AIC1863
IR Preamplifier for Remote Control System
n FEATURES
n DESCRIPTION
The AIC1863 is a high performance infrared re-
Only Two External Components Required Other
than the Photodiode.
mote control preamplifier. Especially, it has ex-
l
Easy to Integrate into Module due to Small Chip
Size.
infrared pulses arriving at the photodiode are
l
Minimized Chances of Malfunction Due to Ambient Light.
amplified by the auto-gain control amplifier, limit-
l
Low Power Consumption.
l
Center Frequency of Band Pass Filter Adjustable by an External Resistor.
l
Microcomputer Compatible.
l
cellent interference suppression capability. The
treated by the trans-impedance amplifier and
ter amplifier, and band-pass filter. The following
evaluation circuits, including the comparator, integrator, and schmitt-trigger, demodulate the
transmitted digital signal. Reduction of sensitivity
due to external interference is achieved by the
short-time boost and long-time control circuits,
n APPLICATIONS
l
which prevent interference voltages from affecting
IR Remote Control Receivers for Consumer
the output.
Electronic Products, such as TVs, VCRs,
VCD/DVD Players, Audio Devices, Air Conditioners, Electric Fans... etc.
n TYPICAL APPLICATION CIRCUIT
Vcc (+5V)
C1
0.1µF
V OUT
1 CA
VCC 8
2 NC
FO
3 OUT
7
AGND 6
4 DGND
IN
R1
11 0K(fo =38KHz)
5
AIC1863
Photo
Diode
IR Remote Control Receiver
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1863-01 012102
1
AIC1863
n ORDERING INFORMATION
AIC1863CXXX
PIN CONFIGURATION
PACKING TYPE
TR: TAPE & REEL
TB: BAG
SO-8
TOP VIEW
PACKAGE TYPE
S: SMALL OUTLINE
D: DICE
Example: AIC1863CSTR
à in SO-8 Package & Taping & Reel
CA 1
8
VCC
NC 2
OUT 3
7
FO
6
AGND
DGND 4
5
IN
Dice
See Die Dimensions for details.
Packing Type
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..................................................… … … … … ....................................... 5.5V
Input Voltage .......................................................… … … … … ................................. 5 Vp-p
Operating Temperature Range
.....................................… … … … ..................... -20°C~80°C
Storage Temperature Range .................................… … … … … .................... - 65°C~ 150°C
n TEST CIRCUIT
V cc (+5V)
+
C1
VOUT
0.1µF
1 CA
VCC 8
2 NC
FO 7
3 OUT
AGND 6
4 DGND
AIC1863
R1
110K
IN 5
S4
S5
C3 +
0.47µF
S3
IIN
100µA
S2
R2 47K
+
C2
0.47µF
S1
VIN
2
AIC1863
n ELECTRICAL CHARACTERISTICS (VCC= 5V, TA=25°C, unless otherwise
specified.)
PARAMETER
TEST CONDITIONS
Supply Voltage
SYMBOL
MIN.
TYP.
MAX.
UNIT
Vcc
4.5
5.0
5.5
V
Input Pin Voltage (1)
IIN=0µA
VIN1
3.8
4.2
4.4
V
Input Pin Voltage (2)
IIN=100µA
VIN2
1.5
2.1
2.7
V
0.1
0.3
V
Low Level Output Voltage
VOL
High Level Output Voltage
VOH
4.70
4.94
V
Voltage Gain
100µVP-P , 38KHz
AV
76
81
dB
BPF Characteristics
100µVP-P , 28KHz, 35KHz,
41KHz, 48KHz (note 1)
AQ
4
9
dB
Input Impedance
0.5V P-P , 38KHz (note 2)
RIN
4
11
KΩ
Detecting Ability (1)
100µVP-P , 38KHz
600µS ON Time,
0.2 Duty Cycle
TD1
360
520
680
µS
Detecting Ability (2)
50mVP-P , 38KHz
600µS ON Time,
0.2 Duty Cycle
TD2
540
670
800
µS
Switch On Delay Time
100µVP-P , 38KHz
600µS ON Time,
0.2 Duty Cycle
TON
100
250
400
µS
150
220
400
µS
100µVP-P , 38KHz
Switch Off Delay Time
600µS ON Time,
0.2 Duty Cycle
TOFF
LCC Slew Rate
C1=0.1µF
dv/dt
Quiescent Current
ICC
0.8
0.4
0.7
V/S
1.0
mA
NOTE 1: Ratio of the AC level at 35KHz and the AC level at 28KHz denotes AQ1.
measured value (f = 35KHz)
AQ1= 20log
measured value (f = 28KHz)
Ratio of the AC level at 41KHz and the AC level at 48KHz denotes AQ2.
measured value (f = 41KHz)
AQ2= 20l o g
measured value (f = 48KHz)
NOTE 2: Input level denotes VI and measured level denotes VX, then
47K Ω
RIN=
VI / VX - 1
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AIC1863
n TYPICAL
PERFORMANCE CHARACTERISTICS
0.8
0.75
0.70
Supply Current (mA)
Quiescent Current (mA)
0.75
TA =25° C
0.7
Vcc= 5V
0.65
0.65
0.60
0.6
0.55
0.55
0.5
4.5
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
0.50
-20
Supply Voltage (V)
Fig. 1 Quiescent Current vs. Supply Voltage
0
20
40
60
80
Temperature (° C)
Fig. 2 Supply Current vs. Temperature
70
Voltage Gain (dB)
Center Frequency (KHz)
TA=25 °C
V CC=5V
80
60
70
Ta=25° C
VCC =5V
50
60
40
50
30
20
40
10
20
30
40 50
60
100
Input Signal Frequency (KHz)
Fig. 3 Voltage Gain vs. Input Signal Frequency
70
80
90
100
110
120
130
140
150
160
Externally Attached Resistance to Pin 7 (KΩ )
Fig. 4 Center Frequency vs. Externally Attached
Resistance to Pin 7
Pin 5 DC Voltage (V)
4
TA =25° C
V CC=5V
3
2
1
0
0
20
40
60
80
100
120
140
160
180
200
Input DC Current (µ A)
Fig. 5 Pin 5 DC Voltage vs. Input DC Current
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AIC1863
n BLOCK DIAGRAM
AUTOMATIC
BIAS LEVEL
CONTROL
S.B.C.
T.I.A.
5
IN
VB
+
A.G.C.
LIMITTER
AMP.
DETECTOR
COMPARATOR
B.P.F.
INTEGRATOR
WAVEFORM
SHAPER
3
OUT
L.C.C.
8
VCC
6
7
1
4
AGND
FO
CA
DGND
n PIN DESCRIPTIONS
PIN 1: CA
- LCC capacitor connection pin.
PIN 2: NC
- No Connection.
PIN 3: OUT
- Output pin.
PIN 4: DGND - Digital ground.
PIN 5: IN
- Input pin (photodiode connection pin).
PIN 6: AGND - Analog ground.
PIN 7: FO
- Band pass filter center frequency setting pin.
PIN 8: VCC
- Power supply pin.
n APPLICATION INFORMATIONS
l
THE OPERATION
AUTOMATIC BIAS LEVEL CONTROL
not be too high. Otherwise the wanted signal would
be lost to the junction capacitance of photodiode.
An ABLC (Automatic Bias Level Control) circuit is
built into the input section to prevent the input level
AUTO-GAIN CONTROL AMPLIFIER (A.G.C.)
from being saturated by the external disturbing
The voltage gain of auto-gain control amplifier is
lights, such that this circuit is actuated by a strong
controlled by the voltage at CA pin. In so doing, it
external disturbing light to fix the bias level of the
supports the long-time interference suppression of
input terminal.
the evaluation circuit.
TRANS-IMPEDANCE AMPLIFIER (T.I.A.)
EVALUATION CIRCUIT
The Trans-impedance amplifier is an inverted ampli-
The signal delivered from the band-pass filter is
fier with a sufficiently low input resistance, which
compared with a reference by the detector com-
amplifies the input photocurrent pulses. The resis-
parator. This reference is determined by the short-
tance of the input at the signal frequency should
time boost circuit and the long-time control circuit.
5
AIC1863
The inherent offset of the detector comparator and
l DESIGN GUIDE
the reference determine the sensitivity of the
SETTING THE CENTER FREQUENCY OF BAND
evaluation circuit. The integrator is controlled by the
PASS FILTER
above mentioned comparison. Its output is used to
Connect a resistor from pin 7 to VCC to set the
control the output stage after being processed
center frequency of band pass filter. The center fre-
through a schmitt-trigger. Use of the integrator
quency will be lower if the resistor value is higher.
keeps the output free of short-time interference.
The relationships between center frequency of band
The ground of the evaluation circuit is routed out
pass filter and the resistance of external resistor
separately at pin 4, in order to minimize effect of
are tabulated as below:
the output switching edges.
f0(KHz)
33
36
37
38
40
56.8
R1(KΩ)
130
118
114
110
104
72
SHORT-TIME BOOST CIRCUIT (S.B.C.)
The short-time boost circuit reduces the sensitivity
SETTING LCC CAPACITOR C1
of the evaluation circuit after reception of a signal.
With the transmitted data signal with duty cycle
This prevents short-time interference from affecting
lower than 0.4 (average, during the whole transmis-
the output. The reduction in sensitivity is achieved
sion), the detection sensitivity is unchanged all the
by boosting the reference input of the detector
time. Otherwise, with the transmitted data signal
comparator.
with duty cycle higher than 0.4, the detection sensitivity will maintain unchanged for a proportional
LONG-TIME CONTROL CIRCUIT (L.C.C.)
time period and gradually be reduced due to in-
The long-time control circuit improves the circuit’s
creasing control voltage at CA pin. Higher duty cy-
resistance to long-time interference by adapting the
cle enables more reduction of detection sensitivity
sensitivity of the evaluation circuit and the amplifi-
in specific transmission time. Increasing the ca-
cation of the AGC amplifier. Reduction of the
pacitance of C1 causes longer transmission time
evaluation circuit sensitivity is thereby achieved in
as duty cycle higher than the maximum allowable
the same way, as for the SBC, by raising the refer-
duty cycle.
ence input of the detector comparator. The external
capacitor C1 is charged as long as the signal is
GROUNDING
delivered from band pass filter and the voltage of C1
The AGND pin, DGND pin and all the external parts
provides the necessary control voltage for AGC
are recommended to be connected as much as
amplifier.
possible to “one ground point” for good noise performance.
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AIC1863
PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
H
E
e
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
e
A
A1
C
B
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
L
n DIE DIMENSION
PIN 7
PIN6
AGND
1477, 776.5
FO
137.5, 726.5
PIN 5
IN
1447, 357.5
PIN 8
VCC
149.5, 373.5
CA
540, 107.5
OUT
1209, 104
PIN4
0, 0
DGND
1477, 64.5
PIN 1
PIN 3
UNIT: µm
DIE SIZE:
1535 × 845 µm
2
PAD SIZE:
100 × 100µm
DIE THICKNESS: 15 ± 1.5 mil
2
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AIC1863
8