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TDA0161DP Datasheet(PDF) 5 Page - STMicroelectronics

Part # TDA0161DP
Description  Proximity Detectors
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA0161DP Datasheet(HTML) 5 Page - STMicroelectronics

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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, ICC(close) = 10mA
(pins 1 and 6). The oscillation is sustained when Rp is higher than R1, and ICC(remote) = 1mA
(pins 1 and 6). Eddy currents induced by coil L1 in a metallic body determine the value of Rp.
Figure 2.
Electrical Scheme
Icc(close)
Icc(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



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