LT1328CS8#TRPBF Linear Technology, LT1328CS8#TRPBF Datasheet - Page 8

• Manufacturer Part Number: LT1328CS8#TRPBF
• Description: IC RECEIVER 4MBPS IRDA IR 8-SOIC
• Manufacturer: Linear Technology
• Type: Receiverr

Specifications of LT1328CS8#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-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
LT1328
There is one drawback to the previous scheme. Lowering
the highpass frequency to 14Hz negates the normally
excellent ambient light rejection of the LT1328 to line-
operated light sources. By modulating the data in a very
simple and inexpensive way the ambient light rejection
can be maintained. The NRZ data is used to gate a 3MHz
square wave before driving the transmitter. The LT1328 in
FIR-4ppm mode (bandwidth of 1MHz to 4MHz) will re-
ceive the 3MHz signal. Thus, the low frequency response
is no longer required and the LT1328 can be configured as
TYPICAL APPLICATIONS
8
MASTER FLASH
LIGHT FROM
3
74LS00
R2
10k
C5
4.7 F
100
R1
U
3MHz
2
1
375bps NRZ DATA
INFORMATION
HAMAMATSU
5V
U
Figure 6. Simple Data Link with Improved Low Frequency Noise Rejection
Q3
2N7002
R3
3.9
1/2W
S4797-01
D2
HSDL 4220
D1
330pF
U
TRANSMITTER/RECEIVER
W
C4
BIT ERROR RATE
OUT
100
N
R1
Wireless Slave for Photographic Flash
NC
1
2
3
4
> 30"
IN
U
LT1328
5
BPV22NF
6
74LS123
8
7
6
5
TEMIC
100pF
C8
1/2
1N4148
a FIR receiver with no changes. Note that when in FIR/
4ppm mode, the LT1328 has excellent rejection to active-
ballast fluorescent lights (40kHz to 100kHz) as well as line
operated bulbs. The data is recovered with two stages of
retriggerable one-shots on the output of the LT1328. The
first one-shot pulse length is set to 80ns and acts as an
edge detector and the second one-shot pulse length is set
to 2.3 s, just under a symbol period. With this modula-
tion, the range can be extended to over 30" and still have
a bit error rate lower than 1 in 10
NC
NC
D1
D2
7
11
10
9
R2
1k
46.4k
1%
R5
R3
10k
C4
100pF
5V
NC
5V
Q1
MPS2907A
1%
R4
5k
R4
10k
1
2
3
4
13
15
LT1328
74LS123
10pF
MPSA42
C7
1/2
OF SLAVE FLASH
TO HOT SHOE
C2
4.7 F
Q2
14
1
2
3
8
7
6
5
8
1328 F06
.
R5
1k
1328 TA05
C6
1000pF
C2
4.7 F
D3
MUR
160524
C5
0.1 F
5V