TDA0161 - ST Microelectronics

TDA0161 PROXIMITY DETECTORS

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 cu.

Features

e 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 4kΩ < R1 < 50kΩ, 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. 3.