AD1941YSTZRL

Overview

The AD1941YSTZRL is a multichannel audio SigmaDSP processor from Analog Devices, housed in a 48-lead LQFP package. It features a 28-bit DSP core with a 28-bit × 28-bit multiplier and a full 56-bit accumulator, operating in double-precision mode for high dynamic range performance. The device accepts sample rates up to 192 kHz and includes an on-chip voltage regulator compatible with 3.3 V or 5 V systems while the core operates at 2.5 V. It provides 16-channel digital audio processing capabilities with flexible serial data ports supporting I2S, left/right-justified, and TDM modes.

Feature Summary

• 16-channel digital audio processing with 28-bit arithmetic and 56-bit double-precision accumulation
• On-chip PLL generates internal master clocks from 64×, 256×, 384×, or 512× fs inputs
• Flexible serial interfaces supporting I2S, left-justified, right-justified, and 8/16-channel TDM modes
• Controlled via 2-wire I2C bus with safeload registers for click-free parameter updates

Applications

• Automotive sound systems
• Home theater systems (Dolby Digital/DTS postprocessors)
• Digital speaker crossovers
• In-seat sound systems for aircraft and motor coaches

Procurement Notes

Verify the specific ordering suffix YSTZRL against the manufacturer's current datasheet to confirm package type and tape-and-reel packaging details. Ensure compatibility with the 2-wire I2C control interface required for this variant, as opposed to the SPI interface used by the AD1940. Confirm supply voltage requirements for VSUPPLY (typically 3.3 V or 5 V) and core VDD (2.5 V).

Selection Notes

Select the AD1941 over the AD1940 when an I2C control interface is preferred over SPI. The device supports up to 16 channels of input/output in TDM mode or 8 stereo pairs in standard serial formats. Ensure the design accommodates the external PNP transistor required for the on-chip voltage regulator if using 3.3 V or 5 V supplies. Verify that the host system can provide the necessary master clock frequencies (64× to 512× fs).

Part Context

The AD1941 is part of the AD1940/AD1941 family of SigmaDSP processors. While functionally identical to the AD1940 regarding signal processing, memory, and I/O, it differs exclusively in its control port architecture. The AD1941 utilizes a 2-wire I2C bus for configuration and data transfer, whereas the AD1940 uses a 4-wire SPI interface. Both share the same pinout except for the control pins and are housed in 48-lead LQFP packages.

Replacement Considerations

The AD1940 is a functional substitute if the system design allows for modification from I2C to SPI control logic. No other direct substitutes are documented in the provided source material.