LMV822MM National Semiconductor, LMV822MM Datasheet - Page 15

• Manufacturer Part Number: LMV822MM
• Description: Operational Amplifier (Op-Amp) IC
• Manufacturer: National Semiconductor

Specifications of LMV822MM

• No. Of Amplifiers: 1
• Bandwidth: 5MHz
• Slew Rate: 1.4V/µs
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Single Supply Voltage Min (+v): 2.7V
• Input Offset Voltage Max: 3.5mV
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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
clamped at GND for the Mid-range. For the Max-range, V
at V
the circuit of Figure 13 .
Its operation is as follows: V
the diode bridge to absorb I
tion (V
ode bridge. When this limit is reached, the clamping effect
ee
. Figure 14 shows a V
O
= 0V). Eventually, I
FIGURE 13. Tri-level Voltage Detector
O
) is at V
IN
IN
O
reaches the bias limit of the di-
I
CC
to maintain a clamped condi-
vs. V
deviating from GND, causes
for the Min-range. V
I
oscilloscope photo per
DS100128-34
O
O
is
is
15
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.
FIGURE 14. X, Y Oscilloscope Trace showing V
OV
V
IN
-V IN
per the Circuit of Figure 13
|
v
OV
|
DS100128-89
v
|
+V IN
DS100128-35
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OUT
vs