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| GL3276A GL3276A Description The GL3276A is a bipolar analog ICs specifically developed for use in infrared remote control system receiving preamplifiers. Capable of accepting a photodiode directly, these ICs house a high gain initial amplifier, a limiter, a band-pass filter, a detection circuit and a waveform shaping circuit assembled on a single chip. Pin configuration (SOP) * Less changes of malfunction associated with a high-frequency lighting fluorscent lamp internal trap circuit. * The central frequency can be varied with an external resistance: fo=30 to 80KHz fo rimming reduce central frequency variance. * Few external parts. Internal pull-up resistance and power filter resistance. Lower-capacitance external capacitor * Open collector output Open collector output with a pull-up resistance. Features VCC1 Out VCC2 fo 1 2 GL3276A 3 4 8 7 6 5 IN+ INCD GND Block Diagram 4 3 f0 VCC2 RS 1 VCC1 20 BPF Initial Stage amplifier Limiter + TRAP Waveform shaper IN+ Detector RL OUT 2 OUTPUT ABLC IN7 GND 5 CD 20 R1 C1 C2 1 GL3276A Absolute Maximum Ratings(Ta=25 ) E SYMBOL VCC IOUT PD TOPR TSTG PARAMETER Supply voltage Output Current Allowable power dissipation Operating temperature Storage temperature VALUE 6.0 2.5 270 - 20 to +75 -40 to +125 UNIT V mA mW E E Recommended Operating Condition SYMBOL VCC fIN PARAMETER Supply voltage Input frequency MIN 4.5 30 TYP 5.0 38 MAX 5.5 80 UNIT V KHz Electrical characteristics (VCC = 5.0V, Ta = 2.5 ) E SYMBOL ICC VIN AV FBW rIN tPW1 Output pulse width tPW2 VOL VOH Note 1 : rIN = Low Level output voltage Low Level output voltage 47 ( VIN VX ) 1 PARAMETER Supply current Input voltage Voltage gain BPF bandwidth Input impedance TEST CONDITION MIN TYP 1.2 MAX 2.8 3.1 1.7 80 3.0 160 770 770 UNIT mA V dB KHz K U S REMARK IIN = 0A IIN=-330 A fIN=38kHz VIN=30 VP-P -3dB Bandwidth VIN=30 VP-P fIN=38kHz CW VIN=0.2 VP-P fIN=38kHz burstwave VIN=500 VP-P fIN=38kHz burstwave VIN=50mVP-P 2.0 0.6 70 2.0 80 440 440 2.5 0.8 76 2.5 110 note * 1 note S * 1 0.2 4.8 5.0 0.4 V V K Uwhere VIN=input level, VX=test value) ( 2 : input burst wave form output pulse 600 S 600 S 38KHz Carrier 2 GL3276A Pin Description NO. 1 3 5 SYMBOL VCC1 VCC2 GND Power input Power output Ground PIN FUNCTION * Apply a voltage of 5V 3/410 % to pin 1. As the power is output to pin 3 through the internal power filter resistance, connect an electrolytic capacitor to pin 3. * With an internal impedance of 110 K U(typ.) pin 8 can accept a PIN photodiode directly. An automatic bias level control (ABLC) circuit prevents the input from being saturated by external light, assuring bias level stability for the input pin. * Initial amplifier differential inverted output. Its gain can be set up with an external impedance. * The central frequency of the band-pass filter can be varied with an external resistance. A built-in trap circuit prevents malfunctions associated with a highfrequency lighting fluorescent lamp. * Pin to which a detection capacitor is connected. * Open collector output with pull-up resistance. Its capability to drive a CMOS or TTL makes for easy connection with a receiving microcomputer. The GL3276A has an active low output. 8 IN + Input 7 IN - Initial amplifier Gain setup BPF frequency setup Detection capacitor Output 4 fo 6 CD 2 OUT Sample Application Circuits 8 Pin Plastic SOP C1 1500pF 0 to 1k 7 IN 6 CD 5 GND 0.01F Photo diode 8 IN + R1 GL3276A VCC1 1 OUT 2 VCC2 3 f0 4 Power supply Output 130 k UR2) ( 47 F 3 GL3276A Typical Characteristics (TA = 25 E ) Supply Current vs. Supply Voltage Frequency vs. Resistance (R2) Vcc=5V 2.5 90 80 ICC-Supply Current-mA 2 1.5 fo - Frequency-kHz 2.5 3 3.5 4 4.5 5 5.5 6.5 70 60 50 40 1 0.5 30 20 40 60 80 100 120 140 160 180 200 VCC-Supply Voltage R2-Resistance-k U Voltage Gain vs. Input Frequency 82 90 80 VCC=5V Gain vs. Capacitance(C1) Gain -dB 70 60 50 40 30 20 10 0 25 30 35 40 45 50 AV-Voltage Gain -dB R2=130k U Vi=30 Vp-p i 78 74 V-Voltage 70 66 1000 2000 3000 4000 5000 fIN-Input Frequency CI-Capacitance-pF Frequency 4 |
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