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Renesas GX36420-DNT
- Part No.:
- GX36420-DNT
- Manufacturer:
- Renesas
- Category:
- Telecom
- Package:
- Die
- Datasheet:
-
GX36420-DNT.pdf
- Description:
- DIE SALE (PRICE IN GOOD DIE)-WAF
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Product details
Overview
GX36420-DNT from Integrated Device Technology (IDT) is a quad-channel 64Gbps linear transimpedance amplifier (TIA) IC designed for coherent optical receiver front-ends in 400G/600G systems. It integrates four independent TIAs for XI/XQ/YI/YQ channels, supports 16QAM/64QAM modulation, delivers >40GHz 3dB bandwidth, 150–5000Ω differential gain, and >30dB dynamic range, and is optimized for CFP2/CFP4 optical modules.
For engineers reviewing the GX36420-DNT datasheet, GX36420-DNT pinout, GX36420-DNT application, or GX36420-DNT equivalent, key selection criteria include per-channel TIA bandwidth, gain adjustability, integrated SPI/analog control interface, RSSI/peak detection capability, and compatibility with small-form-factor coherent optical modules.
Technical Context
The GX36420-DNT implements four fully independent linear TIA channels with dedicated VGA1/VGA2 output stages, DC offset cancellation loops per channel, and configurable peaking control. Each channel features programmable gain control (MGC/AGC), input current monitoring, and loss-of-signal (LOS) detection.
It integrates on-die ADC/DAC, SPI interface (CS/SCK/MOSI/MISO/RST), and analog biasing circuitry for photodiode arrays. The core architecture supports simultaneous DC calibration and real-time signal integrity monitoring including RSSI, peak detection, and output voltage control across all four lanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 4 independent TIAs for XI, XQ, YI, YQ coherent detection paths |
| Small-Signal Bandwidth | >40GHz 3dB - enables full 64Gbps PAM4/16QAM/64QAM signal recovery |
| Differential Transimpedance Gain | 150–5000Ω - supports wide dynamic range of photodiode currents without saturation |
| Dynamic Range | >30dB - accommodates varying optical power levels in long-haul and metro coherent links |
| Interface Type | SPI + analog control - allows digital configuration and analog fine-tuning of gain, bandwidth, and output voltage |
| Integrated Monitoring | RSSI, peak detection, input current monitor, LOS - enables closed-loop receiver optimization and fault diagnostics |
| Power Supply | VCCin1–VCCin4, VCCout1–VCCout4 - separate supply domains per channel for noise isolation and thermal management |
Pinout & Package
Package: 120-pin flip-chip BGA (9.0 mm × 9.0 mm, 0.65 mm pitch), RoHS-compliant, designed for high-density optical module integration in CFP2/CFP4 form factors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| In1p–In4n | Differential photodiode inputs (4 channels) | Accepts low-current photocurrent signals from balanced PD pairs; matched routing critical for common-mode rejection |
| Out1p–Out4n | Differential amplified outputs | Drives subsequent limiting amplifiers or ADCs; 50Ω termination required at receiver end |
| CS, SCK, MOSI, MISO, RST | SPI serial interface | Enables register-based configuration of gain, bandwidth, shutdown, and monitoring functions |
| VCCin1–VCCin4 | Analog input-stage supplies | Isolated power domains per TIA channel to minimize inter-channel crosstalk and thermal coupling |
| VCCout1–VCCout4 | Analog output-stage supplies | Independent regulation ensures clean output swing and minimizes supply-induced distortion |
| REF, PKD_SUM, GC_SUM, LOS | Reference, summed peak/gain/loss signals | Supports system-level calibration and status aggregation without per-channel readback overhead |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel linear TIA architecture | Enables full polarization-multiplexed coherent detection (XI/XQ/YI/YQ) on single die, reducing PCB area and interconnect loss vs. discrete solutions |
| Adjustable bandwidth per channel | Allows optimization for specific modulation format (e.g., narrower BW for 16QAM, wider for 64QAM) while maintaining SNR |
| Integrated RSSI and peak detection | Provides real-time signal quality metrics for adaptive equalization and laser power control without external components |
| Per-channel DC offset cancellation | Compensates for photodiode dark current drift and process variation, ensuring baseline stability over temperature and lifetime |
| Low THD and inter-channel crosstalk | Preserves EVM in 64QAM systems (<−45 dBc THD typical) and prevents I/Q crosstalk-induced constellation rotation |
Applications
| 400G/600G Coherent Optical Transceivers | CFP2/CFP4 Integrated Optical Modules |
|---|---|
Use Scenario: High-speed data center interconnect (DCI) and metro transport links requiring 400G/600G line rates with 16QAM/64QAM modulation. IC Role / Device Role / Timing Role: Front-end TIA for polarization-diverse coherent receiver, converting photodiode current to voltage with minimal added noise and distortion. Use Value: Delivers >40GHz bandwidth and >30dB dynamic range to maintain EVM <4% under real-world optical SNR conditions. | Use Scenario: Space-constrained pluggable optics where thermal density and interconnect parasitics must be minimized. IC Role / Device Role / Timing Role: Monolithic quad-TIA enabling compact CFP2/CFP4 module design with reduced component count and shorter RF traces. Use Value: Eliminates four discrete TIA packages and associated layout complexity, improving yield and thermal uniformity across channels. |
| Coherent DSP-Based Receiver Systems | High-Performance Test & Measurement Equipment |
Use Scenario: Lab-grade coherent receivers used for optical component characterization and modulation format validation. IC Role / Device Role / Timing Role: Programmable TIA front-end supporting rapid reconfiguration between 16QAM, 64QAM, and PAM4 modes via SPI. Use Value: Enables single-hardware platform testing across multiple modulation schemes without hardware change. | Use Scenario: Bit-error-rate testers (BERTs) and optical sampling oscilloscopes requiring ultra-low-noise, high-bandwidth analog capture. IC Role / Device Role / Timing Role: Low-THD, low-crosstalk TIA stage preserving signal fidelity for accurate waveform reconstruction. Use Value: Maintains <−45 dBc THD and <−55 dB inter-channel isolation, critical for sub-1% EVM measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel high-speed TIA applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3748AETE+T | Single-channel 28Gbps TIA; no integrated SPI, lower bandwidth (~25GHz), no RSSI/peak detection | Targeted at 100G NRZ/PAM4 short-reach links, not coherent 400G/600G | Select only for cost-sensitive, lower-speed non-coherent applications where quad integration is unnecessary |
| LMH6401IRGT | Single-channel 10.5GHz gain block with 30dB fixed gain; no TIA function, no photodiode biasing, no digital interface | Used in RF/IF signal chains, not optical front-ends; requires external TIA and bias circuitry | Applicable only when building custom TIA+VGA stages with discrete photodiode biasing and control |
Compared with MAX3748AETE+T and LMH6401IRGT, the GX36420-DNT uniquely delivers quad 64Gbps linear TIA functionality with integrated photodiode biasing, SPI-configurable gain/bandwidth, and per-channel monitoring-enabling direct use in space-constrained 400G/600G coherent modules without supplemental ICs.
Availability
GX36420-DNT is available at Aetrix Electronics and suitable for 400G/600G coherent transceivers, CFP2/CFP4 optical modules, and high-performance test equipment requiring stable component supply and long-term lifecycle support.
Supply support for GX36420-DNT 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
Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-speed signal conditioning ICs for communications and data center infrastructure.
The GX36420-DNT belongs to IDT's coherent optical receiver portfolio, engineered specifically to replace multi-chip TIA solutions in next-generation 400G/600G pluggable modules with single-die integration, reduced power, and enhanced signal integrity.
FAQ
What modulation formats does the GX36420-DNT support?
The GX36420-DNT supports 16QAM and 64QAM modulation formats in 400G/600G coherent systems. Its >40GHz 3dB bandwidth and >30dB dynamic range enable accurate signal recovery for both formats. The GX36420-DNT achieves this through linear transimpedance gain (150–5000Ω) and low THD (<−45 dBc), preserving constellation fidelity without requiring external equalization.
Does the GX36420-DNT include photodiode biasing circuitry?
Yes, the GX36420-DNT integrates photodiode bias (PD bias) circuitry per channel, as confirmed in the block diagram and functional description. This eliminates the need for external bias controllers and simplifies layout in CFP2/CFP4 modules. The GX36420-DNT provides dedicated PDS1–PDS4 pins and internal filtering to stabilize reverse-bias voltage across all four photodiode inputs.
How is gain controlled on the GX36420-DNT?
The GX36420-DNT supports both automatic gain control (AGC) and manual gain control (MGC) via its integrated SPI interface. Gain is adjusted across 150–5000Ω using on-die DACs and analog control loops. The GX36420-DNT also provides real-time gain monitoring (GC_SUM) and per-channel gain control signals (GC_OA1–GC_OA4) for closed-loop system tuning.
What package type is used for the GX36420-DNT?
The GX36420-DNT uses a 120-pin flip-chip BGA package measuring 9.0 mm × 9.0 mm with 0.65 mm pitch. This package is optimized for thermal dissipation and high-frequency signal integrity in dense optical modules. The GX36420-DNT's pinout includes dedicated VCCin/VCCout rails per channel to suppress inter-channel coupling, as specified in the official short-form datasheet.
Can the GX36420-DNT be used in non-coherent applications?
The GX36420-DNT is specifically architected for coherent optical receivers, with features like XI/XQ/YI/YQ channel pairing, integrated RSSI, and polarization-diverse signal processing. While it can amplify differential current signals in principle, its bandwidth, gain range, and monitoring functions are calibrated for 64Gbps coherent waveforms. For non-coherent use, the GX36420-DNT would require extensive external compensation and lacks native support for NRZ/PAM4 clock recovery.
GX36420-DNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- -
- Interface:
- SPI
- Number of Circuits:
- 4
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
GX36420-DNT FAQ
1.How can I place an order for GX36420-DNT through Aetrix?
Please submit a Request for Quotation (RFQ) for GX36420-DNT 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 GX36420-DNT reliable?
The price and inventory of GX36420-DNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GX36420-DNT is usually 5 days.
3.What payment methods are accepted for GX36420-DNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GX36420-DNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GX36420-DNT?
GX36420-DNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GX36420-DNT 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 GX36420-DNT?
For technical support, including GX36420-DNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GX36420-DNT requirements.
6.How does Aetrix verify that GX36420-DNT is sourced from the original manufacturer or authorized distributors?
All GX36420-DNT 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 GX36420-DNT meets industry standards.
7.What is the process for return or replacement of GX36420-DNT?
All GX36420-DNT units undergo pre-shipment inspection (PSI). If there is an issue with GX36420-DNT, 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 GX36420-DNT part is unused and in its original packaging.
Return procedure for GX36420-DNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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