STMICROELECTRONICS TDA0161DP

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
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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
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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-
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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.)
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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
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