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Analog Devices Inc./Maxim Integrated DS1091LUB-027+T
- Part No.:
- DS1091LUB-027+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1091LUB-027+T.pdf
- Description:
- IC SS CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,986
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Product details
Overview
DS1091LUB-027+T from Maxim Integrated is a factory-programmed, down-dithered spread-spectrum oscillator delivering 27.0MHz output with ±0.25% nominal accuracy at +25°C, ±1.75% across -40°C to +125°C, and 3.0V–3.6V supply operation in an 8-pin µMAX® package. It serves as an EMI-reduction clock source for automotive infotainment and industrial control systems.
For engineers reviewing the DS1091LUB-027+T datasheet, DS1091LUB-027+T pinout, DS1091LUB-027+T application, or DS1091LUB-027+T equivalent, key selection criteria include dither type (down-only), programmable dither magnitude (-2%, -4%, -8%), dither rate selectability via DR pin, and automotive-grade temperature compliance.
Technical Context
The DS1091LUB-027+T implements a triangle-wave-modulated master oscillator architecture to generate down-dithered spread-spectrum output, where frequency deviation is strictly negative relative to the center frequency (27.0MHz). Dither magnitude is selected by SEL0/SEL1 logic states, and dither rate is determined by DR pin state and output frequency per defined n-value table.
It features a fixed 27.0MHz factory-programmed center frequency, operates only in down-dither mode (not center-dither), and requires no external configuration for basic functionality-only VCC, GND, and optional SEL0/SEL1/DR pull-up/down resistors for dither control. Power-up hold-low behavior ensures glitch-free initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 27.0MHz center frequency, down-dithered only (no center-dither option) |
| Frequency Accuracy | ±0.25% at +25°C; ±1.75% over full -40°C to +125°C range and 3.0V–3.6V supply |
| Dither Magnitude Options | PIN-selectable: 0%, -2%, -4%, or -8% (relative to 27.0MHz center) |
| Dither Rate Control | DR pin selects dither rate; for 27.0MHz fOUT, n = 11 → 13.2kHz (DR = 1) or 6.6kHz (DR = 0) |
| Supply Voltage | 3.0V to 3.6V DC; absolute max VCC = +6.0V |
| Output Drive | CMOS-compatible square wave; VOH ≥ 2.4V @ IOH = -4mA, VOL ≤ 0.4V @ IOL = 4mA |
| Package | 8-pin µMAX® (U8+1), RoHS-compliant, lead(Pb)-free |
Pinout & Package
DS1091LUB-027+T is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), with exposed pad thermally connected to ground. Pin 1 is OUT; pins 6 and 7 are no-connect (N.C.); all other pins have defined electrical roles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Spread-spectrum clock output | CMOS-level square wave; dithered downward from 27.0MHz; drives 15pF–50pF loads |
| 2 (VCC) | Power supply input | 3.0V–3.6V main supply; requires local 0.01µF + 0.1µF ceramic decoupling |
| 3 (GND) | Ground reference | Substrate-connected to ground; return path for all currents and decoupling |
| 4 (SEL1) | Dither magnitude MSB select | Logic input; combined with SEL0, selects -2%, -4%, or -8% dither depth |
| 5 (SEL0) | Dither magnitude LSB select | Logic input; defines exact dither percentage together with SEL1 per Table 1 |
| 6, 7 (N.C.) | No connection | Internally unconnected; must remain floating or grounded (not driven) |
| 8 (DR) | Dither rate selector | Logic input; sets dither modulation frequency (13.2kHz or 6.6kHz at 27.0MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Down-dithered spread-spectrum output | Reduces peak radiated emissions by spreading energy below 27.0MHz-critical for automotive EMC compliance |
| Automotive temperature range | Guaranteed operation from -40°C to +125°C enables use in engine bay, infotainment head units, and ADAS modules |
| Factory-programmed 27.0MHz center frequency | Eliminates need for external tuning components or configuration EEPROM; reduces BOM count and startup time |
| PIN-selectable dither parameters | Enables field-tunable EMI reduction without firmware or hardware changes-SEL0/SEL1/DR set dither depth and rate at power-on |
| Low-power active supply current | 16mA typical at 66.6MHz (measured at 3.6V, 25°C); scales with frequency and voltage for optimized system power budget |
Applications
| Automotive Infotainment Head Unit | Industrial PLC Timing Module |
|---|---|
Use Scenario: Clocking video processor, display interface, and audio codec in a vehicle head unit operating under wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary spread-spectrum clock generator providing EMI-compliant 27.0MHz reference to reduce radiated noise near FM radio bands. Use Value: Down-dithering lowers peak spectral energy by up to 14dB (at ±4% dither), easing CISPR 25 Class 5 radiated emissions certification. | Use Scenario: Synchronizing I/O scan cycles and communication peripherals in an industrial programmable logic controller deployed in factory environments. IC Role / Device Role / Timing Role: Stable, high-accuracy timing source tolerant of voltage ripple and thermal cycling between -40°C and +125°C. Use Value: ±1.75% frequency stability across temperature/voltage eliminates need for recalibration or external compensation circuits. |
| LCD Display Controller Timing | POS Terminal System Clock |
Use Scenario: Driving pixel clock and interface timing for automotive-grade TFT-LCD displays in digital instrument clusters. IC Role / Device Role / Timing Role: Low-jitter (0.3% RMS at 50MHz) CMOS clock source ensuring clean data sampling and reduced display artifacts. Use Value: 1.02ns rise time and 1.13ns fall time support fast edge rates required for high-resolution parallel RGB interfaces. | Use Scenario: Providing main system clock to ARM-based payment terminal SoC operating in retail environments with variable ambient temperatures. IC Role / Device Role / Timing Role: Automotive-qualified oscillator used in commercial-grade POS due to its robustness, long-term reliability, and AEC-Q200-aligned stress tolerance. Use Value: Lead(Pb)-free µMAX package and guaranteed 125°C operation enable extended service life and compatibility with lead-free reflow profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1091LUA-027+T | Center-dithered (±1%, ±2%, ±4%) instead of down-dithered; identical 27.0MHz center frequency, package, and supply specs | Suitable where symmetric spectral spreading around carrier is preferred (e.g., USB PHY clocking), not asymmetric EMI suppression below carrier | Select DS1091LUA-027+T only if center-dither behavior is explicitly required; DS1091LUB-027+T is not functionally interchangeable due to dither direction mismatch |
| Si5351A-B-GM | Programmable I²C clock generator (not factory-programmed); supports multiple outputs, fractional synthesis, but no built-in spread-spectrum dither | Used when flexible multi-frequency generation is needed, not fixed 27.0MHz with EMI reduction; requires host MCU and firmware | Choose Si5351A-B-GM only for designs needing dynamic frequency adjustment or multiple synchronized clocks; DS1091LUB-027+T offers simpler, lower-risk EMI solution with zero configuration |
Compared with DS1091LUA-027+T, DS1091LUB-027+T provides asymmetric spectral shaping ideal for suppressing harmonics below critical bands, while Si5351A-B-GM trades EMI simplicity for programmability-making DS1091LUB-027+T optimal for cost-sensitive, fixed-frequency automotive timing where dither direction matters.
Availability
DS1091LUB-027+T is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, LCD display controllers, and POS terminals requiring stable component supply across extended temperature ranges and strict EMI compliance.
Supply support for DS1091LUB-027+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 solutions for automotive, industrial, and communications markets.
The DS1091L series was developed specifically for EMI reduction in automotive electronics, combining factory-programmed accuracy with pin-configurable spread-spectrum dithering to meet stringent CISPR 25 requirements without added complexity.
FAQ
What is the center frequency and dither type of DS1091LUB-027+T?
The DS1091LUB-027+T is factory-programmed to a center frequency of 27.0MHz and operates exclusively in down-dither mode-meaning its output frequency sweeps downward from 27.0MHz by selectable magnitudes (0%, -2%, -4%, or -8%). It does not support center-dithering; that capability is reserved for the DS1091LUA variant. This down-dither behavior is hardwired into the DS1091LUB-027+T silicon.
How is dither magnitude selected on DS1091LUB-027+T?
Dither magnitude on DS1091LUB-027+T is selected using the logic states of SEL0 and SEL1 pins per Table 1 in the datasheet: SEL1=0/SEL0=0 yields 0% dither; SEL1=0/SEL0=1 gives -2%; SEL1=1/SEL0=0 gives -4%; and SEL1=1/SEL0=1 gives -8%. These pins are sampled at power-up and latched; no dynamic reconfiguration is supported during operation. The DS1091LUB-027+T does not interpret these pins as analog inputs or serial commands.
What is the dither rate for DS1091LUB-027+T at its 27.0MHz output?
For DS1091LUB-027+T's 27.0MHz output, the dither rate is determined by the DR pin and the n-value from Table 2: at 27.0MHz, n = 11. With DR = 1, dither rate = fOUT / (2 × n) = 27.0MHz / 22 ≈ 13.2kHz; with DR = 0, it is half that-6.6kHz. This modulation frequency is fixed per DR setting and cannot be adjusted beyond these two discrete values.
Does DS1091LUB-027+T require external components for basic operation?
No, DS1091LUB-027+T requires only VCC and GND connections for basic operation. However, Maxim recommends adding 0.01µF and 0.1µF ceramic decoupling capacitors close to pins 2 (VCC) and 3 (GND) to suppress supply noise and ensure stable dither performance. SEL0, SEL1, and DR pins may be tied high/low via resistors for static dither configuration-but are not mandatory for default (0% dither) operation.
Is DS1091LUB-027+T qualified for automotive applications?
Yes, DS1091LUB-027+T is explicitly rated for the automotive temperature range (-40°C to +125°C) and carries the "/V" qualification indicator in its ordering matrix (e.g., DS1091LUB-027/V+T). Its µMAX® package is lead(Pb)-free and RoHS-compliant, and it meets stress test conditions aligned with AEC-Q200 recommendations-including storage up to +125°C and soldering at +260°C (reflow).
DS1091LUB-027+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconOscillator™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Spread Spectrum Clock Generator
- PLL:
- No
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 27MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
DS1091LUB-027+T FAQ
1.How can I place an order for DS1091LUB-027+T through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1091LUB-027+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS1091LUB-027+T reliable?
The price and inventory of DS1091LUB-027+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1091LUB-027+T is usually 5 days.
3.What payment methods are accepted for DS1091LUB-027+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1091LUB-027+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1091LUB-027+T?
DS1091LUB-027+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1091LUB-027+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS1091LUB-027+T?
For technical support, including DS1091LUB-027+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1091LUB-027+T requirements.
6.How does Aetrix verify that DS1091LUB-027+T is sourced from the original manufacturer or authorized distributors?
All DS1091LUB-027+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1091LUB-027+T meets industry standards.
7.What is the process for return or replacement of DS1091LUB-027+T?
All DS1091LUB-027+T units undergo pre-shipment inspection (PSI). If there is an issue with DS1091LUB-027+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS1091LUB-027+T part is unused and in its original packaging.
Return procedure for DS1091LUB-027+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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