ST TDA0161 User Manual

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.

OUTPUTCURRENT : 10mA

.

OSCILLATORFREQUENCY : 10 MHz

.

SUPPLYVOLTAGE : + 4 TO + 35 V

TDA0161

PROXIMITYDETECTORS

Minidip

ORDERING NUMBER : TDA0161DP

DESCRIPTION

These monolithic integrated circuits are designed
for metallic body detection by detecting the vari­ations in highfrequencyEddy current losses. With
an external tuned circuit they act as oscillators.
Output signal level is altered by an approaching
metallicobject.

Output signal is determined by supply current
changes. Independentof supply voltage, this cur­rentis highor lowaccordingto the presenceor the
absenceof a closemetallicobject.

SCHEMATICDIAGRAM

SO8

ORDERING NUMBER : TDA0161FP

PIN CONNECTION (top view)

April 1993

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TDA0161

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Value Unit

V

T

Supply Voltage 35 V

CC

T

Junction Temperature +150

j

Storage Temperature Range –55 to +150

stg

o

C

o

C

ELECTRICAL CHARACTERISTICS

TDA0161DP -40
TDA0161FP -40

o

C<T

o

C<T

amb
amb

< +100oC
< +100oC

Ptot <150mW,unless otherwisespecified

Symbol Parameter Min. Typ. Max. Unit

V

I

I

f

∆I

R

H

* 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.

OPERATINGMODE

Between terminals A and E, the integratedcircuit
actslike anegativeresistanceequaltotheexternal
resistor R1 connectedbetween terminalsB andH.

The oscillation stops when loss resistance Rp of
tuned circuit becomes smaller than R1. Then, the

Supply Voltage 4 35 V

CC

Reverse VoltageLimitation (I
Supply Current,Close Target (T

CC

+4V < V
Supply Current,Remote Target

CC

+4V < V

< +35V TDA0161 8 10 12

CC

< +35V TDA0161 1

CC

= -100 mA) TDA0161 1 V

CC

= +25oC)

amb

Supply Current Transition Time

C3 = 0
C3 ≠ 0

Oscillator Tuning Frequency 10 MHz

osc

f

Output Frequency (C3 = 0) 0 10 kHz

O

Output Current Ripple - C3 = 0, C2 (pF)> 150/f

CC

Negative Resistance onTerminals A and E

n

yst

4kΩ < R1 < 50kΩ,f

Hysteresis at Detection Point C2 (Pf) > 150/f

< 3 MHz 0.9 R1 R1 1.1 R1

osc

(MHz) 20 µA

osc

(MHz) 0.5 5 %

osc

supplycurrent will be I

1

(100 x C3 (nF))

=10mA (pins G and D).

CC

The oscillationsustainswhenlossresistanceRpof
tuned circuit becomes higher than R1. Then, the
supplycurrent will be I

1mA(pins G and D).

CC

Eddy currentsinducedbycoilL1ina metallicbody,
determineloss resistance Rp.

mA

mA

µs

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TYPICALAPPLICATIONS

TDA0161

Detection Range (*) L1 (µH) C1 (pF)

f

osc

(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

COILCHARACTERISTICS

Core Coil Former Wire** Number of Turns

1 Cofelec

432 FP 9 x 5 SE

2 Cofelec

432 FP 14 x 8 SE

3 Cofelec

432 FP 26 x 16 SE

** The above results are obtained with single wire coil.When using Litz wire instead of single wire, the parallel resistance of thecoil be­comes higherand the value of R1 may be increased,resulting in bettersensitivity.

1/2
CAR 091 - 2

1/2
CAR 142 - 2

1/2
CAR 262 - 2

THOMSON Fils et Câbles
Thomrex 14
(14/100mm)

THOMSON Fils et Câbles
Thomrex 14
(14/100mm)

THOMSON Fils et Câbles
Thomrex 14
(14/100mm)

40

100

200

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TDA0161

MINIDIPPACKAGE MECHANICAL DATA

DIM.

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

mm inch

4/6

SO8 PACKAGEMECHANICAL DATA

TDA0161

DIM.

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.)

mm inch

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TDA0161

Information furnishedis believed to be accurateand reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of useof such information nor for any infringement of patents or other rights of third parties which may result from itsuse. No
license is granted by implicationor otherwise under any patentor 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 productsarenot authorized for useas critical components in lifesupport devices orsystems withoutexpress
written approval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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