Analog Devices Inc./Maxim Integrated DS4077L-GDN

Overview

DS4077L-GDN from Maxim Integrated is a 106.25MHz voltage-controlled crystal oscillator (VCXO) module in a 9-pin LGA package, operating from 3.135V to 3.465V with LVDS differential output, ±69ppm absolute pull range, and 0.8ps RMS jitter (12kHz–20MHz). It delivers low-phase-noise timing for telecom base station clock-data recovery and wireless infrastructure reference clocking.

For engineers reviewing the DS4077L-GDN datasheet, DS4077L-GDN pinout, DS4077L-GDN application, or DS4077L-GDN equivalent, key selection criteria include its LVDS output compliance, 106.25MHz nominal frequency, ±110ppm tuning range at +25°C, VC control voltage interface (0.3V–2.8V), and 14mm × 9mm × 3.06mm plastic LGA footprint.

Technical Context

The DS4077L-GDN integrates a fundamental-mode quartz crystal with a proprietary oscillator IC to generate stable, tunable reference clocks. Its VC input modulates varactor bias to adjust oscillation frequency within ±69ppm APR, while internal regulation maintains low sensitivity to supply (±11.5ppm/VDD) and load (±1ppm/pF) variations.

Designed specifically for high-speed serial link timing, it supports LVDS output with 250–400mV differential swing, 100Ω impedance matching, and guaranteed rise/fall times ≤150ps. Phase noise is specified at –125dBc/Hz @ 1kHz offset, enabling use in SONET/SDH, CPRI, and IEEE 1588-compliant systems requiring sub-picosecond jitter integrity.

Key Specifications

Pinout & Package

DS4077L-GDN uses a 9-pin transfer-molded plastic LGA package (package code L949A-1, document 21-0265), with exposed thermal pad on underside for enhanced heat dissipation and ground continuity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si510-106M250 and AK2-106M250, DS4077L-GDN uniquely balances ±69ppm APR, 0.8ps RMS jitter, and LVDS output in a thermally optimized LGA package - making it optimal for telecom CDR and PTP boundary clock designs demanding both precision and tunability.

Availability

DS4077L-GDN is available at Aetrix Electronics and suitable for SONET/SDH line cards, CPRI radio units, and 10G Ethernet switches requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for DS4077L-GDN 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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and timing solutions for communications, industrial, and computing markets.

The DS4077 series belongs to Maxim's high-performance timing portfolio, engineered specifically for telecom infrastructure applications demanding ultra-low jitter, wide tuning range, and robust environmental operation.

FAQ

What is the recommended power supply decoupling for DS4077L-GDN?

DS4077L-GDN requires a minimum 100nF ceramic capacitor placed within 2mm of pin 6 (VDD) and a bulk 10µF tantalum or ceramic capacitor near the device. This dual-stage decoupling suppresses supply-induced jitter and ensures stable LVDS output swing across temperature and load conditions. The DS4077L-GDN datasheet specifies that inadequate decoupling increases RMS jitter beyond 0.8ps.

Does DS4077L-GDN support LVDS termination internally?

No, DS4077L-GDN does not integrate internal LVDS termination. It requires external 100Ω differential termination to VDD/2 on the PCB, as specified in the "LVDS OUTPUT" section of the electrical characteristics table. The DS4077L-GDN output driver is designed for 100Ω load impedance, and omitting this termination causes signal reflection and increased jitter.

What is the maximum VC control voltage slew rate supported by DS4077L-GDN?

The DS4077L-GDN specifies a VC input bandwidth of 10kHz, meaning it supports control voltage changes up to ~63krad/s (10kHz × 2π). Faster slew rates may cause frequency overshoot or instability. For closed-loop PLL applications, the DS4077L-GDN VC port should be driven through a low-pass filter with cutoff ≤10kHz to maintain lock integrity.

Can DS4077L-GDN operate at frequencies outside its 106.25MHz nominal rating?

No - DS4077L-GDN is factory-trimmed and calibrated specifically for 106.25MHz operation. While its ±69ppm APR allows tuning around that center (±7.33kHz), it cannot be reconfigured for other nominal frequencies like 77.76MHz or 122.88MHz. Those require distinct part numbers (e.g., DS4077L-0DN or DS4077L-BDN).

Is the thermal pad on DS4077L-GDN electrically connected?

Yes, the exposed thermal pad on the underside of the DS4077L-GDN LGA package is internally connected to VSS (pin 3). It must be soldered to a solid PCB ground plane to ensure proper thermal dissipation, low-impedance grounding, and minimal phase noise degradation. The DS4077L-GDN package drawing confirms this connection in the mechanical outline.