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Product Detailed Parameters
- Description：IC COMPARATOR 1 W/VOLT REF 8DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Type：with Voltage Reference
- Number of Elements：1
- Output Type：CMOS, TTL
- Voltage - Supply, Single/Dual (±)：2V ~ 11V, ±1V ~ 5.5V
- Voltage - Input Offset (Max)：10mV @ 5V
- Current - Input Bias (Max)：-
- Current - Output (Typ)：40mA
- Current - Quiescent (Max)：4.4µA
- CMRR, PSRR (Typ)：80dB CMRR, 80dB PSRR
- Propagation Delay (Max)：15µs
- Hysteresis：50mV
- Operating Temperature：0°C ~ 70°C
- Package / Case：8-WFDFN Exposed Pad
- Mounting Type：Surface Mount
- Supplier Device Package：8-DFN (3x3)
- Grade：-
- Qualification：-
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Overview
The Analog Devices LTC1440CDD#TRPBF is an ultralow power single comparator with a built-in 1.182V reference, housed in an 8-lead DFN package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supply. The device features a typical supply current of 2.1µA at 5V and 2µA at 3V over the commercial temperature range (0°C to 70°C). It offers programmable hysteresis via the HYST pin, TTL/CMOS compatible outputs capable of sourcing up to 40mA, and eliminates crowbar switching currents during state transitions.
Feature Summary
- Integrates a precision 1.182V bandgap reference output that can drive bypass capacitors without oscillation
- Features adjustable hysteresis controlled by external resistors connected to the dedicated HYST pin
- Provides high-current CMOS outputs capable of sourcing up to 40mA while maintaining microampere quiescent operation
- Eliminates cross-conducting current during logic state changes to prevent power supply glitches
Applications
- Battery-powered system monitoring
- Micropower threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific C-grade temperature rating (0°C to 70°C) against application requirements, as I-grade variants exist for wider ranges. Confirm the DD package footprint matches the PCB layout, noting the exposed pad connection to V–. Ensure the #TRPBF suffix indicates lead-free tape and reel packaging consistent with assembly processes. Cross-reference the datasheet revision date to confirm electrical characteristics match design specifications.
Selection Notes
Select this component when ultralow quiescent current is critical alongside moderate propagation delay requirements. The LTC1440 is suitable for designs requiring a stable internal reference voltage without external components. Consider the DFN package size constraints and thermal dissipation capabilities. Verify that the input common mode range extending to within 1.3V of the positive supply meets signal conditioning needs.
Part Context
This part belongs to the LTC1440/LTC1441/LTC1442 family of micropower comparators. While the LTC1441 and LTC1442 are dual-channel devices, the LTC1440 is a single-channel unit featuring the unique HYST pin for hysteresis programming. It serves as a pin-compatible upgrade for legacy MAX921/922/923 comparators, offering improved power efficiency and integrated reference functionality in modern packages like the DFN.
Replacement Considerations
LTC1440CS8#TRPBF
FAQ
How is hysteresis programmed on the LTC1440?
Hysteresis is programmed using two resistors connected between the REF and HYST pins and from HYST to V–. The maximum hysteresis voltage band is 100mV, limited by a 50mV maximum voltage difference between the REF and HYST pins.
What is the input common mode voltage range?
The comparator inputs operate from the negative supply (V–) to within 1.3V of the positive supply (V+). Inputs can be forced 300mV beyond these limits without damage.
