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Home > Products > Integrated Circuits (ICs) > Linear > Comparators

Analog Devices Inc. AD8611ARM-R2

Name: AD8611ARM-R2
Brand: Analog Devices Inc.
SKU: AD8611ARM-R2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD8611ARM-R2

Manufacturer:: Analog Devices Inc.

Category:: Comparators

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: AD8611ARM-R2.pdf

Description:: IC COMPARATOR 1 W/LATCH 8MSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD8611ARM-R2 from Analog Devices is a single-channel, ultrafast 4 ns propagation delay comparator with latch function and complementary outputs, operating from 3 V to 5 V single supply. It features 100 MHz input frequency capability, matched rising/falling edge delays (Δt_P ≤ 2.0 ns), and rail-to-rail input common-mode range down to GND - enabling precise timing detection in high-speed digital receivers and clock recovery circuits.

For engineers reviewing the AD8611ARM-R2 datasheet, AD8611ARM-R2 pinout, AD8611ARM-R2 application, or AD8611ARM-R2 equivalent, this page delivers verified technical context, package-specific pin functions, real-world timing performance data, latch timing constraints, and validated alternatives for high-speed comparator selection in industrial and communications systems.

Technical Context

The AD8611ARM-R2 uses a bipolar PNP input stage enabling −200 mV to +3.0 V input common-mode range on 5 V supply, with input bias current of −7 μA max over temperature. Its latch function requires V_CC ≥ 4.3 V to operate, with 0.5 ns setup/hold time and 3 ns minimum pulse width.

Propagation delay remains stable across temperature (4.0–5.0 ns at 25°C to 85°C) and load capacitance (<10 pF adds <0.5 ns delay), while differential delay matching ensures duty-cycle fidelity critical for clock recovery. Output swing reaches 2.4 V (VOH, I_OH = 3.2 mA) and 0.4 V (VOL, I_OL = 3.2 mA) on 5 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	4.0 ns typical at 5 V, 100 mV step with 100 mV overdrive - enables sub-5 ns timing-critical decisions in ADC sampling or line receiver applications.
Input Frequency	100 MHz maximum with <10 mV overdrive - supports direct comparison of high-speed serial data or clock signals without prescaling.
Supply Range	3 V to 5 V single supply - simplifies power architecture in portable or low-voltage embedded systems without dual-rail generation.
Input Common-Mode Range	0 V to 3.0 V at 5 V supply - includes ground reference, allowing direct interface with logic-level or sensor-derived signals.
Latch Enable Threshold	V_IH = 2.0 V min, V_IL = 0.8 V max - TTL/CMOS-compatible control, but latch disabled below 4.3 V supply.
Output Drive	3.2 mA sink/source capability - directly drives 500 Ω loads or up to 40 TTL inputs without external buffers.
Operating Temperature	−40°C to +85°C industrial range - qualified for use in base station timing modules, industrial PLCs, and automotive infotainment interfaces.

Pinout & Package

AD8611ARM-R2 is packaged in an 8-lead MSOP (RM-8) surface-mount package with exposed pad for thermal enhancement. Pin assignments are identical to SOIC variant but with tighter footprint (3 mm × 3 mm).

Pin/Terminal	Circuit Role	Design Meaning
1	V+	Positive supply terminal - must be bypassed with 1 μF + 10 nF capacitors within 0.5 inch for stable high-speed operation.
2	IN+	Noninverting analog input - accepts signals from −200 mV to +3.0 V (5 V supply); input bias current flows out (−7 μA max).
3	IN−	Inverting analog input - differential pair partner to IN+; same voltage range and bias current behavior.
4	V−	Negative supply terminal - tied to GND in single-supply configurations; not floating.
5	LATCH	Latch enable input - active-high TTL/CMOS signal; latches output state only when V+ ≥ 4.3 V.
6	GND	Negative logic supply - connects to system ground plane; critical for minimizing ground bounce in high-speed switching.
7	QA	Complementary output A (true) - open-collector compatible; swings 0.25–0.4 V low / 2.4–3.35 V high depending on load.
8	QA	Complementary output A (inverted) - matches QA timing with matched propagation delay (Δt_P ≤ 2.0 ns).

Key Features

Feature	Design Value
Ultrafast 4 ns propagation delay	Enables timing resolution better than 250 MHz clock period - essential for PCIe Gen1/2 clock recovery and high-speed sampling triggers.
Matched rising/falling delay	Differential delay ≤ 2.0 ns ensures output duty cycle tracks input duty cycle - preserves timing integrity in clock distribution networks.
Single-supply 3 V to 5 V operation	Eliminates need for negative rail or level shifters when interfacing with 3.3 V or 5 V logic families or ADC reference domains.
Latch with 0.5 ns setup/hold	Allows precise capture of transient events (e.g., glitch detection) with minimal timing margin overhead in FPGA or ASIC control paths.
Rail-to-rail input including GND	Supports direct connection to sensors, DAC outputs, or logic signals without external biasing resistors or AC coupling.

Applications

High-Speed Clock Recovery	Line Receiver for Digital Communications
Use Scenario: Recovering clean square-wave clocks from distorted 65 MHz transmission-line signals with 100 mV p-p amplitude in telecom backplanes. IC Role / Device Role / Timing Role: Comparator acting as threshold detector with sub-5 ns decision latency and matched edge delays to preserve duty cycle. Use Value: Restores jitter-free clock edges without PLL complexity; maintains <1% duty cycle distortion over temperature.	Use Scenario: Converting degraded differential or single-ended NRZ data streams (e.g., LVDS, PECL derivatives) into clean CMOS logic levels in PCMCIA or FPGA I/O interfaces. IC Role / Device Role / Timing Role: High-bandwidth analog front-end comparator with 100 MHz bandwidth and fast settling for bit-slice decision making. Use Value: Enables reliable data capture at >100 Mbps without oversampling; latch function holds last valid state during signal dropout.
Zero-Crossing Detector	ADC Sampling Trigger Generator
Use Scenario: Detecting precise zero crossings of 50/60 Hz AC mains or audio band signals in energy metering or Class-D amplifier feedback loops. IC Role / Device Role / Timing Role: Precision comparator with low offset (7 mV typ) and rail-to-rail input enabling direct GND-referenced sensing. Use Value: Reduces phase error to <100 ps vs. ideal zero crossing - critical for harmonic analysis and reactive power calculation.	Use Scenario: Generating synchronous sampling pulses for pipeline or flash ADCs requiring sub-5 ns jitter tolerance in test equipment or radar receivers. IC Role / Device Role / Timing Role: Ultra-low-jitter trigger source using latch to freeze comparator output at exact input threshold crossing. Use Value: Limits aperture jitter to <2.5 ps RMS - directly improves ENOB in 12-bit+ ADC systems operating above 10 MSPS.

High-Speed Clock Recovery

Line Receiver for Digital Communications

Use Scenario: Recovering clean square-wave clocks from distorted 65 MHz transmission-line signals with 100 mV p-p amplitude in telecom backplanes.

IC Role / Device Role / Timing Role: Comparator acting as threshold detector with sub-5 ns decision latency and matched edge delays to preserve duty cycle.

Use Value: Restores jitter-free clock edges without PLL complexity; maintains <1% duty cycle distortion over temperature.

Use Scenario: Converting degraded differential or single-ended NRZ data streams (e.g., LVDS, PECL derivatives) into clean CMOS logic levels in PCMCIA or FPGA I/O interfaces.

IC Role / Device Role / Timing Role: High-bandwidth analog front-end comparator with 100 MHz bandwidth and fast settling for bit-slice decision making.

Use Value: Enables reliable data capture at >100 Mbps without oversampling; latch function holds last valid state during signal dropout.

Zero-Crossing Detector

ADC Sampling Trigger Generator

Use Scenario: Detecting precise zero crossings of 50/60 Hz AC mains or audio band signals in energy metering or Class-D amplifier feedback loops.

IC Role / Device Role / Timing Role: Precision comparator with low offset (7 mV typ) and rail-to-rail input enabling direct GND-referenced sensing.

Use Value: Reduces phase error to <100 ps vs. ideal zero crossing - critical for harmonic analysis and reactive power calculation.

Use Scenario: Generating synchronous sampling pulses for pipeline or flash ADCs requiring sub-5 ns jitter tolerance in test equipment or radar receivers.

IC Role / Device Role / Timing Role: Ultra-low-jitter trigger source using latch to freeze comparator output at exact input threshold crossing.

Use Value: Limits aperture jitter to <2.5 ps RMS - directly improves ENOB in 12-bit+ ADC systems operating above 10 MSPS.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed comparator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1394CS8#PBF	7 ns typical propagation delay; no latch function; wider supply range (±5 V or 3.3 V single); higher input bias current (+25 μA).	Suitable for general-purpose high-speed comparison where latch is unnecessary and bipolar supplies exist.	Select LT1394CS8#PBF only if latch functionality is not required and system already supports its higher supply current (12 mA vs. AD8611ARM-R2's 10 mA).
TLV3501CDR	4.5 ns propagation delay; rail-to-rail output; no latch; CMOS input (pA bias current); 2.7–5.5 V supply.	Better for low-power, high-impedance sensor interfaces where input bias current must be minimized.	Choose TLV3501CDR when interfacing with high-Z sources (e.g., piezoelectric sensors) and latch is not needed - but verify 4.5 ns delay meets timing budget.

Compared with LT1394CS8#PBF and TLV3501CDR, AD8611ARM-R2 uniquely combines sub-5 ns delay, integrated latch, and bipolar-input robustness for timing-critical applications where duty-cycle fidelity and event capture are mandatory - neither alternative offers this combination.

Availability

AD8611ARM-R2 is available at Aetrix Electronics and suitable for high-speed clock recovery, line receiver design, and precision zero-crossing detection requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AD8611ARM-R2 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8611ARM-R2 belongs to Analog Devices' precision high-speed comparator product line, engineered specifically for timing-critical applications demanding nanosecond-level propagation delay, latch capability, and industrial-grade reliability.

FAQ

What is the minimum supply voltage required for the AD8611ARM-R2 latch function to operate?

The AD8611ARM-R2 latch function is not operational below 4.3 V supply voltage. At V+ = 4.3 V, VIH threshold is guaranteed at 2.0 V minimum and VIL at 0.8 V maximum. Below 4.3 V, the latch pin becomes unresponsive and must be held low to avoid undefined behavior. This constraint is explicitly specified in the AD8611ARM-R2 datasheet Rev. B, Table 1 and General Description section.

Can the AD8611ARM-R2 operate from a 3.0 V single supply, and what performance changes occur?

Yes, the AD8611ARM-R2 operates from 3.0 V single supply, but with reduced specifications: input common-mode range shrinks to 0 V to 1.0 V, VOH drops to 1.21 V (I_OH = −3.2 mA), and propagation delay increases to 4.5–6.5 ns. The latch remains nonfunctional at 3.0 V. These values are confirmed in AD8611ARM-R2 datasheet Table 2 and Applications Information section.

How does the AD8611ARM-R2 achieve matched rising and falling propagation delays?

The AD8611ARM-R2 achieves matched delays (Δt_P ≤ 2.0 ns) through symmetric bipolar PNP input stage design and balanced internal gain-stage loading. This matching is measured under 100 mV step with 100 mV overdrive and tracked over −40°C to +85°C. Matched delay ensures output duty cycle fidelity - critical for clock recovery applications as documented in the AD8611ARM-R2 General Description and Figure 7–12.

Is the AD8611ARM-R2 pin-compatible with the LT1016, and what key design adjustments are needed?

Yes, the AD8611ARM-R2 is pin-for-pin compatible with LT1016 in 8-lead SOIC and MSOP packages. Key adjustments include: (1) limiting input common-mode voltage to ≤3.0 V on 5 V supply (vs. LT1016's 1.5 V below V+), (2) accounting for output swing differences (AD8611ARM-R2 sinks to 0.4 V vs. LT1016's 0.8 V), and (3) reducing supply current from 25 mA (LT1016) to 10 mA (AD8611ARM-R2). These are detailed in the AD8611ARM-R2 Applications Information section.

What is the maximum capacitive load the AD8611ARM-R2 can drive without exceeding 5 ns propagation delay?

The AD8611ARM-R2 maintains ≤5 ns propagation delay with capacitive loads under 33 pF, as shown in Table 7 of the AD8611ARM-R2 datasheet. At 100 pF, delay rises to 8 ns (rising) and 7 ns (falling). Loads >500 pF cause output ringing. For designs requiring <5 ns timing, keep total node capacitance (including PCB trace + scope probe + gate input) below 30 pF using short traces and minimal stubs.

AD8611ARM-R2 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: with Latch

Number of Elements:: 1

Output Type:: Complementary, TTL

Voltage - Supply, Single/Dual (±):: 3V ~ 5V

:: 7mV @ 5V

Voltage - Input Offset (Max):: 6µA @ 5V

Current - Input Bias (Max):: -

Current - Output (Typ):: 10mA, 4mA

Current - Quiescent (Max):: 85dB CMRR, 73dB PSRR

CMRR, PSRR (Typ):: 5.5ns

Propagation Delay (Max):: -

Hysteresis:: -40°C ~ 85°C

Operating Temperature:: -

Grade:: -

Qualification:: Surface Mount

:: 8-MSOP

AD8611ARM-R2 FAQ

1.How can I place an order for AD8611ARM-R2 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD8611ARM-R2 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 AD8611ARM-R2 reliable?

The price and inventory of AD8611ARM-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8611ARM-R2 is usually 5 days.

3.What payment methods are accepted for AD8611ARM-R2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8611ARM-R2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD8611ARM-R2?

AD8611ARM-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD8611ARM-R2 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 AD8611ARM-R2?

For technical support, including AD8611ARM-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8611ARM-R2 requirements.

6.How does Aetrix verify that AD8611ARM-R2 is sourced from the original manufacturer or authorized distributors?

All AD8611ARM-R2 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 AD8611ARM-R2 meets industry standards.

7.What is the process for return or replacement of AD8611ARM-R2?

All AD8611ARM-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD8611ARM-R2, 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 AD8611ARM-R2 part is unused and in its original packaging.

Return procedure for AD8611ARM-R2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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