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| KA2181 REMOTE CONTROL PREAMPLIFIER REMOTE CONTROL PREAMPLIFIER The KA2181 is a silicon monolithic integrated circuit designed for a remote control preamplifier of infrared signals. This device has features of low power, high sensitivity and wide supply voltage. 8-SIP FUNCTIONS * AMP * ABLC * LIMITER & LEVEL SHIFT * PEAK DET * SHAPING FEATURES * Wide operation voltage VCC=6 to 14.4V * Low power consumption ICC=2.5mA Typ. ORDERING INFORMATION * High input sensitivity 50VP-P Typ. * Peak detector Device Package Operating Temperature * Small size package 8-SIP KA2181 8-SIP -20C ~+75C * A minimum number of parts are required * Designed for use with the KS5803 remote control transmitter IC. BLOCK DIAGRAM + VCC 6 ~14.4V + Tuning Coil Peak Hold Capacitor 3 BIAS Input Limiter & Level shift PIN-Photo Diode 4 8 Power Supply ABLC 6 By-pass Capacitor 5 Ground Shaping 7 AMP Peak DET 1 Output 2 Integral Capacitor + Fig. 1 KA2181 REMOTE CONTROL PREAMPLIFIER ABSOLUTE MAXIMUM RATINGS (TA=25C) Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD TOPR TSTG Value 15 270 -20~+75 -45~+125 Unit V mW C C RECOMMENDED OPERATING CONDITIONS Characteristic Power Supply Input Frequency Symbol VCC f IN Min. 6.0 30 Typ. 8.5 Max. 14.4 50 Unit V KHz ELECTERICAL CHARACTERISTICS (TA=25C, VCC=8.5V, fIN=40KHz) Characteristic Symbol ICC VIN 1 VIN 2 AVL IN IN VOL IOH Test Conditions Min. 1.5 2.1 3.4 40 Typ. 2.5 2.6 4.1 60 50 60 - Max. 3.5 3.1 4.9 100 80 0.5 Unit mA V V dB VP-P K V A Supply Current Input Terminal Voltage Input Terminal Voltage 1st Stage Voltage Gain Detection Input Voltage Input Impedance Output Voltage Output Leakage Current Noise IIN=70A #7-#3, VOUT=500mVP-P IOL=0.1mA, IN=7mVP-P VOH=14.4V Input Open - 2 Output Terminal is not fall KA2181 TYPICAL APPLICATION CIRCUITS REMOTE CONTROL PREAMPLIFIER 1K 3300pF L 10F + 150K + 47F VCC + 10F 3 BIAS 4 8 100K Peak DET Limiter & Level shift PIN-Photo Diode ABLC 6 47F 22 5 Shaping 7 AMP 1 Out 2 0.033F + Fig. 2 TEST CIRCUITS L . . . 5mH C . . . 3300pF R . . . 100K KA2181 8 10F 7 22 6 5 4 R C 3 VOUT 2 1 OUT + 150K + VIN 51 4.7F L 0.033F 100K + 10F + 100F VCC=8.5V Fig. 3 |
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