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

Analog Devices Inc. AD8612ARUZ

Name: AD8612ARUZ
Brand: Analog Devices Inc.
SKU: AD8612ARUZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD8612ARUZ

Manufacturer:: Analog Devices Inc.

Category:: Comparators

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: AD8612ARUZ.pdf

Description:: IC COMPARATOR 2 W/LATCH 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD8612ARUZ from Analog Devices is a dual ultrafast comparator with latch function, complementary outputs (QA/QB), and 4 ns propagation delay at 5 V supply. It operates from 3 V to 5 V single supply, supports 100 MHz input signals, and features matched rising/falling delay tracking for precise clock recovery. Used in high-speed timing circuits, line receivers, and ADC sampling front-ends.

For engineers reviewing the AD8612ARUZ datasheet, AD8612ARUZ pinout, AD8612ARUZ application, or AD8612ARUZ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated TSSOP-14 pin functions, and two confirmed alternative comparators for timing-critical systems requiring sub-5 ns response and latch-enabled output hold.

Technical Context

The AD8612ARUZ integrates two independent high-speed comparators with bipolar PNP input stages, enabling −200 mV to +3.0 V input common-mode range on 5 V supply. Each channel includes dedicated latch enable (LEA/LEB), complementary QA/QB outputs, and TTL/CMOS-compatible logic thresholds (VIH = 2.0 V, VIL = 0.8 V) - functional only when VCC ≥ 4.3 V.

Propagation delay matching (ΔtP ≤ 2.0 ns) and temperature-stable delay performance (±0.5 ns over −40°C to +85°C) support duty-cycle-preserving clock recovery. Input capacitance is 3.0 pF, and latch setup/hold times are both 0.5 ns - critical for synchronous edge capture in digital communications and phase detection.

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 <5 ns timing resolution in clock distribution paths.
Input Frequency Support	100 MHz sine wave (400 mV p-p) - suitable for recovering high-speed serial clock signals without distortion.
Supply Range	3 V to 5 V single supply - allows direct interface with 3.3 V and 5 V logic domains without level shifters.
Input Common-Mode Range	0 V to 3.0 V at 5 V supply - covers rail-to-rail sensing down to GND, supporting zero-crossing detection.
Latch Enable Threshold	VIH = 2.0 V min, VIL = 0.8 V max - ensures compatibility with standard TTL/CMOS control signals.
Output Drive Capability	3.2 mA sink/source at VOL = 0.4 V / VOH = 2.4 V - sufficient to drive 40 TTL loads or terminate into 400 Ω.
Operating Temperature	−40°C to +85°C industrial range - validated for embedded timing in automotive and industrial control modules.

Pinout & Package

AD8612ARUZ is housed in a 14-lead TSSOP (RU-14) package with 0.65 mm pitch, exposed pad optional, and JEDEC MO-153 compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
1	V+	Positive supply rail (3 V–5 V); decoupling capacitor must be placed within 0.5 inch.
2	INB+	Noninverting input for Channel B; bipolar PNP stage accepts inputs down to −200 mV below GND.
3	INB−	Inverting input for Channel B; matched delay tracking requires symmetric source impedance ≤1 kΩ.
4	V−	Negative supply terminal (typically GND); separate ground return path recommended for noise immunity.
5	LEB	Latch enable for Channel B; inactive if V+ < 4.3 V; 0.5 ns setup/hold required for reliable state capture.
6	GND	Digital logic ground reference; tied to system ground plane to minimize ground bounce in high-speed switching.
7	LEA	Latch enable for Channel A; independent control per channel enables selective output freeze in multi-channel timing.
8	INA+	Noninverting input for Channel A; same input stage as INB+, ensuring matched offset and CMRR across channels.
9	INA−	Inverting input for Channel A; differential pair bias current is −4.5 μA max over temperature.
10	QA	Complementary output A (true); drives low to 0.4 V @ 3.2 mA - compatible with 3.3 V logic inputs.
11	QA	Complementary output A (inverted); paired with Pin 10 to form full differential output for ECL-level signaling.
12	QB	Complementary output B (true); independent timing path enables dual-window or phase-comparison architectures.
13	QB	Complementary output B (inverted); identical drive strength and delay to QA pins - no cross-talk impact.
14	GND	Second ground terminal; used for low-inductance return path for output currents and latch logic.

Key Features

Feature	Design Value
4 ns propagation delay with matched rise/fall	Enables accurate clock recovery where output duty cycle must mirror input - critical for SERDES and jitter-sensitive PLLs.
Dual independent latch enables (LEA/LEB)	Allows per-channel output freeze without affecting the other comparator - essential for gated sampling or strobed data capture.
Bipolar PNP input stage	Delivers −200 mV to +3.0 V input common-mode range on 5 V supply - supports ground-referenced signal detection and rail-sensing.
3.0 pF input capacitance	Minimizes R-C lag with source impedances ≤1 kΩ - preserves 4 ns timing integrity in PCB traces and probe interfaces.
100 MHz small-signal bandwidth	Validated for clean comparison of fast edges up to 100 MHz sine input - suitable for read channel detection in HDD/SSD controllers.

Applications

High-Speed Clock Recovery	Line Receiver for Digital Communications
Use Scenario: Recovering distorted 65 MHz clock signals from PCB traces with reflections and capacitive loading. IC Role / Device Role / Timing Role: Dual comparator acting as threshold detector with matched delay to preserve input duty cycle at QA/QB outputs. Use Value: 4 ns propagation delay and ΔtP ≤ 2.0 ns ensure recovered clock maintains <1% duty cycle distortion - meeting PCIe Gen1 timing budgets.	Use Scenario: Converting degraded LVDS or PECL-level data streams into clean CMOS logic for FPGA input capture. IC Role / Device Role / Timing Role: High-speed line receiver using AD8612ARUZ's 100 MHz input capability and 3.2 mA drive to interface with 3.3 V I/O banks. Use Value: Single-supply 3 V–5 V operation eliminates level-shifter ICs; latch function holds last valid data during signal dropout.
Phase Detector in PLL Systems	ADC Sampling Trigger Generator
Use Scenario: Detecting zero-crossing and phase alignment between reference and feedback clocks in analog PLL designs. IC Role / Device Role / Timing Role: Dual comparator configured as XOR phase detector, with LEA/LEB enabling synchronous sampling of phase error pulses. Use Value: Matched propagation delay across channels ensures <50 ps phase error measurement resolution - improving loop stability.	Use Scenario: Generating precise, jitter-minimized sampling strobes for 10-bit+ ADCs in oscilloscope front-ends. IC Role / Device Role / Timing Role: Window comparator built with AD8612ARUZ channels to detect valid analog input range before triggering conversion. Use Value: Sub-10 ns total window comparator delay (including external transistors) enables >100 MSPS effective sampling rates.

High-Speed Clock Recovery

Line Receiver for Digital Communications

Use Scenario: Recovering distorted 65 MHz clock signals from PCB traces with reflections and capacitive loading.

IC Role / Device Role / Timing Role: Dual comparator acting as threshold detector with matched delay to preserve input duty cycle at QA/QB outputs.

Use Value: 4 ns propagation delay and ΔtP ≤ 2.0 ns ensure recovered clock maintains <1% duty cycle distortion - meeting PCIe Gen1 timing budgets.

Use Scenario: Converting degraded LVDS or PECL-level data streams into clean CMOS logic for FPGA input capture.

IC Role / Device Role / Timing Role: High-speed line receiver using AD8612ARUZ's 100 MHz input capability and 3.2 mA drive to interface with 3.3 V I/O banks.

Use Value: Single-supply 3 V–5 V operation eliminates level-shifter ICs; latch function holds last valid data during signal dropout.

Phase Detector in PLL Systems

ADC Sampling Trigger Generator

Use Scenario: Detecting zero-crossing and phase alignment between reference and feedback clocks in analog PLL designs.

IC Role / Device Role / Timing Role: Dual comparator configured as XOR phase detector, with LEA/LEB enabling synchronous sampling of phase error pulses.

Use Value: Matched propagation delay across channels ensures <50 ps phase error measurement resolution - improving loop stability.

Use Scenario: Generating precise, jitter-minimized sampling strobes for 10-bit+ ADCs in oscilloscope front-ends.

IC Role / Device Role / Timing Role: Window comparator built with AD8612ARUZ channels to detect valid analog input range before triggering conversion.

Use Value: Sub-10 ns total window comparator delay (including external transistors) enables >100 MSPS effective sampling rates.

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#TRPBF	7 ns typical propagation delay; no latch function; wider supply range (±5 V or 3.3 V–12 V); higher input bias current (±10 μA).	Used in legacy designs where latch is unnecessary and supply flexibility outweighs speed penalty.	Select when latch-free operation and dual-supply compatibility are prioritized over sub-5 ns timing.
MAX961ESA+	4.5 ns propagation delay; single-channel; no latch; rail-to-rail inputs; lower supply current (3.5 mA vs. 10 mA per channel).	Suitable for space-constrained single-comparator nodes where latch control is handled externally.	Choose for compact 8-pin SOIC layouts and ultra-low power (<4 mA) requirements - not for dual-channel or latch-dependent use cases.

Compared with LT1394CS8#TRPBF and MAX961ESA+, the AD8612ARUZ uniquely delivers dual-channel 4 ns delay with per-channel latch enable in a single RU-14 package - making it irreplaceable in synchronized high-speed sampling, clock recovery, and phase detection where output state retention and inter-channel timing coherence are mandatory.

Availability

AD8612ARUZ is available at Aetrix Electronics and suitable for high-speed timing circuits, clock distribution networks, and digital communications line receivers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AD8612ARUZ 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 is a global leader in high-performance analog, mixed-signal, and DSP technologies, serving precision instrumentation, industrial automation, and communications markets since 1965.

The AD8612ARUZ belongs to Analog Devices' ultrafast comparator product line, engineered specifically for sub-5 ns timing-critical applications including clock recovery, phase detection, and high-speed ADC triggering in test equipment and telecom infrastructure.

FAQ

What is the minimum supply voltage required for the latch function of AD8612ARUZ to operate?

The latch function of AD8612ARUZ is not operational below 4.3 V supply. At V+ < 4.3 V, the LEA and LEB inputs become unresponsive and must be held low to avoid undefined behavior. This threshold is specified in the Absolute Maximum Ratings and Applications Information sections of the AD8612ARUZ datasheet, and applies across the full −40°C to +85°C operating range.

Does AD8612ARUZ support rail-to-rail input common-mode voltage on a 5 V supply?

No, AD8612ARUZ does not support full rail-to-rail input common-mode voltage. On a 5 V supply, its input common-mode range is specified as 0 V to 3.0 V - meaning inputs must stay within 200 mV above GND and at least 2 V below V+. This limitation arises from its bipolar PNP input stage architecture, which extends down to −200 mV but only up to V+ − 2 V.

Can AD8612ARUZ drive a 50 Ω transmission line directly?

No, AD8612ARUZ cannot drive a 50 Ω load directly. Its output is rated for minimum 400 Ω resistive load or up to 40 TTL inputs. Driving 50 Ω would exceed its 3.2 mA output current rating and cause excessive VOL degradation and potential thermal stress. For 50 Ω interfaces, a dedicated line driver or resistor-terminated configuration with series matching is required.

How does propagation delay matching between rising and falling edges benefit AD8612ARUZ applications?

AD8612ARUZ achieves ≤2.0 ns differential propagation delay (ΔtP) between rising and falling edges, ensuring output duty cycle closely mirrors input duty cycle. This is essential in clock recovery applications - for example, reconstructing a 50% duty cycle 100 MHz clock from a distorted waveform - where skew-induced jitter would degrade downstream PLL lock or data eye integrity.

Is AD8612ARUZ pin-compatible with any industry-standard comparators?

AD8612ARUZ is not pin-compatible with standard single-channel comparators like LT1016 or LT1394 due to its dual-channel + dual-latch + dual-complementary-output architecture in 14-pin TSSOP. However, the single-channel AD8611 (8-pin SOIC/MSOP) is pin-compatible with LT1016 and LT1394. AD8612ARUZ requires custom layout for its RU-14 footprint and dedicated LEA/LEB/GND pin assignments.

AD8612ARUZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Series:: -

Packaging:: Tube

Product Status:: Active

Type:: with Latch

Number of Elements:: 2

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

:: 14-TSSOP

AD8612ARUZ FAQ

1.How can I place an order for AD8612ARUZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD8612ARUZ 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 AD8612ARUZ reliable?

The price and inventory of AD8612ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8612ARUZ is usually 5 days.

3.What payment methods are accepted for AD8612ARUZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8612ARUZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD8612ARUZ?

AD8612ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD8612ARUZ 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 AD8612ARUZ?

For technical support, including AD8612ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8612ARUZ requirements.

6.How does Aetrix verify that AD8612ARUZ is sourced from the original manufacturer or authorized distributors?

All AD8612ARUZ 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 AD8612ARUZ meets industry standards.

7.What is the process for return or replacement of AD8612ARUZ?

All AD8612ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8612ARUZ, 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 AD8612ARUZ part is unused and in its original packaging.

Return procedure for AD8612ARUZ:

1.Submit a request within 90 days.

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

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