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Product Detailed Parameters
- Description：IC COMPARATOR 2 GEN PUR 8DFN
- Series：UltraFast™
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：General Purpose
- Number of Elements：2
- Output Type：CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±)：2.7V ~ 6V
- Voltage - Input Offset (Max)：3mV @ 5V
- Current - Input Bias (Max)：6µA @ 5V
- Current - Output (Typ)：20mA
- Current - Quiescent (Max)：7mA
- CMRR, PSRR (Typ)：70dB CMRR, 80dB PSRR
- Propagation Delay (Max)：10ns
- Hysteresis：7mV
- 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 LT1720CDD#PBF is a dual, ultrafast analog comparator from Analog Devices Inc., housed in an 8-lead DFN package. It operates on a single supply voltage ranging from 2.7V to 6V. The device features a propagation delay of 4.5ns at 20mV overdrive and draws 4mA per comparator. Inputs extend 100mV below the negative rail, while outputs provide rail-to-rail swing compatible with TTL and CMOS logic levels.
Feature Summary
- Ultrafast response time optimized for high-speed differential line receiving and sampling circuits
- Rail-to-rail output stage directly interfaces with standard TTL and CMOS logic families
- Internal hysteresis ensures stable operation when processing slow-moving input signals
- Input common-mode range extends 100mV below the negative ground rail
Applications
- Crystal oscillator circuits
- High-speed differential line receivers
- Window comparators and threshold detectors
- Zero-crossing detectors
- Pulse stretchers
Procurement Notes
Verify the specific C-grade temperature rating (0°C to 70°C) against system requirements. Confirm the 8-lead DFN footprint matches the PCB layout. Ensure power supply decoupling meets datasheet recommendations to maintain signal integrity during high-speed switching operations.
Selection Notes
Select this component for applications requiring fast switching speeds within a low-voltage single-supply environment. Consider the internal hysteresis for noise immunity without external components. Evaluate the DFN package size constraints relative to available board space and thermal dissipation capabilities.
Part Context
This part belongs to the LT1720/LT1721 family of UltraFast comparators designed for space-limited, low-power systems. The LT1720 variant provides two independent channels, whereas the LT1721 offers four channels in larger packages. Both share identical electrical characteristics and pinout optimizations for minimizing parasitic effects.
Replacement Considerations
LT1720IDD#PBF: Identical electrical specifications but rated for industrial temperature range (-40°C to 85°C).
FAQ
How does the internal hysteresis affect the input trip points?
The device includes specified internal hysteresis limits that define distinct positive and negative trip points, preventing oscillation with slow-moving signals.
What is the behavior if inputs exceed the common-mode range?
If both inputs fall below the negative limit, phase reversal protection prevents false inversion up to -400mV common mode, though offset and hysteresis may increase significantly.
