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參數(shù)資料
| 型號(hào)： | LT1328CS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RECEIVER 4MBPS IRDA IR 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 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-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
4
LT1328
GND (Pin 4): Ground.
DATA (Pin 5): TTL Output of the Comparator. A TTL LOW
at this pin indicates that the photodiode has received a
pulse of light. This pin will remain HIGH when the light
signal and noise are below the attenuation band of the DC
servo.
VCC (Pin 6): 5V Supply. A bypass capacitor, connected as
close as possible from Pin 6 to ground is recommended
(4.7
F).
MODE (Pin 7): A TTL HIGH on this pin will cause the open
collector at Pin 3 to switch to ground. This is an option that
switches in extra capacitance for lower frequency data
rates. If this pin is not used, select a capacitor (C4) to
accommodate the lowest data rate (for IrDA C4 = 10nF).
VBIAS (Pin 8): A 1000pF capacitor from this pin to ground
is required.
PIN FUNCTIONS
UU
U
IN (Pin 1): Connect this pin to the photodiode cathode.
This is the input to the preamplifier and is held at 1.5V by
the output of the DC servo. To maintain the 1.5V on this
pin, the DC servo can source up to 2mA or sink 40
Atothis
pin.
FILTER (Pin 2): Connect a capacitor from this pin to
ground. The value of the capacitor will set the band of
frequencies that will be attenuated by the servo. The pole
is set by the formula f = 25/(2
π 60k C). A 330pF
capacitor will attenuate photodiode signals below 200kHz
when operating at high data rates (FIR and 4ppm).
FILTER SWITCH (Pin 3): Collector of a Transistor Switch.
When the MODE switch (Pin 7) is TTL HIGH this pin will be
switched to ground. This pin is used to increase the filter
capacitor for slower data rates (SIR). A 10nF capacitor
from Pin 2 to Pin 3 will bring the highpass frequency down
to 6.6kHz for SIR.
BLOCK DIAGRAM
W
Figure 1. LT1328 Block Diagram
RFB
50k
1.5V
VCC
RIN
2k
D1
PHOTODIODE
TEMIC
BPV22NF
C1
10nF
IN
1
8
VBIAS
6
5V
VCC
7
MODE
5
1328 BD
DATA
FILTER
2
FILTER SWITCH
3
GND
4
PREAMP
DC SERVO
FILTER
gm
60k
+
–
+
COMPARATOR
BIAS
C4
330pF
C6
1000pF
HIGH: SIR
LOW: FIR AND 4ppm
C2
4.7
F
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