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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)：12mV @ 5V
- Current - Input Bias (Max)：-
- Current - Output (Typ)：-
- Current - Quiescent (Max)：710nA
- CMRR, PSRR (Typ)：80dB CMRR, 80dB PSRR
- Propagation Delay (Max)：60µs
- 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 LTC1540IDD#PBF is a nanopower comparator with an integrated reference, housed in an 8-lead (3mm × 3mm) plastic DFN package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supplies. The device features a typical supply current of 0.68µA and a propagation delay of 60µs with 10mV overdrive. It includes a 1.182V ±2% reference output capable of driving up to 0.01µF without oscillation. The CMOS outputs are TTL/CMOS compatible and can source up to 40mA continuously.
Feature Summary
- Ultralow quiescent current consumption for battery-powered applications
- Integrated 1.182V reference output that drives bypass capacitors without oscillation
- Programmable hysteresis via external resistors connected to the HYST pin
- Glitch-free switching with no crowbar current during logic state transitions
Applications
- Battery-powered system monitoring
- Threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific suffix IDD#PBF corresponds to the industrial temperature range (-40°C to 85°C) and the 8-lead DFN package format. Confirm lead-free finish compliance and check for tape and reel availability if automated assembly is required. Ensure the ordering code matches the exact package dimensions and thermal characteristics specified for the DD variant.
Selection Notes
Select this component when ultra-low power consumption is critical alongside precise threshold detection. The built-in reference eliminates the need for external voltage references, reducing board space. Consider the 60µs propagation delay for timing-sensitive designs. The wide input common-mode range extending to the negative supply simplifies interface requirements for low-voltage signals.
Part Context
This part belongs to the LTC1540 family of nanopower comparators. It shares pin compatibility with devices like the LTC1440 and MAX921. The IDD suffix specifically denotes the industrial temperature grade within the DFN package option, distinguishing it from commercial grades or alternative packages like SO-8 and MSOP.
Replacement Considerations
LTC1540CDD#PBF
FAQ
Can the reference output drive large capacitive loads?
The reference can drive up to 0.01µF directly without oscillation. For larger capacitance values up to 10µF, a series damping resistor must be inserted between the REF pin and the capacitor.
What is the maximum hysteresis voltage band?
The maximum voltage allowed between the REF and HYST pins is 50mV, which produces a maximum hysteresis voltage band of 100mV.
