My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX3861EGG
- Part No.:
- MAX3861EGG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX3861EGG.pdf
- Description:
- IC POSTAMPLIFIER 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX3861EGG from Maxim Integrated is a 2.7Gbps CML post-amplifier with automatic gain control (AGC), designed for WDM optical receivers requiring vertical threshold adjustment after the transimpedance amplifier. It operates from a single 3.3V supply, delivers 400–920mVP-P adjustable differential output swing, maintains ≤0.2dB output variation over 16dB input range, and features on-chip 50Ω input/output termination. Used in OC-48/STM-16 long-reach transmission systems.
For engineers reviewing the MAX3861EGG datasheet, MAX3861EGG pinout, MAX3861EGG application, or MAX3861EGG equivalent, this page provides verified technical context, real-world AGC loop behavior, RSSI linearity specs, deterministic jitter (≤50psP-P), and validated alternative options for optical receiver front-end design.
Technical Context
The MAX3861EGG implements a closed-loop AGC architecture with three independent feedback paths: main signal path offset cancellation (via CZ+/CZ−), input signal detection offset cancellation (via CD+/CD−), and programmable AGC loop time constant (via CG+/CG−). Its SiGe bipolar process enables 3.4GHz small-signal bandwidth and 0.26mVRMS input-referred noise at maximum gain.
It supports CML-compatible 50Ω AC-coupled interfaces on both IN+/IN− and OUT+/OUT−, integrates a linear RSSI output (±2.5% error up to 100mVP-P), and provides programmable SD threshold via external RTH on TH pin with 2.8–6.3dB hysteresis. Output amplitude is controlled by analog voltage (0–2.0V) applied to SC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +3.0V to +3.6V - Single-rail operation compatible with standard 3.3V system rails and LDOs. |
| Small-Signal Bandwidth | 3.4GHz typical - Supports full 2.7Gbps NRZ data with margin for deterministic jitter and frequency-dependent loss. |
| Input Range | 6–1200mVP-P (46dB) - Covers wide dynamic range of post-TIA signals in WDM receivers under varying optical power conditions. |
| Output Swing | 400–920mVP-P adjustable - Matches downstream CDR or limiting amplifier input requirements without external attenuation or amplification. |
| Output Variation | ≤0.2dB over 16dB input change - Ensures stable eye opening and BER performance across link budget variations. |
| RSSI Linearity | ±2.5% up to 100mVP-P - Enables accurate optical power monitoring for closed-loop system control and fault detection. |
| Deterministic Jitter | ≤50psP-P - Meets OC-48/STM-16 jitter budget constraints when used with compliant TIA and clock recovery stages. |
Pinout & Package
MAX3861EGG is housed in a 24-pin QFN-EP package (4mm × 4mm × 0.8mm thin profile) with exposed thermal pad recommended to be soldered to ground for optimal thermal performance and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | CML differential input | On-chip 50Ω termination; accepts AC-coupled post-TIA signals; common-mode level = VCC − 0.3V. |
| OUT+, OUT− | CML differential output | On-chip 50Ω back-termination; drives CDR or limiting amplifier; output swing adjustable via SC pin. |
| TH | Signal detect threshold programming | Resistor-to-ground sets SD assert threshold from 2–100mVP-P; open = minimum threshold. |
| SC | Output amplitude control | Analog voltage (0–2.0V) sets output swing from 400–920mVP-P; connect to VREF for max amplitude. |
| RSSI | Received signal strength indicator | DC voltage linearly proportional to input amplitude (±2.5% up to 100mVP-P); used for optical power monitoring. |
| SD | Signal detect output | Active-low logic output asserting when input falls below programmed TH threshold; includes 2.8–6.3dB hysteresis. |
| CG+, CG− | AGC loop capacitor terminals | External capacitor sets AGC time constant (e.g., 0.0022µF → ~16µs; 0.022µF → ~760µs). |
| CZ+, CZ− | Main path offset cancellation | Capacitor sets low-frequency cutoff of main signal path (e.g., 0.22µF → ~3kHz); critical for NRZ duty-cycle stability. |
| CD+, CD− | SD path offset cancellation | Capacitor sets DC offset cancellation time constant for input detection circuitry (e.g., 0.1µF → <10kHz). |
| VREF | 2.0V reference output | Stable internal reference; directly connects to SC for maximum output swing or used for biasing external circuits. |
| EN | Signal detect enable | High or open enables RSSI/SD; low disables detection circuitry to reduce supply current by ~15mA. |
| OSM | Output signal monitor | DC voltage linearly proportional to output amplitude (0.9–2.0V for 400–920mVP-P); enables closed-loop output calibration. |
| VCC (Pins 2,5,14,17,22) | Power supply | Five dedicated VCC pins minimize IR drop and improve PSNR; all must connect to clean 3.3V plane. |
| GND (Pins 9,12,22) | Ground | Three GND pins plus exposed pad ensure low-inductance return path; exposed pad must be soldered to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.3V supply operation | Eliminates need for dual-rail or negative supplies in optical receiver modules, reducing BOM count and layout complexity. |
| On-chip 50Ω input/output termination | Removes four external 50Ω resistors per channel, preserving signal integrity and simplifying PCB routing for high-speed CML interfaces. |
| Programmable AGC loop time constant | Configurable via external capacitor (CG+/CG−) to match system response time-fast settling for burst-mode links or slow tracking for stable DWDM channels. |
| Integrated RSSI with ±2.5% linearity | Enables precise optical power monitoring without external ADC or scaling circuitry, supporting digital diagnostics (DDMI) compliance. |
| Adjustable output amplitude (400–920mVP-P) | Allows optimization for downstream CDR sensitivity or limiting amplifier headroom without redesigning inter-stage matching networks. |
| Low deterministic jitter (≤50psP-P) | Meets SONET OC-48 jitter transfer and generation requirements, ensuring robust bit-error-rate performance in long-haul links. |
Applications
| OC-48/STM-16 Receivers | WDM Optical Receivers |
|---|---|
|
Use Scenario: Front-end post-amplification stage in SONET/SDH line cards receiving 2.488Gbps signals after TIA. IC Role / Device Role / Timing Role: AGC-controlled CML post-amp providing stable differential output swing to CDR, with RSSI enabling real-time optical power tracking. Use Value: Maintains consistent eye height and timing margin across ±10dB input power variation, reducing BER fluctuations in aging fiber links. |
Use Scenario: Channel-specific amplification in 16-channel DWDM receiver modules with variable per-channel optical power. IC Role / Device Role / Timing Role: Per-channel gain stabilization element that compensates for wavelength-dependent loss and EDFA ripple. Use Value: Enables uniform signal levels across all wavelengths before multiplexing into a common CDR, minimizing channel-to-channel BER disparity. |
| Long-Reach Optical Receivers | Continuous Rate Receivers |
|
Use Scenario: Amplification stage in 80km+ metro links where received optical power varies >20dB due to span loss and connector degradation. IC Role / Device Role / Timing Role: High-linearity AGC amplifier with low input noise (0.26mVRMS) preserving SNR while compressing dynamic range for downstream processing. Use Value: Extends operational reach without manual gain adjustment; RSSI output feeds supervisory microcontroller for predictive maintenance alerts. |
Use Scenario: Signal conditioning in continuous-rate optical interfaces (e.g., Fibre Channel 2G/4G) where data rate is fixed but input amplitude varies with cable length. IC Role / Device Role / Timing Role: Fixed-rate post-amplifier with programmable output swing (SC pin) and deterministic jitter ≤50psP-P meeting FC-PI-3 spec. Use Value: Eliminates need for discrete gain-setting resistors or external attenuators, enabling compact SFP/SFP+ module designs with minimal bill-of-materials. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar post-amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3761ETA+ | Lower bandwidth (2.5GHz), no RSSI, fixed 600mVP-P output, same 24-pin QFN package. | Lacks AGC and signal monitoring; suitable only for static-gain, cost-sensitive short-reach links. | Select when RSSI, programmable output, or wide input dynamic range are not required. |
| LMH6553MA/NOPB | DC-coupled, 3.2GHz bandwidth, no integrated AGC or SD/RSSI; requires external loop components. | Requires discrete AGC implementation; higher layout complexity and calibration effort for optical receiver use. | Choose only if full DC coupling or custom AGC algorithm is mandatory; not drop-in for MAX3861EGG. |
Compared with MAX3861EGG, MAX3761ETA+ offers lower cost and identical footprint but sacrifices AGC flexibility and system monitoring capability, while LMH6553MA/NOPB provides broader DC response at the expense of integration, board area, and design validation effort.
Availability
MAX3861EGG is available at Aetrix Electronics and suitable for OC-48/STM-16 transmission systems, WDM optical receivers, and long-reach optical receiver designs requiring stable component supply, guaranteed lead-free compliance, and extended temperature support (−40°C to +85°C).
Supply support for MAX3861EGG 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for communications, computing, and industrial applications.
The MAX3861EGG belongs to Maxim's optical receiver front-end product line, engineered specifically for high-speed WDM and SONET/SDH systems requiring integrated AGC, low-noise amplification, and diagnostic monitoring functions.
FAQ
What is the operating temperature range for the MAX3861EGG?
The MAX3861EGG is specified for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in telecom line cards, outdoor optical network units, and enterprise datacom equipment where environmental conditions vary significantly. All electrical characteristics in the datasheet-including AGC accuracy, RSSI linearity, and output swing stability-are guaranteed across this full range.
How does the MAX3861EGG achieve automatic gain control without external components?
The MAX3861EGG implements fully integrated AGC using internal feedback loops and on-die comparators. Gain adjustment is performed dynamically by its SiGe core based on input amplitude, with loop response shaped by an external capacitor between CG+ and CG−. No external op-amps, DACs, or microcontrollers are needed-the MAX3861EGG delivers complete closed-loop control with only one passive component for time constant tuning.
Can the MAX3861EGG drive a 100Ω differential load directly?
No-the MAX3861EGG is designed for 50Ω single-ended (100Ω differential) CML interfaces but uses on-chip 50Ω termination referenced to VCC, not ground. Driving a true 100Ω differential load would require external AC-coupling and termination. The device expects 50Ω to VCC on both input and output; mismatched loads degrade return loss, increase jitter, and distort the output common-mode level.
What is the function of the OSM pin on the MAX3861EGG?
The OSM (Output Signal Monitor) pin on the MAX3861EGG provides a DC voltage linearly proportional to the instantaneous differential output amplitude-0.9V at 400mVP-P and 2.0V at 920mVP-P. Unlike RSSI (which tracks input), OSM enables real-time verification of AGC action and output stage health, supporting closed-loop calibration and fault detection in carrier-grade optical modules.
Is the MAX3861EGG pin-compatible with the MAX3861ETG?
Yes-the MAX3861EGG and MAX3861ETG share identical 24-pin QFN footprints and pinouts. The only difference is package thickness: MAX3861EGG uses a standard 0.8mm-thick QFN, while MAX3861ETG uses a thinner 0.65mm variant. Both have the same exposed pad, thermal pad dimensions, and mechanical outline per Maxim's package drawings (G2444-1 vs. T2444-3), enabling direct PCB substitution.
MAX3861EGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Postamplifier
- Applications:
- Optical Networks
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-TQFN (4x4)
MAX3861EGG FAQ
1.How can I place an order for MAX3861EGG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3861EGG 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 MAX3861EGG reliable?
The price and inventory of MAX3861EGG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3861EGG is usually 5 days.
3.What payment methods are accepted for MAX3861EGG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3861EGG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3861EGG?
MAX3861EGG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3861EGG 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 MAX3861EGG?
For technical support, including MAX3861EGG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3861EGG requirements.
6.How does Aetrix verify that MAX3861EGG is sourced from the original manufacturer or authorized distributors?
All MAX3861EGG 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 MAX3861EGG meets industry standards.
7.What is the process for return or replacement of MAX3861EGG?
All MAX3861EGG units undergo pre-shipment inspection (PSI). If there is an issue with MAX3861EGG, 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 MAX3861EGG part is unused and in its original packaging.
Return procedure for MAX3861EGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX3861EGG Tags
-
TSM103WIDT
STMicroelectronics
-
LM392M/NOPB
Texas Instruments
-
MCP6S93T-E/UN
Microchip Technology
-
INA137UA/2K5
Texas Instruments
-
INA134UA/2K5
Texas Instruments
-
TS34118CS28 RDG
Taiwan Semiconductor Corporation
-
SI8920BC-IPR
Skyworks Solutions Inc.
-
ADUM3190ARQZ-RL7
Analog Devices Inc.
-
ADUM3190ARQZ
Analog Devices Inc.
-
AMC1311BDWVR
Texas Instruments
-
AMC1350DWVR
Texas Instruments
-
ADUM3190SRQZ-RL7
Analog Devices Inc.
Tech Hub
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.
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…
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…
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…
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 …
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…
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…
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…
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…
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…
