LM7341 datasheet(17/20 Pages) NSC

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NON-INVERTING COMPARATOR WITH HYSTERESIS

A non-inverting comparator with hysteresis requires a two re-

sistor network, and a voltage reference (V

REF) at the inverting

input. When V

IN is low, the output is also low. For the output

to switch from low to high, V

IN must rise up to VIN1 where

IN1 is calculated by

IN1 = R1*(VREF/R2) + VREF

When V

IN is high, the output is also high, to make the com-

parator switch back to it's low state, V

IN must equal VREF

before V

A will again equal VREF . VIN can be calculated by

IN2 = (VREF (R1+ R2) - VCCR1)/R2

The hysteresis of this circuit is the difference between V

IN1

and V

IN2.

Delta V

IN = VCCR1/R2

For example to achieve 50 mV of hysteresis when V

CC = 30V

set R

1 = 20Ω and R2 = 12.1 kΩ.

20206057

20206058

FIGURE 4. Non-Inverting Comparator with Hysteresis

OTHER SOT-23 AMPLIFIERS

The LM7321 is a rail-to-rail input and output amplifier that can

tolerate unlimited capacitive load. It works from 2.7V to ±15V

and across the −40°C to 125°C temperature range. It has 20

MHz gain-bandwidth, and is available in both 5-Pin SOT-23

and 8-Pin SOIC packages.

The LM6211 is a 20 MHz part with CMOS input, which runs

on 5V to 24V single supplies. It has rail-to-rail output and low

noise.

The LMP7701 is a rail-to-rail input and output precision part

with an input voltage offset under 220 microvolts and low

noise. It has 2.5 MHz bandwidth and works on 2.7V to 12V

supplies.

SMALLER SC70 AMPLIFIERS

The LMV641 is a 10 MHz amplifier which uses only 140 micro

amps of supply current. The input voltage offset is less than

0.5 mV.

The LMV851 is an 8 MHz amplifier which uses only 0.4 mA

supply current, and is available in the smaller SC70 package.

The LMV851 also resists Electro Magnetic Interference (EMI)

from mobile phones and similar high frequency sources. It

works on 2.7V to 5.5 V supplies.

Detailed information on these and a wide range of other parts

can be found at www.national.com.

LM7341 Datasheet(PDF) 17 Page - National Semiconductor (TI)

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