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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Programmable Timers and Oscillators

Renesas 8N3DV85AC-0047CDI

Name: 8N3DV85AC-0047CDI
Brand: Renesas
SKU: 8N3DV85AC-0047CDI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 8N3DV85AC-0047CDI

Manufacturer:: Renesas

Category:: Programmable Timers and Oscillators

Package:: 6-CLCC

Datasheet:: 8N3DV85AC-0047CDI.pdf

Description:: IC OSC VCXO DUAL FREQ 6-CLCC

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Product details

Overview

8N3DV85AC-0047CDI from Renesas (formerly IDT) is a LVPECL dual-frequency programmable voltage-controlled crystal oscillator (VCXO) with factory-programmed frequencies in the 15.476–866.67 MHz and 975–1,300 MHz ranges, 0.46 ps RMS phase jitter at 622.08 MHz (12 kHz–20 MHz), ±20 ppm temperature stability (Option K), and operation from -40°C to +85°C. It serves as a precision timing source in wireless infrastructure baseband units.

For engineers reviewing the 8N3DV85AC-0047CDI datasheet, 8N3DV85AC-0047CDI pinout, 8N3DV85AC-0047CDI application, or 8N3DV85AC-0047CDI equivalent, this page delivers verified electrical specs, package dimensions, frequency selection logic, VCXO control voltage behavior, and real-world deployment context for telecom clocking systems requiring dual-rate reconfiguration without hardware change.

Technical Context

The 8N3DV85AC-0047CDI implements a fractional-N PLL using a 114.285 MHz fundamental-mode crystal reference, fourth-generation FemtoClock® NG VCO architecture, and configurable P/M/N dividers to synthesize two discrete output frequencies. Frequency selection is controlled by a single LVCMOS/LVTTL-compatible FSEL pin that switches between pre-programmed register sets.

Its VCXO function supports programmable pull range (±12.5 to ±787.5 ppm) and control voltage polarity, with oscillator gain (KV) of 7.57–477.27 ppm/V at 3.3 V and linearity (BSL variation) within ±0.4% across 10–90% VCC. The device uses internal pulldown resistors on FSEL and VC inputs and requires 50 Ω differential termination to VCC – 2 V for LVPECL outputs.

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 DC bias and signal integrity.
Frequency Range	Two factory-programmed frequencies: one in 15.476–866.67 MHz, another in 975–1,300 MHz; resolution ≤218 Hz.
RMS Phase Jitter	0.46 ps typical at 622.08 MHz (12 kHz–20 MHz integration); enables SONET/SDH OC-48 and 10G Ethernet PHY compliance.
Temp Stability	±20 ppm over -40°C to +85°C (Option K); meets stringent wireless infrastructure timing margin requirements.
Supply Voltage	2.5 V or 3.3 V ±5%; supports mixed-voltage system integration without level-shifting.
FSEL Logic	LVCMOS/LVTTL-compatible input with internal 50 kΩ pulldown; selects frequency 0 (FSEL = 0) or frequency 1 (FSEL = 1).
Startup Time	10 ms max after power-up; ensures deterministic initialization in synchronized base station subsystems.

Pinout & Package

6-lead ceramic VFQFN package, 5 mm × 7 mm × 1.55 mm, RoHS 6-compliant, with exposed thermal pad (not electrically connected). Pin 1 marked via index notch.

Pin/Terminal	Circuit Role	Design Meaning
1 - VC	VCXO control voltage input	Analog tuning port; accepts 0–VCC; sets output frequency deviation per programmed KV gain (ppm/V).
2 - FSEL	Frequency select input	LVCMOS/LVTTL logic input with internal 50 kΩ pulldown; selects between two factory-programmed frequencies.
3 - VEE	Negative supply	Ground reference for LVPECL outputs; must be connected to system GND (0 V).
4 - Q	Differential clock output (+)	LVPECL true output; 0.6–1.0 V peak-to-peak swing into 50 Ω load terminated to VCC – 2 V.
5 - nQ	Differential clock output (–)	LVPECL complement output; matched delay and amplitude to Q for low common-mode noise.
6 - VCC	Positive supply	2.5 V or 3.3 V ±5% main power rail; supplies core logic and output drivers.

Key Features

Feature	Design Value
Dual-frequency programmability	Two independent factory-set frequencies enable dynamic rate switching (e.g., 122.88 MHz ↔ 156.25 MHz) in CPRI/eCPRI fronthaul links.
Fractional-N synthesis	7-bit integer + 18-bit fractional feedback divider (MINT/MFRAC) achieves <218 Hz frequency step resolution for precise protocol alignment.
Low phase noise architecture	FemtoClock® NG VCO + high 114.285 MHz reference minimizes multiplication-induced jitter; -127 dBc/Hz @ 1 MHz offset at 622.08 MHz.
Configurable VCXO parameters	Pull range (±12.5 to ±787.5 ppm) and control voltage polarity are factory-programmed to match loop filter design in PLL applications.
Industrial temperature grade	-40°C to +85°C ambient operation validated per JEDEC standards; suitable for outdoor macrocell and remote radio head deployments.

Applications

Wireless Baseband Processing	Optical Transport Networking
Use Scenario: Synchronization of multi-carrier LTE/5G baseband processors (e.g., Xilinx RFSoC, Intel Agilex FPGA) requiring dual-clock domains for FFT and channel coding. IC Role / Device Role / Timing Role: Primary VCXO providing two stable, low-jitter reference clocks selectable via FPGA GPIO to adapt to variable symbol rates. Use Value: Eliminates need for two discrete oscillators or external multiplexer; reduces BOM count and PCB area while maintaining <1 ps jitter budget.	Use Scenario: Clocking 10G/25G OTU2/OTU3 framer ICs in DWDM line cards where frequency agility supports multiple client interface standards. IC Role / Device Role / Timing Role: Dual-rate timing source feeding SERDES PLLs; FSEL toggled during service provisioning to switch between 10.3125 Gbps and 25.78125 Gbps line rates. Use Value: Enables software-defined optical transport without hardware modification; maintains ±20 ppm stability across full industrial temperature range.
Telecom Synchronization Equipment	High-Speed Data Acquisition Systems
Use Scenario: Stratum 3E-compliant boundary clock in IEEE 1588v2 grandmaster devices needing holdover and fast frequency switching during PTP master failover. IC Role / Device Role / Timing Role: VCXO referenced by digital PLL for phase alignment; FSEL used to engage backup frequency during primary reference loss. Use Value: Achieves sub-microsecond frequency settling (<1 ms) and <0.5 ps RMS jitter-critical for sub-100 ns time error in packet networks.	Use Scenario: Sampling clock generation for 16-bit, 250 MSPS ADCs in radar and test equipment where dual sampling rates (e.g., 125 MHz / 250 MHz) improve dynamic range flexibility. IC Role / Device Role / Timing Role: Low-phase-noise clock source directly driving ADC sampling input; VC pin used for fine-tuning to compensate for board-level propagation delays. Use Value: Delivers 0.46 ps RMS jitter at 622.08 MHz-enabling >78 dB SNR in wideband digitization without external jitter cleaner.

Wireless Baseband Processing

Optical Transport Networking

Use Scenario: Synchronization of multi-carrier LTE/5G baseband processors (e.g., Xilinx RFSoC, Intel Agilex FPGA) requiring dual-clock domains for FFT and channel coding.

IC Role / Device Role / Timing Role: Primary VCXO providing two stable, low-jitter reference clocks selectable via FPGA GPIO to adapt to variable symbol rates.

Use Value: Eliminates need for two discrete oscillators or external multiplexer; reduces BOM count and PCB area while maintaining <1 ps jitter budget.

Use Scenario: Clocking 10G/25G OTU2/OTU3 framer ICs in DWDM line cards where frequency agility supports multiple client interface standards.

IC Role / Device Role / Timing Role: Dual-rate timing source feeding SERDES PLLs; FSEL toggled during service provisioning to switch between 10.3125 Gbps and 25.78125 Gbps line rates.

Use Value: Enables software-defined optical transport without hardware modification; maintains ±20 ppm stability across full industrial temperature range.

Telecom Synchronization Equipment

High-Speed Data Acquisition Systems

Use Scenario: Stratum 3E-compliant boundary clock in IEEE 1588v2 grandmaster devices needing holdover and fast frequency switching during PTP master failover.

IC Role / Device Role / Timing Role: VCXO referenced by digital PLL for phase alignment; FSEL used to engage backup frequency during primary reference loss.

Use Value: Achieves sub-microsecond frequency settling (<1 ms) and <0.5 ps RMS jitter-critical for sub-100 ns time error in packet networks.

Use Scenario: Sampling clock generation for 16-bit, 250 MSPS ADCs in radar and test equipment where dual sampling rates (e.g., 125 MHz / 250 MHz) improve dynamic range flexibility.

IC Role / Device Role / Timing Role: Low-phase-noise clock source directly driving ADC sampling input; VC pin used for fine-tuning to compensate for board-level propagation delays.

Use Value: Delivers 0.46 ps RMS jitter at 622.08 MHz-enabling >78 dB SNR in wideband digitization without external jitter cleaner.

Equivalent & Alternatives

The following parts are listed as comparable options for similar VCXO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si510-PROG	Single-output, I²C-programmable XO/VCXO; no dual-frequency mode; 0.5 ps phase jitter @ 125 MHz.	Lacks FSEL-based instantaneous frequency switching; requires firmware update for rate changes.	Choose when field-upgradable frequency configuration is prioritized over hardware-selectable dual rates.
AK21E-010000	LVPECL dual-frequency VCXO with same 5×7 mm ceramic package; ±25 ppm stability; 0.55 ps jitter @ 622 MHz.	Higher temp coefficient and jitter; not qualified for extended industrial (-40°C to +105°C) operation.	Consider only if ±20 ppm stability and sub-0.5 ps jitter are non-critical and cost sensitivity outweighs performance margin.

Compared with Si510-PROG and AK21E-010000, the 8N3DV85AC-0047CDI uniquely combines hardware-selectable dual frequencies, ±20 ppm industrial-grade stability, and 0.46 ps phase jitter-making it optimal for telecom infrastructure demanding deterministic, low-latency clock reconfiguration without software intervention or layout redesign.

Availability

8N3DV85AC-0047CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport networking, and telecom synchronization equipment requiring stable component supply, guaranteed long-term availability, and traceable RoHS-compliant sourcing.

Supply support for 8N3DV85AC-0047CDI 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 is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions, with deep heritage in high-performance clocking technology acquired through its acquisition of IDT.

The 8N3DV85AC-0047CDI belongs to Renesas' FemtoClock® NG VCXO product line, engineered specifically for next-generation wireless, optical, and synchronization systems demanding ultra-low jitter, dual-frequency agility, and industrial reliability.

FAQ

What is the factory-programmed frequency pair for 8N3DV85AC-0047CDI?

The exact frequency pair for 8N3DV85AC-0047CDI is defined by the order code suffix "0047" and is factory-programmed per Renesas' FemtoClock NG ordering documentation. Typical configurations include combinations such as 122.88 MHz / 156.25 MHz or 61.44 MHz / 122.88 MHz. To confirm the specific frequencies shipped with your 8N3DV85AC-0047CDI units, refer to the label on the tape-and-reel packaging or contact Aetrix Electronics with your lot number for traceable configuration data.

Can 8N3DV85AC-0047CDI operate with a 2.5 V supply instead of 3.3 V?

Yes, the 8N3DV85AC-0047CDI supports both 2.5 V ±5% and 3.3 V ±5% supply voltages. Electrical characteristics-including output voltage swing (0.4–1.0 V), phase jitter (0.46 ps typical), and FSEL input thresholds-are fully specified across both rails. When using 2.5 V, ensure the VC control voltage remains within 0–2.5 V and that LVPECL termination is adjusted to VCC – 2 V ≈ 0.5 V (typically implemented with 50 Ω to ground).

How does the FSEL pin behave during power-up of 8N3DV85AC-0047CDI?

At power-up, the internal 50 kΩ pulldown resistor on the FSEL pin ensures it defaults to logic low (0), selecting Frequency 0. This guarantees deterministic startup behavior without requiring external pull-down circuitry. The output settles to Frequency 0 within 10 ms (tSTARTUP), and switching to Frequency 1 occurs within 1 ms (tSET) after FSEL transitions high-enabling rapid, glitch-free reconfiguration in live systems.

What is the maximum allowable control voltage (VC) range for 8N3DV85AC-0047CDI?

The VC pin on the 8N3DV85AC-0047CDI accepts 0 V to VCC (either 2.5 V or 3.3 V), with nominal tuning point at VCC/2. Exceeding this range may cause undefined frequency behavior or damage. The device's oscillator gain (KV) is factory-programmed-e.g., 7.57–477.27 ppm/V at 3.3 V-and linearity is maintained within ±0.4% BSL variation across 10–90% VCC. Do not drive VC with signals exceeding VCC or below GND.

Is 8N3DV85AC-0047CDI pin-compatible with other IDT8N3DV85 variants?

Yes, all IDT8N3DV85 family members-including 8N3DV85AC-0047CDI-share identical 6-lead ceramic 5 mm × 7 mm × 1.55 mm CD package pinout and footprint. Mechanical compatibility is guaranteed across variants (e.g., different option codes or default frequencies). However, electrical behavior (e.g., stability grade, pull range, or jitter) varies by option code; always verify AC/DC specifications against your design requirements before substitution.

8N3DV85AC-0047CDI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: FemtoClock® NG

Package/Case:: 6-CLCC

Packaging:: Tray

Product Status:: Active

Type:: VCXO

Count:: -

Frequency:: 24.576MHz, 125MHz

Voltage - Supply:: 3.135V ~ 3.465V

Current - Supply:: 130 mA

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 6-CLCC (7x5)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

8N3DV85AC-0047CDI FAQ

1.How can I place an order for 8N3DV85AC-0047CDI through Aetrix?

Please submit a Request for Quotation (RFQ) for 8N3DV85AC-0047CDI 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 8N3DV85AC-0047CDI reliable?

The price and inventory of 8N3DV85AC-0047CDI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8N3DV85AC-0047CDI is usually 5 days.

3.What payment methods are accepted for 8N3DV85AC-0047CDI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8N3DV85AC-0047CDI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 8N3DV85AC-0047CDI?

8N3DV85AC-0047CDI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 8N3DV85AC-0047CDI 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 8N3DV85AC-0047CDI?

For technical support, including 8N3DV85AC-0047CDI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8N3DV85AC-0047CDI requirements.

6.How does Aetrix verify that 8N3DV85AC-0047CDI is sourced from the original manufacturer or authorized distributors?

All 8N3DV85AC-0047CDI 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 8N3DV85AC-0047CDI meets industry standards.

7.What is the process for return or replacement of 8N3DV85AC-0047CDI?

All 8N3DV85AC-0047CDI units undergo pre-shipment inspection (PSI). If there is an issue with 8N3DV85AC-0047CDI, 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 8N3DV85AC-0047CDI part is unused and in its original packaging.

Return procedure for 8N3DV85AC-0047CDI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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