Analog Devices Inc./Maxim Integrated DS1091LUB-027/V+T

Overview

DS1091LUB-027/V+T from Maxim Integrated is a factory-programmed, automotive-grade spread-spectrum oscillator delivering a down-dithered 27.0MHz clock output with ±1.75% frequency accuracy across -40°C to +125°C, 3.0V–3.6V supply operation, and pin-selectable dither magnitude (-2%, -4%, or -8%) and rate. It serves as an EMI-reduction timing source in infotainment systems, LCD displays, and industrial control units.

For engineers reviewing the DS1091LUB-027/V+T datasheet, DS1091LUB-027/V+T pinout, DS1091LUB-027/V+T application, or DS1091LUB-027/V+T equivalent, key selection criteria include its down-spread dither profile, automotive temperature qualification, µMAX® 8-pin package compatibility, and programmable dither rate via DR pin - all critical for noise-sensitive automotive and industrial clocking designs.

Technical Context

The DS1091LUB-027/V+T implements a triangle-wave modulated master oscillator architecture to generate down-dithered spread-spectrum output, where dither magnitude is set by SEL0/SEL1 logic states and dither rate depends on both fOUT and DR pin state per defined n-values (e.g., n = 11 for 27.0MHz). Its factory-trimmed core ensures no external calibration is required.

It operates exclusively in down-dither mode (unlike DS1091LUA variants), with dither percentages of 0%, –2%, –4%, or –8% relative to the programmed 27.0MHz center frequency. Power-up behavior holds OUT low for ≤0.1ms to prevent glitch propagation, and output drive meets CMOS-compatible VOH ≥2.4V / VOL ≤0.4V at ±4mA load.

Key Specifications

Pinout & Package

DS1091LUB-027/V+T is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), lead(Pb)-free and RoHS-compliant, with exposed pad connected to GND for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1091LUA-027/V+T, DS1091LUB-027/V+T offers asymmetric spectral spreading ideal for suppressing harmonics above carrier, while Si5351A-B-GM trades fixed-frequency simplicity for programmability and added complexity - making DS1091LUB-027/V+T optimal for cost-sensitive, production-ready automotive timing where EMI is the primary constraint.

Availability

DS1091LUB-027/V+T is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial HMI panels, and POS terminal baseboards requiring stable component supply with full AEC-Q200-aligned qualification and long-term lifecycle support.

Supply support for DS1091LUB-027/V+T 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 ICs for automotive, industrial, and communications markets, with emphasis on reliability and integration.

The DS1091LUB-027/V+T belongs to the EconOscillator™ family - engineered specifically to replace crystals and crystal oscillators in EMI-critical applications using low-cost, pin-configurable spread-spectrum clock generation.

FAQ

What is the exact output frequency and dither type of DS1091LUB-027/V+T?

The DS1091LUB-027/V+T is factory-programmed to deliver a precise 27.0MHz fundamental output frequency with down-spread spectrum modulation only - meaning its dither shifts frequency downward from 27.0MHz by 0%, –2%, –4%, or –8%, as selected by SEL0 and SEL1 pins. This differs from center-dither variants like DS1091LUA-027/V+T and is confirmed in the Ordering Information table and Detailed Description section of the datasheet.

Does DS1091LUB-027/V+T require external components for basic operation?

No, DS1091LUB-027/V+T operates autonomously with only two mandatory external components: 0.01µF and 0.1µF ceramic decoupling capacitors placed between VCC (pin 2) and GND (pin 3). No crystal, PLL loop filter, or trimming resistor is needed - its 27.0MHz output and dither parameters are fully factory-set and pin-configurable.

What is the meaning of "/V+T" in DS1091LUB-027/V+T?

In DS1091LUB-027/V+T, "/V" indicates automotive qualification (–40°C to +125°C operation, AEC-Q200 alignment), "+" denotes lead(Pb)-free and RoHS-compliant packaging, and "T" specifies tape-and-reel packaging format for automated SMT assembly. All three suffixes are present in the official Maxim ordering table and define the device's environmental rating, compliance status, and logistics form factor.

How is dither rate determined for DS1091LUB-027/V+T at 27.0MHz?

For DS1091LUB-027/V+T operating at 27.0MHz, the dither rate is calculated using the formula f_DITHER = f_OUT/2n, where n = 11 per Table 2. With DR = 1, f_DITHER = 27.0MHz/(2×11) ≈ 13.2kHz; with DR = 0, it halves to ~6.6kHz. This relationship is explicitly defined in the Dither Rate section and verified in Figure 1B and Table 2 of the datasheet.

Can DS1091LUB-027/V+T be used in non-automotive applications?

Yes, DS1091LUB-027/V+T can be deployed in industrial or commercial systems requiring robust 27.0MHz spread-spectrum timing - its –40°C to +125°C rating and 3.0V–3.6V supply tolerance exceed typical industrial requirements. However, its "/V" suffix reflects automotive qualification testing; users should verify whether full AEC-Q200 stress screening is necessary for their application, as non-automotive use does not invalidate functionality or reliability.