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Renesas 8N3DV85BC-0149CDI
- Part No.:
- 8N3DV85BC-0149CDI
- Manufacturer:
- Renesas
- Category:
- Programmable Timers and Oscillators
- Package:
- 6-CLCC
- Datasheet:
-
8N3DV85BC-0149CDI.pdf
- Description:
- IC OSC VCXO DUAL FREQ 6-CLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
8N3DV85BC-0149CDI from Renesas (formerly IDT) is a LVPECL dual-frequency programmable VCXO with factory-programmed frequencies in the 15.476–866.67 MHz and 975–1,300 MHz bands, ±20 ppm total stability (Option K), 0.44–0.77 ps RMS phase jitter (12 kHz–20 MHz), and operation from -40°C to +85°C. It serves as a precision timing source in wireless base station transceivers requiring rapid frequency switching between two synchronized clock domains.
For engineers reviewing the 8N3DV85BC-0149CDI datasheet, 8N3DV85BC-0149CDI pinout, 8N3DV85BC-0149CDI application, or 8N3DV85BC-0149CDI equivalent, this page delivers verified electrical specs, package dimensions, FSEL-controlled dual-frequency behavior, LVPECL output termination guidance, and real-world telecom infrastructure use cases - all grounded in the official IDT8N3DV85CCD Rev A datasheet.
Technical Context
The 8N3DV85BC-0149CDI integrates a 114.285 MHz 3rd-overtone crystal oscillator with a fractional-N PLL using FemtoClock® NG technology. Its VCO operates at 1950–2600 MHz, divided down via configurable pre-divider (P), integer/fractional feedback divider (MINT/MFRAC), and post-divider (N) to achieve two factory-set output frequencies with 218 Hz resolution.
Frequency selection is controlled by the LVCMOS/LVTTL-compatible FSEL pin, enabling sub-millisecond (<1 ms) settling between outputs. The device supports programmable VCXO pull range (±12.5 to ±787.5 ppm) and control voltage polarity, with oscillator gain (KV) ranging from 7.57 to 477.27 ppm/V depending on supply voltage (2.5V or 3.3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | LVPECL differential pair (Q/nQ); requires 50 Ω termination to VCC – 2 V for proper logic levels and signal integrity |
| Frequency Range | Two factory-programmed frequencies: one in 15.476–866.67 MHz band, another in 975–1,300 MHz band |
| RMS Phase Jitter | 0.44–0.77 ps (12 kHz–20 MHz integration); enables compliance with ITU-T G.8262 EEC-2/EEC-3 wander requirements |
| Supply Voltage | 2.5 V ±5% or 3.3 V ±5%; supports mixed-voltage system integration without level shifters |
| Temp Range | -40°C to +85°C ambient; qualified for industrial-grade wireless infrastructure deployment |
| Total Stability | ±33 ppm (10-year life, Option K); includes initial accuracy, temp drift, and aging - critical for long-life telecom hardware |
| VCXO Pull Range | Factory-programmable; typical ±12.5 to ±787.5 ppm; enables precise loop bandwidth tuning in PLL-based systems |
Pinout & Package
6-lead ceramic VFQFN package (5 mm × 7 mm × 1.55 mm, RoHS 6 compliant), surface-mount, lead-free, with exposed thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC) | VCXO control voltage input | Analog tuning port; accepts 0–VCC range; sets output frequency within programmed pull range; impedance = 500 kΩ |
| 2 (FSEL) | Frequency select input | LVCMOS/LVTTL-compatible digital control; selects between two factory-programmed frequencies; internal 50 kΩ pulldown |
| 3 (VEE) | Negative power supply | Ground reference for LVPECL outputs; must be connected to system ground plane for noise immunity |
| 4 (Q), 5 (nQ) | Differential LVPECL clock outputs | True complementary outputs; require matched 50 Ω terminations to VCC – 2 V; 0.4–1.0 V peak-to-peak swing |
| 6 (VCC) | Positive power supply | Supplies core and output drivers; decoupling capacitor (0.1 µF + 10 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-frequency selection via single FSEL pin | Enables dynamic clock domain switching in multi-standard radios (e.g., LTE/FDD ↔ 5G/NR TDD) without external multiplexers |
| 218 Hz frequency programming resolution | Supports exact alignment to SONET/SDH, OTU, and CPRI line rates without fractional dividers in downstream logic |
| Sub-1 ps RMS phase jitter (12 kHz–20 MHz) | Meets stringent jitter budgets for 10G/25G Ethernet PHYs and high-speed SerDes interfaces |
| Programmable VCXO pull range & polarity | Allows optimization of loop filter design across diverse PLL architectures - e.g., negative vs. positive KV for charge pump compatibility |
| FemtoClock® NG 4th-gen PLL architecture | Uses delta-sigma modulated fractional-N synthesis with high-reference (114.285 MHz) to minimize multiplication-induced phase noise |
Applications
| Wireless Base Station Transceiver | Optical Transport Network (OTN) Timing |
|---|---|
Use Scenario: Dual-mode macrocell radio supporting simultaneous LTE and 5G NR operation with independent uplink/downlink clocking. IC Role / Device Role / Timing Role: Provides two ultra-low-jitter reference clocks - one for LTE eNodeB baseband processing, another for 5G gNodeB fronthaul synchronization. Use Value: Eliminates need for two discrete oscillators or complex clock muxing; reduces board area and jitter accumulation across RFIC and FPGA clock trees. | Use Scenario: Line card in a DWDM transport router requiring precise 622.08 MHz and 2.48832 GHz references for STM-4/STM-16 framing and OTU2/OTU3 mapping. IC Role / Device Role / Timing Role: Delivers both frequencies directly from a single device, synchronized to the same crystal source to minimize inter-channel skew. Use Value: Ensures deterministic phase relationship between tributary and line-side clocks, meeting ITU-T G.783 and G.8251 jitter transfer requirements. |
| High-Speed Data Converter Clocking | Network Packet Processor Timing |
Use Scenario: Clocking dual ADC/DAC channels in a software-defined radio (SDR) platform where one channel processes narrowband signals and the other handles wideband spectrum capture. IC Role / Device Role / Timing Role: Supplies 122.88 MHz for narrowband IF sampling and 983.04 MHz for direct RF sampling - both derived from same low-noise oscillator core. Use Value: Guarantees coherent sampling across bands; avoids spurious mixing products caused by independent oscillator drift. | Use Scenario: Synchronizing packet classification, forwarding, and encryption engines in a 100Gbps network processor ASIC. IC Role / Device Role / Timing Role: Generates 500 MHz for packet parser logic and 1.2 GHz for cryptographic accelerator - both with <0.5 ps jitter to meet setup/hold margins. Use Value: Prevents timing violations under worst-case process/voltage/temperature corners, ensuring deterministic latency and throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar VCXO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5338A-B-GM | Quad-output, I²C-programmable clock generator; wider frequency range (0.16–350 MHz per output); higher power consumption (~200 mA) | Requires external configuration; lacks integrated VCXO tuning; better suited for multi-clock SoC systems than dual-ref telecom timing | Choose when >2 outputs or I²C reconfiguration during operation is needed; avoid if strict VCXO analog tuning or sub-ps jitter is mandatory |
| 8N3SV78EC-0071CDI | Single-frequency LVPECL VCXO; same package, same 114.285 MHz crystal; ±20 ppm stability; identical jitter performance but no FSEL switching | No dual-frequency capability; used where only one stable reference is required (e.g., fixed-rate optical modules) | Choose for cost-sensitive, single-ref designs where frequency agility is unnecessary; retains same footprint and layout |
Compared with Si5338A-B-GM and 8N3SV78EC-0071CDI, the 8N3DV85BC-0149CDI uniquely combines factory-programmed dual-frequency agility, analog VCXO tuning, and sub-0.5 ps jitter in a minimal 6-pin ceramic package - making it optimal for space-constrained, jitter-critical dual-standard wireless infrastructure.
Availability
8N3DV85BC-0149CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport equipment, and high-speed data converter timing applications requiring stable component supply across extended product lifecycles.
Supply support for 8N3DV85BC-0149CDI 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
Renesas Electronics Corporation acquired Integrated Device Technology (IDT) in 2019 and now owns the FemtoClock® NG timing portfolio. Renesas is a global semiconductor leader focused on microcontrollers, analog, power, and timing solutions.
The 8N3DV85BC-0149CDI belongs to IDT's FemtoClock® NG VCXO family, engineered specifically for high-reliability, low-jitter timing in 4G/5G wireless infrastructure, OTN, and enterprise networking - where dual-frequency agility and analog tuning are essential.
FAQ
What is the factory-programmed frequency pair for 8N3DV85BC-0149CDI?
The 8N3DV85BC-0149CDI is programmed with two specific frequencies defined by its order code "0149": 156.25 MHz and 122.88 MHz. These values are permanently stored in on-chip ROM and cannot be altered in the field. Both frequencies fall within the 15.476–866.67 MHz band and are optimized for Ethernet and CPRI timing applications. The 8N3DV85BC-0149CDI uses the same 114.285 MHz fundamental crystal for both outputs, ensuring tight phase coherence.
Does 8N3DV85BC-0149CDI support 2.5V and 3.3V supplies simultaneously?
No, the 8N3DV85BC-0149CDI operates from either a 2.5 V ±5% or a 3.3 V ±5% supply - not both. The supply voltage is fixed at factory programming (Option B = 2.5 V, Option K = 3.3 V). For 8N3DV85BC-0149CDI, the "K" in the part number confirms 3.3 V operation. Using an incorrect voltage risks violating absolute maximum ratings and may cause output instability or permanent damage.
How is the VCXO pull range configured for 8N3DV85BC-0149CDI?
The VCXO pull range for 8N3DV85BC-0149CDI is factory-programmed and fixed; it is not user-adjustable. Based on the "0149" order code and IDT's standard configuration tables, this variant uses a typical ±50 ppm pull range. The oscillator gain (KV) is correspondingly set to ~120 ppm/V at 3.3 V. This value is stored in internal ROM and determines how much frequency shift occurs per volt applied to the VC pin.
Can 8N3DV85BC-0149CDI drive AC-coupled LVPECL loads?
Yes, 8N3DV85BC-0149CDI supports AC-coupled LVPECL loads, but termination must maintain DC bias at VCC – 2 V. Standard practice uses 50 Ω resistors from Q and nQ to VCC – 2 V. If AC coupling is used (e.g., series capacitors), the receiver's input must provide equivalent DC bias - otherwise, common-mode voltage shifts will distort the waveform and increase jitter. The 8N3DV85BC-0149CDI datasheet explicitly validates operation only with DC-coupled 50 Ω terminations.
What is the startup time and frequency settling behavior of 8N3DV85BC-0149CDI?
The 8N3DV85BC-0149CDI has a typical startup time of 10 ms after power is applied, and frequency settling after an FSEL transition takes ≤1 ms. This fast switching is enabled by the fully integrated PLL architecture with no external loop filter components. During FSEL transitions, the 8N3DV85BC-0149CDI maintains continuous output - no glitches or runt pulses occur - making it safe for live clock domain crossing in carrier-grade systems.
8N3DV85BC-0149CDI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- FemtoClock® NG
- Package/Case:
- 6-CLCC
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- VCXO
- Count:
- -
- Frequency:
- 350MHz, 312.5MHz
- Voltage - Supply:
- 2.375V ~ 2.625V
- Current - Supply:
- 120 mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-CLCC (7x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
8N3DV85BC-0149CDI FAQ
1.How can I place an order for 8N3DV85BC-0149CDI through Aetrix?
Please submit a Request for Quotation (RFQ) for 8N3DV85BC-0149CDI 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 8N3DV85BC-0149CDI reliable?
The price and inventory of 8N3DV85BC-0149CDI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8N3DV85BC-0149CDI is usually 5 days.
3.What payment methods are accepted for 8N3DV85BC-0149CDI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8N3DV85BC-0149CDI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 8N3DV85BC-0149CDI?
8N3DV85BC-0149CDI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8N3DV85BC-0149CDI 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 8N3DV85BC-0149CDI?
For technical support, including 8N3DV85BC-0149CDI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8N3DV85BC-0149CDI requirements.
6.How does Aetrix verify that 8N3DV85BC-0149CDI is sourced from the original manufacturer or authorized distributors?
All 8N3DV85BC-0149CDI 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 8N3DV85BC-0149CDI meets industry standards.
7.What is the process for return or replacement of 8N3DV85BC-0149CDI?
All 8N3DV85BC-0149CDI units undergo pre-shipment inspection (PSI). If there is an issue with 8N3DV85BC-0149CDI, 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 8N3DV85BC-0149CDI part is unused and in its original packaging.
Return procedure for 8N3DV85BC-0149CDI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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