參數(shù)資料
型號(hào)： LMC6762BIN
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull Output
中文描述： DUAL COMPARATOR, 15000 uV OFFSET-MAX, 4000 ns RESPONSE TIME, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 8/13頁(yè)
文件大小： 317K
代理商： LMC6762BIN
Application Hints
1.0 Input Common-Mode Voltage Range
At supply voltages of 2.7V, 5V and 15V, the LMC6762 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
shift of the comparator over the
common-mode range of the device. A CMRR (
V
/
V
)
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 LMC6762 ideal for sensor applications. The
LMC6762 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
LMC6762 can compare the sensor signal with an appropri-
ately small reference voltage. This reference voltage can be
close to ground or the positive supply rail.
2.0 Low Voltage Operation
Comparators are the common devices by which analog sig-
nals interface with digital circuits. The LMC6762 has been
designed to operate at supply voltages of 2.7V without sac-
rificing performance to meet the demands of 3V digital sys-
tems.
At supply voltages of 2.7V, the common-mode voltage range
extends 200 mV (guaranteed) below the negative supply.
This feature, in addition to the comparator being able to
sense signals near the positive rail, is extremely useful in low
voltage applications.
At V
+
= 2.7V, propagation delays are t
= 4 μs and t
=
4 μs with overdrives of 100 mV. Please refer to the perfor-
mance curves for more extensive characterization.
3.0 Shoot-Through Current
The shoot-through current is defined as the current surge,
above the quiescent supply current, between the positive
and negative supplies of a device. The current surge occurs
when the output of the device switches states. This transient
switching current results in glitches in the supply voltage.
Usually, glitches in the supply lines are compensated by by-
pass capacitors. When the switching currents are minimal,
the values of the bypass capacitors can be reduced
considerably.
DS012320-5
FIGURE 1. An Input Signal Exceeds the LMC6762
Power Supply Voltages with No Output Phase
Inversion
DS012320-6
FIGURE 2. Even at Low-Supply Voltage of 2.7V, an
Input Signal which Exceeds the Supply Voltages
Produces No Phase Inversion at the Output
DS012320-7
FIGURE 3. LMC6762 Circuit for Measurement
of the Shoot-Through Current
www.national.com
8
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