Line Card

AD1940

 2007-10-15

【Basic Info】

【Product Feature】

Features : 16-channel digital audio processor
: Accepts sample rates up to 192 kHz
: 28-bit x 28-bit multiplier with full 56-bit accumulator
: Fully-programmable program RAM for custom program download
: Parameter RAM allows complete control of 1024 parameters
: SPI control port features safeload for transparent parameter updates and complete mode and memory transfer control (AD1940)
: I2C control port features safeload for transparent parameter updates and complete mode and memory transfer control (AD1941)
: Target/slew RAM for click-free volume control and dynamic parameter updates
: Double precision mode for full 56-bit processing
: PLL for generating MCLK from 64 × fS, 256 × fS, 384 × fS, or 512 × fS clocks
: Hardware-accelerated DSP core
: 21 kB (6144 words) data memory for up to 128 ms of audio delay at fS = 48 kHz
: Flexible serial data port with I2S compatible, left-justified, and right-justified serial port modes
Instructions/Cycles : 1536
DAC DNR (dB) : n/a
DAC THD+N @ 1 kHz (-3dB) : n/a
Digital I/O Channels : 16/16
Analog I/O Channels : 0/0
Product Description : SigmaDSP Multichannel 28-/56-Bit Audio Processor w/ 4-Wire SPI ® control interface.

【Application】

Applications : Automotive sound systems
: Digital televisions
: Home theater systems (Dolby Digital/DTS postprocessor)
: Multichannel audio systems
: Mini-component stereos
: Multimedia audio
: Digital speaker crossover
: Musical instruments
: In-seat sound systems (aircraft/motor coaches)

【Overview】

Product Brief The AD1940/41 is a complete 28-bit, single-chip, multichannel audio DSP for equalization, multiband dynamics processing, delay compensation, speaker compensation, and image enhancement. These algorithms can be used to compensate for the real-world limitations of speakers, amplifiers, and listening environments, resulting in a dramatic improvement of perceived audio quality.
The signal processing used in the AD1940/41 is comparable to that found in high-end studio equipment. Most of the processing is done in full, 56-bit double-precision mode, resulting in very good low-level signal performance and the absence of limit cycles or idle tones. The dynamics processor uses a sophisticated, multiple-breakpoint algorithm often found in high end broadcast compressors.
The AD1940/41 is a fully-programmable DSP. Easy-to-use software allows the user to graphically configure a custom signal processing flow using blocks such as biquad filters, dynamics processors, and surround sound processors. An extensive control port allows click-free parameter updates, along with readback capability from any point in the algorithm flow.
The AD1940/41’s digital input and output ports allow a glueless connection to ADCs and DACs by multiple, 2-channel serial data streams or TDM data streams. When in TDM mode, the AD1940/41 can input 8 or 16 channels of serial data, and can output either 8 or 16 channels of serial data. The input and output port configurations can be individually set.
The AD1940 is controlled via a 4-wire SPI port. The AD1941 is controlled via a 2-wire I2C port.