
Functionality is guaranteed from –40 °C to +105 °C ambient temperature.
The AD1940 is offered in a 48‑lead low‑profile QFP (ST‑48) package.