LTC1040_09 Datasheet, PDF (1/12 Pages) Linear Technology – Dual Micropower Comparator

LTC1040
Dual Micropower
Comparator
FEATURES
s _Micropower
1.5µW (1 Sample/Second)
s _{Power Supply Flexibility}
Single Supply 2.8V to 16V
Split Supply ±2.8V to ±8V
s _{Guaranteed Max Offset 0.75mV}
s _{Guaranteed Max Tracking Error Between Input}
Pairs ± 0.1%
s _{Input Common Mode Range to Both Supply Rails}
s _{TTL/CMOS Compatible with ±5V or Single 5V}
Supply
s _{Input Errors are Stable with Time and Temperature}
U
APPLICATIO S
s _{Battery-Powered Systems}
s _{Remote Sensing}
s _{Window Comparator}
s _{BANG-BANG Controllers}
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS™ is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Window Comparator with Symmetric Window Limits
LTC1040
V_IN
+
–
+ ^{COMP A}
–
V_C
+
–
+ ^{COMP B}
∆
–
A_OUT = “1” WHEN
V_IN > V_C + ∆
A + B = “1” WHEN
V_C – ∆ ≤ V_IN ≤ V_C + ∆
B_OUT = “1” WHEN
V_IN < V_C – ∆
LTC1040 • TA01
Typical LTC1040 Supply Current
vs Sampling Frequency
1000
V_S = ±5V
100
10
1 R_EXT = 10M
0.10
EXTERNALLY STROBED
0.01
0.1
1
10 100 1,000 10,000
SAMPLING FREQUENCY, f_S (Hz)
LTC1040 • TA02
1040fa
1