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參數(shù)資料
| 型號(hào)： | AIC1863CS |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | IR Preamplifier for Remote Control System |
| 中文描述： | 紅外前置放大器遠(yuǎn)程控制系統(tǒng) |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 112K |
| 代理商： | AIC1863CS |
AIC1863
6
n
TYPICAL PE R F OR MANCE CHAR ACTE R ISTICS
(Continued)
Pin 5 DC Voltage vs. Input DC Current
0
1
2
3
4
P
0
20
40
60
Input DC Current (
μ
A)
80
100
120
140
160
180
200
Ta=25
°
C
V
CC
=5V
n
APPLICATION INFOR MATIONS
l
THE OPERATION
AUTOMATIC BIAS LEVEL CONTROL
An ABLC (Automatic Bias Level Control) circuit is
built into the input section to prevent the input level
from being saturated by the external disturbing
lights, such that this circuit is actuated by a strong
external disturbing light to fix the bias level of the
input terminal.
TRANS-IMPEDANCE AMPLIFIER (T.I.A.)
The Trans-impedance amplifier is an inverted ampli-
fier with a sufficiently low input resistance, which
amplifies the input photocurrent pulses. The resis-
tance of the input at the signal frequency should
not be too high. Otherwise the wanted signal would
be lost to the junction capacitance of photodiode.
AUTO-GAIN CONTROL AMPLIFIER (A.G.C.)
The voltage gain of auto-gain control amplifier is
controlled by the voltage at CA pin. In so doing, it
supports the long-time interference suppression of
the evaluation circuit.
EVALUATION CIRCUIT
The signal delivered from the band-pass filter is
compared with a reference by the detector com-
parator. This reference is determined by the short-
time boost circuit and the long-time control circuit.
The inherent offset of the detector comparator and
the reference determine the sensitivity of the
evaluation circuit. The integrator is controlled by the
above mentioned comparison. Its output is used to
control the output stage after being processed
through a schmitt-trigger. Use of the integrator
keeps the output free of short-time interference.
The ground of the evaluation circuit is routed out
separately at pin 4, in order to minimize effect of
the output switching edges.
SHORT-TIME BOOST CIRCUIT (S.B.C.)
The short-time boost circuit reduces the sensitivity
of the evaluation circuit after reception of a signal.
This prevents short-time interference from affecting
the output. The reduction in sensitivity is achieved
by boosting the reference input of the detector
comparator.
LONG-TIME CONTROL CIRCUIT (L.C.C.)
The long-time control circuit improves the circuit’ s
resistance to long-time interference by adapting the
sensitivity of the evaluation circuit and the amplifi-
cation of the AGC amplifier. Reduction of the
evaluation circuit sensitivity is thereby achieved in
the same way, as for the SBC, by raising the refer-
ence input of the detector comparator. The external
capacitor C1 is charged as long as the signal is
delivered from band pass filter and the voltage of C1
provides the necessary control voltage for AGC
amplifier.
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