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P3190 Datasheet(PDF) 3 Page - ETAL Group

Part # P3190
Description  MICROPROFILE PICK-OFF TRANSFORMER
Download  5 Pages
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Manufacturer  ETAL [ETAL Group]
Direct Link  http://www.etalgroup.com
Logo ETAL - ETAL Group

P3190 Datasheet(HTML) 3 Page - ETAL Group

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P3190
ETALDOC 725/12
Page 3 of 5
October 2007
Reference Circuit
In practice, the 47k
Ω load can be increased
without limit. The DC blocking capacitor should
be maintained within the range 0.22µF to 0.33µF
to obtain a flat frequency response and input
impedance to specification.
40k
Ω APPLICATION CIRCUITS
For applications requiring impedance greater than 40kΩ for parallel-connected Terminal Equipment
(e.g. ETSI TS 103 021, ≥40kΩ, 200Hz – 4.3kHz) the following circuits may be helpful.
At the expense of a small loss, the circuit in
Fig. 3 provides an impedance exceeding 40kΩ
from DC upwards.
Due to the finite primary inductance of the
P3190, the circuit of Fig. 3 suffers from low
frequency rolloff below 500Hz. At the expense of
around 6dBV loss, the circuit of Fig. 4 provides a
relatively flat response from 300Hz to 4kHz.
The load resistance, RLoad, across which the
output voltage appears, should be a minimum of
470kΩ, and can be increased without limit.
Fig 3
39k
47n
270k
P3190
Z > 40k
in
Ω
Fig 4
39k
68n
RLoad
P3190
Z > 40k
in
Ω
39k
6.8n
Vout
Fig 2
47k
0.27µF
Zin


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