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Analog Devices Inc./Maxim Integrated MAX3265CUE+
- Part No.:
- MAX3265CUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX3265CUE+.pdf
- Description:
- IC LIMITING AMP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,998
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Product details
Overview
MAX3265CUE+ from Maxim Integrated is a 2.5Gbps CML-output limiting amplifier designed for high-speed optical receiver front-ends in Fibre Channel and Gigabit Ethernet systems. It features programmable loss-of-signal (LOS) detection with RTH-based threshold setting, 11ps deterministic jitter (typ), 100–150ps edge speed, and operates from +3.0V to +5.5V supply. Its role is to condition low-amplitude differential input signals from transimpedance amplifiers (e.g., MAX3266/MAX3267) into clean, constant-level CML data outputs.
For engineers reviewing the MAX3265CUE+ datasheet, MAX3265CUE+ pinout, MAX3265CUE+ application, or MAX3265CUE+ equivalent, key selection criteria include its 16-pin TSSOP-EP package, CML output compatibility with inductive connectors, RMS power detection with hysteresis, squelch control via SQUELCH pin, and guaranteed performance across 0°C to +70°C ambient temperature.
Technical Context
The MAX3265CUE+ implements a multistage limiting amplifier with 49dB total gain and integrated offset-correction loop using external CAZ1/CAZ2 capacitors. Its RMS power detector compares input signal amplitude against a TH-pin–set threshold to drive complementary LOS outputs with 2.2–4.4dB hysteresis.
It uses current-mode logic (CML) output buffers tolerant of impedance mismatches, with LEVEL pin selectable output current (16mA open, 20mA grounded). The device accepts 10–1200mVpp differential input voltage and delivers controlled-edge outputs optimized for GBIC receiver modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 2.5Gbps - supports full-rate Fibre Channel 2x and Gigabit Ethernet 2.5G PHY layers. |
| Deterministic Jitter | 11ps (typ) - ensures timing margin compliance in high-speed serial links with K28.5 pattern. |
| Input Voltage Range | 10–1200mVpp differential - accommodates wide dynamic range from TIAs without saturation. |
| LOS Hysteresis | 2.2–4.4dB - provides stable optical signal detect with 2.2dB optical hysteresis (electrical ×2). |
| Output Edge Speed | 100–150ps - meets eye-diagram opening requirements for 2.5Gbps NRZ signaling. |
| Supply Voltage | +3.0V to +5.5V - enables direct interface with common 3.3V or 5V system rails. |
| Differential Input Resistance | 100Ω (97–103Ω) - matches standard 100Ω transmission lines and TIAs like MAX3266. |
Pinout & Package
MAX3265CUE+ is housed in a 16-pin TSSOP-EP (exposed paddle) package, 4.4mm body width, RoHS-compliant and lead-free. Thermal performance requires soldering the exposed paddle to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 10 | GND | Ground reference for analog core, output buffers, and exposed paddle thermal path. |
| 2, 3, 5, 6, 8, 9, 11–16 | Signal I/O | Includes IN+, IN-, OUT+, OUT-, TH, LOS, LOS, CAZ1, CAZ2, SQUELCH, LEVEL, N.C., VCC. |
| IN+, IN- | Differential Input | 100Ω terminated inputs accepting 10–1200mVpp; DC-coupling prohibited to preserve offset correction. |
| OUT+, OUT- | CML Data Output | Current-mode outputs with 16mA/20mA selectable drive; require 50Ω or 75Ω termination per Figure 1. |
| TH | LOS Threshold Set | Resistor-to-ground sets LOS assert level (e.g., 2.5kΩ → 2.20–4.8mV low-threshold mode). |
| LOS / LOS | Complementary LOS Outputs | TTL-compatible outputs with internal 8kΩ pullups; indicate signal presence/absence with hysteresis. |
| SQUELCH | Output Mute Control | TTL-high enables squelch: forces static OUT+/OUT- levels when input falls below LOS threshold. |
| LEVEL | CML Output Current Select | Open = 16mA; GND = 20mA - adjusts output swing and drive strength for line matching. |
| CAZ1, CAZ2 | Offset Correction Filter | External capacitor between pins sets low-frequency cutoff (2MHz default if open) to minimize DC drift. |
| VCC | Power Supply | +3.0V to +5.5V supply; decoupling required at each VCC pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| CML Output Interface | Tolerant of inductive connectors and impedance mismatches; eliminates need for precise AC coupling or termination tuning. |
| Programmable LOS Threshold | Three sensitivity ranges (low/medium/high) set by single external RTH resistor - simplifies optical power calibration. |
| Squelch Function | Hardware-controlled muting of data outputs during signal loss - prevents downstream logic errors in burst-mode receivers. |
| Low Deterministic Jitter | 11ps (typ) at 2.5Gbps - preserves bit-error-rate margin in high-speed serial links with tight timing budgets. |
| Integrated Offset Correction | DC offset reduced to <100µV via CAZ1/CAZ2–controlled feedback loop - maintains accuracy of RMS power detection. |
Applications
| Gigabit Ethernet Optical Receiver | Fibre Channel 2x Receiver |
|---|---|
Use Scenario: Front-end signal conditioning in SFP/SFF pluggable optical transceivers receiving 2.5Gbps NRZ data over multimode fiber. IC Role / Device Role / Timing Role: Limiting amplifier converting low-voltage differential signal from TIA (e.g., MAX3267) into robust CML logic for clock/data recovery. Use Value: Maintains 11ps deterministic jitter and 100–150ps edge speed to meet IEEE 802.3z eye mask requirements at 2.5Gbps. |
Use Scenario: Signal amplification stage in FC-AL or FC-SW optical receivers operating at 2.125Gbps. IC Role / Device Role / Timing Role: High-gain (49dB), low-noise limiting amplifier with RMS-based LOS detection for link integrity monitoring. Use Value: Programmable RTH-based LOS threshold enables precise optical power alarm triggering across varying link budgets. |
| GBIC Module Receiver | ATM OC-48 Optical Interface |
Use Scenario: Core limiting function in GBIC modules compliant with INF-8074i specification. IC Role / Device Role / Timing Role: CML-output amplifier driving serializer or CDR ICs; provides TTL-compatible LOS outputs for host controller monitoring. Use Value: 16-pin TSSOP-EP package and integrated squelch simplify GBIC PCB layout and reduce component count. |
Use Scenario: Optical receiver front-end in SONET/SDH OC-48 (2.488Gbps) line cards requiring deterministic jitter <25ps. IC Role / Device Role / Timing Role: High-speed limiting amplifier with low-input-referred noise (230µVRMS) and Bessel-filtered response. Use Value: 2.5Gbps-rated architecture and 100Ω input impedance ensure compatibility with scrambled NRZ ATM payloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3265CUB+ | Same electrical specs but 10-pin µMAX-EP package; LEVEL internally grounded; SQUELCH unconnected. | Targeted for space-constrained SFF receivers; lacks external squelch control and LEVEL adjustability. | Select MAX3265CUB+ only when board area is critical and fixed 20mA CML drive suffices. |
| MAX3265EUE+ | Identical functionality and pinout, but rated for -40°C to +85°C industrial temperature range. | Required for outdoor telecom, industrial switches, or automotive infotainment optical backplanes. | Choose MAX3265EUE+ when extended temperature operation is mandatory; otherwise MAX3265CUE+ is optimal for commercial-grade GBICs. |
Compared with MAX3265CUB+, MAX3265CUE+ offers full external control of squelch and output current, while MAX3265EUE+ extends ambient operating range without altering interface or performance - making the CUE+ variant ideal for cost-sensitive, temperature-stable commercial optical modules.
Availability
MAX3265CUE+ is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel 2x receivers, and GBIC module designs requiring stable component supply, consistent lead-free packaging, and guaranteed 0°C to +70°C operation.
Supply support for MAX3265CUE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.
The MAX3265CUE+ belongs to Maxim's high-speed optical receiver IC product line, engineered specifically for 2.5Gbps limiting amplification in standards-compliant optical modules with emphasis on jitter performance, LOS reliability, and CML interoperability.
FAQ
What is the operating temperature range for MAX3265CUE+?
The MAX3265CUE+ is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with typical GBIC and SFP module environments. For extended industrial use, consider the MAX3265EUE+ variant, which supports -40°C to +85°C. All electrical characteristics in the MAX3265CUE+ datasheet are guaranteed within its 0°C to +70°C range.
Does MAX3265CUE+ support both CML and PECL outputs?
No, MAX3265CUE+ provides CML outputs only. It belongs to the MAX3265/MAX3765 family, which uses current-mode logic outputs compatible with inductive connectors and 50Ω/75Ω terminations. PECL outputs are exclusive to the MAX3268/MAX3269/MAX3768 series. Attempting to configure MAX3265CUE+ for PECL operation is not supported and will not yield compliant signal levels.
How is loss-of-signal (LOS) threshold programmed on MAX3265CUE+?
The LOS threshold on MAX3265CUE+ is programmed using an external resistor (RTH) connected between the TH pin and ground. Three distinct threshold ranges - low (2.5kΩ), medium (7kΩ), and high (20kΩ) - correspond to different input voltage trip points (e.g., 2.20–4.8mV for low range). The exact assert/deassert levels are documented in the Electrical Characteristics table and validated across temperature.
What is the purpose of the CAZ1 and CAZ2 pins on MAX3265CUE+?
CAZ1 and CAZ2 on MAX3265CUE+ form the external node pair for the offset-correction loop capacitor. Connecting a capacitor (e.g., 0.1µF for NRZ, open for 8B/10B) between them sets the low-frequency cutoff of the DC feedback path, stabilizing input offset below 100µV and minimizing deterministic jitter. Leaving both pins open yields a default 2MHz cutoff suitable for Gigabit Ethernet and Fibre Channel.
Can MAX3265CUE+ be used with transimpedance amplifiers other than MAX3266/MAX3267?
Yes, MAX3265CUE+ is compatible with any transimpedance amplifier delivering a 100Ω differential output and 10–1200mVpp signal swing, including industry-standard alternatives such as the ON Semiconductor NCS2505 or Texas Instruments OPT101 derivatives. Its 100Ω input impedance and wide input range ensure interoperability, provided the TIA's output common-mode voltage remains within MAX3265CUE+'s valid range (VCC − 2.4V to VCC + 0.5V).
MAX3265CUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Limiting Amplifier
- Applications:
- Optical Networks
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP-EP
MAX3265CUE+ FAQ
1.How can I place an order for MAX3265CUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3265CUE+ 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 MAX3265CUE+ reliable?
The price and inventory of MAX3265CUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3265CUE+ is usually 5 days.
3.What payment methods are accepted for MAX3265CUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3265CUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3265CUE+?
MAX3265CUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3265CUE+ 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 MAX3265CUE+?
For technical support, including MAX3265CUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3265CUE+ requirements.
6.How does Aetrix verify that MAX3265CUE+ is sourced from the original manufacturer or authorized distributors?
All MAX3265CUE+ 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 MAX3265CUE+ meets industry standards.
7.What is the process for return or replacement of MAX3265CUE+?
All MAX3265CUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3265CUE+, 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 MAX3265CUE+ part is unused and in its original packaging.
Return procedure for MAX3265CUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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