LTC1040 Dual Micropower Comparator UFEATURESDESCRIPTIO ■ Micropower The LTC®1040 is a monolithic CMOS dual comparator 1.5µW (1 Sample/Second) manufactured using Linear Technology’s enhanced ■ Power Supply Flexibility LTCMOSTM silicon gate process. Extremely low operating Single Supply 2.8V to 16V power levels are achieved by internally switching the Split Supply ±2.8V to ±8V comparator ON for short periods of time. The CMOS ■ Guaranteed Max Offset 0.75mV output logic holds the output information continuously ■ Guaranteed Max Tracking Error Between Input while not consuming any power. Pairs ± 0.1% In addition to switching power ON, a switched output is ■ Input Common Mode Range to Both Supply Rails provided to drive external loads during the comparator’s ■ TTL/CMOS Compatible with ±5V or Single 5V active time. This allows not only low comparator power, Supply but low total system power. ■ Input Errors are Stable with Time and Temperature Sampling is controlled by an external strobe input or an U internal oscillator. The oscillator frequency is set by an APPLICATIO S external RC network. ■ Battery-Powered Systems Each comparator has a unique input structure, giving two ■ Remote Sensing differential inputs. The output of the comparator will be ■ Window Comparator high if the algebraic sum of the inputs is positive and low ■ BANG-BANG Controllers 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. UTYPICAL APPLICATIOWindow Comparator with Symmetric Window LimitsTypical LTC1040 Supply Currentvs Sampling Frequency 1000 VS = ±5V LTC1040 V 100 IN + – µA) AOUT = “1” WHEN ( + COMP A S VIN > VC + ∆ – 10 A + B = “1” WHEN 1 R V EXT = 10M C – ∆ ≤ VIN ≤ VC + ∆ VC + SUPPLY CURRENT, I – 0.10 EXTERNALLY STROBED BOUT = “1” WHEN + COMP B VIN < VC – ∆ ∆ – 0.010.1 1 10 100 1,000 10,000 SAMPLING FREQUENCY, fS (Hz) LTC1040 • TA02 LTC1040 • TA01 1040fa 1
