Datasheet

1
LTC1040
1040fa
■
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
The LTC
®
1040 is a monolithic CMOS dual comparator
manufactured using Linear Technology’s enhanced
LTCMOS
TM
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.
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.
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.
Window Comparator with Symmetric Window Limits
Dual Micropower
Comparator
Typical LTC1040 Supply Current
vs Sampling Frequency
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
■
Battery-Powered Systems
■
Remote Sensing
■
Window Comparator
■
BANG-BANG Controllers
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
C
A
OUT
= “1” WHEN
V
IN
> V
C
+ ∆
B
OUT
= “1” WHEN
V
IN
< V
C
– ∆
A + B = “1” WHEN
V
C
– ∆ ≤ V
IN
≤ V
C
+ ∆
V
IN
∆
LTC1040 • TA01
–
–
+
+
–
–
+
+
COMP A
COMP B
LTC1040
SAMPLING FREQUENCY, f
S
(Hz)
0.1
SUPPLY CURRENT, I
S
(µA)
10
100
1000
1,000
LTC1040 • TA02
1
0.10
0.01
1
10
100
10,000
V
S
= ±5V
R
EXT
= 10M
EXTERNALLY STROBED
TYPICAL APPLICATIO
U
LTCMOS™ is a trademark of Linear Technology Corporation.