Texas Instruments SRC4392EVM-PDK Evaluation Module SRC4392EVM-PDK SRC4392EVM-PDK Datenbogen
Produktcode
SRC4392EVM-PDK
(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
VDD33
0.1 F
m
To RX+
To RX-
All-Plastic
(5 or 10 meters maximum)
(1) Toshiba TORX141 or equivalent.
Optical
Receiver
(1)
SBFS029D – DECEMBER 2005 – REVISED DECEMBER 2012
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 SRC4392 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 SRC4392 VDD33 power source, as shown in
. For the +5V optical receivers, the output high
logic level may exceed the SRC4392 line receiver absolute maximum input voltage. A level translator is required,
placed between the optical receiver output and the SRC4392 line receiver input.
placed between the optical receiver output and the SRC4392 line receiver input.
shows the
recommended input circuit when interfacing a +5V optical receiver to the SRC4392 line receiver inputs. The
Texas Instruments SN74LVC1G125 single buffer IC is operated from the same +3.3V supply used for SRC4392
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 SRC4392
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
Copyright © 2005–2012, Texas Instruments Incorporated
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