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Home > Products > Integrated Circuits (ICs) > Linear > Special Purpose Amplifiers

Analog Devices Inc./Maxim Integrated MAX3265EUE+

Name: MAX3265EUE+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX3265EUE+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX3265EUE+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Special Purpose Amplifiers

Package:: 16-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: MAX3265EUE+.pdf

Description:: IC POWER MANAGEMENT

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX3265EUE+ from Maxim Integrated is a 2.5Gbps CML-output limiting amplifier designed for Fibre Channel and Gigabit Ethernet optical receiver front-ends. It operates from +3.0V to +5.5V, delivers 49dB gain, exhibits 11ps deterministic jitter (typ), supports programmable loss-of-signal detection via external R_TH, and is housed in a 16-pin TSSOP-EP package rated for -40°C to +85°C.

For engineers reviewing the MAX3265EUE+ datasheet, MAX3265EUE+ pinout, MAX3265EUE+ application, or MAX3265EUE+ equivalent, key selection criteria include its guaranteed industrial temperature range, CML output compatibility with GBIC receivers, low-jitter performance at 2.5Gbps, and integrated RMS power detection with configurable LOS hysteresis.

Technical Context

The MAX3265EUE+ implements a multistage limiting amplifier architecture with an integrated RMS power detector and offset-correction loop using CAZ1/CAZ2 pins. Its input buffer presents 100Ω differential impedance and accepts signals from transimpedance amplifiers like MAX3266/MAX3267.

It features programmable squelch control via the SQUELCH pin, dual-level CML output current selection (16mA/20mA) via the LEVEL pin, and loss-of-signal assertion thresholds set by R_TH values of 2.5kΩ, 7kΩ, or 20kΩ - enabling precise optical power monitoring across varying link budgets.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	2.5Gbps - supports full-rate Fibre Channel 2x and Gigabit Ethernet physical layer compliance.
Deterministic Jitter	11ps (typ) - ensures timing margin for high-speed serial eye opening at 2.5Gbps.
Input Voltage Range	10mV to 1200mV_pp - accommodates wide dynamic range from optical preamplifiers.
LOS Hysteresis	2.2dB to 4.4dB - provides stable optical signal detect behavior against noise-induced toggling.
Output Resistance	85–115Ω (single-ended) - matches standard 50Ω or 75Ω transmission line terminations.
Supply Voltage	+3.0V to +5.5V - enables direct interface with common 3.3V or 5V system rails without regulation.
Operating Temp	-40°C to +85°C - qualified for industrial and extended-temperature optical module deployments.

Pinout & Package

MAX3265EUE+ is packaged in a 16-pin TSSOP with exposed paddle (TSSOP-EP), requiring soldering of the EP pad to PCB ground for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1, 4	GND	Power ground reference; EP pad must be connected to PCB ground plane.
2, 3	CAZ1, CAZ2	Offset-correction loop capacitors; external 0.1µF sets f_OC ≈ 2kHz for NRZ data.
5, 8	IN+, IN-	Differential input pair; 100Ω matched impedance for TIA interfacing.
6	TH	Loss-of-signal threshold programming node; R_TH to GND sets LOS assert level.
7, 10	VCC	Positive supply; decoupling required per high-speed layout guidelines.
9, 13	OUT+, OUT-	CML differential outputs; terminated per Figure 1 (50Ω or 75Ω) for optimal signal integrity.
11, 14	LOS, LOS	Complementary TTL-compatible loss-of-signal indicators; internally pulled up to 8kΩ.
15	LEVEL	CML output current select: open = ~16mA, GND = ~20mA.
16	SQUELCH	TTL-controlled mute: high = squelch enabled when LOS asserted.

Key Features

Feature	Design Value
Programmable LOS Threshold	R_TH-based configuration enables precise optical power detection across multiple link budgets (e.g., 2.20–41.5mV assert levels).
CML Output Tolerance	Robust against inductive connectors and impedance mismatches - critical for GBIC/SFP module interconnect reliability.
Low Deterministic Jitter	11ps (typ) at 2.5Gbps ensures >0.3UI eye opening margin in real-world optical channel conditions.
Integrated Offset Correction	CAZ1/CAZ2-configurable loop suppresses DC offsets to <100µV, preserving RMS power detection accuracy.
Industrial Temperature Range	Guaranteed operation from -40°C to +85°C - suitable for uncontrolled-environment optical transceivers.

Applications

Gigabit Ethernet Optical Receiver	Fibre Channel 2x Receiver
Use Scenario: Front-end limiting amplifier in 1000BASE-SX/LX optical transceivers receiving signals from PIN/APD photodiodes via TIA. IC Role / Device Role / Timing Role: Converts variable-amplitude analog input into clean, constant-level CML data stream synchronized to recovered clock. Use Value: Enables reliable 1.25Gbps data recovery with <11ps deterministic jitter and programmable LOS for link fault reporting.	Use Scenario: Signal conditioning stage in 2x Fibre Channel (2.125Gbps) SFP modules used in storage area networks. IC Role / Device Role / Timing Role: Provides gain, limiting, and loss-of-signal indication for optical receiver subsystems compliant with FC-PI-2. Use Value: Delivers 2.5Gbps capability with 4.4dB LOS hysteresis to prevent false disconnects during marginal optical link conditions.
GBIC Optical Module	Optical Interconnect Backplane
Use Scenario: Core limiting amplifier in hot-pluggable GBIC modules supporting both multimode and single-mode fiber links. IC Role / Device Role / Timing Role: Interfaces directly with MAX3266/MAX3267 TIAs and drives CML-compatible host logic or retimers. Use Value: 16-pin TSSOP-EP package fits GBIC mechanical constraints while delivering guaranteed -40°C to +85°C operation.	Use Scenario: High-speed serial data conditioning in board-to-board optical interconnects using VCSEL-based links. IC Role / Device Role / Timing Role: Restores signal amplitude and edge integrity after channel-induced attenuation and dispersion. Use Value: 100–155ps edge speed and 230µV_RMS input-referred noise preserve signal fidelity over 10cm+ optical traces.

Gigabit Ethernet Optical Receiver

Fibre Channel 2x Receiver

Use Scenario: Front-end limiting amplifier in 1000BASE-SX/LX optical transceivers receiving signals from PIN/APD photodiodes via TIA.

IC Role / Device Role / Timing Role: Converts variable-amplitude analog input into clean, constant-level CML data stream synchronized to recovered clock.

Use Value: Enables reliable 1.25Gbps data recovery with <11ps deterministic jitter and programmable LOS for link fault reporting.

Use Scenario: Signal conditioning stage in 2x Fibre Channel (2.125Gbps) SFP modules used in storage area networks.

IC Role / Device Role / Timing Role: Provides gain, limiting, and loss-of-signal indication for optical receiver subsystems compliant with FC-PI-2.

Use Value: Delivers 2.5Gbps capability with 4.4dB LOS hysteresis to prevent false disconnects during marginal optical link conditions.

GBIC Optical Module

Optical Interconnect Backplane

Use Scenario: Core limiting amplifier in hot-pluggable GBIC modules supporting both multimode and single-mode fiber links.

IC Role / Device Role / Timing Role: Interfaces directly with MAX3266/MAX3267 TIAs and drives CML-compatible host logic or retimers.

Use Value: 16-pin TSSOP-EP package fits GBIC mechanical constraints while delivering guaranteed -40°C to +85°C operation.

Use Scenario: High-speed serial data conditioning in board-to-board optical interconnects using VCSEL-based links.

IC Role / Device Role / Timing Role: Restores signal amplitude and edge integrity after channel-induced attenuation and dispersion.

Use Value: 100–155ps edge speed and 230µV_RMS input-referred noise preserve signal fidelity over 10cm+ optical traces.

Equivalent & Alternatives

The following parts are listed as comparable options for similar limiting amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3265CUE+	Same functionality and pinout, but rated only for 0°C to +70°C ambient.	Not suitable for industrial environments requiring extended temperature operation.	Select MAX3265EUE+ when operating outside 0°C–70°C, e.g., outdoor telecom or industrial control cabinets.
MAX3265CUB+	10-pin µMAX-EP package, same electrical specs, SQUELCH internally unconnected.	Smaller footprint ideal for space-constrained SFP modules; lacks external squelch control.	Choose MAX3265CUB+ for compact SFP designs where squelch is not required or handled externally.

Compared with MAX3265CUE+ and MAX3265CUB+, the MAX3265EUE+ uniquely combines industrial temperature qualification (-40°C to +85°C) with full external squelch control and TSSOP packaging optimized for GBIC mechanical compatibility.

Availability

MAX3265EUE+ is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel 2x modules, and GBIC-based systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX3265EUE+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for communications, computing, and industrial applications.

The MAX3265 series belongs to Maxim's high-speed optical receiver IC portfolio, engineered specifically for 2.5Gbps limiting amplification in GBIC, SFP, and custom optical modules with integrated LOS and squelch functions.

FAQ

What is the guaranteed operating temperature range for MAX3265EUE+?

The MAX3265EUE+ is fully specified and tested over -40°C to +85°C ambient temperature. This industrial-grade rating distinguishes it from the commercial-grade MAX3265CUE+ (0°C to +70°C) and ensures reliable operation in harsh environments such as outdoor telecom enclosures or factory automation systems where the MAX3265EUE+ must maintain jitter and gain performance across the full range.

How does the LOS threshold programming work on MAX3265EUE+?

The MAX3265EUE+ uses an external resistor R_TH connected from pin 6 (TH) to ground to set the loss-of-signal assertion level. Three standard configurations are supported: R_TH = 2.5kΩ yields low-threshold detection (2.20–4.8mV), 7kΩ enables medium threshold (9.9–43.0mV), and 20kΩ provides high threshold (18.0–111mV). The MAX3265EUE+ datasheet provides exact curves linking R_TH to mV thresholds across temperature.

Does MAX3265EUE+ support both AC- and DC-coupled inputs?

No - DC-coupling the inputs of MAX3265EUE+ is explicitly not recommended per the datasheet, as it prevents the internal DC offset-correction circuitry from functioning. The MAX3265EUE+ requires AC-coupled inputs (e.g., 0.01µF capacitors as shown in Typical Operating Circuits) to allow the CAZ1/CAZ2 loop to correct baseline drift and maintain low deterministic jitter and accurate RMS power detection.

What is the function of the LEVEL pin on MAX3265EUE+?

The LEVEL pin (pin 15) selects CML output current on MAX3265EUE+: left open, it delivers ~16mA per output; tied to ground, it increases to ~20mA. This adjustment changes output swing and drive strength to match different termination schemes (e.g., 50Ω vs. 75Ω loads per Figure 1), allowing optimization of signal integrity without modifying external resistors - a key flexibility feature absent in fixed-output alternatives.

Can MAX3265EUE+ be used in PECL-based systems?

No - MAX3265EUE+ provides CML outputs only. For PECL-compatible operation, designers must select the MAX3269 family (e.g., MAX3269CUB+), which shares identical gain, jitter, and LOS functionality but features PECL outputs terminated to V_CC – 2V. Attempting to interface MAX3265EUE+ CML outputs directly with PECL receivers will result in incorrect logic levels and potential signal integrity failure.

MAX3265EUE+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Bulk

Product Status:: Obsolete

Type:: Limiting Amplifier

Applications:: Optical Networks

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-TSSOP-EP

MAX3265EUE+ FAQ

1.How can I place an order for MAX3265EUE+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX3265EUE+ 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 MAX3265EUE+ reliable?

The price and inventory of MAX3265EUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3265EUE+ is usually 5 days.

3.What payment methods are accepted for MAX3265EUE+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3265EUE+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3265EUE+?

MAX3265EUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX3265EUE+ 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 MAX3265EUE+?

For technical support, including MAX3265EUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3265EUE+ requirements.

6.How does Aetrix verify that MAX3265EUE+ is sourced from the original manufacturer or authorized distributors?

All MAX3265EUE+ 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 MAX3265EUE+ meets industry standards.

7.What is the process for return or replacement of MAX3265EUE+?

All MAX3265EUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3265EUE+, 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 MAX3265EUE+ part is unused and in its original packaging.

Return procedure for MAX3265EUE+:

1.Submit a request within 90 days.

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

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