AD1940/AD1941 is a multichannel 28-bit audio processor produced by Analog Devices. It supports up to 192kHz sampling rate, has a 28-bit×28-bit multiplier and a 56-bit accumulator, supports custom program download and complete control of 1024 parameters, supports click-free volume control and dynamic parameter updates, has a double precision mode and 56-bit processing capability, supports PLL to generate MCLK clock, and has an embedded hardware-accelerated DSP core. It has 21 kB (6144 words) of data storage and supports I2S-compatible left-justified and right-justified serial port modes. It supports 8-bit and 16-bit data widths.
The AD1940 and AD1941 are 28‑bit SigmaDSP audio processors that support up to 16‑channel digital audio with sample rates up to 192 kHz. They include a 56‑bit accumulator, programmable RAM, a flexible serial data port, and an on‑chip voltage regulator for 3.3 V or 5 V systems.
The device can be controlled via a 4‑wire SPI interface (AD1940) or a 2‑wire I²C interface (AD1941). It offers multiple clocking options, TDM modes, and a built‑in PLL that generates the master clock for the DSP core. The datasheet provides detailed pin descriptions, timing diagrams, power‑up sequences, and recommended regulator designs.
| Supply Voltage (VDD) | 2.5 V |
|---|---|
| Input Voltage LO (V_IL) | 0.8 V |
| Maximum Junction Temperature | 135 °C |
| Package | 48‑lead LQFP |
The processors accept sample rates up to 192 kHz.
The AD1940 is controlled by a 4‑wire SPI port.
In TDM mode the device can input and output 8 or 16 channels of serial data.