GL3276A GL3276A Pin configuration 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. (SOP) Features • 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. VCC1 1 Out 2 8 IN+ 7 IN- GL3276A VCC2 3 6 CD fo 4 5 GND Block Diagram 4 3 f0 1 VCC1 RL Detector IN+ Waveform shaper 20 VCC2 RS BPF Initial Stage amplifier Limiter + TRAP ABLC IN7 CD GND 5 20 C2 R1 C1 1 OUT 2 OUTPUT GL3276A Absolute Maximum Ratings(Ta=25 ¡ )É SYMBOL PARAMETER VALUE UNIT VCC Supply voltage 6.0 V IOUT 2.5 mA 270 mW TOPR Output Current Allowable power dissipation Operating temperature - 20 to +75 ¡ É TSTG Storage temperature -40 to +125 ¡ É PD Recommended Operating Condition SYMBOL PARAMETER MIN TYP MAX UNIT VCC Supply voltage 4.5 5.0 5.5 V fIN Input frequency 30 38 80 KHz Electrical characteristics (VCC = 5.0V, Ta = 2.5¡ )É SYMBOL PARAMETER ICC Supply current VIN Input voltage AV Voltage gain FBW BPF bandwidth rIN Input impedance tPW1 Output pulse width tPW2 TEST CONDITION IIN = 0A IIN=-330 µA fIN=38kHz VIN=30 µVP-P -3dB Bandwidth VIN=30 µVP-P fIN=38kHz CW VIN=0.2 µVP-P fIN=38kHz burstwave VIN=500 µVP-P fIN=38kHz burstwave VIN=50mVP-P Low Level output voltage Low Level output voltage VOL VOH Note 1 : rIN = 47 ( VIN MIN TYP MAX UNIT 1.2 2.8 mA 2.0 0.6 2.5 0.8 3.1 1.7 V 70 76 80 dB 2.0 2.5 3.0 KHz 80 110 160 K§ Ù 770 µS 440 440 0.2 4.8 5.0 770 µS 0.4 V REMARK note * 1 note * 1 V K§ Ù(where VIN=input level, VX=test value) VX ) 1 2 : input burst wave form output pulse 600 µS 600 µS 2 38KHz Carrier GL3276A Pin Description NO. SYMBOL 1 VCC1 Power input 3 VCC2 Power output 5 GND Ground PIN FUNCTION 8 IN + Input 7 IN - Initial amplifier Gain setup 4 fo BPF frequency setup 6 CD Detection capacitor 2 OUT • Apply a voltage of 5V ¡ ¾10 % 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§ Ù(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. Output Sample Application Circuits 8 Pin Plastic SOP Photo diode C1 1500pF R1 0 to 1k 8 7 IN + IN - 0.01µF 6 5 CD GND GL3276A VCC1 OUT VCC2 f0 1 2 3 4 Power supply Output 130 k§ Ù ( R 2) 47 µF 3 GL3276A Typical Characteristics (TA = 25¡ É) Supply Current vs. Supply Voltage Frequency vs. Resistance (R2) Vcc=5V 90 fo - Frequency-kHz 80 2 1.5 1 70 60 50 40 0.5 30 2.5 3 3.5 4 4.5 5 5.5 20 6.5 40 60 80 100 120 140 160 180 200 R2-Resistance-k§ Ù VCC-Supply Voltage Gain vs. Capacitance(C1) Voltage Gain vs. Input Frequency 90 VCC=5V 80 R2=130k§ Ù Vi=30¥ V ì p-p 78 AV-Voltage Gain-dB Gain-dB 82 V-Voltage ICC-Supply Current-mA 2.5 70 60 50 40 30 74 70 66 20 10 0 25 30 35 40 45 50 1000 fIN-Input Frequency 2000 3000 4000 CI-Capacitance-pF Frequency 4 5000