SI25101B_e.DOC / Mrz-08
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When the reference signals REF+ and REF- are not used or not available, the related inputs of
the converter must be tied to a defined potential.
When you connect the REF- pin to V
m
with the REF+ pin open, the unit will generate a Z
impulse with every sine period.
When you connect the REF+ pin to V
m
with the REF- pin open, the unit will not generate a Z
impulse.
The sine-cosine signals on the input site are highly sensitive analogue
signals! Therefore it is mandatory to use proper screening. Use of cables
with pair wise twisted leads is highly recommended. The cable length should
not exceed 5 meters if possible.
With critical applications, a terminating impedance (approx. 470 ohms, and
where required a capacitor of 680 pF to 4.7 nF) connected between the
differential inputs may be helpful.
4.2.
RS 422 impulse output
B
/A
A
GND
/Z
Z
/B
1
2
3
4
5
9
8
6
7
