Analog Devices Inc./Maxim Integrated DS1090U-8/V+

Overview

The DS1090U-8/V+ from Maxim Integrated is a center-dithered, spread-spectrum silicon oscillator designed as an external clock source for switched-mode power supplies. It delivers a factory-programmed 500kHz–1MHz output frequency (prescaler = 8), supports 0–8% programmable dither amplitude via J0/J1 pins, and operates from 3.0V to 5.5V with CMOS/TTL-compatible output. Its primary role is EMI reduction in DC-DC converter timing circuits.

For engineers reviewing the DS1090U-8/V+ datasheet, DS1090U-8/V+ pinout, DS1090U-8/V+ application, or DS1090U-8/V+ equivalent, key selection criteria include confirmed dither rate options (fMOSC/512–4096), resistor-programmable master oscillator (45kΩ–91kΩ), guaranteed ±3% output frequency tolerance at +25°C, and validated operation across –40°C to +85°C.

Technical Context

The DS1090U-8/V+ integrates a voltage-controlled master oscillator (4–8MHz) biased by RSET, a fixed ÷8 factory prescaler, and a dual-stage dither generator. Dither rate is set by JC0/JC1 selecting division of fMOSC by 4/8/16/32, then further divided by 128 to yield fMOD = fMOSC/(Divisor × 128).

Dither amplitude (0%/2%/4%/8%) is controlled independently by J0/J1 through modulation of the triangle-wave amplitude applied to the master oscillator's bias path. Output duty cycle is specified at 45–55% for 4–8MHz outputs and 50% for lower frequencies.

Key Specifications

Pinout & Package

DS1090U-8/V+ is housed in an 8-pin µSOP package (2.0mm × 2.5mm, 0.5mm pitch) with exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar spread-spectrum oscillator applications.

Compared with Si5351A-B-GM and ICS843001AGI-01LFT, the DS1090U-8/V+ offers resistor-based frequency tuning and discrete-pin dither control without MCU dependency or complex interface, making it optimal for cost-sensitive, fixed-frequency EMI reduction in SMPS designs.

Availability

DS1090U-8/V+ is available at Aetrix Electronics and suitable for switched-mode power supplies, servers, printers, and industrial controls requiring stable component supply with guaranteed RoHS-compliant packaging and full traceability.

Supply support for DS1090U-8/V+ 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 semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1090U-8/V+ belongs to the EconOscillator™ family-designed specifically for low-cost, spread-spectrum clock generation in EMI-sensitive power conversion systems where simplicity and deterministic dither control are critical.

FAQ

What is the exact output frequency range of the DS1090U-8/V+?

The DS1090U-8/V+ provides a factory-programmed output frequency range of 500kHz to 1MHz. This is achieved by combining its internal 4–8MHz master oscillator (set via RSET resistor) with a fixed ÷8 prescaler. The actual frequency depends on the selected RSET value within 45kΩ–91kΩ, and is stable across the full operating temperature and voltage range.

How is dither amplitude programmed on the DS1090U-8/V+?

Dither amplitude on the DS1090U-8/V+ is programmed using pins J0 and J1, which form a 2-bit code: J0=0/J1=0 yields 0%, J0=1/J1=0 yields 2%, J0=0/J1=1 yields 4%, and J0=1/J1=1 yields 8%. These pins must be tied directly to GND or VCC-no intermediate voltages-to ensure reliable dither percentage selection per Table 2 in the datasheet.

Does the DS1090U-8/V+ require external configuration circuitry beyond RSET and control pins?

No, the DS1090U-8/V+ requires only an external RSET resistor (45kΩ–91kΩ to GND), proper VCC/GND decoupling (0.01µF + 0.1µF ceramics), and pull-up/pull-down connections on J0, J1, JC0, and JC1. There is no need for I²C, SPI, or microcontroller interaction-the device operates autonomously once powered and biased.

What is the power-up behavior of the DS1090U-8/V+?

The DS1090U-8/V+ exhibits a total power-up time (tPOR + tSTAB) of 0.1ms to 0.5ms, during which the internal oscillator stabilizes before the OUT pin becomes active. This delay (~500 clock cycles) ensures clean startup without glitches and is inherent to the design-no external reset or enable sequencing is required.

Can the DS1090U-8/V+ be used in automotive applications?

The DS1090U-8/V+ is specified for –40°C to +85°C operation and is not qualified to AEC-Q200 or automotive grade standards. While it may function in some under-hood or infotainment power supplies, Maxim does not guarantee performance or reliability in automotive environments-industrial and computing applications remain its validated use case.