Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Analog Devices Inc./Maxim Integrated MAX3269CUB+T

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

Compare

Part No.:: MAX3269CUB+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Special Purpose Amplifiers

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

Datasheet:: MAX3269CUB+T.pdf

Description:: IC LIMITING AMP 10UMAX

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,469

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MAX3269CUB+T from Maxim Integrated is a 2.5Gbps PECL-output limiting amplifier for optical receiver front-ends in Fibre Channel and Gigabit Ethernet systems. It features programmable loss-of-signal detection (LOS), low deterministic jitter (11ps p-p), 100–155ps edge speed, 49dB gain, and operates from +3.0V to +5.5V supply. Its 10-pin µMAX-EP package supports compact SFF receiver designs.

For engineers reviewing the MAX3269CUB+T datasheet, MAX3269CUB+T pinout, MAX3269CUB+T application, or MAX3269CUB+T equivalent, this page delivers verified electrical specs, PECL termination guidance, LOS threshold programming via R_TH, offset-correction capacitor selection, and real-world jitter performance at 2.5Gbps under varying input amplitudes.

Technical Context

The MAX3269CUB+T implements a multistage limiting amplifier with RMS power detection and integrated DC offset correction using external CAZ1/CAZ2 capacitors. Its PECL output stage is designed for V_CC − 2V termination and exhibits 85–115Ω single-ended output resistance.

Unlike CML variants (e.g., MAX3265), the MAX3269CUB+T uses standards-compliant positive-referenced ECL logic, lacks an externally controllable SQUELCH pin (internally unconnected), and relies on internal 8kΩ pull-ups on LOS outputs-enabling TTL-compatible signal-detect reporting without external biasing.

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 with K28.5 pattern; enables robust eye opening at 2.5Gbps.
Input Voltage Range	10mV to 1200mV (differential p-p) - accommodates wide dynamic range from transimpedance amplifiers like MAX3266/MAX3267.
LOS Hysteresis	2.2dB to 4.4dB - set by R_TH value; provides stable optical signal detect with 2.2dB optical hysteresis.
Output Edge Speed	100ps to 155ps - ensures fast transitions while maintaining controlled slew for EMI and signal integrity.
Supply Voltage	+3.0V to +5.5V - allows direct interface with common 3.3V or 5V system rails without regulation.
Power-Supply Current	50mA to 76mA - measured at V_CC = +3.3V, TA = +25°C; scales with data rate and termination load.

Pinout & Package

MAX3269CUB+T is housed in a 10-pin µMAX-EP package (3.0mm × 3.0mm, 0.8mm height) with exposed paddle soldered to PCB ground for thermal management.

Pin/Terminal	Circuit Role	Design Meaning
1, 4	GND	Ground reference for analog core and exposed paddle thermal path.
2	IN+	Noninverted differential input; 100Ω input impedance matched to TIA outputs.
3	TH	Loss-of-signal threshold setting node; connects to ground via R_TH (e.g., 2.5kΩ for 2.2mV assert level).
5	IN−	Inverted differential input; completes 100Ω differential pair with IN+.
6	CAZ1	Offset-correction loop capacitor terminal; used with CAZ2 to stabilize DC operating point.
7, 10	V_CC	Positive supply rail; decoupling required near pins for high-frequency stability.
8	LOS	Inverted loss-of-signal output; TTL-low when input signal exceeds threshold; internally pulled up to V_CC via 8kΩ.
9	OUT−	Inverted PECL data output; requires termination to V_CC − 2V for proper logic levels.
13	OUT+	Noninverted PECL data output; complements OUT− for differential signaling into 50Ω transmission lines.
14	LOS	Noninverted loss-of-signal output; TTL-high when input signal exceeds threshold.

Key Features

Feature	Design Value
PECL Output Interface	Standards-compliant +V_CC-referenced ECL outputs enable direct connection to FPGA/CPLD PECL receivers without level-shifting.
Programmable LOS Threshold	R_TH-based threshold adjustment (2.2–41.5mV range) allows precise optical power detection across temperature and process variation.
Low Input-Referred Noise	230µV_RMS - minimizes contribution to total system noise floor in high-sensitivity optical receivers.
Integrated Offset Correction	External CAZ1/CAZ2 capacitor network suppresses <100µV input offset, reducing deterministic jitter and duty-cycle distortion.
Robust Power-Supply Rejection	20dB PSRR below 2MHz - maintains signal integrity despite switching noise on shared V_CC rails.

Applications

Gigabit Ethernet Optical Receiver	Fibre Channel Optical Receiver
Use Scenario: Front-end limiting amplifier in SFP modules receiving 1.25Gbps or 2.5Gbps optical signals after PIN diode and transimpedance amplification. IC Role / Device Role / Timing Role: Signal conditioning and amplitude limiting stage that restores digital eye integrity prior to clock/data recovery. Use Value: 11ps deterministic jitter and 100–155ps edge speed ensure >30% eye opening at 2.5Gbps under worst-case input conditions.	Use Scenario: Embedded in FC-AL or FC-2 compliant optical receivers for storage area networks requiring 2.125Gbps operation. IC Role / Device Role / Timing Role: High-gain (49dB), low-noise limiting amplifier with programmable LOS for link status monitoring. Use Value: 2.2–4.4dB LOS hysteresis prevents false disconnects during optical power fluctuations typical in multimode fiber links.
Small-Form-Factor (SFF) Receiver	ATM Optical Receiver
Use Scenario: Space-constrained 10-pin µMAX footprint used in SFF transceivers where board area is limited to <10mm² per channel. IC Role / Device Role / Timing Role: Compact, thermally optimized PECL limiting amplifier enabling high-density pluggable optics. Use Value: Exposed paddle package reduces junction-to-board thermal resistance to <40°C/W, sustaining 76mA operation at +70°C ambient.	Use Scenario: Line card receiver in ATM OC-3/OC-12 infrastructure handling scrambled NRZ-encoded 155Mbps or 622Mbps signals. IC Role / Device Role / Timing Role: Wide-input-range (10–1200mV) limiting amplifier tolerant of variable preamplifier output swing. Use Value: Programmable CAZ capacitor network (0.1µF option) extends offset-correction low-frequency cutoff to 2kHz, matching ATM data statistics.

Gigabit Ethernet Optical Receiver

Fibre Channel Optical Receiver

Use Scenario: Front-end limiting amplifier in SFP modules receiving 1.25Gbps or 2.5Gbps optical signals after PIN diode and transimpedance amplification.

IC Role / Device Role / Timing Role: Signal conditioning and amplitude limiting stage that restores digital eye integrity prior to clock/data recovery.

Use Value: 11ps deterministic jitter and 100–155ps edge speed ensure >30% eye opening at 2.5Gbps under worst-case input conditions.

Use Scenario: Embedded in FC-AL or FC-2 compliant optical receivers for storage area networks requiring 2.125Gbps operation.

IC Role / Device Role / Timing Role: High-gain (49dB), low-noise limiting amplifier with programmable LOS for link status monitoring.

Use Value: 2.2–4.4dB LOS hysteresis prevents false disconnects during optical power fluctuations typical in multimode fiber links.

Small-Form-Factor (SFF) Receiver

ATM Optical Receiver

Use Scenario: Space-constrained 10-pin µMAX footprint used in SFF transceivers where board area is limited to <10mm² per channel.

IC Role / Device Role / Timing Role: Compact, thermally optimized PECL limiting amplifier enabling high-density pluggable optics.

Use Value: Exposed paddle package reduces junction-to-board thermal resistance to <40°C/W, sustaining 76mA operation at +70°C ambient.

Use Scenario: Line card receiver in ATM OC-3/OC-12 infrastructure handling scrambled NRZ-encoded 155Mbps or 622Mbps signals.

IC Role / Device Role / Timing Role: Wide-input-range (10–1200mV) limiting amplifier tolerant of variable preamplifier output swing.

Use Value: Programmable CAZ capacitor network (0.1µF option) extends offset-correction low-frequency cutoff to 2kHz, matching ATM data statistics.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3268CUB+T	Same 10-pin µMAX-EP package, identical PECL output architecture, but rated for 1.25Gbps data rate and 14ps deterministic jitter.	Suitable for lower-speed Fibre Channel 1x or 1000BASE-SX systems where 2.5Gbps headroom is unnecessary.	Select MAX3268CUB+T when cost sensitivity outweighs need for 2.5Gbps margin and jitter budget is relaxed.
MAX3768CUB+T	Same pinout and PECL interface, but specified over extended industrial temperature range (−40°C to +85°C) and includes internal SQUELCH enable.	Required for outdoor telecom or industrial optical links where ambient temperature exceeds +70°C or automatic squelch is mandatory.	Choose MAX3768CUB+T for extended-temperature deployments or when guaranteed squelch functionality is needed.

Compared with MAX3268CUB+T, the MAX3269CUB+T delivers 3dB higher data rate margin and 3ps lower deterministic jitter at 2.5Gbps; versus MAX3768CUB+T, it trades extended temperature rating and internal squelch for lower unit cost and optimized performance at commercial-grade ambient.

Availability

MAX3269CUB+T is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel storage interconnects, and small-form-factor transceiver modules requiring stable component supply, consistent lead-time visibility, and long-term lifecycle support.

Supply support for MAX3269CUB+T 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 MAX326x family targets high-speed optical receiver front-ends, delivering low-jitter limiting amplifiers with programmable signal-detect and flexible output interfaces (CML or PECL) for GBIC, SFP, and SFF modules.

FAQ

What is the maximum supported data rate for MAX3269CUB+T?

The MAX3269CUB+T is specified for 2.5Gbps operation, supporting full-rate Fibre Channel 2x (2.125Gbps) and Gigabit Ethernet (1.25Gbps) with margin. Electrical characteristics-including deterministic jitter (11ps p-p), edge speed (100–155ps), and input voltage range (10–1200mV)-are guaranteed at 2.5Gbps per the datasheet's ELECTRICAL CHARACTERISTICS table.

Does MAX3269CUB+T include a functional SQUELCH pin?

No. The MAX3269CUB+T does not implement an active SQUELCH function: its SQUELCH pin is internally unconnected per the Pin Description section. Unlike MAX3264/MAX3265, the MAX3269CUB+T relies solely on LOS assertion for signal-loss indication and does not force static output levels during low-input conditions.

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

The LOS threshold on MAX3269CUB+T is set by an external resistor R_TH connected between the TH pin and ground. Values from 2.5kΩ (2.2mV assert level) to 20kΩ (18.0mV assert level) configure the input voltage threshold, with hysteresis ranging from 2.2dB to 4.4dB. This R_TH-based method enables precise optical power detection without trimming.

What is the recommended termination for MAX3269CUB+T PECL outputs?

MAX3269CUB+T PECL outputs must be terminated to V_CC − 2V using 50Ω resistors per leg (Figure 1c). This matches the standard PECL specification and ensures correct logic levels: OUT+ ≈ V_CC − 0.88V (high) and OUT− ≈ V_CC − 1.62V (low). AC-coupling is permitted but requires DC bias restoration at the receiver.

Can MAX3269CUB+T be used with transimpedance amplifiers like MAX3266 or MAX3267?

Yes. The MAX3269CUB+T is explicitly designed to interface with MAX3266 and MAX3267 transimpedance amplifiers. Its 100Ω differential input impedance, 10–1200mV input range, and DC-coupling compatibility (with CAZ1/CAZ2 stabilization) match the output characteristics of those TIAs, forming a complete optical receiver front-end chain.

MAX3269CUB+T 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:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Limiting Amplifier

Applications:: Optical Networks

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 10-uMAX-EP

MAX3269CUB+T FAQ

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

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

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

3.What payment methods are accepted for MAX3269CUB+T?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3269CUB+T?

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

Once your MAX3269CUB+T 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+T?

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

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

All MAX3269CUB+T 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+T meets industry standards.

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

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

Return procedure for MAX3269CUB+T:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…