AIC1863 IR Preamplifier for Remote Control System n FEATURES n DESCRIPTION The AIC1863 is a high performance infrared re- l 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. ter amplifier, and band-pass filter. The following l Center Frequency of Band Pass Filter Adjustable by an External Resistor. evaluation circuits, including the comparator, in- Microcomputer Compatible. transmitted digital signal. Reduction of sensitivity l cellent interference suppression capability. The treated by the trans-impedance amplifier and tegrator, and schmitt-trigger, demodulate the due to external interference is achieved by the n APPLICATIONS l short-time boost and long-time control circuits, which prevent interference voltages from affecting IR Remote Control Receivers for Consumer Electronic Products, such as TVs, VCRs, VCD/DVD Players, Audio Devices, Air Conditioners, Electric Fans...etc. the output. n TYPICAL APPLICATION CIRCUIT Vcc (+5V) 1 CA VCC 8 2 NC C1 0.1µF VOUT FO 3 OUT AGND 6 4 DGND IN R1 7 110K(fo =38KHz) 5 AIC1863 Photo Diode IR Remote Control Receiver n ORDERING INFORMATION Analog Integrations Corporation www.analog.com.tw DS-1863-00 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 1 AIC1863 AIC1863 XX ORDER NUMBER PACKAGE TYPE S: SMALL OUTLINE D: DICE PIN CONFIGURATION TOP VIEW AIC186 3CS (PLASTIC SO) TEMPERATURE RANGE C: 0° C~+70° C CA 1 8 VCC NC 2 7 FO OUT 3 6 AGND 5 IN DGND 4 AIC186 3CD (DICE) 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 Vcc(+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 I IN 100µA S2 R2 47K + C2 0.47µF VIN S1 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 2 AIC1863 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 360 520 TD1 680 µS 3 AIC1863 n ELECTRICAL CHARACTERISTICS (Continued) PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT 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 0.8 ICC 0.4 V/S 0.7 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 n BLOCK DIAGRAM AUTOMATIC BIAS LEVEL CONTROL S.B.C. T.I.A. 5 IN VB + A.G.C. LIMITTER AMP. B.P.F. DETECTOR COMPARATOR INTEGRATOR WAVEFORM SHAPER 3 OUT L.C.C. 8 VCC 6 7 1 4 AGND FO CA DGND 4 AIC1863 n PIN DESCRIPTIONS PIN 1: CA - LCC capacitor connection pin. PIN 5: IN - Input pin (photodiode connection pin). PIN 2: NC - No Connection. PIN 6: AGND - Analog ground. PIN 3: OUT - Output pin. PIN 7: FO - Band pass filter center frequency setting pin. PIN 8: VCC - Power supply pin. PIN 4: DGND - Digital ground. n TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs. Temperature Quiescent Current vs. Supply Voltage 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 0 20 40 60 Temperature (° C) Supply Voltage (V) 80 Center Frequency vs. Externally Attached Voltage Gain vs. Input Signal Frequency Resistance to Pin 7 70 Center Frequency (KHz) Ta=25°C VCC=5V 80 Voltage Gain (dB) 60 70 Ta=25° C VCC =5V 50 60 40 50 40 30 20 10 20 30 40 50 Input Signal Frequency (KHz) 100 60 70 80 90 100 110 120 130 140 150 Externally Attached Resistance to Pin 7 (KΩ ) 160 5 AIC1863 n TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Pin 5 DC Voltage vs. Input DC Current 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) 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. 6 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(KΩ) 130 118 114 110 104 72 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 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. n 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 7 AIC1863 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 8