Renesas 8N4Q001LG-2182CDI

Overview

8N4Q001LG-2182CDI from Renesas (formerly IDT) is a quad-frequency programmable XO using fourth-generation FemtoClock® NG technology, delivering LVDS clock outputs from 15.476 MHz to 866.67 MHz and 975 MHz to 1,300 MHz with RMS phase jitter as low as 0.253 ps at 156.25 MHz (12 kHz–20 MHz), 2.5 V/3.3 V supply support, and -40°C to +85°C industrial temperature range. It serves as a high-precision timing source in wireless infrastructure baseband units.

For engineers reviewing the 8N4Q001LG-2182CDI datasheet, 8N4Q001LG-2182CDI pinout, 8N4Q001LG-2182CDI application, or 8N4Q001LG-2182CDI equivalent, key selection criteria include I²C-programmable frequency resolution (435.9 Hz ÷ N), four factory-default frequencies selectable via FSEL0/FSEL1, LVDS output compliance, fractional/integer PLL feedback mode selection, and RoHS-compliant 10-lead ceramic 5 mm × 7 mm package.

Technical Context

The 8N4Q001LG-2182CDI integrates a 100 MHz or 114.285 MHz fundamental-mode crystal oscillator driving a fractional-N PLL with 7-bit integer (MINT) and 18-bit fractional (MFRAC) feedback dividers, a 2-bit pre-divider (P), and a 7-bit post-divider (N). Its VCO operates at 1950–2600 MHz, enabling wide-range synthesis while maintaining low phase noise through delta-sigma noise shaping.

Frequency configuration is stored across four volatile I²C registers (P₀–P₃, MINT₀–MINT₃, MFRAC₀–MFRAC₃, N₀–N₃), each mapped to a unique FSEL[1:0] state. Power-up defaults are factory-programmed; runtime reprogramming via I²C allows dynamic switching between configurations without reset, with settling time of 470 µs after FSEL change.

Key Specifications

Pinout & Package

8N4Q001LG-2182CDI is housed in a lead-free 10-lead ceramic surface-mount package measuring 5 mm × 7 mm × 1.55 mm (CD package), optimized for thermal dissipation (θ_JA = 49.4°C/W at 0 m/s airflow) and high-frequency signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B-GM and AK210-01-156.2500T, the 8N4Q001LG-2182CDI uniquely balances hardware-selectable defaults (for deterministic boot), I²C programmability (for flexibility), and industrial-grade LVDS performance in a proven ceramic package-making it optimal for telecom infrastructure requiring both reliability and adaptability.

Availability

8N4Q001LG-2182CDI is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport networking, and enterprise switching applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 8N4Q001LG-2182CDI 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 trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets, formed through the acquisition of Integrated Device Technology (IDT) in 2019.

The 8N4Q001LG-2182CDI belongs to Renesas' FemtoClock® NG programmable oscillator product line, engineered specifically for high-speed communications infrastructure demanding sub-picosecond jitter, multi-frequency agility, and industrial environmental resilience.

FAQ

What is the default output frequency configuration for 8N4Q001LG-2182CDI?

The 8N4Q001LG-2182CDI is factory-programmed with four default frequencies determined by its order code suffix "2182", which corresponds to the 2xxx series indicating fractional PLL feedback and 114.285 MHz crystal reference. Specific default values are defined in the FemtoClock NG Ordering Product Information document and require consultation of the official Renesas ordering guide for exact frequencies assigned to 8N4Q001LG-2182CDI.

Does 8N4Q001LG-2182CDI support both 2.5 V and 3.3 V supply voltages simultaneously?

No, 8N4Q001LG-2182CDI operates on a single supply voltage-either 2.5 V ±5% or 3.3 V ±5%, selected at manufacturing via option code (B/F for 2.5 V; A/E/K for 3.3 V). The "L" in 8N4Q001LG-2182CDI indicates 3.3 V supply (option code K = ±20 ppm, 3.3 V), so 8N4Q001LG-2182CDI is configured for 3.3 V operation only and must not be powered with 2.5 V.

How is phase noise performance affected by PLL feedback mode in 8N4Q001LG-2182CDI?

In 8N4Q001LG-2182CDI, integer PLL feedback (default for 1xxx order codes) yields lower RMS phase jitter (e.g., 0.253 ps at 156.25 MHz) than fractional mode (0.440–0.995 ps), due to elimination of delta-sigma quantization noise. Since 8N4Q001LG-2182CDI uses a 2xxx order code, it is configured for fractional feedback and delivers higher resolution at the expense of slightly elevated broadband phase noise.

Can the I²C registers of 8N4Q001LG-2182CDI retain settings after power cycle?

No, the I²C configuration registers of 8N4Q001LG-2182CDI are volatile and reset to factory-default values on each power-up. To maintain custom frequency settings across power cycles, external non-volatile storage (e.g., microcontroller EEPROM) must store register values and reprogram 8N4Q001LG-2182CDI via I²C during system initialization.

What is the maximum allowable load capacitance for the LVDS outputs of 8N4Q001LG-2182CDI?

The 8N4Q001LG-2182CDI LVDS outputs (Q/nQ) are designed for standard 100 Ω differential termination. No explicit load capacitance limit is specified; however, the recommended termination network (100 Ω parallel resistor at receiver) and PCB trace impedance matching (Z₀ = 100 Ω differential) ensure signal integrity. Exceeding 2 pF total net capacitance may degrade edge rate and increase jitter, so keep stub lengths minimal and avoid capacitive loads beyond receiver input specs.