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參數(shù)資料
| 型號： | LT1328 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal D-Type Transparent Latches With 3-State Outputs 20-SOIC 0 to 70 |
| 中文描述： | 4Mbps的IrDA紅外接收器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 274K |
| 代理商： | LT1328 |
6
LT1328
APPLICATIO
S I
N
FOR
ATIO
U
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.
W
U
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
INPUT
RECEIVER
OUTPUT
RECEIVER
OUTPUT
TRANSMITTER
INPUT
IrDA-FIR (1m)
IrDA-FIR (1cm)
Figure 3. IrDA-FIR Modulation
RECEIVER
OUTPUT
TRANSMITTER
INPUT
IrDA-4ppm(1m)
IrDA-4ppm (1cm)
Figure 4. IrDA-4ppm
RECEIVER
OUTPUT
TRANSMITTER
INPUT
0
1
0
0
1
1
0
1
0
1328 F03a
NRZ DATA
IrDA-FIR HIGH = LIGHT TRANSMITTED
DATA RATES: FIXED AT 1.15Mbps
BIT INTERVAL: 870ns
PULSE WIDTH: 1/4 OF INTERVAL OR 217ns
0
1
0
0
1
1
0
1
0
1328 F04a
NRZ DATA
IrDA 4ppm HIGH = LIGHT TRANSMITTED
DATA RATES: FIXED AT 4Mbps
BIT INTERVAL: 500ns
PULSE WIDTH: 1/4 OF INTERVAL OR 125ns
DATA BIT
PAIR
00
01
10
11
4ppm DATA
SYMBOL
1000
0100
0010
0001
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