D2-926XX Datasheet, PDF (23/37 Pages) Intersil Corporation – Integrated DSP Digital Sound Processing

D2-926xx
Functional Description
Introduction
The DAE-3 family of ICs provide the core functionality, amplifier
control, and complete audio signal processing for D2Audio
Class-D amplifier solutions. The devices are highly
programmable with all system features and functionality totally
defined by firmware, that includes complete definition of audio
processing, signal flow, digital audio I/O, and amplifier hardware
interface control.
The Audio Canvas III software design tool supports building of the
firmware for the DAE-3 family devices. Using Audio Canvas III, the
designer is able to fully define audio processing and hardware
function features with I/O assignments, and build complete
production-ready firmware for the DAE-3 devices.
DAE-3 DEVICE DESIGNATIONS
The DAE-3 device family includes both the DAE-3 and DAE-3HT
ICs. Functional specifications are identical to both designations
of this family unless otherwise indicated.
The family device names apply to these part numbers:
DAE FAMILY
DEVICE NAME
DAE-3
DAE-3HT
DAE PART
NUMBERS
D2-92633-LR
D2-92634-LR
D2-92683-QR
D2-92684-QR
PACKAGE
PINS
128-Pin Package
72-Pin Package
The DAE-3 devices are completely pin-compatible with the DAE-6
devices, allowing full flexibility for function vs cost trade-off,
providing cost-effective solutions for applications of varying
end-user features and capabilities.
The DAE-3HT devices are identical to the DAE-3 but are provided
in a smaller 72-pin package with features and I/O mapped to
pins supported in that package.
AUDIO CANVAS III SUPPORT
Audio Canvas III is a powerful design tool that lets the designer
define audio processing and build a signal flow customized to the
user’s specifications. It fully supports the DAE-3 family including
configuring the DAE family hardware I/O features and pin
assignments. The designer can define the entire audio signal
flow and architecture without signal flow limitations to any
specific system. Capabilities include drag-and-drop of individual
audio processing blocks that can be inserted into the signal flow,
ability to connect and re-route signal flow, and live update
capability to build and download the new audio architecture
directly into the operating amplifier.
The DAE-3 family of ICs supports a wide variety of signal flows
and audio processing options that are fully programmable and
are completely defined by the system firmware and system
architecture.
The firmware is built by the Audio Canvas III software, enabling
full audio processing and amplifier hardware feature definition
by the designer.
The DAE-3 supports a Class-D amplifier system built around
internal audio processing blocks and amplifier system hardware
functions.
In addition to audio processing blocks and signal flow that are
user-selectable, system functions of hardware are configurable
that include PWM timing control, channel configuration and
assignment, protection and monitoring features, clock
configurations, and other audio system features. Choices and
settings are defined using the Audio Canvas III design tool
software which builds the unique DAE firmware for each
particular system design.
DSP
The majority of the audio processing functions and hardware
feature implementations operate through firmware running
within the DSP core. The core is a 24-bit fixed-point Digital Signal
Processor, with its own DMA, interrupt control, memory spaces,
and control interfaces.
Sample Rate Converters (SRC)
DAE-3 family supports internal asynchronous sample rate
conversion to align input audio streams to a single rate
compatible with the DSP processing rate and PWM switch rate.
The family has 4 independent rate estimators, allowing up to 4
asynchronous stereo inputs (8 channels) to be sample rate
converted and processed simultaneously. The sample rate
converter has a measured SNR that exceeds 140dB and a
THD+N that exceeds -125dB.
Serial Digital Audio Interface
SERIAL DIGITAL AUDIO INPUTS
The DAE-3 families include 4 Serial Audio Interface (SAI) digital
audio input ports supporting up to 8 audio channels.
• The DAE-3 supports four independent SAI ports. All 4 ports
operate asynchronously to receive audio from 4 independent
audio sources, and each of the 4 ports has its own clock and
frame inputs. SAI Port 3 (the 4th port) of the DAE-3 has
multiplexed inputs to select that port’s audio from the SAI
input or from the on-chip ADC.
• The DAE-3HT devices support either 4 SAI input ports, or when
its fourth port is used as an audio output, support 3 SAI input
ports.
Each SAI port supports the digital audio industry I²S standard
which is capable of carrying up to 24-bit Linear PCM audio words
per subframe IEC60958, or compressed digital audio (Dolby®
Digital, AAC, MPEG, etc.) packing per the IEC61937 specification.
The SAI port also supports Left-Justified formatted Linear PCM or
compressed digital audio. These ports support sample rates from
32kHz to 192kHz.
SAI data formats are shown in Figure 6 on page 24. For I2S
format, the left channel data is read when LRCK is low. For the
Left-Justified format, the left channel data is read when LRCK is
high. Either format requires data to be valid on the rising edge of
SCLK and sent MSB-first on SDIN with 32 bits of data per
channel. Each set of digital inputs runs asynchronously to the
others and may accept different sample rates and formats.
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May 17, 2016