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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：-40°C ~ 85°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 LTC1440IDD#PBF is a micropower single comparator with an integrated 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. Supply current is typically 2.1µA at 5V. Input common mode range extends from V– to V+ – 1.3V. Propagation delay is 12µs with 10mV overdrive.
Feature Summary
- Integrated 1.182V bandgap reference output capable of driving bypass capacitors without oscillation
- Programmable hysteresis using external resistors connected to the dedicated HYST pin
- Glitch-free CMOS output stage that eliminates crowbar switching currents during logic transitions
- Wide input common mode range extending from the negative supply rail to within 1.3V of the positive supply
Applications
- Battery-powered system monitoring
- Micropower threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific IDD suffix indicates industrial temperature grade (-40°C to 85°C) and the #PBF designation confirms lead-free composition. Confirm the DD package variant matches the required 3mm x 3mm footprint for PCB layout compatibility. Ensure supply voltage constraints align with the specified 2V to 11V operational range.
Selection Notes
Select this component when ultralow quiescent current is critical alongside the need for a built-in voltage reference. The LTC1440 is suitable for applications requiring adjustable hysteresis and high output drive capability relative to its power consumption. Consider the DFN package size if space-constrained designs are necessary compared to standard SOIC or PDIP options.
Part Context
This part belongs to the LTC1440/LTC1441/LTC1442 family of micropower comparators. While the LTC1441 offers dual channels without a reference, and the LTC1442 provides dual channels with a reference, the LTC1440 specifically integrates a single comparator channel with the internal reference and hysteresis control features in the DFN package.
Replacement Considerations
Pin-compatible upgrades include the MAX921, MAX922, and MAX923 series. For quad-channel requirements, consider the LTC1443 or LTC1444 which share similar reference characteristics.
