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AIC1863
IR Preamplifier for Remote Control System
n FEATURES
l
n DESCRIPTION
The AIC1863 is a high performance infrared r e mote control preamplifier. Especially, it has e xcellent interference suppression capability. The infrared pulses arriving at the photodiode are treated by the trans-impedance amplifier and amplified by the auto-gain control amplifier, limitter 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, which prevent interference voltages from affecting the output.
Only Two External Components Required Other than the Photodiode. Easy to Integrate into Module due to Small Chip Size. Minimized Chances of Malfunction Due to Ambient Light. Low Power Consumption. Center Frequency of Band Pass Filter Adjustable by an External Resistor. Microcomputer Compatible.
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n APPLICATIONS
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IR Remote Control Receivers for Consumer Electronic Products, such as TVs, VCRs, VCD/DVD Players, Audio Devices, Air Conditioners, Electric Fans...etc.
n TYPICAL APPLICATION CIRCUIT
Vcc (+5V) 1 CA 2 NC C1 0.1F VOUT 3 OUT 4 DGND AIC1863 VCC 8 FO 7 R1 110K(fo =38KHz)
AGND 6 IN 5
Photo Diode
IR Remote Control Receiver
n ORDERING INFORMATION
Analog Integrations Corporation www.analog.com.tw DS-1863-00 TEL: 886-3-5772500
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC FAX: 886-3-5772510
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AIC1863
AIC1863 XX PACKAGE TYPE S: SMALL OUTLINE D: DICE TEMPERATURE RANGE C: 0 C~+70 C
ORDER NUMBER
AIC186 3CS (PLASTIC SO)
PIN CONFIGURATION
TOP VIEW CA 1 NC 2 OUT 3 DGND 4 8 VCC 7 FO 6 AGND 5 IN
AIC186 3CD (DICE)
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..................................................... ... ... ... ... ....................................... 5.5V Input Voltage .......................................................... ... ... ... ... ................................. 5 Vp-p Operating Temperature Range ........................................ ... ... ... ..................... -20C~80C
Storage Temperature Range .................................... ... ... ... ... .................... - 65C~ 150C
n TEST CIRCUIT
Vcc(+5V) 1 CA + C1 VOUT 0.1F 2 NC 3 OUT 4 DGND AIC1863 VCC 8 FO 7 AGND 6 IN 5 S4 S5 C3 + 0.47F S3 R2 47K + C2 S2 R1 110K
IIN 100A
0.47F VIN S1
n ELECTRICAL CHARACTERISTICS (VCC= 5V, Ta=25C, unless otherwise
specified.)
PARAMETER Supply Voltage Input Pin Voltage (1) Input Pin Voltage (2) Low Level Output Voltage IIN=0A IIN=100A TEST CONDITIONS SYMBOL Vcc VIN1 VIN2 VOL MIN. 4.5 3.8 1.5 TYP. 5.0 4.2 2.1 0.1 MAX. 5.5 4.4 2.7 0.3 UNIT V V V V
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AIC1863
High Level Output Voltage Voltage Gain BPF Characteristics Input Impedance 100VP-P , 38KHz 100VP-P , 28KHz, 35KHz, 41KHz, 48KHz (note 1) 0.5V P-P , 38KHz (note 2) 100VP-P , 38KHz 600S ON Time, 0.2 Duty Cycle
VOH AV AQ RIN
4.70 76 4 4
4.94 81 9 11
V dB dB K S
Detecting Ability (1)
TD1
360
520
680
3
AIC1863
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER Detecting Ability (2) TEST CONDITIONS 50mVP-P , 38KHz 600S ON Time, 0.2 Duty Cycle 100VP-P , 38KHz 600S ON Time, 0.2 Duty Cycle 100VP-P , 38KHz Switch Off Delay Time 600S ON Time, 0.2 Duty Cycle C1=0.1F TOFF 150 220 400 S SYMBOL TD2 MIN. 540 TYP. 670 MAX. 800 UNIT S
Switch On Delay Time
TON
100
250
400
S
LCC Slew Rate Quiescent Current
dv/dt ICC 0.4
0.8 0.7 1.0
V/S 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 RIN= VI / VX - 1
n BLOCK DIAGRAM
AUTOMATIC BIAS LEVEL CONTROL 5 IN VB S.B.C. T.I.A.
+
A.G.C.
LIMITTER AMP.
B.P.F.
DETECTOR COMPARATOR
INTEGRATOR
WAVEFORM SHAPER
3 OUT
L.C.C.
8 VCC
6 AGND
7 FO
1 CA
4 DGND
4
AIC1863
n PIN DESCRIPTIONS
PIN 1: CA PIN 2: NC PIN 3: OUT - LCC capacitor connection pin. - No Connection. - Output pin. PIN 5: IN - Input pin (photodiode connection pin). PIN 6: AGND - Analog ground. PIN 7: FO PIN 8: VCC - Band pass filter center frequency setting pin. - Power supply pin.
PIN 4: DGND - Digital ground.
n TYPICAL
0.8
PERFORMANCE CHARACTERISTICS
Supply Current vs. Temperature
0.75
Quiescent Current vs. Supply Voltage
0.75
Quiescent Current (mA)
Ta=25 C
0.7
Supply Current (mA)
0.70
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
0
Supply Voltage (V)
Temperature ( C)
20
40
60
80
Voltage Gain vs. Input Signal Frequency
70
80
Center Frequency vs. Externally Attached Resistance to Pin 7
Center Frequency (KHz)
Ta=25C VCC=5V
60
Voltage Gain (dB)
70
Ta=25 C VCC =5V
50
60
40
50
30
40
20
10 20 30 40 50 100
60
Input Signal Frequency (KHz)
Externally Attached Resistance to Pin 7 (K )
70
80
90
100
110
120
130
140
150
160
5
AIC1863
n TYPICAL
4
PERFORMANCE CHARACTERISTICS (Continued)
Pin 5 DC Voltage vs. Input DC Current
Pin 5 DC Voltage (V)
3
Ta=25C V CC=5V
2
1
00
20
40
60
80
100
120
140
160
180
200
Input DC Current ( A)
n APPLICATION INFORMATIONS
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 amplifier with a sufficiently low input resistance, which amplifies the input photocurrent pulses. The resistance 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 comparator. This reference is determined by the shorttime 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 amplification of the AGC amplifier. Reduction of the evaluation circuit sensitivity is thereby achieved in the same way, as for the SBC, by raising the reference 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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AIC1863
l DESIGN GUIDE
SETTING THE CENTER FREQUENCY OF BAND PASS FILTER Connect a resistor from pin 7 to VCC to set the center frequency of band pass filter. The center frequency will be lower if the resistor value is higher. The relationships between center frequency of band pass filter and the resistance of external resistor are tabulated as below: f0(KHz) 33 36 37 38 40 56.8 R1(K) 130 118 114 110 104 72 time. Otherwise, with the transmitted data signal with duty cycle higher than 0.4, the detection sensitivity will maintain unchanged for a proportional time period and gradually be reduced due to increasing control voltage at CA pin. Higher duty cycle enables more reduction of detection sensitivity in specific transmission time. Increasing the capacitance of C1 causes longer transmission time as duty cycle higher than the maximum allowable duty cycle. GROUNDING The AGND pin, DGND pin and all the external parts are recommended to be connected as much as possible to "one ground point" for good noise performance.
SETTING LCC CAPACITOR C1 With the transmitted data signal with duty cycle lower than 0.4 (average, during the whole transmission), the detection sensitivity is unchanged all the
n PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A A1
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80
MAX 1.75 0.25 0.51 0.25 5.00 4.00 1.27(TYP) 6.20 1.27
B C D E e
e A C A1
H L
L
5.80 0.40
B
7
AIC1863
n DIE DIMENSION
PIN 7
FO 137.5, 726.5 AGND 1477, 776.5
PIN6
PIN 5 PIN 8
IN 1447, 357.5 VCC 149.5, 373.5
CA 540, 107.5
OUT 1209, 104
PIN4
0, 0
PIN 1 PIN 3
DGND 1477, 64.5
UNIT: m
DIE SIZE: 1535 x 845 m 2 PAD SIZE: 100 x 100m DIE THICKNESS: 15 1.5 mil
2
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