Analog Devices Inc./Maxim Integrated DS4212AN+

Overview

DS4212AN+ from Maxim Integrated is a 212.5MHz LVPECL-output ceramic surface-mount clock oscillator with ±39ppm total frequency stability, 0.9ps RMS phase jitter (12kHz–20MHz), and operation over -40°C to +85°C. It uses a fundamental crystal with PLL-based synthesis in a 5.0mm × 3.2mm × 1.49mm 10-pin LCCC package, designed for Fibre Channel host bus adapters requiring low-jitter timing.

For engineers reviewing the DS4212AN+ datasheet, DS4212AN+ pinout, DS4212AN+ application, or DS4212AN+ equivalent, key selection criteria include its LVPECL output drive capability, 3.3V ±10% supply compatibility, active-high OE control, 10-pin LCCC mechanical footprint, and guaranteed phase jitter performance across industrial temperature range.

Technical Context

The DS4212AN+ integrates a fundamental-mode quartz crystal with a low-noise digital PLL comprising a phase/frequency detector (PFD) and voltage-controlled oscillator (VCO), followed by programmable divider circuitry and an LVPECL output buffer. Its architecture delivers precise 212.5MHz output without external loop filtering.

It supports output disable via active-high OE pin, placing the LVPECL outputs in high-impedance state when disabled. The device operates from a single 3.0V–3.6V supply, draws 50mA typical unloaded current, and maintains frequency stability against temperature (±30ppm), supply variation (±3ppm/V), and load changes (±1ppm).

Key Specifications

Pinout & Package

DS4212AN+ is housed in a 10-pin LCCC ceramic surface-mount package measuring 5.0mm × 3.2mm × 1.49mm, with non-connected exposed paddle (EP) on underside. Pin 1 is OE (active-high output enable); pins 2 and 7–10 are no-connect; pin 3 is GND; pins 4 and 5 are differential LVPECL outputs (OUTP/OUTN); pin 6 is V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS4212BN+ and Si510-212M500, DS4212AN+ uniquely delivers LVPECL-compatible differential drive, sub-1ps jitter, and active-high OE control in a compact ceramic LCCC-making it the only option qualified for 4G Fibre Channel HBA and switch line-card designs requiring industrial temperature resilience.

Availability

DS4212AN+ is available at Aetrix Electronics and suitable for Fibre Channel host bus adapters, RAID controllers, and enterprise storage subsystems requiring stable component supply, low-phase-jitter timing, and industrial-temperature operation.

Supply support for DS4212AN+ 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) designs precision analog, mixed-signal, and timing solutions for industrial, communications, and computing applications.

The DS4-XO series-including DS4212AN+-was engineered specifically for high-speed serial data links demanding ultra-low jitter, tight frequency stability, and robust operation in space-constrained storage and networking hardware.

FAQ

What output type does DS4212AN+ provide, and how is it terminated?

DS4212AN+ provides LVPECL output. It requires 100Ω termination between OUTP and OUTN, referenced to V_CC−2V. This configuration ensures correct logic levels (V_OH ≈ V_CC−0.88V, V_OL ≈ V_CC−1.62V) and optimal jitter performance. The DS4212AN+ datasheet specifies this termination scheme explicitly for LVPECL mode, and deviation may increase phase noise or cause signal integrity issues in high-speed links.

Does DS4212AN+ support output disable, and what happens to the outputs when disabled?

Yes, DS4212AN+ supports output disable via its active-high OE pin. When OE is driven low or grounded, the LVPECL outputs (OUTP/OUTN) enter a high-impedance state-effectively disconnecting the clock signal from the load. This feature enables dynamic clock gating in power-sensitive systems. The DS4212AN+ specification confirms that output disable current remains below 100µA, minimizing standby power draw without affecting startup time or frequency accuracy upon re-enable.

What is the guaranteed phase jitter performance of DS4212AN+, and over what offset range is it measured?

DS4212AN+ guarantees 0.9ps RMS phase jitter measured from 12kHz to 20MHz offset from the 212.5MHz carrier. This value is specified in the Electrical Characteristics table and validated across the full -40°C to +85°C operating range. The DS4212AN+ achieves this performance using a low-noise PLL architecture with fundamental crystal resonance, making it suitable for 4G Fibre Channel applications where jitter directly impacts bit-error rate and link margin.

What package type and dimensions does DS4212AN+ use, and is the exposed paddle electrically connected?

DS4212AN+ uses a 10-pin LCCC ceramic package measuring 5.0mm × 3.2mm × 1.49mm. The exposed paddle (EP) is non-functional and must not be electrically connected-it serves only as a thermal mass and mechanical anchor. Maxim's datasheet explicitly states "Do not connect this pad or place exposed metal under the pad." Proper PCB land pattern design per Maxim document 21-0389 ensures reliable solder joint formation and thermal dissipation without shorting.

How does DS4212AN+ achieve its 212.5MHz output frequency, and is it based on a fundamental or overtone crystal?

DS4212AN+ achieves 212.5MHz using a fundamental-mode quartz crystal combined with an integrated low-noise PLL. The functional diagram in the DS4212AN+ datasheet shows the crystal driving a PFD/VCO loop, with divider circuitry scaling the VCO output to the final frequency. This architecture avoids overtone crystals or external multiplication stages, delivering superior phase noise and jitter compared to overtone-based oscillators. The DS4212AN+ specification confirms fundamental crystal usage in the General Description section.