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LMV821 датащи(PDF) 15 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LMV821
подробное описание детали  Low Voltage, Low Power, R-to-R Output, 5 MHz Op Amps
PDF  24 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMV821 датащи(HTML) 15 Page - National Semiconductor (TI)

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2.5 Tri-level Voltage Detector
The tri-level voltage detector of
Figure 13 provides a type of
window comparator function. It detects three different input
voltage ranges: Min-range, Mid-range, and Max-range. The
output voltage (V
O)isatVCC for the Min-range. VO is
clamped at GND for the Mid-range. For the Max-range, V
O is
at V
ee. Figure 14 shows a VO vs. VI oscilloscope photo per
the circuit of
Figure 13.
Its operation is as follows: V
I deviating from GND, causes
the diode bridge to absorb I
IN to maintain a clamped condi-
tion (V
O= 0V). Eventually, IIN reaches the bias limit of the di-
ode bridge. When this limit is reached, the clamping effect
stops and the op amp responds open loop. The design equa-
tion directly preceding
Figure 14, shows how to determine
the clamping range. The equation solves for the input volt-
age band on each side GND. The mid-range is twice this
voltage band.
DS100128-89
DS100128-34
FIGURE 13. Tri-level Voltage Detector
OV
-VIN
+V
IN
OV
|
∆v
|
∆v
|
DS100128-35
FIGURE 14. X, Y Oscilloscope Trace showing V
OUT vs
V
IN per the Circuit of Figure 13
www.national.com
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