TDA0161 april 1993 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 vari- ations 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 cur- rent is high or low according to the presence or the absence of a close metallic object. pin connection (top view) schematic diagram 1/6
electrical characteristics TDA0161dp -40 o c < t amb < +100 o c TDA0161fp -40 o c < t amb < +100 o c ptot < 150mw, unless otherwise specified symbol parameter min. typ. max. unit v cc supply voltage 4 35 v reverse voltage limitation (i cc = -100 ma) TDA0161 1 v i cc supply current, close target (t amb = +25 o c) +4v < v cc < +35v TDA0161 8 10 12 ma i cc supply current, remote target +4v < v cc < +35v TDA0161 1 ma supply current transition time c3 = 0 c3 1 0 1 (100 x c3 (nf)) m s f osc oscillator tuning frequency 10 mhz f o output frequency (c3 = 0) 0 10 khz d i cc output current ripple - c3 = 0, c2 (pf) > 150/f osc (mhz) 20 m a r n negative resistance on terminals a and e 4k w < r1 < 50k w , f osc < 3 mhz 0.9 r1 r1 1.1 r1 h yst hysteresis at detection point c2 (pf) > 150/f osc (mhz) 0.5 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. absolute maximum ratings symbol parameter value unit v cc supply voltage 35 v t j junction temperature +150 o c t stg storage temperature range C55 to +150 o c 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 i cc = 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 i cc 1ma (pins g and d). eddy currents induced by coil l1 in a metallic body, determine loss resistance rp. TDA0161 2/6
typical applications detection range (*) l1 ( m h) c1 (pf) f osc (khz) r1 (k w ) 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 cables thomrex 14 (14/100mm) 40 2 cofelec 432 fp 14 x 8 se 1/2 car 142 - 2 thomson fils et cables thomrex 14 (14/100mm) 100 3 cofelec 432 fp 26 x 16 se 1/2 car 262 - 2 thomson fils et cables 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 o f the coil be- comes higher and the value of r1 may be increased, resulting in better sensit ivity. TDA0161 3/6
minidip package mechanical data dim. mm inch min. typ. max. min. typ. max. a 3.32 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 10.92 0.430 e 7.95 9.75 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 3.18 3.81 0.125 0.150 z 1.52 0.060 TDA0161 4/6
so8 package mechanical data dim. mm inch min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 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 0.6 0.024 s8 (max.) TDA0161 5/6
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 pat ents or other rights of t hird 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 compo nents in l ife support dev ices 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 - sing a- pore - spain - sweden - switzerland - taiwan - thaliand - united kingdom - u.s.a. TDA0161 6/6
|
