LTC1040
Dual Micropower
Comparator
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FEATURES
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DESCRIPTIO
Micropower
1.5µW (1 Sample/Second)
Power Supply Flexibility
Single Supply 2.8V to 16V
Split Supply ±2.8V to ±8V
Guaranteed Max Offset 0.75mV
Guaranteed Max Tracking Error Between Input
Pairs ± 0.1%
Input Common Mode Range to Both Supply Rails
TTL/CMOS Compatible with ±5V or Single 5V
Supply
Input Errors are Stable with Time and Temperature
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In addition to switching power ON, a switched output is
provided to drive external loads during the comparator’s
active time. This allows not only low comparator power,
but low total system power.
Sampling is controlled by an external strobe input or an
internal oscillator. The oscillator frequency is set by an
external RC network.
APPLICATIO S
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The LTC®1040 is a monolithic CMOS dual comparator
manufactured using Linear Technology’s enhanced
LTCMOSTM silicon gate process. Extremely low operating
power levels are achieved by internally switching the
comparator ON for short periods of time. The CMOS
output logic holds the output information continuously
while not consuming any power.
Battery-Powered Systems
Remote Sensing
Window Comparator
BANG-BANG Controllers
Each comparator has a unique input structure, giving two
differential inputs. The output of the comparator will be
high if the algebraic sum of the inputs is positive and low
if the algebraic sum of the inputs is negative.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS™ is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATIO
Window Comparator with Symmetric Window Limits
Typical LTC1040 Supply Current
vs Sampling Frequency
1000
VIN
+
–
+
–
COMP A
A OUT = “1” WHEN
VIN > VC + ∆
A + B = “1” WHEN
VC – ∆ ≤ VIN ≤ VC + ∆
VC
∆
+
–
+
–
COMP B
B OUT = “1” WHEN
VIN < VC – ∆
SUPPLY CURRENT, IS (µA)
LTC1040
VS = ±5V
100
10
1
0.10
0.01
0.1
REXT = 10M
EXTERNALLY STROBED
1
100
1,000
10
SAMPLING FREQUENCY, fS (Hz)
10,000
LTC1040 • TA02
LTC1040 • TA01
1040fa
1
