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. PIN CONNECTION (top view) SCHEMATIC DIAGRAM April 1993 1/6 TDA0161 ABSOLUTE MAXIMUM RATINGS Symbol VCC Tj Tstg Parameter Value 35 +150 –55 to +150 Supply Voltage Junction Temperature Storage Temperature Range 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 fosc fO ∆ICC Rn Hyst 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. Max. 35 1 8 10 Unit V V mA 12 mA 1 µs 1 (100 x C3 (nF)) 0 0.9 R1 0.5 R1 10 10 20 MHz kHz µA 1.1 R1 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 2/6 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. TDA0161 TYPICAL APPLICATIONS Detection Range (*) L1 (µH) C1 (pF) fosc (kHz) R1 (kΩ) C2 pF 2mm 30 (1) 120 2650 6.8 47 5mm 300 (2) 470 425 27 470 10mm 2160 (3) 4700 50 27 3300 (*) Ingot steel target COIL CHARACTERISTICS Core Coil Former Wire** Number of Turns 1 Cofelec 432 FP 9 x 5 SE 1/2 CAR 091 - 2 THOMSON Fils et Câbles Thomrex 14 (14/100mm) 40 2 Cofelec 432 FP 14 x 8 SE 1/2 CAR 142 - 2 THOMSON Fils et Câbles Thomrex 14 (14/100mm) 100 3 Cofelec 432 FP 26 x 16 SE 1/2 CAR 262 - 2 THOMSON Fils et Câbles Thomrex 14 (14/100mm) 200 ** The above results are obtained with single wire coil. When using Litz wire instead of single wire, the parallel resistance of the coil comes higher and the value of R1 may be increased, resulting in better sensitivity. be- 3/6 TDA0161 MINIDIP PACKAGE MECHANICAL DATA mm DIM. MIN. A TYP. MAX. MIN. 3.32 TYP. MAX. 0.131 a1 0.51 0.020 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 D E 10.92 7.95 9.75 0.430 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 I 5.08 0.200 L Z 4/6 inch 3.18 3.81 1.52 0.125 0.150 0.060 TDA0161 SO8 PACKAGE MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.069 0.25 a2 MAX. 0.004 0.010 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45° (typ.) D 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.15 0.157 L 0.4 1.27 0.016 0.050 M S 0.6 0.024 8° (max.) 5/6 TDA0161 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 6/6