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Analog Devices Inc. LT1720IDD#PBF
- Part No.:
- LT1720IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1720IDD#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:515
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Product details
Overview
LT1720IDD#PBF from Analog Devices (formerly Linear Technology) is a dual, ultrafast rail-to-rail output comparator optimized for single-supply operation across 2.7V–6V. It delivers 4.5ns propagation delay at 20mV overdrive, 4mA per comparator supply current, and input common-mode range extending 100mV below ground to 1.2V below VCC - enabling direct interface with TTL/CMOS logic in high-speed threshold detection circuits.
For engineers reviewing the LT1720IDD#PBF datasheet, LT1720IDD#PBF pinout, LT1720IDD#PBF application, or LT1720IDD#PBF equivalent, this device is selected for precision timing-critical functions including crystal oscillator buffering, window comparators, zero-crossing detection, and high-speed sampling where sub-5ns response and low-power single-supply compatibility are mandatory.
Technical Context
The LT1720IDD#PBF employs a complementary bipolar input stage with internal 3.5mV hysteresis, enabling stable operation with slow-moving inputs without external feedback. Its differential architecture supports independent comparator channels with matched propagation delay skew ≤1.5ns and differential delay ≤1.0ns.
Designed for minimal parasitic coupling, the pinout isolates sensitive inverting inputs from outputs using power rails as shields. The device operates reliably across –40°C to +85°C and maintains rail-to-rail output swing (VOH = VCC – 0.4V, VOL = 0.4V) into 4mA/10mA loads while exhibiting 70dB CMRR and 80dB PSRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns at 20mV overdrive - enables <220MHz toggle rate in clean signal paths |
| Supply Voltage Range | 2.7V to 6V - supports direct integration with 3.3V and 5V system rails |
| Input Common-Mode Range | –0.1V to VCC – 1.2V - allows ground-referenced sensing and level-shifted inputs |
| Output Drive | Rail-to-rail swing (VOH/VOL) - eliminates level-shifting components when driving TTL/CMOS |
| Quiescent Current | 4mA per comparator at 5V - balances speed and power for battery-sensitive applications |
| Hysteresis Voltage | Typical 3.5mV - suppresses chatter on noisy or slowly varying signals without external components |
| Input Offset Voltage | 3.0mV max - ensures accurate threshold detection within ±1.5mV trip point tolerance |
Pinout & Package
LT1720IDD#PBF uses an 8-lead (3mm × 3mm) plastic DFN package with underside thermal pad internally connected to GND. This low-profile (0.75mm height), fine-pitch leadless package supports high-density PCB layouts and enhanced thermal dissipation in space-constrained systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 1) | Noninverting input of Comparator A | Accepts reference or signal input; designed for minimal capacitive coupling to adjacent pins |
| –IN A (Pin 2) | Inverting input of Comparator A | High-impedance node placed away from outputs to reduce feedback-induced oscillation |
| –IN B (Pin 3) | Inverting input of Comparator B | Electrically isolated from Comparator A inputs; supports independent dual-threshold detection |
| +IN B (Pin 4) | Noninverting input of Comparator B | Enables differential or single-ended configuration per channel without cross-talk |
| GND (Pin 5) | Ground reference | Primary ground connection; underside metal pad must be soldered for thermal and EMI performance |
| OUT B (Pin 6) | Output of Comparator B | Rail-to-rail CMOS/TTL-compatible output; capable of sourcing 4mA/sinking 10mA |
| OUT A (Pin 7) | Output of Comparator A | Matched timing to OUT B (skew ≤1.5ns); supports synchronous dual-edge sampling |
| VCC (Pin 8) | Positive supply voltage | Must be bypassed with 10nF ceramic + 2.2μF tantalum; shared supply for both comparators |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast 4.5ns propagation delay | Enables real-time response in >200MHz clock/data recovery and pulse-stretching circuits |
| Internal 3.5mV hysteresis | Eliminates need for external positive feedback resistors in noise-prone industrial environments |
| Rail-to-rail output drive | Direct interfacing to 3.3V/5V logic families without level translators or pull-up resistors |
| –40°C to +85°C operating range | Validated performance for automotive body control modules and industrial PLC I/O stages |
| DFN thermal pad (GND-connected) | Reduces θJA to 160°C/W - sustains continuous operation under 4mA/channel load at 85°C ambient |
Applications
| Crystal Oscillator Buffering | Window Comparator |
|---|---|
|
Use Scenario: Amplifying and squaring low-level AT-cut crystal oscillator outputs (1MHz–10MHz) into clean digital clocks. IC Role / Device Role / Timing Role: High-speed comparator acting as a gain-controlled limiter with rail-to-rail output swing. Use Value: Maintains <15ps RMS jitter at 20MHz while rejecting amplitude noise via internal hysteresis - critical for PLL reference integrity. |
Use Scenario: Detecting whether an analog sensor voltage lies between two fixed thresholds (e.g., battery voltage monitoring). IC Role / Device Role / Timing Role: Dual comparator implementing upper/lower trip points with matched propagation delay. Use Value: Differential delay ≤1.0ns ensures simultaneous decision edges - prevents metastability in safety-critical window violation flags. |
| Zero-Crossing Detection | High-Speed Sampling Trigger |
|
Use Scenario: Identifying AC line voltage polarity transitions in motor control inverters and energy metering ICs. IC Role / Device Role / Timing Role: Precision comparator with extended common-mode range accepting ±100mV input near ground. Use Value: Input range down to –0.1V enables direct connection to shunt-based current sensors without level-shifting op-amps. |
Use Scenario: Generating precise strobe pulses for ADC sampling in radar IF receivers and ultrasound beamforming. IC Role / Device Role / Timing Role: Low-jitter edge detector triggering sample-hold circuits with sub-nanosecond timing uncertainty. Use Value: 4.5ns delay + 11ps RMS jitter ensures <±0.5 LSB timing error at 100MSPS sampling rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX961ESA+ | Slower 7.5ns delay; higher 6.5mA supply current; no internal hysteresis | Requires external hysteresis network; less suitable for noisy sensor inputs | Select when lower cost outweighs need for sub-5ns timing and integrated hysteresis |
| ADCMP600BRMZ | Faster 2.8ns delay but narrower 2.7V–5.5V supply range; 12mA supply current | Better for RF sampling; less optimal for 6V industrial bus interfaces | Select when absolute minimum propagation delay is required and 6V operation is not needed |
Compared with MAX961ESA+ and ADCMP600BRMZ, the LT1720IDD#PBF provides the best balance of speed (4.5ns), power (4mA), integrated hysteresis, and 6V supply tolerance - making it preferred for robust industrial timing and sensor interface designs where layout simplicity and thermal efficiency matter.
Availability
LT1720IDD#PBF is available at Aetrix Electronics and suitable for crystal oscillator circuits, window comparators, zero-crossing detectors, and high-speed sampling triggers requiring stable component supply across automotive, industrial, and test equipment programs.
Supply support for LT1720IDD#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, datasheet documentation, and long-term manufacturing commitment for legacy Linear parts.
The LT1720 series was designed specifically for high-speed, low-voltage, single-supply comparator applications - targeting precision timing, sensor signal conditioning, and digital interface bridging in space- and power-constrained systems.
FAQ
What is the maximum operating temperature for LT1720IDD#PBF?
The LT1720IDD#PBF is rated for operation from –40°C to +85°C, matching the Industrial temperature grade (I Grade) specified in the Linear Technology datasheet. Its DFN package features a GND-connected thermal pad that maintains junction temperature within safe limits (TJMAX = 125°C) under typical 4mA/channel loading at 85°C ambient.
Does LT1720IDD#PBF require external hysteresis resistors?
No, the LT1720IDD#PBF includes internal hysteresis of 2.0mV to 7.0mV (typical 3.5mV), eliminating the need for external positive feedback networks in most noise-immune applications. External hysteresis can be added if greater threshold separation is required, leveraging the rail-to-rail output swing for predictable calculation.
Can LT1720IDD#PBF operate from a 3.3V supply?
Yes, the LT1720IDD#PBF supports supply voltages from 2.7V to 6V, making it fully compatible with standard 3.3V logic rails. At 3.3V, it delivers 4.5ns propagation delay (slightly increased vs. 5V), 3.5mA quiescent current per comparator, and rail-to-rail outputs swinging within 400mV of VCC and GND.
What is the input common-mode voltage range of LT1720IDD#PBF?
The LT1720IDD#PBF accepts input voltages from –0.1V (100mV below ground) to VCC – 1.2V. This extended range allows direct interfacing with ground-referenced sensors and level-shifted signals without clamping diodes or bias networks - a key advantage over standard comparators.
Is LT1720IDD#PBF pin-compatible with other LT1720 variants?
Yes, all LT1720 variants (e.g., LT1720CDD#PBF, LT1720IMS8#PBF) share identical pinouts in their respective packages. The LT1720IDD#PBF uses the 8-lead DFN package with pin 1 = +IN A, pin 2 = –IN A, pin 3 = –IN B, pin 4 = +IN B, pin 5 = GND, pin 6 = OUT B, pin 7 = OUT A, pin 8 = VCC.
LT1720IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-WFDFN Exposed Pad
- Series:
- UltraFast™
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 6V
- :
- 3mV @ 5V
- Voltage - Input Offset (Max):
- 6µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 7mA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 10ns
- Propagation Delay (Max):
- 7mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-DFN (3x3)
LT1720IDD#PBF FAQ
1.How can I place an order for LT1720IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1720IDD#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1720IDD#PBF reliable?
The price and inventory of LT1720IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1720IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1720IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1720IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1720IDD#PBF?
LT1720IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1720IDD#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1720IDD#PBF?
For technical support, including LT1720IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1720IDD#PBF requirements.
6.How does Aetrix verify that LT1720IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1720IDD#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1720IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1720IDD#PBF?
All LT1720IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1720IDD#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1720IDD#PBF part is unused and in its original packaging.
Return procedure for LT1720IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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