ASDL-3023-021 Avago Technologies US Inc., ASDL-3023-021 Datasheet - Page 19

• Manufacturer Part Number: ASDL-3023-021
• Description: Infrared Transceivers SFF FIR+RC Front w/o Shield
• Manufacturer: Avago Technologies US Inc.

Specifications of ASDL-3023-021

• Wavelength: 885 nm, 875 nm
• Continual Data Transmission: 4 Mbit/s
• Transmission Distance: 30 cm
• Radiant Intensity: 50 mW/sr
• Half Intensity Angle Degrees: 15 deg
• Pulse Width: 4 us, 1.6 us
• Maximum Rise Time: 60 ns, 600 ns
• Maximum Fall Time: 60 ns, 600 ns
• Led Supply Voltage: - 0.3 V to 6 V
• Operating Voltage: 2.4 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 7.5 mm x 2.75 mm x 1.75 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Appendix C: General Application Guide for the ASDL-3023 infrared IrDA Compliant 4 Mb/s Transceiver.
Description
The ASDL-3023, a wide-voltage operating range infrared
transceiver is a low-cost and small form factor device
that is designed to address the mobile computing
market such as PDAs, as well as small embedded mobile
products such as digital cameras and cellular phones. It is
spectrally suited to universal remote control transmission
function at 940 nm typically. It is fully compliant to IrDA
1.4 low power specification
up 4Mb/s and support most remote control codes The
design of ASDL-3023 also includes the following unique
features :
• Spectrally
• Low passive component count;
• Shutdown mode for low power consumption
• Direct interface with I/O logic circuit.
Selection of Resistor R2
Resistor R2 should be selected to provide the appropriate
peak pulse IR and RC LED current respectively at different
ranges of Vcc as shown on page 3 under “Recommended
Application circuit components”.
Figure 2. Mobile Application Platform
9
Memory Expansion
transmission function at 940nm typically;
requirement;
SDRAM
suited
FLASH
ROM
Logic Bus Driver
to
Touch Panel
universal
remote
STN/TFT LCD Panel
Memory I/F
A/D
LCD Control
Power Management
control
Mobile Application
chipset
Interface to the Recommended I/O chip
The ASDL-3023’s TXD data input is buffered to allow
for CMOS drive levels. No peaking circuit or capacitor is
required. Data rate from 9.6kb/s to 4Mb/s is available at
RXD pin. The TXD_RC, pin6 together with LEDA, pin1 is
used to selected the remote control transmit mode. Al-
ternatively, the TXD_IR, pin2 together with LEDA, pin1 is
used for infrared transmit selection.
Following shows the hardware reference design with
ASDL-3023
*Detail configuration of ASDL-3023 with the controller
chip is shown in Figure 3.
The use of the infrared techniques for data communica-
tion has increase rapidly lately and almost all mobile ap-
plication processors have built in the IR port. This does
away with the external Endec and simplifies the interfac-
ing to a direct connection between the processor and the
transceiver. The next section discusses interfacing config-
uration with a general processor.
Peripherial
interface PWM
controller
Baseband
Key Pad
Antenna
interface
sound
IrDA
AC97
I2S
LCD Backlight Contrast
*ASDL-3023
PCM Sound
Audio Input