HSDL-3021-021 Avago Technologies US Inc., HSDL-3021-021 Datasheet - Page 15

• Manufacturer Part Number: HSDL-3021-021
• Description: Infrared Transceivers FIR + RC
• Manufacturer: Avago Technologies US Inc.

Specifications of HSDL-3021-021

• Wavelength: 885 nm
• Continual Data Transmission: 4 Mbit/s
• Transmission Distance: 50 cm
• Radiant Intensity: 4 mW/sr
• Half Intensity Angle Degrees: 30 deg
• Pulse Width: 4 us, 1.6 us
• Maximum Rise Time: 40 ns, 600 ns
• Maximum Fall Time: 40 ns, 600 ns
• Led Supply Voltage: 0 V to 6.5 V
• Operating Voltage: 2.4 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 8 mm x 3 mm x 2.5 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15
Appendix B: PCB Layout Suggestion
The effects of EMI and power
supply noise can potentially
reduce the sensitivity of the
receiver, resulting in reduced
link distance. The PCB layout
played an important role to
obtain a good PSRR and EM
immunity resulting in good
electrical performance. Things to
note:
1. The ground plane should be
2. The shield trace is a wide,
3. VLED can be connected to
continuous under the part,
but should not extend under
the shield trace.
low inductance trace back to
the system ground. CX1, CX2,
CX3, CX4 and CX5 are
optional supply filter
capacitors; they may be left
out if a clean power supply is
used.
either unfiltered or
unregulated power supply.
The bypass capacitors should
be connection before the
current limiting resistor R2
respectively. In a noisy
environment, including
4. V
5. IOV
6. Preferably a multi-layered
capacitor CX3and CX4 can
enhance supply rejection.
CX3 that is generally a
ceramic capacitor of low
inductance providing a wide
frequency response while
CX4 is tantalum capacitor of
big volume and fast
frequency response. The use
of a tantalum capacitor is
more critical on the VLED
line, which carries a high
current.
either unfiltered or
unregulated power supply.
The Resistor, R1 together
with the capacitors, CX1 and
CX2 acts as the low pass
filter.
ASIC voltage supply or the
VCC supply. The capacitor,
CX5 acts as the bypass
capacitor.
board should be used to
provide sufficient ground
plane. Use the layer
underneath and near the
CC
CC
pin can be connected to
is connected to the
• Top Layer: Connect the
• Layer 2: Critical ground
• Layer 3: Keep data bus
• Bottom layer: Ground
transceiver module as Vcc,
and sandwich that layer
between ground connected
board layers. The diagram
below demonstrate an
example of a 4 layer board:
metal shield and module
ground pin to bottom
ground layer;
Place the bypass capacitors
within 0.5 cm from the V
and ground pin of the
module.
plane zone. 3 cm in all
directions around the
module. Connect to a
clean, noiseless ground
node (e.g., bottom layer).
away from critical ground
plane zone.
layer. Ground noise
<75 mVp-p. Should be
separated from ground
used by noisy sources.
CC