STA020(2010) Ver la hoja de datos (PDF) - STMicroelectronics
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STA020 Datasheet PDF : 14 Pages
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Figure 2. STA020D Typical Connection Diagram.
EXTERNAL
CLOCK
+5V
STA020
AUDIO
DATA
PROCESSOR
FSYNC
7
SCK
6
SDATA
8
MCK
5
VD+
19
18
GND
0.1µF
V
M0
9
23
DECODER
SBF
10
M1
22
SERIAL PORT
SUBCODE
U
M2
MODE SELECT
PORT
11
SBC
21
STA020
15
) RESET
t(s CONTROL
uc CHANNEL
d STATUS BITS
ro CONTROL
RST 16
TXP
20
TXN
17
8 DEDICATED C.S. BITS
TRANSMITTER
CIRCUIT
D99AU989A
lete P GENERAL DESCRIPTION
o The STA020D is a monolithic CMOS circuit that encodes and transmits audio and digital data according
s to the AES/EBU, IEC 958, S/PDIF, and EIAJ CP-340 interface standards. The chip accepts audio and con-
b trol data separately; multiplex and biphase-mark encode the data internally and drive it, directly or through
O 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
t(s and V bits.
uc Line Drivers
rod The differential line drivers for STA020D are low skew, low impedance, differential outputs capable of driv-
ing 110Ohm transmission lines. (RS422 line driver compatible).
P They can also be disabled by resetting the device (RST = low).
olete STA020D DESCRIPTION
s The STA020D accepts 16 to 24-bit audio samples through a serial port configured in one of seven formats;
Obprovides several pins dedicated to particular channel status bits and allows all channel status, user and
validity bits to be serially input 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 consumer interface transmitter selectable by pin 2, PRO. As
a professional interface device, the dedicated channel status input pins are defined according to the pro-
fessional standard, and the CRC code (C.S. byte 23) can be internally generated.
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 in-
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