AD1941YSTZ-29

Overview

The AD1941YSTZ-29 is a 16-channel digital audio processor from Analog Devices, part of the SigmaDSP family. It features a 28-bit × 28-bit multiplier with a full 56-bit accumulator for double-precision processing. The device accepts sample rates up to 192 kHz and includes 21 kB of data memory for audio delay. It operates on a single 2.5 V supply, utilizing an on-chip voltage regulator for compatibility with 3.3 V or 5 V systems. The AD1941 is distinguished by its 2-wire I²C control interface, contrasting with the SPI interface of the AD1940. It is housed in a 48-lead LQFP package.

Feature Summary

• 16-channel digital audio processing with support for sample rates up to 192 kHz
• 28-bit × 28-bit multiplier with full 56-bit double-precision accumulator
• 2-wire I²C control port for parameter updates and memory transfer
• On-chip voltage regulator compatible with 3.3 V and 5 V systems

Applications

• Automotive sound systems
• Digital televisions
• Home theater systems (Dolby Digital/DTS postprocessor)
• Multichannel audio systems
• Digital speaker crossover

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm pinout and electrical specifications. The AD1941 variant utilizes an I²C interface, which differs from the SPI interface found on the AD1940. Ensure that the control logic in the host system supports the required I²C protocol and addressing schemes defined in the technical documentation.

Selection Notes

Select the AD1941 over the AD1940 when an I²C control interface is preferred or required by the system architecture. Both devices share identical signal processing capabilities, including the 56-bit DSP core and 16-channel I/O. Consider the available serial data formats, such as I²S, left-justified, right-justified, and TDM modes, to ensure compatibility with connected ADCs and DACs.

Part Context

The AD1941 is functionally identical to the AD1940 except for the control interface. While the AD1940 uses a 4-wire SPI port, the AD1941 employs a 2-wire I²C bus. This distinction affects the pin configuration, specifically replacing the SPI pins (CDATA, CCLK, CLATCH, COUT) with I²C pins (SDA, SCL) and adding an I²C filter enable pin. The core DSP engine, memory sizes, and audio performance remain unchanged between the two parts.

Replacement Considerations

The AD1940 is a direct functional substitute if the system design allows for adapting the control interface from I²C to SPI. Verify that the host microcontroller has the necessary SPI hardware resources available. Pin compatibility must be checked, as the control pins differ significantly between the two variants.