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Analog Devices Inc./Maxim Integrated MAX3263CAG
- Part No.:
- MAX3263CAG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Laser Drivers
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX3263CAG.pdf
- Description:
- IC LASER CTRL 155MBPS 5.25V SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,104
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Product details
Overview
MAX3263CAG from Maxim Integrated is a single +5V-powered, 155Mbps laser diode driver with differential PECL inputs, complementary modulation outputs (OUT+/OUT−), automatic power control (APC), and temperature-compensated reference voltage (VREF1/VREF2). It delivers programmable bias current up to 60mA and modulation current up to 30mA, enabling precise optical transmitter control in SDH/SONET and ATM systems.
For engineers reviewing the MAX3263CAG datasheet, MAX3263CAG pinout, MAX3263CAG application, or MAX3263CAG equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative options, and supply-ready procurement support at Aetrix Electronics.
Technical Context
The MAX3263CAG integrates three functional blocks: a temperature-compensated bandgap reference generator (VREF1/VREF2), a laser bias block with 40× current-mirror gain (IBIASOUT = 40 × (IBIASSET + IBIASFB)), and a high-speed modulation driver with 20× current-mirror gain (IMOD = 20 × IMODSET). Its APC loop uses transconductance amplification and photodiode feedback via IPIN/IPINSET to maintain constant optical output power.
It accepts differential PECL inputs (VIN+/VIN−) with 1100mVp-p minimum swing, drives 25Ω loads at OUT+/OUT−, and features TTL-compatible enable inputs (ENB+/ENB−) with defined truth table behavior. The slow-start circuit (SLWSTRT) sets startup time via external capacitor, and OSADJ adjusts overshoot by tuning input buffer bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.75V to +5.25V - supports standard 5V rail with ±2.5% tolerance; VCCA and VCCB must be separately bypassed. |
| Modulation Current Range | Up to 30mA - set via IMODSET resistor; enables 155Mbps NRZ signaling into 25Ω load with <1ns rise/fall times. |
| Laser Bias Current Range | Up to 60mA - set via IBIASSET resistor; combined with IBIASFB for APC adjustment up to ±40mA around setpoint. |
| Differential Input Swing | ≥1100mVp-p - required minimum for reliable PECL-level switching; corresponds to 550mVp-p per input line. |
| Rise/Fall Time | 1ns (typ.) - measured 10%–90%, ensures signal integrity at 155Mbps with minimal jitter and edge aberration. |
| Operating Temperature | 0°C to +70°C - specified performance range for commercial-grade optical transmitters; no derating required within this span. |
| Reference Voltage | 3.3V (typ.) - temperature-compensated VREF1/VREF2 output used to program all current-setting resistors. |
Pinout & Package
MAX3263CAG is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, optimized for high-frequency laser driver layout. GNDA/GNDB pins are segregated to isolate analog bias/modulation grounds from reference/APC grounds, minimizing noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 10, 9 | ENB+, ENB− | Complementary TTL enable inputs - both must be asserted (ENB+ high, ENB− low) to activate laser output currents. |
| 5, 6 | VIN+, VIN− | Differential PECL data inputs - require 50Ω termination to (VCC − 2V); minimum 1100mVp-p swing needed. |
| 20, 18 | OUT+, OUT− | Complementary modulation current outputs - sink IMOD into laser cathode/anode; load = 25Ω to VCC. |
| 16, 17, 19, 21 | IBIASOUT, GNDA | Laser bias current output and dedicated analog ground - GNDA pins must be tied to low-inductance ground plane. |
| 23, 2 | IPIN, IPINSET | Photodiode anode input and APC current programming - forms closed-loop bias control with IBIASFB and transconductance amplifier. |
| 12, 11, 13 | VREF2, OSADJ, VREF1 | Temperature-stabilized reference outputs and overshoot-adjust input - VREF1/VREF2 are internally connected; OSADJ tunes input stage bias. |
| 14, 15 | IBIASSET, IMODSET | Laser bias and modulation current programming inputs - connect to VREF via precision resistors to set IBIAS and IMOD. |
| 3 | FAILOUT | Open-collector TTL fail indicator - asserts low when photodiode current drops below threshold (VPIN < 2.6V), requiring 2.7kΩ pull-up to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power Control (APC) | Enables stable optical output over temperature and laser aging using only two external resistors (IPINSET, IBIASSET) and photodiode feedback. |
| Temperature-Compensated Reference | VREF1/VREF2 outputs track with 2VBE compensation, canceling mirror drift to hold IBIAS/IMOD stable across 0°C to +70°C. |
| Programmable Slow-Start | SLWSTRT pin allows tSTARTUP = 25.4kΩ × (CSLWSTRT + 2pF); preset to 50ns with no capacitor, preventing laser turn-on surge damage. |
| Fail-Safe Laser Monitoring | FAILOUT open-collector output signals laser failure (e.g., broken fiber or dead diode) when IPIN node voltage falls below 2.6V. |
| Overshoot Adjustment | OSADJ pin lets designers tune input buffer bias current to reduce modulation edge overshoot without sacrificing rise time. |
Applications
| 155Mbps SDH/SONET Transmitters | 155Mbps ATM Optical Links |
|---|---|
|
Use Scenario: Transmitting OC-3/STM-1 data frames over single-mode fiber in telecom central office equipment. IC Role / Device Role / Timing Role: Laser diode driver providing precise bias and modulation current control synchronized to 155.52MHz clock domain. Use Value: Enables extinction ratio ≥6dB and pulse-width distortion ≤100ps at full rate, meeting GR-253-CORE jitter and eye-mask compliance. |
Use Scenario: Edge-node ATM cell transport in metro access networks with burst-mode traffic patterns. IC Role / Device Role / Timing Role: High-speed modulation driver with fast enable/disable (ENB+/ENB−) supporting cell-based power gating. Use Value: Delivers 30mA peak modulation current with <1ns edges, sustaining BER <10−12 under variable load conditions. |
| Fiber-to-the-Home (FTTH) ONU Modules | Industrial Fiber-Optic Data Links |
|
Use Scenario: Downstream optical transmission in GPON/EPON optical network units operating at room temperature. IC Role / Device Role / Timing Role: Integrated APC-enabled laser driver maintaining constant average power despite ambient temperature shifts (0°C to +70°C). Use Value: Uses internal VREF and IBIASFB feedback to hold optical output within ±0.5dB over life, eliminating manual calibration. |
Use Scenario: Real-time sensor data transmission in factory automation systems using ruggedized fiber interconnects. IC Role / Device Role / Timing Role: Robust laser driver with FAILOUT monitoring and slow-start protection against ESD-induced latch-up during field deployment. Use Value: Provides fail-safe diagnostics and 50ns soft-start to prevent laser degradation in unattended industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar laser diode driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3265CAG | Higher speed: 622Mbps operation; same 24-pin SSOP package and APC architecture but requires ≥1.8V differential input swing. | Targets OC-12/STM-4 systems; not drop-in compatible due to stricter input drive requirements and different OSADJ scaling. | Select MAX3265CAG only when upgrading to 622Mbps while retaining APC and thermal stability - verify PECL driver capability. |
| LMH6521MA/NOPB | Wideband current-output DAC-based driver; no integrated APC or temperature-compensated reference; 3.3V-only supply. | Suitable for custom-designed transmitters with external microcontroller-based APC; lacks FAILOUT and slow-start safety features. | Choose LMH6521MA/NOPB for flexible, software-controlled bias/modulation where MAX3263CAG's integrated analog loop is unnecessary. |
Compared with MAX3263CAG, MAX3265CAG extends data rate to 622Mbps but increases input drive demand, while LMH6521MA/NOPB trades integration for programmability - neither offers identical APC simplicity, 5V operation, or fail-safe monitoring in a single chip.
Availability
MAX3263CAG is available at Aetrix Electronics and suitable for 155Mbps SDH/SONET transmitters, FTTH optical network units, and industrial fiber-optic data links requiring stable component supply across extended product lifecycles.
Supply support for MAX3263CAG 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, industrial, and computing applications, with emphasis on high-reliability, low-power, and thermally robust solutions.
The MAX3263CAG belongs to Maxim's optical communications driver product line, engineered specifically for cost-sensitive, high-volume 155Mbps laser transmitter modules requiring integrated APC, fail-safe monitoring, and single-supply operation.
FAQ
What is the absolute maximum laser bias current output of the MAX3263CAG?
The MAX3263CAG specifies an absolute maximum IBIASOUT of 75mA. This limit applies regardless of programming method - whether set solely by IBIASSET or adjusted via IBIASFB in APC mode. Exceeding 75mA risks permanent damage to the output stage. For reliable operation, keep total programmed bias current ≤60mA as characterized, with headroom for APC correction.
Does the MAX3263CAG support both PECL and TTL input logic families?
The MAX3263CAG accepts differential PECL inputs (VIN+/VIN−) with defined VIH/VIL thresholds relative to VCC, but its enable inputs (ENB+/ENB−) are TTL-compatible. It does not accept single-ended TTL data inputs directly - PECL termination (e.g., Thevenin-equivalent) is required for data signals. The device lacks internal level-shifting for non-PECL data sources.
How does the MAX3263CAG implement automatic power control (APC)?
The MAX3263CAG implements APC using a transconductance amplifier that compares photodiode current (fed into IPIN) against a reference set by IPINSET. Feedback current (IBIASFB) is generated and summed with IBIASSET to adjust laser bias dynamically. This closed loop maintains constant optical output power across temperature and aging, requiring only two external resistors and a monitor photodiode.
Can the MAX3263CAG operate with separate 3.3V and 5V supplies?
No - the MAX3263CAG is specified exclusively for +4.75V to +5.25V operation. Both VCCA and VCCB must be tied to the same +5V rail, though they require independent 0.01µF bypass capacitors. Using 3.3V violates absolute maximum ratings and disables internal reference generation, rendering VREF1/VREF2, APC, and current mirrors nonfunctional.
What is the purpose of the OSADJ pin on the MAX3263CAG?
The OSADJ pin on the MAX3263CAG adjusts the bias current of the input buffer stage to control overshoot and ringing in the modulation waveform. Connecting OSADJ to VREF through a resistor (e.g., 5.6kΩ for 12mA IMOD) reduces edge aberrations while preserving rise time - critical for meeting SONET eye-mask requirements without external filtering.
MAX3263CAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Laser Diode Controller (Fiber Optic)
- Data Rate:
- 155Mbps
- Number of Channels:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 50 mA
- Current - Modulation:
- 30mA
- Current - Bias:
- 60 mA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-SSOP
- Mounting Type:
- Surface Mount
MAX3263CAG FAQ
1.How can I place an order for MAX3263CAG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3263CAG 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 MAX3263CAG reliable?
The price and inventory of MAX3263CAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3263CAG is usually 5 days.
3.What payment methods are accepted for MAX3263CAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3263CAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3263CAG?
MAX3263CAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3263CAG 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 MAX3263CAG?
For technical support, including MAX3263CAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3263CAG requirements.
6.How does Aetrix verify that MAX3263CAG is sourced from the original manufacturer or authorized distributors?
All MAX3263CAG 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 MAX3263CAG meets industry standards.
7.What is the process for return or replacement of MAX3263CAG?
All MAX3263CAG units undergo pre-shipment inspection (PSI). If there is an issue with MAX3263CAG, 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 MAX3263CAG part is unused and in its original packaging.
Return procedure for MAX3263CAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX3263CAG Tags
-
EPC21701
EPC
-
EPC21601
EPC
-
MAX3799ETJ+T
Analog Devices Inc./Maxim Integrated
-
AD9665ACPZ-REEL7
Analog Devices Inc.
-
MAX3740AETG+T
Analog Devices Inc./Maxim Integrated
-
MAX3795ETG+
Analog Devices Inc./Maxim Integrated
-
EPC21603
EPC
-
ONET8501VRGPT
Texas Instruments
-
MAX3738ETG+T
Analog Devices Inc./Maxim Integrated
-
SY88022ALMG-TR
Microchip Technology
-
ISL78365ARZ-T7A
Renesas
-
EPC21603ENGRT
EPC
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