GX36420-F-DNT - 64Gbps Linear Quad TIA | Renesas Electronics
MPN： GX36420-F-DNT ✓ 啟用中GX36420-F-DNT 概覽
A transimpedance amplifier (TIA) is a current-to-voltage converter that sits at the front end of an optical receiver, converting the photocurrent generated by a photodiode into a proportional voltage signal. Within the signal-chain hierarchy, a TIA is a high-speed analog amplifier, a subclass of operational-amplifier-based receiver front ends, which in turn belong to the broader power and signal management IC family. In coherent optical transceivers, four TIAs process the XI, XQ, YI, and YQ polarization/multiplexed channels of a coherent receiver.
Key features of the GX36420 family include four integrated linear TIA lanes per die at 64Gbps per lane, on-chip digital interface circuitry for DC controls, and single-die integration optimized for 400G/600G coherent receiver modules. Linear (unlimited amplitude) TIA output preserves the analog waveform, enabling downstream DSP-based clock and data recovery and digital signal processing required by coherent modulation formats such as DP-QPSK and DP-16QAM.
The architecture combines the four TIAs with the digital control interface on one die, reducing channel-to-channel skew and simplifying integration inside coherent receiver photonic assemblies. Linear gain characteristics allow the DSP to perform equalization and phase recovery, a requirement that limiting (saturating) TIAs cannot satisfy.
Typical applications include 400G and 600G coherent optical transceivers, data-center interconnect (DCI) and long-haul/telecom coherent line cards, and coherent receiver ROADM subsystems.
Design consideration: linear TIAs are sensitive to photodiode parasitic capacitance and supply noise; follow the manufacturer evaluation-board layout guidance for the photodiode-to-TIA bond/interface path.
This page synthesizes distributor pricing, availability, and family-level technical context not found on a single datasheet page; several detailed electrical specifications require datasheet verification.
直接替換替代品，適用於 GX36420-F-DNT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： GX36420-F-DNT （相同外形與佔位） — 差異在於 Number of Channels, Device Type, MSL Level, Target Application.
GX36420-DNT
✅ 直接替換聯絡詢價
查看資料表 →GX36420-F-DNT 最大額定值與電氣特性
| Product Type | Linear Transimpedance Amplifier (TIA) |
| Data Rate per Lane | 64 Gbps |
| Number of Channels | 4 (XI, XQ, YI, YQ) |
| Target Application | 400G/600G coherent optical receivers |
| 輸出類型 | Linear (unlimited amplitude) |
| Integrated Digital Interface | Yes, on-die DC control interface |
| Integration | 4 TIA lanes + digital control on single die |
| Manufacturer | Renesas Electronics (formerly IDT) |
GX36420-F-DNT standard 腳位配置指南
GX36420-F-DNT（standard 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： GX36420-F-DNT.
請參閱 資料表 以查看完整腳位配置。
典型應用
GX36420-F-DNT 適用於 6 應用s: 400G Coherent Optical Transceivers, 600G Coherent Line Cards, Data-Center Interconnect (DCI), Coherent Receiver ROADM Subsystems, Optical Test and Measurement Equipment, Hybrid Photonic Integrated Circuit Modules.
400G Coherent Optical Transceivers
The GX36420-F-DNT fits 400G coherent transceivers directly because its four 64Gbps linear TIA lanes map one-to-one onto the XI, XQ, YI, and YQ photodiode quadrature outputs of a coherent receiver, while its linear (unlimited-amplitude) transfer function preserves the amplitude and phase information the downstream DSP needs for equalization and carrier-phase recovery. In a typical module the four photodiode currents feed the TIA inputs, and the linear differential outputs drive the coherent DSP ASIC. The on-die digital DC-control interface allows the module MCU to trim operating points without external control ICs, reducing component count inside the compact CFP2-DCO/OSFP form factor.
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600G Coherent Line Cards
For 600G coherent line cards in long-haul and metro telecom, the GX36420-F-DNT provides the required four-lane 64Gbps linear receiver front end in a single die, keeping channel-to-channel skew low and simplifying the interface between the photonic integrated circuit and the coherent DSP. The linear output preserves constellation integrity for high-order modulation such as DP-16QAM, where limiting TIAs would destroy phase information. Because the four TIAs plus digital DC-control circuitry are integrated on one die, designers gain consistent gain and offset behavior across lanes, which improves DSP convergence time and reduces per-lane calibration effort during manufacturing.
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Data-Center Interconnect (DCI)
Data-center interconnect platforms use 400G/600G coherent links over campus-to-metro distances, and the GX36420-F-DNT serves as the receiver front end that converts coherent photodiode current into linear voltage for DSP-based demodulation. Its 64Gbps per-lane rate matches the symbol rate of 400G DP-QPSK-class DCI links, and the single-die four-channel integration suits the compact, power-constrained QSFP-DD/OSFP coherent modules used in DCI appliances. The digital DC-control interface lets module firmware adapt the TIA operating point across temperature and fiber-span variations, maintaining receiver sensitivity over heterogeneous metro fiber plants with variable attenuation and OSNR.
推薦
Coherent Receiver ROADM Subsystems
In ROADM-based coherent receiver subsystems, the GX36420-F-DNT processes the four quadrature photocurrents from the polarization-diversity coherent mixer, delivering linear 64Gbps outputs for DSP clock and data recovery. Its linear transfer characteristic is essential here because the DSP must reconstruct the optical field to track polarization rotation and chromatic dispersion introduced by reconfigurable optical add-drop nodes. The integrated on-die digital interface for DC controls allows the subsystem controller to compensate gain drift as channels are added, dropped, or re-routed, keeping the receiver operating point stable across dynamic wavelength configurations without additional analog control circuitry on the line card.
推薦
Optical Test and Measurement Equipment
Coherent optical test equipment, including bit-error-ratio testers and coherent-lightwave analyzers, requires a faithful linear analog front end to characterize 400G/600G waveforms, and the GX36420-F-DNT provides four 64Gbps linear TIA channels in one die for this role. Because the instrument must measure amplitude, phase, and noise rather than just detect ones and zeros, the unlimited-amplitude linearity of this TIA is a defining requirement that limiting receiver front ends cannot satisfy. The digital DC-control interface enables automated test sequences to trim gain and offset under software control, supporting calibration routines and reducing the analog tuning burden on the instrument designer.
推薦
Hybrid Photonic Integrated Circuit Modules
The GX36420 family was architected for integration alongside photonic integrated circuits in 400G/600G coherent modules, and the GX36420-F-DNT packaged variant lets module developers prototype the full signal chain before committing to the bare-die GX36420-DNT in volume production. During prototyping, the packaged part mounts on an evaluation substrate next to the coherent mixer and DSP; in production, the die version is attached directly into the photonic package to shorten XI, XQ, YI, YQ interconnects and minimize parasitic capacitance. This prototype-to-production path, using electrically identical silicon, de-risks the transition and preserves validated gain, noise, and bandwidth performance.
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工程參考資料，適用於 GX36420-F-DNT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | GX36420-DNT |
|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics |
| Data Rate per Lane | 64 Gbps | 64 Gbps |
| Channel Count | 4 (XI, XQ, YI, YQ) | 4 (XI, XQ, YI, YQ) |
| Output Type | Linear (unlimited amplitude) | Linear (unlimited amplitude) |
| Digital DC Control Interface | Yes, on-die | Yes, on-die |
| Target Application | 400G/600G coherent | 400G/600G coherent |
| Supply Form | Packaged component | Bare die (die-attach assembly) |
主要差異化特點
- Single-die four-channel integration (對比GX36420-DNT (bare die))
- Linear (unlimited amplitude) output (對比Limiting TIAs in competing catalog front ends)
- Integrated digital DC-control interface (對比Discrete TIA plus external control IC approaches)
設計說明
As a 64Gbps-per-lane linear TIA, the GX36420-F-DNT is highly sensitive to input parasitics. Minimize the photodiode-to-TIA input path length, control bond-wire or trace inductance, and keep input node capacitance within the value assumed in the datasheet gain-bandwidth budget; excess capacitance directly erodes bandwidth headroom and peaking at the 64Gbps symbol rate. Use the manufacturer evaluation-board layout as the reference for the photonic interface, including ground return paths for the differential outputs feeding the coherent DSP.
Linear TIAs require low-noise supplies because supply noise appears at the output and degrades receiver OSNR performance. Provide dedicated low-dropout or filtered supply domains for the analog TIA rails, and isolate the on-die digital DC-control interface supply with local decoupling so digital switching transients do not couple into the four analog channels. Exact supply voltage and current values must be taken from the manufacturer datasheet, as verified web listings do not publish these figures.
Do not treat the GX36420 as a limiting TIA: its linear output preserves amplitude and phase information required by the downstream coherent DSP, so clipping the output (e.g., via overdriven buffering) destroys constellation data and fails DP-QPSK/16QAM demodulation. Also confirm form factor early: the GX36420-DNT variant is bare die (per DigiKey), so ordering the wrong supply form can stall photonic assembly. No verified drop-in second source exists, so plan single-source risk mitigation at design time.
合規資訊
Compliance status not stated in the provided web data; consult the Renesas product page or datasheet for RoHS/REACH declarations.
