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Introduction
Delta−Sigma
Modulator
Audio
Serial
Port
Clock
Control
V
IN
R+
V
IN
R
−
LRCK
or DSDBCK
BCK
or DSDL
DATA
or DSDR
CLIPR
CLIPL
Decimation
Filter
Voltage
Reference
NDR
V
REF
R
COM
R
V
COM
L
Voltage
Reference
V
REF
L
GNDL
Delta−Sigma
Modulator
V
IN
L
−
V
IN
L+
Power
V
CC
AGND
V
DD
DGND
HPF
Decimation
Filter
HPF
Reset
Logic
S/M
FMT0
FMT1
HPFD
FS0
FS1
FS2
SCKI
RST
Introduction
The PCM4202 is a high-performance, two-channel stereo audio analog-to-digital (A/D) converter
designed for use in professional and broadcast audio applications. The PCM4202 features
simultaneous 24-bit linear PCM or 1-bit Direct Stream Digital (DSD) data output for both channels.
Sampling rates up to 216kHz are supported for PCM output formats, while 64x or 128x
oversampled 1-bit data is supported for the DSD output mode. Native support for both PCM and
DSD data formats makes the PCM4202 ideal for use in a variety of audio recording and processing
applications.
The PCM4202 features 1-bit delta-sigma (
∆Σ
) modulators employing a novel density modulated
dithering scheme, yielding improved dynamic performance. Differential voltage inputs are utilized
for the modulators, providing excellent common-mode rejection. On-chip voltage references are
provided for the modulators, in addition to generating DC common-mode bias voltage outputs for
use with external input circuitry. Linear phase digital decimation filtering is provided for the 24-bit
PCM output, with a minimum stop band attenuation of -100dB for all sampling modes.
The PCM output mode features clipping flag outputs for each channel, as well as a digital high-pass
filter for DC removal. The PCM4202 is configured using dedicated input pins for sampling mode
and audio data format selection, high-pass filter enable/disable, and reset/power-down operation.
A +5V power supply is required for the analog section of the device, while a +3.3V power supply is
required for the digital circuitry.
Figure 1
shows the functional block diagram of the PCM4202.
Figure 1. PCM4202 Functional Block Diagram
PCM4202EVM User's Guide
SBAU103 – August 2004
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