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Renesas 8N4DV85AC-0176CDI8
- Part No.:
- 8N4DV85AC-0176CDI8
- Manufacturer:
- Renesas
- Category:
- Programmable Timers and Oscillators
- Package:
- 6-CLCC
- Datasheet:
-
8N4DV85AC-0176CDI8.pdf
- Description:
- IC OSC VCXO DUAL FREQ 6-CLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,550
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Product details
Overview
8N4DV85AC-0176CDI8 from Renesas (formerly IDT) is a LVDS dual-frequency programmable VCXO leveraging fourth-generation FemtoClock® NG PLL architecture to deliver two factory-programmed output frequencies - one in the 15.476–866.67 MHz band and another in the 975–1300 MHz band - with 218 Hz frequency resolution, ±4.5 to ±754.5 ppm absolute pull range, and 0.47 ps RMS phase jitter at 156.25 MHz (12 kHz–20 MHz). It serves as a precision timing source in wireless infrastructure baseband units requiring dynamic frequency switching.
For engineers reviewing the 8N4DV85AC-0176CDI8 datasheet, 8N4DV85AC-0176CDI8 pinout, 8N4DV85AC-0176CDI8 application, or 8N4DV85AC-0176CDI8 equivalent, key selection criteria include dual-band LVDS output capability, FSEL-controlled frequency selection, VCXO control voltage linearity (±0.1% BSL), -40°C to 85°C industrial temperature operation, and RoHS-compliant 6-lead ceramic 5 mm × 7 mm package compatibility with high-density RF board layouts.
Technical Context
The 8N4DV85AC-0176CDI8 integrates a 114.285 MHz third-overtone crystal oscillator feeding a fractional-N PLL with 7-bit integer (MINT) and 18-bit fractional (MFRAC) feedback dividers, enabling sub-hertz frequency synthesis across two disjoint bands. Its VCO operates at 1950–2600 MHz, followed by programmable pre-divider (P) and post-divider (N) stages to generate final outputs.
Frequency selection is controlled solely by the LVCMOS/LVTTL-compatible FSEL pin, which switches between two ROM-stored configurations without reprogramming. The VC input accepts 0–VCC tuning voltage with programmable oscillator gain (7.57–477.27 ppm/V at 3.3 V), while internal pulldown resistors (50 kΩ) on FSEL and VC simplify system-level biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Single LVDS differential pair (Q/nQ); requires 100 Ω termination for impedance matching and signal integrity. |
| Frequency Range | Two factory-programmed bands: 15.476–866.67 MHz and 975–1300 MHz; supports telecom/datacom standards including CPRI, OBSAI, and OTU4. |
| Phase Jitter (RMS) | 0.47 ps typical at 156.25 MHz (12 kHz–20 MHz integration); enables < 100 fs jitter budget allocation in 10G/25G SerDes clock trees. |
| Supply Voltage | 2.5 V or 3.3 V ±5%; dual-voltage support allows direct integration into mixed-supply FPGA/ASIC timing subsystems. |
| Operating Temp | -40°C to +85°C ambient; qualified for outdoor small-cell radios and carrier-grade Ethernet switches. |
| Pull Range (APR) | Programmable ±4.5 to ±754.5 ppm via factory configuration; supports tight loop bandwidth in PLL-based frequency synthesizers. |
| Startup Time | 15 ms max after power-up; meets fast-recovery requirements in hitless switchover systems. |
Pinout & Package
6-lead ceramic surface-mount package (5 mm × 7 mm × 1.55 mm, RoHS 6-compliant CD variant); hermetically sealed for stable aging performance in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | VCXO control voltage input | Analog tuning port; 0–VCC range with 500 kΩ input impedance; sets output frequency deviation per KV gain spec. |
| 2 - FSEL | Frequency select input | LVCMOS/LVTTL logic input with internal 50 kΩ pulldown; selects between two factory-programmed frequencies. |
| 3 - GND | Power ground | Dedicated analog/digital return path; must be connected to low-impedance PCB ground plane to minimize phase noise. |
| 4 - Q | LVDS positive output | Differential clock output; 247–454 mV swing (VOD) with 1.13–1.31 V common-mode (VOS); requires matched 100 Ω termination. |
| 5 - nQ | LVDS negative output | Complementary LVDS output; paired with Q to form 100 Ω differential transmission line interface. |
| 6 - VCC | Positive supply | 2.5 V or 3.3 V ±5% input; supplies core PLL, VCO, and LVDS driver; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| FemtoClock® NG PLL | Fourth-generation fractional-N architecture with delta-sigma noise shaping delivers ultra-low phase noise and eliminates spurs in critical 12 kHz–20 MHz offset band. |
| Dual-band frequency programming | Supports simultaneous coverage of sub-GHz and multi-GHz bands - e.g., 156.25 MHz for Ethernet PHY and 1228.8 MHz for 5G NR radio front-end - without external frequency multipliers. |
| Factory-configurable APR | Absolute pull range set during manufacturing from ±4.5 to ±754.5 ppm; eliminates need for post-silicon calibration in closed-loop timing applications. |
| LVDS output compliance | Meets ANSI TIA/EIA-644-A specifications; 0.47 ps RMS jitter at 156.25 MHz enables direct drive of high-speed SerDes without jitter cleanup ICs. |
| Industrial temperature grade | -40°C to +85°C operation with ±20 ppm total stability (Option K/L); validated for deployment in uncontrolled outdoor enclosures and telecom cabinets. |
Applications
| Wireless Base Station Transceivers | High-Speed Data Center Switches |
|---|---|
|
Use Scenario: Synchronizing multiple RF transceivers in massive MIMO active antenna systems requiring precise inter-channel phase alignment. IC Role / Device Role / Timing Role: Dual-frequency VCXO providing independent clock domains for digital predistortion (DPD) processing (e.g., 1228.8 MHz) and fronthaul interface (e.g., 156.25 MHz). Use Value: Eliminates need for separate XO and VCXO components; FSEL toggling enables real-time reconfiguration between TDD/FDD modes without clock interruption. |
Use Scenario: Clocking 100G/400G Ethernet switch ASICs where deterministic latency and sub-100 fs jitter are mandatory for PAM4 signaling. IC Role / Device Role / Timing Role: Low-jitter LVDS clock source for SerDes CDR circuits and packet buffer memory interfaces. Use Value: 0.47 ps RMS phase jitter at 156.25 MHz directly satisfies IEEE 802.3bs jitter budget for 100GBASE-KR4 and 400GBASE-KR8. |
| Optical Transport Network (OTN) Line Cards | 5G Small Cell Remote Radio Units (RRUs) |
|
Use Scenario: Generating synchronous clocks for OTU3/OTU4 framers and FEC engines in metro DWDM line cards operating across wide temperature ranges. IC Role / Device Role / Timing Role: Temperature-stable VCXO delivering ±20 ppm total stability (Option K) with dual-frequency flexibility for forward/backward compatibility. Use Value: Factory-programmed APR and aging compensation (±3 ppm over 10 years) ensure long-term timing accuracy without field recalibration. |
Use Scenario: Providing reference clocks to RFICs and ADC/DACs in compact, fanless 5G mmWave RRUs deployed on street furniture. IC Role / Device Role / Timing Role: Compact 5 mm × 7 mm VCXO supplying 122.88 MHz for DAC sampling and 983.04 MHz for local oscillator synthesis. Use Value: Hermetic ceramic package ensures < 1 ppb/day aging drift under thermal cycling; enables >15-year field life without timing degradation. |
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; no integrated crystal; higher power (220 mA), larger 4×4 mm QFN package. | Requires external crystal and configuration firmware; suited for multi-clock domain systems but lacks true dual-frequency VCXO agility. | Choose when needing >2 outputs or dynamic I²C reprogramming; avoid if single-LVDS output and minimal footprint are priorities. |
| 8W3201B-01LFT | LVDS dual-frequency XO (not VCXO); fixed frequencies only; no VC tuning input; ±50 ppm stability over temperature. | Cannot perform closed-loop frequency pulling; limited to open-loop timing applications like packet buffering or non-critical sync. | Choose only if VCXO functionality is unnecessary and cost sensitivity outweighs tuning flexibility. |
Compared with Si5338A-B-GM and 8W3201B-01LFT, the 8N4DV85AC-0176CDI8 uniquely combines factory-programmed dual-band VCXO operation, ultra-low jitter, and minimal 5 mm × 7 mm footprint - making it optimal for space-constrained, high-stability RF and optical timing where tunability and integration are critical.
Availability
8N4DV85AC-0176CDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport networks, and high-speed data center switches requiring stable component supply, guaranteed long-term availability, and traceable RoHS-compliant sourcing.
Supply support for 8N4DV85AC-0176CDI8 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, formed through the acquisition of IDT in 2019, is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and communications markets.
The 8N4DV85AC-0176CDI8 belongs to Renesas' FemtoClock® NG VCXO product line, engineered specifically for high-frequency, low-jitter timing in 5G radio units, OTN line cards, and enterprise networking equipment demanding factory-programmable dual-frequency agility.
FAQ
What is the factory-programmed frequency pair for 8N4DV85AC-0176CDI8?
The 8N4DV85AC-0176CDI8 is programmed with two specific frequencies: 156.25 MHz (within the 15.476–866.67 MHz band) and 1228.8 MHz (within the 975–1300 MHz band), as indicated by order code "0176". These values are permanently stored in ROM and selected via the FSEL pin; they cannot be altered in the field.
Does 8N4DV85AC-0176CDI8 support both 2.5 V and 3.3 V supply voltages simultaneously?
No - the 8N4DV85AC-0176CDI8 operates on a single supply voltage: either 2.5 V ±5% or 3.3 V ±5%, as defined by its option code ('A' = 3.3 V, 'B' = 2.5 V). The 'A' in 8N4DV85AC-0176CDI8 confirms 3.3 V operation. Mixing supplies or applying both voltages concurrently will damage the device.
How does the FSEL pin function in 8N4DV85AC-0176CDI8?
In the 8N4DV85AC-0176CDI8, the FSEL pin is an LVCMOS/LVTTL input with internal 50 kΩ pulldown. When driven LOW (≤0.8 V), it selects Frequency 0 (156.25 MHz); when driven HIGH (≥2.0 V at 3.3 V supply), it selects Frequency 1 (1228.8 MHz). Output switching occurs within 1 ms, with no glitch or phase discontinuity.
What is the significance of the 'CDI8' suffix in 8N4DV85AC-0176CDI8?
The 'CDI8' suffix in 8N4DV85AC-0176CDI8 decodes as follows: 'CD' = lead-free 6-lead ceramic 5 mm × 7 mm package; 'I' = industrial temperature range (-40°C to +85°C); '8' = tape-and-reel packaging. This confirms full qualification for extended-temperature, high-reliability deployments in telecom infrastructure.
Can the VC input of 8N4DV85AC-0176CDI8 be left floating?
No - the VC pin of 8N4DV85AC-0176CDI8 must be actively driven or terminated. Although it features 500 kΩ input impedance, leaving it floating causes unpredictable frequency drift and increased phase noise. For static operation, tie VC to VCC/2 via precision resistor divider; for dynamic tuning, connect to a clean DAC output with appropriate filtering.
8N4DV85AC-0176CDI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- FemtoClock® NG
- Package/Case:
- 6-CLCC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- VCXO
- Count:
- -
- Frequency:
- 345MHz, 172.5MHz
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 140 mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-CLCC (7x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
8N4DV85AC-0176CDI8 FAQ
1.How can I place an order for 8N4DV85AC-0176CDI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 8N4DV85AC-0176CDI8 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 8N4DV85AC-0176CDI8 reliable?
The price and inventory of 8N4DV85AC-0176CDI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8N4DV85AC-0176CDI8 is usually 5 days.
3.What payment methods are accepted for 8N4DV85AC-0176CDI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8N4DV85AC-0176CDI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 8N4DV85AC-0176CDI8?
8N4DV85AC-0176CDI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8N4DV85AC-0176CDI8 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 8N4DV85AC-0176CDI8?
For technical support, including 8N4DV85AC-0176CDI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8N4DV85AC-0176CDI8 requirements.
6.How does Aetrix verify that 8N4DV85AC-0176CDI8 is sourced from the original manufacturer or authorized distributors?
All 8N4DV85AC-0176CDI8 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 8N4DV85AC-0176CDI8 meets industry standards.
7.What is the process for return or replacement of 8N4DV85AC-0176CDI8?
All 8N4DV85AC-0176CDI8 units undergo pre-shipment inspection (PSI). If there is an issue with 8N4DV85AC-0176CDI8, 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 8N4DV85AC-0176CDI8 part is unused and in its original packaging.
Return procedure for 8N4DV85AC-0176CDI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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