LT1328CMS8#TRPBF Linear Technology, LT1328CMS8#TRPBF Datasheet - Page 6
![IC RECEIVER 4MBPS IRDA IR 8-MSOP](/photos/6/57/65743/8-msop_05-08-1660_sml.jpg)
LT1328CMS8#TRPBF
Manufacturer Part Number
LT1328CMS8#TRPBF
Description
IC RECEIVER 4MBPS IRDA IR 8-MSOP
Manufacturer
Linear Technology
Type
Receiverr
Datasheet
1.LT1328CS8PBF.pdf
(12 pages)
Specifications of LT1328CMS8#TRPBF
Number Of Drivers/receivers
0/1
Protocol
Infrared (IRDA)
Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
APPLICATIONS
LT1328
1.152Mbps rate, for example, uses pulses of 217ns for its
bit time of 870ns. Light levels are 100mW/SR to 500mW/
SR over the 1cm to 1 meter range. A photo of a transmit-
ted input and LT1328 output is shown in Figure 3. The
LT1328 output pulse width will be less than 800ns wide
over all of the above conditions at 1.152Mbps. Pin 7
should be held low for these data rates and above.
6
TRANSMITTER
TRANSMITTER
RECEIVER
RECEIVER
OUTPUT
OUTPUT
INPUT
INPUT
IrDA-FIR (1m)
IrDA-4ppm(1m)
DATA BIT
PAIR
00
01
10
11
U
4ppm DATA
SYMBOL
1000
0100
0010
0001
INFORMATION
U
DATA RATES: FIXED AT 4Mbps
BIT INTERVAL: 500ns
PULSE WIDTH: 1/4 OF INTERVAL OR 125ns
DATA RATES: FIXED AT 1.15Mbps
BIT INTERVAL: 870ns
PULSE WIDTH: 1/4 OF INTERVAL OR 217ns
0
0
W
1
1
0
0
Figure 3. IrDA-FIR Modulation
U
0
Figure 4. IrDA-4ppm
0
1
1
1
1
The last IrDA encoding method is for 4Mbps and uses
pulse position modulation, thus its name 4ppm. Two bits
are encoded by the location of a 125ns wide pulse at one
of the four positions within a 500ns interval (2 bits •
1/500ns = 4Mbps). Range and input levels are the same as
for 1.152Mbps. Figure 4 shows the LT1328 reproduction
of this modulation.
TRANSMITTER
TRANSMITTER
RECEIVER
RECEIVER
0
0
OUTPUT
OUTPUT
INPUT
INPUT
1
1
IrDA-FIR (1cm)
IrDA-4ppm (1cm)
0
0
1328 F04a
1328 F03a
NRZ DATA
IrDA 4ppm HIGH = LIGHT TRANSMITTED
NRZ DATA
IrDA-FIR HIGH = LIGHT TRANSMITTED