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Product Detailed Parameters
- Description：IC COMPARATOR 1 W/VOLT REF 8DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- 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 LTC1440CDD#PBF is a micropower 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 programmable hysteresis via the HYST pin and CMOS outputs capable of sourcing up to 40mA. Typical supply current is 2.1µA at 5V. Propagation delay is 12µs with 10mV overdrive. Input common mode range extends from V– to V+ – 1.3V.
Feature Summary
- Built-in 1.182V bandgap reference output
- Programmable hysteresis capability
- Glitch-free CMOS output stage
- Wide input common mode range
Applications
- Battery-powered system monitoring
- Threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific C-grade temperature rating (0°C to 70°C) against application requirements. Confirm the DD package dimensions match the PCB footprint. Ensure the #PBF suffix indicates lead-free compliance for assembly processes. Cross-reference the manufacturer part number with authorized distributors to validate authenticity.
Selection Notes
Select this component when ultralow quiescent current is critical alongside integrated reference functionality. The single-channel configuration suits space-constrained designs requiring precise voltage threshold detection. Consider the DFN package for thermal management and board space optimization compared to larger plastic packages.
Part Context
This part belongs to the LTC1440/LTC1441/LTC1442 family of micropower comparators. While the LTC1441 offers dual channels without reference and the LTC1442 provides dual channels with reference, the LTC1440 specifically integrates a single comparator channel with a dedicated reference output and hysteresis control pin.
Replacement Considerations
LTC1440IMS8#TRPBF
FAQ
How is hysteresis programmed on the LTC1440?
Hysteresis is programmed by connecting resistors between the REF and HYST pins and from HYST to V–. The maximum hysteresis voltage band is 100mV.
Can the reference output drive capacitive loads?
Yes, the reference can drive a bypass capacitor of up to 0.01µF directly without oscillation. Larger capacitance values require a series damping resistor.
