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

Analog Devices Inc./Maxim Integrated MAX3269CUB

Name: MAX3269CUB
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX3269CUB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX3269CUB

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Special Purpose Amplifiers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Datasheet:: MAX3269CUB.pdf

Description:: IC LIMITING AMP 10UMAX

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX3269CUB from Maxim Integrated is a 2.5Gbps PECL-output limiting amplifier designed for Fibre Channel and Gigabit Ethernet optical receiver front-ends. It features programmable loss-of-signal (LOS) detection with 4.4dB hysteresis, 11ps deterministic jitter (p-p), 100–150ps data output edge speed, and operates from +3.0V to +5.5V supply. Its 10-pin µMAX-EP package supports compact SFF receiver modules.

For engineers reviewing the MAX3269CUB datasheet, MAX3269CUB pinout, MAX3269CUB application, or MAX3269CUB equivalent, this page delivers verified electrical specs, PECL interface behavior, LOS threshold programming via R_TH, thermal design guidance for the exposed paddle, and real-world substitution options for optical receiver signal chain design.

Technical Context

The MAX3269CUB implements a multistage limiting amplifier with RMS power detection and offset-correction loop (CAZ1/CAZ2). Its 49dB gain stage is optimized for low deterministic jitter, supported by Bessel-filtered input conditioning and internal DC-offset cancellation (<100µV typical).

It delivers standards-compliant PECL outputs referenced to V_CC − 2V, with output high/low voltages of −0.880V/−1.620V (typ), and requires external 50Ω termination to V_CC − 2V. The SQUELCH function is internally unconnected in the 10-pin µMAX package, disabling squelch by default.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	2.5Gbps - supports full-rate Fibre Channel 2x and Gigabit Ethernet physical layer signaling.
Deterministic Jitter	11ps (p-p) - measured per ANSI X3.230 Annex A using K28.5 pattern; enables robust eye opening at 2.5Gbps.
Input Voltage Range	10mV to 1200mV (p-p) - accommodates wide dynamic range from transimpedance amplifiers like MAX3266/MAX3267.
LOS Hysteresis	2.2dB to 4.4dB - set by R_TH; provides stable optical signal detect with 2.2dB optical hysteresis.
Output Edge Speed	100ps to 150ps (max) - ensures fast transitions while maintaining controlled slew for EMI and signal integrity.
Supply Voltage	+3.0V to +5.5V - compatible with common optical module power rails; supports 3.3V and 5V systems.
Power-Supply Current	50mA to 76mA - measured at V_CC = +3.3V, TA = +25°C; enables thermal management in dense SFF layouts.

Pinout & Package

MAX3269CUB uses a 10-pin µMAX-EP package (0.061" × 0.061", 0.6mm pitch) with exposed paddle soldered to PCB ground for thermal performance. Pin 1 is V_CC, pin 10 is GND; the exposed paddle (EP) is electrically and thermally connected to ground.

Pin/Terminal	Circuit Role	Design Meaning
V_CC (Pins 1, 6)	Positive supply rail	Dual V_CC pins reduce supply impedance; must be decoupled locally with 0.01µF ceramic capacitors.
GND (Pins 2, 7)	Ground reference	Dual ground pins improve return path integrity; exposed paddle must be soldered to solid ground plane.
IN+ / IN− (Pins 3, 4)	Differential input	100Ω differential input impedance; DC-coupling prohibited to preserve offset correction functionality.
OUT+ / OUT− (Pins 8, 9)	PECL differential output	Require 50Ω termination to V_CC − 2V; output swing referenced to V_CC, not ground.
LOS / LOS (Pins 5, 10)	Complementary loss-of-signal outputs	Internally pulled up to 8kΩ; TTL-compatible when loaded ≥4.7kΩ; assert on input signal drop below R_TH-set threshold.
TH (Pin 5)	LOS threshold programming	Resistor from TH to GND sets LOS assert level (e.g., 2.5kΩ → 4.8mV low-level assert); no internal connection to SQUELCH.

Key Features

Feature	Design Value
PECL output compliance	Meets industry-standard PECL voltage levels (−0.880V high, −1.620V low) with 50Ω load to V_CC − 2V - eliminates need for level-shifting in SFF receivers.
Programmable LOS hysteresis	Configurable 2.2–4.4dB hysteresis via R_TH - prevents false LOS toggling during optical power fluctuations in real-world fiber links.
Low-input-referred noise	230µV_RMS - preserves signal-to-noise ratio when amplifying weak signals from PIN/TIA stages.
Stable offset correction	Internal feedback loop reduces input offset to <100µV - maintains accuracy of RMS power detection across temperature and process variation.
Compact µMAX-EP footprint	1.55mm × 1.55mm body with exposed paddle - enables high-density placement in space-constrained SFF and SFP modules.

Applications

Fibre Channel 2x Receiver	Gigabit Ethernet Optical Module
Use Scenario: Front-end limiting amplifier in 2.125Gbps Fibre Channel transceivers compliant with FC-PI-2. IC Role / Device Role / Timing Role: Converts variable-amplitude TIA output into constant-level PECL data stream with precise LOS assertion. Use Value: Enables reliable link initialization and fault reporting via TTL-compatible LOS outputs tied to host controller GPIOs.	Use Scenario: Signal conditioning stage in 1000BASE-SX/LX optical transceivers. IC Role / Device Role / Timing Role: Provides jitter-controlled 2.5Gbps PECL output compatible with PHY clock/data recovery circuits. Use Value: Delivers 11ps deterministic jitter and 100–150ps edge speed - meets IEEE 802.3z eye mask requirements without post-equalization.
Small-Form-Factor (SFF) Transceiver	Optical Interconnect Backplane
Use Scenario: Core limiting amplifier in SFF-8472-compliant modules with digital diagnostics. IC Role / Device Role / Timing Role: Generates LOS status and drives PECL data to host serializer/deserializer. Use Value: Exposed paddle thermal design supports continuous operation at 70°C ambient - critical for sealed SFF housings.	Use Scenario: High-speed board-to-board optical interconnect using VCSEL-based links. IC Role / Device Role / Timing Role: Amplifies low-swing differential signals from short-reach optical receivers before retiming. Use Value: 49dB gain and 10–1200mV input range accommodate signal degradation over FR4 traces and multimode fiber.

Fibre Channel 2x Receiver

Gigabit Ethernet Optical Module

Use Scenario: Front-end limiting amplifier in 2.125Gbps Fibre Channel transceivers compliant with FC-PI-2.

IC Role / Device Role / Timing Role: Converts variable-amplitude TIA output into constant-level PECL data stream with precise LOS assertion.

Use Value: Enables reliable link initialization and fault reporting via TTL-compatible LOS outputs tied to host controller GPIOs.

Use Scenario: Signal conditioning stage in 1000BASE-SX/LX optical transceivers.

IC Role / Device Role / Timing Role: Provides jitter-controlled 2.5Gbps PECL output compatible with PHY clock/data recovery circuits.

Use Value: Delivers 11ps deterministic jitter and 100–150ps edge speed - meets IEEE 802.3z eye mask requirements without post-equalization.

Small-Form-Factor (SFF) Transceiver

Optical Interconnect Backplane

Use Scenario: Core limiting amplifier in SFF-8472-compliant modules with digital diagnostics.

IC Role / Device Role / Timing Role: Generates LOS status and drives PECL data to host serializer/deserializer.

Use Value: Exposed paddle thermal design supports continuous operation at 70°C ambient - critical for sealed SFF housings.

Use Scenario: High-speed board-to-board optical interconnect using VCSEL-based links.

IC Role / Device Role / Timing Role: Amplifies low-swing differential signals from short-reach optical receivers before retiming.

Use Value: 49dB gain and 10–1200mV input range accommodate signal degradation over FR4 traces and multimode fiber.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3268CUB	Identical 10-pin µMAX-EP PECL limiting amplifier; same 2.5Gbps data rate, 11ps jitter, and LOS architecture.	No functional difference; MAX3268CUB is functionally identical to MAX3269CUB per Maxim's Selector Guide.	Select MAX3268CUB only if legacy documentation or inventory systems reference that part number; pinout, biasing, and layout are interchangeable.
MAX3768CUB	Same package and PECL interface, but rated for extended temperature (−40°C to +85°C) and includes internal SQUELCH tied to V_CC.	Supports industrial/outdoor optical modules; internal squelch enables automatic mute on LOS - not available in MAX3269CUB.	Choose MAX3768CUB when operating outside 0°C–+70°C or requiring always-enabled squelch; MAX3269CUB remains optimal for commercial-grade SFF receivers.

Compared with MAX3268CUB (identical spec) and MAX3768CUB (extended temp + enabled squelch), the MAX3269CUB offers the lowest-cost path for standard 0°C–+70°C SFF designs where squelch is unused, with guaranteed 11ps jitter and 4.4dB LOS hysteresis at +25°C.

Availability

MAX3269CUB is available at Aetrix Electronics and suitable for Fibre Channel optical receivers, Gigabit Ethernet transceivers, and small-form-factor (SFF) modules requiring stable component supply, consistent PECL output performance, and qualified lead-free packaging.

Supply support for MAX3269CUB 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, with deep expertise in high-speed optical interface solutions.

The MAX3269CUB belongs to Maxim's high-speed limiting amplifier product line, engineered specifically for optical receiver front-ends in Fibre Channel and Gigabit Ethernet systems where jitter, LOS accuracy, and PECL compatibility are critical.

FAQ

What is the maximum data rate supported by the MAX3269CUB?

The MAX3269CUB supports a maximum data rate of 2.5Gbps, validated for use in Fibre Channel 2x and Gigabit Ethernet optical receiver applications. This rating is specified across the full operating temperature range (0°C to +70°C) and confirmed by deterministic jitter measurements using the K28.5 test pattern per ANSI X3.230.

Does the MAX3269CUB include a squelch function?

No, the MAX3269CUB does not implement squelch functionality. Per the datasheet Pin Description section, the SQUELCH pin is internally unconnected in the 10-pin µMAX package variants including MAX3269CUB. Squelch is only active in MAX3765/MAX3768 parts where it is tied to V_CC, or in TSSOP versions where it is externally controllable.

What is the recommended termination for the MAX3269CUB PECL outputs?

The MAX3269CUB PECL outputs (OUT+, OUT−) must be terminated to V_CC − 2V using 50Ω resistors per leg, as shown in Figure 1(c) of the datasheet. This termination ensures correct DC biasing, minimizes reflections, and guarantees output voltage levels of −0.880V (high) and −1.620V (low) referenced to V_CC.

How is loss-of-signal (LOS) threshold programmed on the MAX3269CUB?

The LOS threshold on the MAX3269CUB is programmed by connecting an external resistor (R_TH) between the TH pin and ground. Values from 2.5kΩ to 20kΩ set low/medium/high assert levels (e.g., 2.5kΩ → 4.8mV); hysteresis is fixed at 2.2–4.4dB and varies with R_TH per the Typical Operating Characteristics graph TOC19.

Is the exposed paddle on the MAX3269CUB package required to be grounded?

Yes, the exposed paddle (EP) on the MAX3269CUB µMAX-EP package must be soldered to the PCB ground plane. It serves as both the primary thermal dissipation path and the electrical ground reference for internal circuitry. Failure to connect EP results in excessive junction temperature and potential parametric shift or reliability failure.

MAX3269CUB Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

Type:: Limiting Amplifier

Applications:: Optical Networks

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 10-uMAX-EP

MAX3269CUB FAQ

1.How can I place an order for MAX3269CUB through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX3269CUB 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 MAX3269CUB reliable?

The price and inventory of MAX3269CUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3269CUB is usually 5 days.

3.What payment methods are accepted for MAX3269CUB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3269CUB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3269CUB?

MAX3269CUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX3269CUB 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 MAX3269CUB?

For technical support, including MAX3269CUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3269CUB requirements.

6.How does Aetrix verify that MAX3269CUB is sourced from the original manufacturer or authorized distributors?

All MAX3269CUB 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 MAX3269CUB meets industry standards.

7.What is the process for return or replacement of MAX3269CUB?

All MAX3269CUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX3269CUB, 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 MAX3269CUB part is unused and in its original packaging.

Return procedure for MAX3269CUB:

1.Submit a request within 90 days.

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

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