DDX
Multichannel
Digital Audio Processor
1.0 GENERAL DESCRIPTION
The DDX-4100A Digital Audio Processor is a single
chip device for implementing complete digital
solutions for audio amplification. In conjunction with
multiple DDX-2060 Power IC’s, the solution provides
a full digital, multi-channel, high quality, power
processing chain without the need of Digital-to-Analog
converters between the DSP and power amplifier.
The device supports two input configurations, AC’97
input mode or IIS/SPDIF input mode, with the
selection made via a dedicated pin (AC97_MODE
pin).
The AC’97 input mode can be configured to work in
either a ‘Fully Compliant’ mode or a ‘Proprietary’
mode. The selection of this compliance mode is made
in a Vendor Reserved register. The ‘Fully Compliant’
mode conforms to rev 2.1 of AC’97 specification. The
‘Proprietary’ mode enables additional features not
found in the ‘Fully Compliant’ mode. The link supports
up to 6 input channels with discrete sampling
frequencies of 44.1, 48, 88.2, or 96 kHz.
FEATURES
x SOURCE-TO-SPEAKER INTEGRATED
DIGITAL AUDIO SOLUTION w/DDX-2060
Power IC’s
x DIGITAL PREAMP FUNCTIONS:
x Digital Volume Control
x Bass and Treble
x Parametric EQ on each Channel
x Bass Management for LFE Channel
x Soft Mute
x Automatic mute for Zero Inputs
x 4+1 CHANNELS DDX PROCESSING
x STEREO S/PDIF INPUT INTERFACE
x 4 CHANNEL PROGRAMMABLE SERIAL
INPUT INTERFACE
x 6 CHANNEL PROGRAMMABLE SERIAL
OUTPUT INTERFACE
x Intel AC’97 LINK (rev.2.1) INPUT INTERFACE
for AUDIO AND CONTROL
x AUTOMATIC INPUT SAMPLING
FREQUENCY DETECTION AND SAMPLE
RATE CONVERTER
x I
2
C CONTROL BUS
x LOW POWER 3.3V CMOS TECHNOLOGY
x EXTERNAL INPUT CLOCK OR BUILT-IN
XTAL OSCILLATOR
x DIGITAL GAIN CONTROL; UP TO +24dB @
0.75dB/STEP
DDX-4100A BLOCK DIAGRAM
PWDN
SA SCL SDA
LEFT_A
LEFT_B
RIGHT_A
RIGHT_B
SLEFT_A
SLEFT_B
SRIGHT_A
SRIGHT_B
LFE_A
LFE_B
LRCK0
BICKO
SDO_2
15
DDX
I
2
S
PowerDown
DSP
RAM
ROM
SRC
I
2
C
PLL
AC’97
S/PDIF
I
2
S
DDX-4100A
DPR1001 harman/kardon
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