Renesas 8N3DV85AC-0076CDI

Overview

8N3DV85AC-0076CDI from Renesas (formerly IDT) is a LVPECL dual-frequency programmable voltage-controlled crystal oscillator (VCXO) with factory-programmed frequencies in two bands: 15.476–866.67 MHz and 975–1,300 MHz, ±20 ppm stability (Option K), 0.44–1.2 ps RMS phase jitter, and operation from -40°C to +85°C. It serves as a precision timing source in wireless infrastructure baseband units requiring rapid frequency switching between two synchronized clock domains.

For engineers reviewing the 8N3DV85AC-0076CDI datasheet, 8N3DV85AC-0076CDI pinout, 8N3DV85AC-0076CDI application, or 8N3DV85AC-0076CDI equivalent, this page delivers verified electrical specs, FSEL-controlled dual-frequency behavior, LVPECL termination guidance, VCXO pull-range programmability, and industrial-grade thermal performance data - all confirmed from the official Rev. A datasheet.

Technical Context

The 8N3DV85AC-0076CDI integrates a 114.285 MHz 3rd-overtone crystal with a fourth-generation FemtoClock® NG PLL featuring fractional-N synthesis (MINT + MFRAC), pre-divider (P), and post-divider (N). Its architecture enables high-resolution frequency generation down to 218 Hz step size and supports immediate frequency switching via the LVCMOS/LVTTL-compatible FSEL pin.

It implements a VCO operating at 1950–2600 MHz, with configurable oscillator gain (KV = 7.57–477.27 ppm/V depending on supply), linearity-controlled VC input (BSL variation ±0.4%), and modulation bandwidth of 100 kHz. The device uses internal ROM to store two complete configuration sets - including frequency, pull range, and control voltage polarity - selected dynamically without reprogramming.

Key Specifications

Pinout & Package

6-lead ceramic VFQFN package (5 mm × 7 mm × 1.55 mm, RoHS 6-compliant, CD suffix), surface-mount, lead-free, with exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si514-A-D-GM and AK210-01-100.0000T, the 8N3DV85AC-0076CDI uniquely combines factory-programmed dual-frequency agility, analog VC tuning, ±20 ppm industrial stability, and sub-0.5 ps jitter - making it irreplaceable in carrier-grade wireless and optical transport timing architectures where both precision and flexibility are mandatory.

Availability

8N3DV85AC-0076CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport network equipment, and high-speed data center switch designs requiring stable component supply, guaranteed long-term manufacturability, and traceable RoHS-compliant sourcing.

Supply support for 8N3DV85AC-0076CDI 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 8N3DV85AC-0076CDI belongs to Renesas' FemtoClock® NG programmable timing portfolio, engineered specifically for high-frequency, low-jitter, dual-mode clock generation in next-generation wireless infrastructure and optical networking systems.

FAQ

What is the factory-programmed frequency pair for 8N3DV85AC-0076CDI?

The exact dual-frequency pair for 8N3DV85AC-0076CDI is set at manufacturing and encoded in the "0076" order code per IDT's FemtoClock NG ordering guide. While the device supports any combination within 15.476–866.67 MHz and 975–1,300 MHz, the specific values (e.g., 622.08 MHz / 1244.16 MHz) are defined per customer order and documented in the shipment certificate - not publicly listed in the generic datasheet. The 8N3DV85AC-0076CDI itself retains those values permanently in ROM.

Can the 8N3DV85AC-0076CDI be reprogrammed after soldering to the PCB?

No, the 8N3DV85AC-0076CDI is factory-programmed with immutable configuration stored in ROM - including both frequencies, VCXO pull range, and control voltage polarity. It lacks I2C, SPI, or other in-system programming interfaces. Reprogramming is not supported; frequency or tuning changes require replacement with a newly ordered variant. The 8N3DV85AC-0076CDI operates exclusively in its pre-configured state.

What is the recommended termination for 8N3DV85AC-0076CDI's LVPECL outputs at 3.3 V supply?

For 3.3 V operation, the 8N3DV85AC-0076CDI LVPECL outputs (Q/nQ) must be terminated to VCC – 2 V = 1.3 V using either a Thevenin-equivalent network (e.g., 84 Ω to VCC and 84 Ω to GND, with 125 Ω series resistors) or AC-coupled 50 Ω to 1.3 V. Improper termination causes duty cycle distortion, increased jitter, and degraded signal integrity - critical for 10G+ SerDes interfaces relying on the 8N3DV85AC-0076CDI.

Does 8N3DV85AC-0076CDI support spread-spectrum clocking (SSC)?

No, the 8N3DV85AC-0076CDI does not implement spread-spectrum clocking. Its PLL is optimized for ultra-low phase noise and deterministic frequency synthesis, not intentional frequency modulation. SSC is incompatible with the device's architecture and would violate its jitter specifications. Systems requiring EMI reduction must use external modulation or select a dedicated SSC-capable oscillator - the 8N3DV85AC-0076CDI delivers fixed, high-stability outputs only.

How does the FSEL pin behave during power-up or reset of 8N3DV85AC-0076CDI?

The FSEL pin has an internal 50 kΩ pulldown resistor, ensuring default selection of Frequency 0 at power-up before system control asserts a logic high. This guarantees predictable startup behavior: the 8N3DV85AC-0076CDI always begins outputting its first factory-programmed frequency until FSEL is actively driven high. No external pull-down is needed, and the 8N3DV85AC-0076CDI achieves stable output within 10 ms of VCC reaching regulation.