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rev 2 october 2005 1/12 12 tda0161 proximity detectors features 10ma output current oscillator frequency 10mhz supply voltage +4 to +35v description these monolithic integrated circuits are designed for metallic body detection by sensing variations in high frequency eddy current losses. using an externally-tuned circuit, they act as oscillators. the output signal level is altered by an approaching metallic object. the output signal is determined by supply current changes. independent of supply voltage, this current is high or low, according to the presence or absence of a closely located metallic object. so8 dip-8 www.st.com block diagram
tda0161 2/12 contents 1 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
tda0161 1 connections 3/12 1 connections figure 1. pin connections (top view)
2 electrical ratings tda0161 4/12 2 electrical ratings table 1. absolute maximum ratings 2.1 electrical characteristics ?40 < t a < +100c, p tot < 150mw, unless otherwise specified. symbol parameter value unit v cc supply voltage 35 v t j operating temperature range +150 c t stg storage temperature range ?55 to 150 c table 2. electrical characteristcs symbol parameter test conditions min. typ. max. unit v cc supply voltage 4 35 v reverse voltage limitation i cc = ?100ma -1 v i cc supply current close target ta = +25 c +4v < v cc < +35v 81012ma i cc supply current remote target +4v < v cc < +35v 1 ma supply current transition time c3 = 0 1 s c3 0 100 x c3 (nf) s f osc oscillator tuning frequency 10 mhz f o output frequency c3 = 0 0 10 khz ? i cc output current ripple c3 = 0, c2 (pf) > 150/f osc (mhz) 20 a r n negative resistance on terminals a and e 4k ? < r1 < 50k ? , f osc < 3mhz 0.9 r1 r1 1.1 r1 hyst hysteresis at detection point c2 (pf) > 150/f osc (mhz) 0.5 5 %
tda0161 3 operating mode 5/12 3 operating mode between pins 3 and 7, the integrated circuit acts like a negative resistor with a value equal to that of the external resistor r1 (connected between pins 2 and 4). the oscillation stops when the tuned circuit loss resistance (rp) becomes smaller than r1. as a result, i cc (close) = 10ma (pins 1 and 6). the oscillation is sustained when rp is higher than r1, and i cc (remote) = 1ma (pins 1 and 6). eddy currents induced by coil l1 in a metallic body determi ne the value of rp. figure 2. electrical scheme i cc (close) i cc (remote) if the circuit is used at frequency higher than 3mhz, it is recommended to connect a capacitor of 100pf between pins 7 and 6
4 typical applications tda0161 6/12 4 typical applications #) _ .ingot steel target ##).the above results are obtained with single wire coil. when using litz wire instead of single wire, the parallel resistance of the coil becomes higher and value of r1 may be increased, resulting in better sensitivity figure 3. application interface connection diagram table 3. detection range detection range (#) l1 ( h) c1 (pf) f osc (khz) r1 (k ? ) c2 (pf) 2mm 30 (1) 120 2650 6.8 47 5mm 300 (2) 470 425 27 470 10mm 2160 (3) 4700 50 27 3300 table 4. 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 - 2 100 3 cofelec 432 fp 26x 16 se 1/2 car 262 - 2 200
tda0161 4 typical applications 7/12 4.1 ___ typical application example figure 4. __ detection distance
5 package mechanical data tda0161 8/12 5 package mechanical data dim. mm inch min. typ. max. min. typ. max. a3.3 0.130 a1 0.7 0.028 b 1.39 1.65 0.055 0.065 b1 0.91 1.04 0.036 0.041 b0.5 0.020 b1 0.38 0.5 0.015 0.020 d9.80.386 e8.8 0.346 e2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 f7.10.280 i4.80.189 l3.3 0.130 z 0.44 1.6 0.017 0.063 p001f plastic dip-8 mechanical data
tda0161 5 package mechanical data 9/12 dim. mm. inch min. typ max. min. typ. max. a 1.75 0.068 a1 0.1 0.25 0.003 0.009 a2 1.65 0.064 a3 0.65 0.85 0.025 0.033 b 0.35 0.48 0.013 0.018 b1 0.19 0.25 0.007 0.010 c 0.25 0.5 0.010 0.019 c1 45 (typ.) d 4.8 5.0 0.188 0.196 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 f 3.8 4.0 0.14 0.157 l 0.4 1.27 0.015 0.050 m 0.6 0.023 s 8 (max.) so-8 mechanical data
tda0161 10/12 6 order codes part number temp range package packing tda0161dp 150 cdip-8 tube tda0161fp 150 cso8 tube TDA0161FPT 150 c so8 tape and reel
tda0161 7 revision history 11/12 7 revision history date revision changes 06-jan-2003 1 initial release. 12-oct-2005 2 final release.
7 revision history tda0161 12/12 i nformation furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the con sequence s o f use of such information nor for any infringement of patents or other rights of third parties which may result from its use. n o license is grante d b y implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicatio n are subje ct t o change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics produ cts are n ot a uthorized for use as critical components in life support devices or systems without express written approval of stmicroelectron ics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2005 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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