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參數(shù)資料
| 型號(hào)： | LT1319CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 搖控器 |
| 英文描述： | Multiple Modulation Standard Infrared Receiver |
| 中文描述： | INFRARED, RECEIVER IC, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | LT1319CS |
4
LT1319
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
FREQUENCY (Hz)
100k
P
1M
10M
100M
1319 G01
5
4
3
2
1
0
–1
–2
–3
–4
–5
T
A
= 25
°
C
50pF
30pF
10pF
Preamp Frequency Response vs
Input Capacitance
HIGHPASS CORNER FREQUENCY (Hz)
C
1k
100k
10k
1M
10M
1319 G03
1000
100
10
1
T
A
= 25
°
C
HIGHPASS CORNER FREQUENCY (Hz)
C
100
10k
100k
1M
1319 G02
1k
1000
100
10
1
0.1
T
A
= 25
°
C
Preamp Highpass vs
Capacitance on FILT1
Gain Stage Highpass vs
Capacitance on FILT2 or FILT2L
Preamp Output Noise vs
Input Capacitance
Input-Referred Noise vs
Lowpass Filter on PREOUT
FILTIN- or FILTINL-
Referred
Threshold Voltage vs R
T1
R
T1
(k
)
20
T
1.0
0.9
0.8
0.7
0.6
0.5
1319 G06
30
40
T
A
= 25
°
C
CIRCUIT DESCRIPTIOU
The LT1319 is a general purpose low noise, high speed,
high gain, infrared receiver designed to easily provide IR
communications with portable computers, PDAs, desktop
computers and peripherals. The receiver takes the photo-
current from an infrared photodiode (Siemens BPW34FA
or Temic BPV22NF) and performs a current-to-voltage
conversion. After external filtering that is tailored for the
desired communication standard, two filter buffers are
provided. There are dual gain chains with nominal gain of
400V/V that feed internal comparators with hysteresis. The
comparator thresholds are set externally with a current into
the V
TH
pin. The high frequency comparator has a response
time of 25ns and is well-suited to high data rates.
The low frequency comparator responds in 60ns and is
useful for more modest data rates such as Sharp/Newton
and IRDA-SIR. The circuit also contains shutdown circuitry
to reduce power consumption. Rejection of ambient inter-
ference is accomplished with AC coupling loops around the
preamp and the two gain stages. The rejection frequency is
set with an internal resistor and an external capacitor to
ground. This feature allows changing of the break fre-
quency by simply switching in additional capacitors. To aid
in rejection of power supply noise there is internal supply
regulation and a fully differential topology after the filter
buffers.
FREQUENCY (Hz)
P
√
H
250
200
150
100
50
0
10k
1M
10M
100M
1319 G04
100k
10pF
30pF
50pF
T
A
= 25
°
C
FILTER CUTOFF FREQUENCY (MHz)
0.1
I
20
15
10
5
0
1
10
1319 G05
T
A
= 25
°
C
R
FILTER
= 1k
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