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PDF STA020D Data sheet ( Hoja de datos )

Número de pieza STA020D
Descripción 96kHz DIGITAL AUDIO INTERFACE TRANSMITTER
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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® STA020D
96kHz DIGITAL AUDIO INTERFACE TRANSMITTER
MONOLITHIC DIGITAL AUDIO INTERFACE
TRANSMITTER
3.3V SUPPLY VOLTAGE
SUPPORTS:
- AES/EBU, IEC 958,
- S/PDIF, & EIAJ CP-340
- Professional and Consumer Formats
PARITY BITS AND CRC CODES GENERATED
TRANSPARENT MODE ALLOWS DIRECT
CONNECTION OF STA020D AND STA120
DESCRIPTION
The STA020D is a monolithic CMOS device
which encodes and transmits audio data accord-
ing to the AES/EBU, IEC 958, S/PDIF, & EIAJ
CP-340 interface standards. It supports 96kHz
sample rate operation
The STA020D accepts audio and digital data
which is then multiplexed, encoded and driven
onto a cable.
The audio serial port is double buffered and ca-
BLOCK DIAGRAM
SO24
ORDERING NUMBER: STA020D
pable of supporting a wide variety of formats.
The STA020D multiplexes the channel, user, and
validity data directly from serial input pins with
dedicated input pins for the most important chan-
nel status bits.
SCK
FSYNC
SDATA
6
7
8
10
C
11
U
9
V
M0 M1 M2
23 22 21
VD+
19
GND
18
MCK
5
RST
16
AUDIO
SERIAL PORT
REGISTERS
MUX
7
DIFFERENTIAL
20
TXP
17
TXN
15 24
DEDICATED CHANNEL CBL TRNPT
STATUS BUS
D97AU599A
October 2002
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STA020D pdf
STA020D
GENERAL DESCRIPTION
The STA020D is a monolithic CMOS circuit that
encodes and transmits audio and digital data ac-
cording to the AES/EBU, IEC 958, S/PDIF, and
EIAJ CP-340 interface standards. The chip ac-
cepts audio and control data separately; multiplex
and biphase-mark encode the data internally and
drive it, directly or through a transformer, to a
transmission line.
The STA020D has dedicated pins for the most
important control bits and a serial input port for
the C, U and V bits.
Line Drivers
The differential line drivers for STA020D are low
skew, low impedance, differential outputs capable
of driving 110Ohm transmission lines. (RS422
line driver compatible).
They can also be disabled by resetting the device
(RST = low).
STA020D DESCRIPTION
The STA020D accepts 16 to 24-bit audio sam-
ples through a serial port configured in one of
seven formats; provides several pins dedicated to
particular channel status bits and allows all chan-
nel status, user and validity bits to be serially in-
put through port pins. This data is multiplexed,
the parity bit is generated and the bit stream is
biphase-mark encoded and driven through an
RS422 line driver.
The STA020D operates as a professional or con-
sumer interface transmitter selectable by pin 2,
PRO. As a professional interface device, the
dedicated channel status input pins are defined
according to the professional standard, and the
CRC code (C.S. byte 23) can be internally gener-
ated.
As a consumer device, the dedicated channel
status input pins are defined according to the
consumer standard. A submode provided under
the consumer mode is compact disk, CD, mode.
When transmitting data from a compact disk, the
CD subcode port can accept CD subcode data,
extract channel status information from it, and
transmit it as user data.
The master clock , MCK, controls timing for the
entire chip and must be 128xFs. As an example,
if stereo data is input to the STA020D at 44.1kHz,
MCK input must be 128 times that or 5.6448MHz.
Audio Serial Port
The audio serial port is used to enter audio data
and consists of three pins: SCK, SDATA and
FSYNC, SCK clocks in SDATA, which is double
buffered, while FSYNC delineates the audio sam-
ples and may indicate the particular channel, left
or right. To support many different interfaces, M2,
M1 and M0 select one of seven different formats
for the serial port. The coding is shown in Table 3
while the formats are shown in Figure 3.
Format 0 and 1 are designed to interface with
Crystal ADCs. Format 2 communicates with Mo-
torola and TI DSPs. Format 3 is reserved. Format
4 is compatible with the I2S standard. Formats 5
and 6 make the STA020D look similar to existing
16- and 18-bit DACs and interpolation filters. For-
mat 7 is an MSB-last format and is conducive to
serial arithmetic. SCK and FSYNC are outputs in
Format 0 and inputs in all other formats. In For-
mat 2, the rising edge of FSYNC delineates sam-
ples and the falling edge must occur a minimum
of one bit period before or after the rising edge.
In all formats except 2, FSYNC contains left/right
information requiring both edges of FSYNC to de-
lineate samples. Formats 5 and 6 require a mini-
mum of 16- or 18-bit audio words respectively. In
all formats other than 5 and 6, the STA020D can
accept any word length from 16 to 24 bits by add-
ing leading zeros in format 7 and trailing zeros in
the other formats, or by restricting the number of
SCK periods between active edges of FSYNC to
the sample word length.
FSYNC must be derived from MCK, either
through a DSP using the same clock or using
counters. If SFYNC moves (jitters) with respect to
MCK by four MCK periods, the internal counters
and CBL may be reset.
Table 1. Audio Port Modes
M2 M1 M0
Format
0 0 0 0 - FSYNC & SCK Output
0 0 1 1 - Left/Right, 16-24 Bits
0 1 0 2 - Word Sync, 16-24 Bits
0 1 1 3 - Reserved
1 0 0 4 - Left/Right, I2S Compatible
1 0 1 5 - LSB Justified, 16 Bits
1 1 0 6 - LSB Justified, 18 Bits
1 1 1 7 - MSB Last, 16-24 Bits
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STA020D arduino
STA020D
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco -
Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.
http://www.st.com
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