APPLICATIONS INFOR
參數(shù)資料
型號(hào): LT1328CMS8#TR
廠商: Linear Technology
文件頁(yè)數(shù): 9/12頁(yè)
文件大?。?/td> 0K
描述: IC RECEIVER IR 4MBPS IRDA 8MSOP
標(biāo)準(zhǔn)包裝: 2,500
類型: 接收器
驅(qū)動(dòng)器/接收器數(shù): 0/1
規(guī)程: 紅外(IRDA)
電源電壓: 4.5 V ~ 5.5 V
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 帶卷 (TR)
6
LT1328
APPLICATIONS INFORMATION
WU
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.
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.
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
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
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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