CS8420
Digital Audio Sample Rate Converter
Features
General Description
The CS8420 is a stereo digital audio sample rate con-
verter (SRC) with AES3-type and serial digital audio
inputs, AES3-type and serial digital audio outputs, and
includes comprehensive control ability via a 4-wire mi-
crocontroller port. Channel status and user data can be
Complete IEC60958, AES3, S/PDIF, EIAJ
CP1201-compatible Transceiver with
Asynchronous Sample Rate Converter
Flexible 3-wire Serial Digital I/O Ports
8-kHz to 108-kHz Sample Rate Range
assembled
in
block-sized
buffers,
making
read/modify/write cycles easy.
Digital audio inputs and outputs may be 24, 20, or 16
bits. The input data can be completely asynchronous to
the output data, with the output data being synchronous
to an external system clock.
1:3 and 3:1 Maximum Input to Output Sample
Rate Ratio
128 dB Dynamic Range
The CS8420 is available in a 28-pin SOIC package in
both Commercial (-10º to +70º C) and Automotive
grades (-40º to +85º C). The CDB8420 Customer Dem-
onstration board is also available for device evaluation
and implementation suggestions.
-117 dB THD+N at 1 kHz
Excellent Performance at Almost a 1:1 Ratio
Excellent Clock Jitter Rejection
24-bit I/O Words
Please refer to “Ordering Information” on page 93 for or-
dering information.
Target applications include CD-R, DAT, MD, DVD and
VTR equipment, mixing consoles, digital audio trans-
mission equipment, high-quality D/A and A/D
converters, effects processors, and computer audio
systems.
Pin and Microcontroller Read/Write Access to
Channel Status and User Data
Microcontroller and Stand-Alone Modes
VA+ AGND FILT
RERR RMCK
VD+ DGND
ILRCK
ISCLK
SDIN
OLRCK
OSCLK
SDOUT
Serial
Audio
Input
Sample
Rate
Converter
Serial
Audio
Output
RXP
RXN
TXP
TXN
Clock &
Data
Recovery Decoder
AES3
S/PDIF
C & U bit
Data
Buffer
AES3
S/PDIF
Encoder
Receiver
Driver
Control
Port &
Registers
Output
Clock
Generator
Misc.
Control
H/S RST
EMPH U TCBL SDA/
SCL/ AD1/ AD0/ INT
OMCK
CDOUT CCLK CDIN CS
Copyright © Cirrus Logic, Inc. 2007
APRIL '07
DS245F4
(All Rights Reserved)
http://www.cirrus.com