7
block
diagram
Note that this is an analog sample and hold
implementation where output voltages are
not processed by any digital converter. Even
though special low-leakage foil capacitors
are used to hold the sampled value, there will
be a noticeable droop after a longer period
of time.
Actually, you do not have to use a trigger-like
signal for the control inputs. Any analog sig-
nal will fire a new sample at the instant it
crosses the 1V threshold. Note, however, that
slowly changing signals may produce a series
of multiple samples due to the presence of
noise and multiple crossing of the threshold.
In order to prevent this, there is a small hys-
teresis near the threshold.
ACCESSORY
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fig. 7:
signal flow
LED
LED
LED
LED
IN 2
INV IN 2
IN 3
INV IN 3
IN 1
INV IN 1
IN 4
INV IN 4
±5V offset
±5V offset
signal
processor
OUT 2
OUT 3
OUT 1
OUT 1+2
OUT 3+4
OUT 4
