LTC1541IS8(V2) データシートの表示（PDF） - Linear Technology

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LTC1541IS8
(Rev.:V2)

Micropower Op Amp, Comparator and Reference

Linear Technology 

LTC1541

BLOCK DIAGRAMS

LTC1541

1 AMPOUT

OP AMP

2 AMPIN–

3 AMPIN+

4 VSS

×1

COMP

VCC 8

COMPOUT 7

REF 6

COMPIN+ 5

LTC1541 • BD

APPLICATIONS INFORMATION

The LTC1541 is a combination of a micropower op amp,

comparator and 1.2V ±1% reference in an 8-pin package.

The LTC1541 has the negative input of the comparator

internally connected to the reference output. The supply

voltage range is from 2.5V to 12.6V for single supply and

±1.25V to ±6.3V for dual supplies. The supply current is

a mere 5µA (typical) with a 5V single supply.

Op Amp

The op amp is internally compensated to be unity-gain

stable, with typical GBW at 12kHz and slew rate of 8V/ms.

The output can drive a capacitive load of up to 1000pF and

swings from rail-to-rail. The input range is from the

negative rail to within 1.3V of the positive rail. The input

bias current is less than 1nA maximum at the extended

temperature range.

8

LTC1541 VCC

6 REF ×1

R1

C1

GND

4

LTC1541 • F01

Figure 1. Damping the Reference Output

Comparator

The comparator has a high impedance differential input

stage with a common input range from the negative rail to

within 1.3V of the positive rail. The CMOS output stage can

swing from rail-to-rail and source up to 20mA continu-

ously. The output stage has been designed to eliminate the

power supply glitches that normally occur when the out-

put changes logic state. In addition, an internal hysteresis

(±3mV) ensures clean output switching even with slow

moving input signals. The negative input is internally

connected to the reference for the LTC1541.

Reference

The internal bandgap reference has an output voltage of

1.2V ±1% in the industrial grade temperature range. The

output can source up to 2mA and sink up to 20µA with a

5V supply. The output can drive a bypass capacitor of up

to 0.01µF without oscillation and by inserting a series

resistor, capacitance values up to 100µF can be used

(Figure 1). Figure 2 shows the resistor value required for

different capacitor values to achieve critical damping.

Bypassing the reference can help prevent false tripping of

the comparator by preventing glitches on VCC or reference

load transients from disturbing the reference output volt-

age. Figures 3a and 3b show the bypass reference output

with a square wave applied to the VCC pin while resistor R1

damps the reference response. Note that the comparator

output doesn’t trip.

6

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