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LMC6772 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LMC6772
Description  Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output
Download  11 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMC6772 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics V+ = 5V, Single Supply, T
A = 25˚C unless otherwise
specified (Continued)
Application Hints
1.0 Input Common-Mode Voltage
Range
At supply voltages of 2.7V, 5V and 15V, the LMC6772 has an
input common-mode voltage range which exceeds both sup-
plies. As in the case of operational amplifiers, CMVR is de-
fined by the V
OS
shift of the comparator over the
common-mode range of the device. A CMRR (
∆V
OS/∆VCM)
of 75 dB (typical) implies a shift of < 1 mV over the entire
common-mode range of the device. The absolute maximum
input voltage at V
+ = 5V is 200 mV beyond either supply rail
at room temperature.
A wide input voltage range means that the comparator can
be used to sense signals close to ground and also to the
power supplies. This is an extremely useful feature in power
supply monitoring circuits.
An input common-mode voltage range that exceeds the sup-
plies, 20 fA input currents (typical), and a high input imped-
ance makes the LMC6772 ideal for sensor applications. The
LMC6772 can directly interface to sensors without the use of
amplifiers or bias circuits. In circuits with sensors which pro-
duce outputs in the tens to hundreds of millivolts, the
Response Time
for Overdrive (t
PHL)
DS012347-18
Response Time
for Overdrive (t
PLH)
DS012347-19
Response Time
for Overdrive (t
PHL)
DS012347-20
Response Time for
Overdrive (t
PLH)
DS012347-21
Response Time for
Overdrive (t
PHL)
DS012347-22
Response Time vs
Capacitive Load
DS012347-23
DS012347-24
FIGURE 1. An Input Signal Exceeds the LMC6772
Power Supply Voltages with No Output Phase
Inversion
www.national.com
6


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