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Analog Devices Inc./Maxim Integrated MAX3269CUB+
- 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:
- Payment:
- Shipping:
Inventory:3,278
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Product details
Overview
MAX3269CUB+ 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 (LOS) detection with 4.4dB hysteresis, 11ps deterministic jitter, 100–150ps edge speed, 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+ datasheet, MAX3269CUB+ pinout, MAX3269CUB+ application, or MAX3269CUB+ equivalent, this page delivers verified electrical specs, validated PECL interface behavior, confirmed LOS threshold programming via RTH, and real-world design constraints for optical receiver signal integrity and power management.
Technical Context
The MAX3269CUB+ implements a multistage limiting amplifier with RMS power detection and offset-correction loop using external CAZ1/CAZ2 capacitors. Its PECL output stage is internally referenced to VCC − 2V and requires matched 50Ω termination to that voltage rail.
It accepts differential input signals from transimpedance amplifiers (e.g., MAX3266/MAX3267), provides 49dB gain, and uses a 2.5kΩ–20kΩ resistor on TH pin to set LOS assert thresholds from 2.2mV to 41.5mV. The SQUELCH function is unconnected in this 10-pin µMAX variant.
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 | 11psp-p - ensures timing margin compliance in high-speed serial links with K28.5 pattern |
| Input Voltage Range | 10mV to 1200mVpp - accommodates wide dynamic range from optical preamplifiers |
| LOS Hysteresis | 2.2dB to 4.4dB - prevents false LOS toggling during optical power fluctuations |
| Output Edge Speed | 100ps to 150ps - meets eye diagram opening requirements for 2.5Gbps NRZ data |
| Supply Voltage | +3.0V to +5.5V - enables direct integration with common 3.3V or 5V system rails |
| Power-Supply Current | 50mA to 76mA - defines thermal budget and PCB layout for µMAX-EP thermal pad grounding |
Pinout & Package
MAX3269CUB+ uses a 10-pin µMAX-EP package (3.0mm × 3.0mm, 0.5mm pitch) with exposed paddle soldered to ground for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VCC | Positive supply input - must be decoupled locally with ≥0.1µF ceramic capacitor |
| 3 | IN− | Inverted differential input - forms 100Ω differential impedance with IN+ |
| 4 | IN+ | Noninverted differential input - DC-coupling prohibited to preserve offset correction |
| 5 | TH | LOS threshold programming node - sets input amplitude threshold via external resistor to GND |
| 6 | GND | Ground reference - connects to exposed paddle; critical for jitter and thermal stability |
| 7, 8 | OUT−, OUT+ | PECL differential outputs - require 50Ω termination to VCC − 2V for proper logic levels |
| 9 | LOS | Noninverted loss-of-signal indicator - TTL-compatible open-collector output with 8kΩ internal pullup |
| 10 | GND | Secondary ground terminal - ties to same ground plane as pin 6 and exposed paddle |
Key Features
| Feature | Design Value |
|---|---|
| PECL Output Interface | Standards-compliant output referenced to VCC − 2V - eliminates need for external level-shifting in SFF modules |
| Programmable LOS Threshold | RTH-based configuration (2.5kΩ–20kΩ) - enables precise optical power detection across temperature and process variation |
| Low Deterministic Jitter | 11psp-p at 2.5Gbps - directly supports BER <10−12 in production optical receivers |
| Integrated Offset Correction | External CAZ1/CAZ2 capacitor network - reduces input offset to <100µV, preserving RMS power detector accuracy |
| 10-Pin µMAX-EP Package | 3.0mm × 3.0mm footprint with exposed thermal paddle - enables high-density placement in space-constrained SFF receivers |
Applications
| Fibre Channel 2x Receiver | Gigabit Ethernet Optical Module |
|---|---|
Use Scenario: Front-end limiting amplifier in 2.125Gbps Fibre Channel SFF transceivers receiving signals from PIN diode + TIA stages. IC Role / Device Role / Timing Role: Signal conditioning and amplitude limiting with precise LOS assertion for link status monitoring. Use Value: 4.4dB LOS hysteresis prevents false disconnects during transient optical power dips; 11ps jitter preserves eye opening at 2.125Gbps. | Use Scenario: Limiting stage in 1000BASE-SX/LX GBIC modules interfacing with multimode/single-mode fiber. IC Role / Device Role / Timing Role: Converts low-amplitude differential current-mode signals into robust PECL logic for MAC interface. Use Value: 49dB gain and 100–1200mVpp input range accommodate varying TIA output swings; PECL outputs drive backplane traces directly. |
| Small-Form-Factor (SFF) Transceiver | Optical Interconnect Backplane |
Use Scenario: Core limiting amplifier in hot-pluggable SFF modules where board area and thermal dissipation are constrained. IC Role / Device Role / Timing Role: High-speed signal regeneration with integrated LOS reporting and minimal external components. Use Value: 10-pin µMAX-EP package saves >40% board area vs. TSSOP; exposed paddle enables ≤40°C/W junction-to-board thermal resistance. | Use Scenario: Point-to-point optical interconnect between line cards in telecom chassis requiring deterministic latency. IC Role / Device Role / Timing Role: Signal retiming and amplitude normalization before clock/data recovery (CDR) stage. Use Value: 100–150ps edge speed ensures clean transitions into CDR inputs; low PSRR (20dB @ <2MHz) rejects power rail noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3268CUB+ | Same 10-pin µMAX-EP package, identical PECL output architecture, but rated for 1.25Gbps only | Not suitable for 2.5Gbps Fibre Channel or Gigabit Ethernet; lower gain (55dB) and higher jitter (14ps) | Select MAX3268CUB+ only for cost-sensitive 1.25Gbps legacy designs where 2.5Gbps headroom is unnecessary |
| MAX3768CUB+ | Same pinout and PECL interface, but includes internal SQUELCH tied to VCC (not unconnected like MAX3269CUB+) | Enables automatic squelch without host control; not drop-in replaceable due to functional pin difference on SQUELCH | Choose MAX3768CUB+ when squelch activation must be autonomous; verify host logic compatibility with always-enabled squelch |
Compared with MAX3268CUB+, MAX3269CUB+ delivers 2.5Gbps capability and lower jitter, while MAX3768CUB+ adds integrated squelch control-neither is pin-compatible due to differing SQUELCH implementation, requiring layout review for substitution.
Availability
MAX3269CUB+ is available at Aetrix Electronics and suitable for Fibre Channel optical receivers, Gigabit Ethernet modules, and small-form-factor transceivers requiring stable component supply, long-term lifecycle support, and lead-free compliance.
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.
The MAX326x family targets high-speed optical receiver front-ends, delivering low-jitter limiting amplifiers with programmable LOS and flexible output interfaces for GBIC, SFF, and SFP module designs.
FAQ
What is the maximum data rate supported by the MAX3269CUB+?
The MAX3269CUB+ supports up to 2.5Gbps operation, validated per ANSI X3.230 for deterministic jitter measurement using K28.5 patterns. This makes it suitable for Fibre Channel 2x (2.125Gbps) and Gigabit Ethernet (1.25Gbps) applications, with headroom for margin and process variation. The MAX3269CUB+ is not rated for 10Gbps or higher data rates.
How is loss-of-signal (LOS) threshold programmed on the MAX3269CUB+?
The LOS threshold on the MAX3269CUB+ is programmed using an external resistor (RTH) connected between the TH pin and ground. Values from 2.5kΩ to 20kΩ set assert thresholds from 2.2mV to 41.5mV differential input amplitude. The MAX3269CUB+ uses an 8kΩ internal pullup on the LOS output, and its hysteresis is specified at 4.4dB typical.
Does the MAX3269CUB+ include a squelch function?
No, the MAX3269CUB+ does not implement the squelch function. Per the datasheet pin description, the SQUELCH pin is unconnected in the 10-pin µMAX package variants including MAX3269CUB+. Unlike MAX3768CUB+, which ties SQUELCH internally to VCC, the MAX3269CUB+ provides only LOS indication without output muting capability.
What is the correct termination for the PECL outputs of the MAX3269CUB+?
The PECL outputs (OUT+ and OUT−) of the MAX3269CUB+ must be terminated to VCC − 2V using two 50Ω resistors-one from each output to VCC − 2V. This matches the standard PECL interface requirement and ensures valid logic levels (−0.88V to −1.81V referenced to VCC). AC coupling is permitted but requires careful attention to common-mode bias.
What package type and thermal considerations apply to the MAX3269CUB+?
The MAX3269CUB+ uses a 10-pin µMAX-EP package (3.0mm × 3.0mm) with an exposed paddle that must be soldered to a solid ground plane. Thermal resistance is specified at 1600mW max power dissipation at +70°C ambient, derating 20mW/°C above that. Proper paddle grounding is mandatory to meet jitter and reliability specifications.
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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