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CKSR series
Application information
Filtering and decoupling
Supply voltage V C
The fluxgate oscillator draws current pulses of up to 30 mA at
a rate of ca. 900 kHz. Significant 900 kHz voltage ripple on
V C can indicate a power supply with high impedance. At these
frequencies the power supply rejection ratio is low, and the rip-
ple may appear on the transducer output V OUT and reference
V REF . The transducer has internal decoupling capacitors, but in
the case of a power supply with high impedance, it is advised
to provide local decoupling (100 nF or more, located close to
the transducer)
Output V OUT
The output V OUT has a very low output impedance of
typically 2 Ohms; it can drive 100 pF directly. Adding series
Rf = 100 Ohms allows much larger capacitive loads. Empirical
evaluation may be necessary to obtain optimum results.
The minimum load resistance on V OUT is 1 kOhm.
Total Primary Resistance
The primary resistance is 0.72 m ? per conductor
In the following table, examples of primary resistance
according to the number of primary turns
Reference V REF
Ripple present on the reference output can be filtered with a
low value of capacitance because of the internal 680 Ohm
series resistance. The maximum filter capacitance value is
1 μF
Number of
primary turns
Primary
resistance
R P [m W ]
Recommended
connections
9
8
7
6
OUT
1
0.18
IN
2
9
3
8
4
7
5
6 OUT
2
0.72
IN
2
9
3
8
4
7
5
6 OUT
4
2.88
IN
2
3
4
5
Page 14/18
12October2012/version 8
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
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