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
1/6
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
2/6
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