LTC1541/LTC1542
Micropower Op Amp,
Comparator and Reference
FEATURES
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DESCRIPTION
The LTC
庐
1541/LTC1542 combine a micropower ampli-
fier, comparator and bandgap reference (LTC1541) in an
8-pin package. The part operates from a single 2.5V to
12.6V or dual
卤1.25V
to
卤6.3V
supply with a typical supply
current of 5碌A. Both the op amp and comparator feature
a common mode input voltage range that extends from the
negative supply to within 1.3V of the positive supply. The
op amp output stage swings from rail-to-rail. The
comparator鈥檚 inverting input is internally connected to the
reference output (LTC1541).
The reference output voltage is 1.2V
卤1%
over the
extended temperature range. The output can drive a
bypass capacitor of up to 0.01碌F without any oscillations.
It can also source up to 2mA and sink up to 20碌A.
The op amp is internally compensated to be unity-gain
stable with typical GBW at 12kHz and slew rate of 8V/ms.
The comparator has
卤3mV
of internal hysteresis to ensure
clean output switching, even with slow moving input
signals.
The LTC1541/LTC1542 are available in MSOP and SO-8
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Quiescent Current: 5
碌
A Typ
Outputs Swing Rail-to-Rail
Low Op Amp Offset Voltage: 700
碌
V Max
Reference Output Drives 0.01碌F Capacitor
Internal 1.2V
卤0.4%
Reference Output (LTC1541)
Low Input Bias Current: 1nA Max
Reference Output Can Source Up to 2mA
Internal
卤3mV
Comparator Hysteresis
Comparator and Op Amp Input Range
Includes Ground
Op Amp Capable of Driving Up to 1000pF Load
Unity-Gain Stable and 12kHz Bandwidth
2.5V to 12.6V Supply Voltage Range
Outputs
Daisy-Chained Control
Pin Compatible Upgrade for MAX951/MAX953
APPLICATIONS
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Battery- or Solar-Powered Systems
Automotive Keyless Entry
Low Frequency, Local Area Alarms/Detectors
Infrared Receivers for Remote Controls
Smoke Detectors and Safety Sensors
GSM Portable Phones
TYPICAL APPLICATION
Pilot Light Flame Detector with Low-Battery Lockout
V
IN
= 3.6V TO 9V
1N457
TYPE R
1k
100k
1N457
10M
3
10k
2.2碌F 1/2 LTC1541
2
2N3904
SCR LOAD
鈥?/div>
PERCENT OF UNITS (%)
鈥?/div>
+
+
8
1
OUTPUT HIGH = 鈥淥N鈥?/div>
OUTPUT LOW = 鈥淥FF鈥?/div>
I
CC
= 7碌A AT V
IN
= 5V
2M
5
1M
6
2M
1.2V INTERNAL
REFERENCE
1541/42 鈥?TA01
+
1/2 LTC1541
7
LOW BATTERY
鈥?/div>
10k
VN2222
U
U
U
Op Amp V
OS
Distribution,
V
CM
= 2.5V, SO-8 Package
Total of 839 Units
50
V
CC
= 5V
V
SS
= 0V
40
30
20
10
0
鈥?00
0
300
鈥?00
INPUT OFFSET VOLTAGE (碌V)
600
1541/42 TA02
1
LTC1542CMS8相关型号PDF文件下载
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