Renesas 8N3Q001EG-105LCDI8

Overview

8N3Q001EG-105LCDI8 from Integrated Device Technology is a quad-frequency programmable crystal oscillator (XO) using fourth-generation FemtoClock® NG PLL technology. It delivers one LVPECL differential clock output, supports 2.5V/3.3V supply, operates from –40°C to +85°C, and provides factory-default frequencies selectable via FSEL0/FSEL1 pins - designed for wireless infrastructure baseband timing and telecom line-card synchronization.

For engineers reviewing the 8N3Q001EG-105LCDI8 datasheet, 8N3Q001EG-105LCDI8 pinout, 8N3Q001EG-105LCDI8 application, or 8N3Q001EG-105LCDI8 equivalent, this page details its I²C-programmable frequency synthesis (15.476 MHz–866.67 MHz / 975 MHz–1.3 GHz), RMS phase jitter (0.244 ps @156.25 MHz, integer PLL), LVPECL output drive, and 10-pin ceramic 5 mm × 7 mm package with OE control and dual frequency-select inputs.

Technical Context

The 8N3Q001EG-105LCDI8 integrates a 1950–2600 MHz VCO with fractional-N PLL architecture, using a 100 MHz or 114.285 MHz internal fundamental-mode crystal reference. Its four independent configuration registers (P₀–P₃, MINT₀–MINT₃, MFRAC₀–MFRAC₃, N₀–N₃) store pre-programmed divider settings selected by FSEL[1:0], enabling immediate frequency switching in ≤470 µs.

I²C interface (SCLK/SDATA) allows runtime reprogramming of all PLL dividers, supporting frequency resolution down to 435.9 Hz ÷ N. The device implements delta-sigma modulation for noise shaping and achieves low phase noise via high-reference-frequency multiplication - confirmed by –131.1 dBc/Hz @10 kHz offset at 156.25 MHz output.

Key Specifications

Pinout & Package

8N3Q001EG-105LCDI8 is housed in a lead-free (RoHS 6) 10-lead ceramic package measuring 5 mm × 7 mm × 1.55 mm (CD package). The body uses a standard top-view pinout with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-A-GM and 8A34001C-001NLGI, the 8N3Q001EG-105LCDI8 offers the lowest phase noise in integer PLL mode (0.244 ps), smallest footprint (5×7 mm), and simplest integration for single-LVPECL high-frequency applications - making it optimal for space-constrained telecom timing where jitter floor and layout simplicity are primary constraints.

Availability

8N3Q001EG-105LCDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport network line cards, and enterprise switch fabric timing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 8N3Q001EG-105LCDI8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The IDT8N3Q001 family targets programmable clock generation for next-generation wireless, optical, and high-speed datacom systems - delivering femtosecond-level jitter performance with field-reprogrammable flexibility in compact ceramic packages.

FAQ

What is the default output frequency configuration for 8N3Q001EG-105LCDI8?

The 8N3Q001EG-105LCDI8 is factory-programmed with four default frequencies corresponding to order code "105L" - indicating integer PLL mode with 100 MHz crystal reference and specific P/M/N register values. These defaults are loaded at power-up and selected via FSEL[1:0]; exact frequencies depend on the programmed dddd field and are documented in IDT's FemtoClock NG Ordering Product Information guide. The 8N3Q001EG-105LCDI8 supports reprogramming those defaults via I²C at any time.

Does 8N3Q001EG-105LCDI8 support both 2.5 V and 3.3 V operation simultaneously?

No, the 8N3Q001EG-105LCDI8 operates exclusively at either 2.5 V ±5% or 3.3 V ±5%, selected at manufacturing via Option Code (E = 3.3 V, F = 2.5 V). The 8N3Q001EG-105LCDI8 does not support dual-supply operation or automatic voltage detection. Power supply must be stable within specification across the full –40°C to +85°C range, and separate decoupling is required on VCC and VEE pins.

How is phase noise performance affected by PLL configuration in 8N3Q001EG-105LCDI8?

Phase noise in the 8N3Q001EG-105LCDI8 is significantly better in integer PLL mode (e.g., 0.244 ps RMS @156.25 MHz, 12 kHz–20 MHz) versus fractional mode (0.440 ps typical), due to elimination of delta-sigma modulation noise. Integer mode is enabled by setting DSM_ENA = 0 and ADC_EN = 0 - the default for order codes 1xxx (like 105L). The 8N3Q001EG-105LCDI8's datasheet confirms this trade-off between jitter floor and frequency granularity.

Can unused pins like DNU and SDATA be left floating on 8N3Q001EG-105LCDI8?

Yes - Pin 1 (DNU) must remain unconnected, and SDATA (Pin 9) may be left floating if I²C programming is not used, as stated in the Applications Information section. However, SCLK (Pin 10) has an internal pullup and can safely float; FSEL0/FSEL1 have internal pulldowns and OE has an internal pullup, so external resistors are optional but recommended for ESD robustness. The 8N3Q001EG-105LCDI8 datasheet explicitly permits this per Table 2 and Section 10.

What termination is required for the LVPECL outputs of 8N3Q001EG-105LCDI8?

The 8N3Q001EG-105LCDI8 LVPECL outputs (Q/nQ) require 50 Ω termination to VCC – 2 V - implemented via two 50 Ω resistors (Figure 1A) or Thevenin-equivalent networks (e.g., 84 Ω + 125 Ω). For 3.3 V supply, VCC – 2 V ≈ 1.3 V; for 2.5 V, it approximates GND. Improper termination causes signal integrity degradation and increased jitter. The 8N3Q001EG-105LCDI8 datasheet specifies this in Section 11 and Figure 1A/B, with measured VOH/VOL dependent on correct load.