Infrared Transceiver. HSDL1100 Datasheet

HSDL1100 Transceiver. Datasheet pdf. Equivalent

Part HSDL1100
Description General Application Guide for the HSDL-1100 4 Mb/s Infrared Transceiver
Feature General Application Guide for the HSDL-1100 4 Mb/s Infrared Transceiver Application Note 1112 HSDL-.
Manufacture Agilent(Hewlett-Packard)
Datasheet
Download HSDL1100 Datasheet

General Application Guide for the HSDL-1100 4 Mb/s Infrared HSDL1100 Datasheet
Recommendation Recommendation Datasheet HSDL1100 Datasheet





HSDL1100
General Application Guide for
the HSDL-1100 4 Mb/s Infrared
Transceiver
Application Note 1112
HSDL-1100 Performance
Capability
Designed to Meet the IrDA Physical
Layer Specification version 1.1
• Performance is guaranteed at
the 1.152 Mb/s and 4.0 Mb/s
data rates. The HSDL-1100 is
also backward compatible to
2.4-115.2 kb/s data rates as
required by the IrDA specifica-
tion.
• Errorless 4 Mb/s performance
at link distances of 1.3-1.95
meters has been verified using
the HSDL-1100 and I/O chips
such as the National Semicon-
ductor PC87108, the VLSI
VL82C147, and the SMC
FDC37C957.
• Nose-to-Nose (0-5 cm) error-
less performance has also been
verified for an Ir link using the
HSDL-1100 and I/O chips.
• Sharp ASK/DASK errorless
performance on the Rxd-B
channel has been verified at
38.4 kb/s using the National
Semiconductor PC87108. Link
distance exceeded 2 meters
for typical HSDL-1100 units.
• As with the HSDL-1000, the
one-piece package of the
HSDL-1100 allows the Ir
system designer to easily meet
all IrDA viewing angle
specifications.
• Switching between IrDA data
rates is effortless as data is
always present at one of two
receiver outputs RxdA and
RxdB. Rxd-A provides 2.4-
115.2 kb/s data, and Rxd-B
provides 0.5-4 Mb/s data.
Capable of Receiving and Trans-
mitting Sharp ASK/DASK and TV
Remote
VCC
• The Rxd-B receiver channel
has been verified to correctly
receive Sharp ASK/DASK
500 kHz carrier for data rates
of 9.6 kb/s, 19.2 kb/s, and
38.4 kb/s. The National
Semiconductor PC87108 has
ASK/DASK capability on both
receive pins IRRX1 and IRRX2.
• The Rxd-A receiver channel is
proven capable of receiving
CX7
RLED
CX2
TXD
R1 7
10
HSDL-1100
VCC
CX6
PIN
BIAS
VREF
R3
4 VCC
CX5
CX1
GND
2
THRESHOLD
AND
SQUELCH
1 GND
63
CX4
9
CX3
Figure 1. HSDL-1100 Application Diagram.
RXD-A
8
RXD-B
5



HSDL1100
2
TV Remote signals correctly.
However, the sensitivity will
allow only 2-3 meters of
transmit to receive distance
unless the transmit power of
the remote signal is
>100 mW/sr.
• The HSDL-1100 transmitter is
capable of correct Sharp ASK/
DASK and TV Remote data
transmission at IrDA levels for
transmitted intensity (mW/sr).
HSDL-1100 Functional
Description
Transmitter
The transmitter uses a high speed,
high efficiency TS AlGaAs LED to
produce an Ir signal of intensity
and speed required by IrDA. The
LED drive transistor is Schottky
clamped to aid in meeting the IrDA
optical rise time, and pulse width
specifications. The external
components CX2 and R1 are
recommended to obtain current
peaking, which creates faster
optical pulse edges. Fast optical
edges will help the link meet the
required IrDA power budget.
LED current is set by selection of
RLED. See the Transmitter Drive
Requirements section.
Receiver
The receiver consists of two
channels, Rxd-A (2.4-115.2 kb/s)
and Rxd-B (0.5-4 Mb/s). Both
channels use the same detector
and pre-amplifier stage. Both
channels use CX1, CX5, CX6, and
R3 to filter out power supply noise.
The Rxd-B channel uses an
adaptive threshold circuit to
minimize pulse width distortion
(PWD) over the IrDA required
dynamic range. The Rxd-B
channel also uses a squelch circuit
to eliminate noise bits on Rxd
when no Ir signal is present. The
adaptive threshold circuit makes
use of CX3 and CX4.
In general, 2.4-115.2 kb/s Ir signals
create output pulses on Rxd-A, and
0.5-4 Mb/s Ir signals create output
pulses on Rxd-B. However, Ir
signals in the 10 kHz - 1 MHz range
may appear on both Rxd-A and
Rxd-B, depending on the Ir signal
strength. The presense of signal at
both Rxd-A and Rxd-B should not
be a problem for any properly
designed I/O chip. The I/O chip
should be designed to look at only
one channel at a time, depending
upon which data mode has been
selected by the software.
Dynamic Range
The dynamic range required by
IrDA for a 1 meter link is 4 µW/cm2
500 mW/cm2 for 2.4-115.2 kb/s, and
10 µW/cm2-500 mW/cm2 for 0.5-4
Mb/s. The wide dynamic range
requires a special circuit which
adjusts to the signal level for
comparison to a threshold. The
adaptive threshold circuit quickly
adjusts to the incoming signal level
and eliminates the need for any
external AGC circuitry or adjust-
ment.
Power Supply Noise Immunity
The HSDL-1100 receiver circuitry is
specially designed for power
supply noise immunity. The result
of the receiver design is improved
power supply noise immunity over
that of the HSDL-1000. Table 1
describes the HSDL-1100 noise
immunity as compared to that of
the HSDL-1000.
Power Supply Noise immunity is
the maximum amount of ripple or
noise on VCC that the receiver can
tolerate without generating any bit
errors. Noise levels above the noise
immunity will effectively reduce
the receiver sensitivity and there-
fore the Ir link distance. Without
any infrared signal present, noise
levels above the noise immunity
could generate pulses on RxdA or
RxdB. The worst case immunity is
defined as the lowest level of noise
immunity in any frequency range.
Ambient Light
The HSDL-1100 receiver design
allows for the ambient light levels
of sunlight, flourescent light, and
incandescent light specified in the
IrDA Physical Layer Specification.
As with the HSDL-1000, several
technologies are used in the HSDL-
1100 design to reduce the effects of
interfering ambient light. The
package mold compound is tinted
with dye to filter out light wave-
lengths below the Ir wavelengths of
850-900 nm. The lens of the detec-
tor is designed to focus light within
the IrDA viewing angle. The pre-
Table 1.
Worst Case Immunity
Power Supply Noise Immunity with no external
VCC filter or decoupling
Power Supply Noise Immunity with
recommended VCC filter including Cx5, R3, Cx6
HSDL-1000
Rxd
20 mV
HSDL-1100
Rxd-A
Rxd-B
90 mV
70 mV
> 1 volt pk-pk
> 1 volt pk-pk





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