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TDA0161 PROXIMITY DETECTORS . . . OUTPUT CURRENT : 10mA OSCILLATOR FREQUENCY : 10 MHz SUPPLY VOLTAGE : + 4 TO + 35 V Minidip ORDERING NUMBER : TDA0161DP SO8 ORDERING NUMBER : TDA0161FP DESCRIPTION These monolithic integrated circuits are designed for metallic body detection by detecting the variations in high frequency Eddy current losses. With an external tuned circuit they act as oscillators. Output signal level is altered by an approaching metallic object. Output signal is determined by supply current changes. Independent of supply voltage, this current is high or low according to the presence or the absence of a close metallic object. SCHEMATIC DIAGRAM PIN CONNECTION (top view) April 1993 1/6 TDA0161 ABSOLUTE MAXIMUM RATINGS Symbol VCC Tj Tstg Parameter Supply Voltage Junction Temperature Storage Temperature Range Value 35 +150 ­55 to +150 Unit V o C o C ELECTRICAL CHARACTERISTICS TDA0161DP -40oC < Tamb < +100oC TDA0161FP -40oC < Tamb < +100oC Ptot < 150mW, unless otherwise specified Symbol VCC ICC ICC Parameter Supply Voltage Reverse Voltage Limitation (ICC = -100 mA) TDA0161 Supply Current, Close Target (Tamb = +25oC) TDA0161 +4V < VCC < +35V Supply Current, Remote Target TDA0161 +4V < VCC < +35V Supply Current Transition Time C3 = 0 C3 0 Oscillator Tuning Frequency Output Frequency (C3 = 0) Output Current Ripple - C3 = 0, C2 (pF) > 150/fosc (MHz) Negative Resistance on Terminals A and E 4k < R1 < 50k, fosc< 3 MHz Hysteresis at Detection Point C2 (Pf) > 150/fosc (MHz) Min. 4 Typ. 1 8 10 12 mA 1 1 (100 x C3 (nF)) 0 10 10 20 R1 1.1 R1 5 µs MHz kHz µA Max. 35 Unit V V mA fosc fO ICC Rn Hyst 0.9 R1 0.5 % * If the circuit is used at a frequency higher than 3MHz, it is recommended to connect a capacitor of 100pF between terminals E and D. OPERATING MODE Between terminals A and E, the integrated circuit acts like a negative resistance equal to the external resistor R1 connected between terminals B and H. The oscillation stops when loss resistance Rp of tuned circuit becomes smaller than R1. Then, the supply current will be ICC = 10mA (pins G and D). The oscillation sustains when loss resistance Rp of tuned circuit becomes higher than R1. Then, the supply current will be ICC 1mA (pins G and D). Eddy currents induced by coil L1 in a metallic body, determine loss resistance Rp. 2/6 TDA0161 TYPICAL APPLICATIONS Detection Range (*) 2mm 5mm 10mm (*) Ingot steel target L1 (µH) 30 300 2160 (1) (2) (3) C1 (pF) 120 470 4700 fosc (kHz) 2650 425 50 R1 (k) 6.8 27 27 C2 pF 47 470 3300 COIL CHARACTERISTICS Core 1 Cofelec 432 FP 9 x 5 SE Cofelec 432 FP 14 x 8 SE Cofelec 432 FP 26 x 16 SE Coil Former 1/2 CAR 091 - 2 1/2 CAR 142 - 2 1/2 CAR 262 - 2 Wire** THOMSON Fils et Cвbles Thomrex 14 (14/100mm) THOMSON Fils et Cвbles Thomrex 14 (14/100mm) THOMSON Fils et Cвbles Thomrex 14 (14/100mm) Number of Turns 40 2 100 3 200 ** The above results are obtained with single wire coil. When using Litz wire instead of single wire, the parallel resi