Texas Instruments SRC4382 Evaluation Module (EVM) and USB motherboard SRC4382EVM-PDK SRC4382EVM-PDK 데이터 시트
제품 코드
SRC4382EVM-PDK
www.ti.com
VDD33
0.1 F
m
To RX+
To RX-
All-Plastic
(5 or 10 meters maximum)
(1) Toshiba TORX141 or equivalent.
Optical
Receiver
(1)
(1) Toshiba TORX173, TORX176, TORX179, or equivalent.
+5V
SN74LVC1G125
or Equivalent
0.1mF
T RX+
o
To RX-
All-Plastic
(5 or 10 meters maximum)
Optical
Receiver
(1)
VDD33
5
2
3
1
4
SBFS030C – JANUARY 2006 – REVISED SEPTEMBER 2007
Optical interfaces utilizing all-plastic fiber are commonly employed for consumer audio equipment where
interconnections are less than 10m in length. Optical receiver modules utilized for a digital audio interface
operate from either a single +3.3V or +5V supply and have a TTL-, CMOS-, or low-voltage CMOS-compatible
logic output. Interfacing to +3.3V optical receivers is straightforward when the optical receiver supply is powered
from the SRC4382 VDD33 power source, as shown in
interconnections are less than 10m in length. Optical receiver modules utilized for a digital audio interface
operate from either a single +3.3V or +5V supply and have a TTL-, CMOS-, or low-voltage CMOS-compatible
logic output. Interfacing to +3.3V optical receivers is straightforward when the optical receiver supply is powered
from the SRC4382 VDD33 power source, as shown in
. For the +5V optical receivers, the output high
logic level may exceed the SRC4382 line receiver absolute maximum input voltage. A level translator is required,
placed between the optical receiver output and the SRC4382 line receiver input.
placed between the optical receiver output and the SRC4382 line receiver input.
shows the
recommended input circuit when interfacing a +5V optical receiver to the SRC4382 line receiver inputs. The
Texas Instruments SN74LVC1G125 single buffer IC is operated from the same +3.3V supply used for SRC4382
VDD33 supply. This buffer includes a +5V tolerant digital input, and provides the logic level translation required
for the interface.
Texas Instruments SN74LVC1G125 single buffer IC is operated from the same +3.3V supply used for SRC4382
VDD33 supply. This buffer includes a +5V tolerant digital input, and provides the logic level translation required
for the interface.
Figure 85. Interfacing to a +3.3V Optical Receiver Module
Figure 86. Interfacing to a +5V Optical Receiver Module
44
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