D2-45057_14 Datasheet, PDF (17/31 Pages) Intersil Corporation – Intelligent Digital Amplifier PWM Controller and Audio Processor

D2-45057, D2-45157
Functional Description
Overview
The D2-45057, D2-45157 device, shown in Figure 12, is
an integrated System-on-Chip (SoC) audio processor and
Class D digital audio amplifier. It includes digital audio
input selection, signal routing, complete audio
processing, PWM controllers, amplifier and protection
control, and integrated power stages. Stereo I²S and
S/PDIF Digital input support, plus I²C and 2-wire SPI
control interfaces provide integration compatibility with
existing system architectures and solutions.
The four configurable power stages can operate as four
separate Half-Bridge outputs, as two Full-Bridge outputs,
or in combinations of Half-Bridge plus Full-Bridge
outputs. Separate PWM outputs provide additional
combinations to drive headphone, or line-level stereo
and subwoofer outputs. These application-dependent
configurations provide for driving Stereo (2.0) Speaker,
2.1 Speaker, and Stereo (2.2) Bi-Amp Speaker solutions,
as well as providing Stereo Line outputs, Headphone
outputs, or Subwoofer line outputs.
Audio output implementations are defined by
configuration mode select pins, providing four
combinations of powered and line amplifier outputs as
shown in Table 1. The five independent audio processing
paths feed a PWM engine, where its five PWM channels
are mapped to the configuration-selected power stages
and line outputs.
TABLE 1. OUTPUT CONFIGURATION MODES
CONFIG
MODE NAME
FUNCTION
0
2.0 L/R • Powered Left and Right Outputs
4-Quadrant With 4-Quadrant, Full Bridge Drivers.
• No Line-Level Outputs
1
2.0 L/R • Powered Left and Right Outputs
+
With 2-Quadrant, Full Bridge Drivers.
L/R/Sub
Line
• Stereo Left + Right Line-Level
Outputs.
• Subwoofer Line-Level Output
2
2.1 • Two Half Bridge Drivers for Powered
L/R/Sub Left and Right Outputs.
+
L/R Line
• 2-Quadrant, Full Bridge Driver for
Powered Subwoofer Output.
• Two (Stereo Left + Right)
Line-Level Outputs.
• Crossover Filtering Included Within
Audio Path Signal Flow.
3
2.2 • Four Half Bridge Drivers for Powered
Bi-Amp Bi-Amp Left + Right Outputs.
• Crossover Filtering Included Within
Audio Path Signal Flow.
The audio path includes a stereo Sample Rate Converter
(SRC), five independent audio processing channels, plus
device-specific audio enhancement algorithms.
Programmable parameter settings for audio processing
include volume control, path routing and mixing,
high/low pass filtering, multi-band equalizers,
compressors, and loudness. These parameters can be
adjusted using the D2Audio™ Audio Canvas™ software,
or can be set by a system/amplifier microcontroller
through the D2-45057, D2-45157 device’s control
interface.
Audio Enhancement Features
The D2-45057, D2-45157 devices include the D2Audio
SoundSuite™ or SRS WOW/HD™ audio enhancement
algorithms. These device-specific functions are
integrated within the firmware as part of the standard
audio processing signal flow, and are supported per
device as:
• D2Audio SoundSuite™ (WideSound™, DeepBass™,
Audio Align™, and ClearVoice™) Audio Processing
- Included in the D2-45057 device
• SRS WOW/HD™
- Included in the D2-45157 device
Each of these enhancements utilizes its own algorithms,
where choice of enhancement is specified by device part
number. The D2-45057 includes only D2Audio
SoundSuite™ support, and the D2-45157 includes only
SRS WOW/HD™ support. These enhancements also
have their own unique set of programmable parameters
to control operation.
Serial Audio Digital Input
The D2-45057, D2-45157 devices include one Serial
Audio Interface (SAI) port accommodating two digital
audio input channels. This SAI port operates in slave
mode only, supports the I²S digital audio industry
standard, and can carry up to 24-bit Linear PCM audio
words.
The digital audio input from the SAI input port routes
directly through the Sample Rate Converters (SRC).
Either the I²S digital input, or the S/PDIF Digital input
may be selected as the audio path source.
S/PDIF Digital Audio I/O
The D2-45057, D2-45157 contains one IEC60958
compliant S/PDIF Digital receiver input and one
IEC60958 compatible S/PDIF Digital transmitter.
The S/PDIF Digital receiver input includes an input
transition detector, digital PLL clock recovery, and a
decoder to separate the audio data. The receiver meets
the jitter tolerance specified in IEC60958-4.
The S/PDIF Digital transmitter complies with the
consumer applications defined in IEC60958-3. The
transmitter supports 24-bit audio data, but does not
support user data and channel status.
17
FN6785.0
July 29, 2010