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Analog Devices Inc./Maxim Integrated DS1091LUA-027+T
- Part No.:
- DS1091LUA-027+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1091LUA-027+T.pdf
- Description:
- IC SS CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,538
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Product details
Overview
DS1091LUA-027+T from Maxim Integrated is a factory-programmed, center-dithered spread-spectrum oscillator delivering a precise 27.0MHz output with ±0.25% nominal accuracy at +25°C and ±1.75% across -40°C to +125°C. It operates from 3.0V to 3.6V, features pin-selectable dither magnitude (0%, ±1%, ±2%, ±4%) and dither rate, and is housed in an 8-pin µMAX® package. It is designed for EMI reduction in automotive infotainment systems.
For engineers reviewing the DS1091LUA-027+T datasheet, DS1091LUA-027+T pinout, DS1091LUA-027+T application, or DS1091LUA-027+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade temperature performance, and real-world selection guidance for spread-spectrum clocking in noise-sensitive embedded systems.
Technical Context
The DS1091LUA-027+T implements a factory-trimmed master oscillator with integrated triangle-wave generator and dither-rate divider to produce center-spread output. Its dither profile is controlled by SEL0/SEL1 logic states and DR pin configuration, with dither rate calculated as fDITHER = fOUT/n where n depends on output frequency band (e.g., n = 11 for 27.0MHz).
It uses internal prescaling and analog modulation to shift output energy across a defined bandwidth-achieving up to 14dB spectral attenuation at ±4% dither-while maintaining tight frequency stability over supply (±1.2% across 3.0V–3.6V) and temperature (±1.75% over -40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 27.0MHz - factory-programmed center frequency, fixed for this variant. |
| Frequency Accuracy | ±0.25% at +25°C - ensures stable timing reference for synchronous digital interfaces. |
| Temperature Range | -40°C to +125°C - qualified for under-hood and display module deployment in automotive systems. |
| Supply Voltage | 3.0V to 3.6V - compatible with automotive 3.3V rail without level-shifting. |
| Dither Magnitude | Pin-selectable 0%, ±1%, ±2%, ±4% - enables EMI peak suppression tuning without firmware changes. |
| Output Rise/Fall Time | 1.02ns / 1.13ns at 12pF - supports clean edge integrity for high-speed logic clocking. |
| Power-Up Time | 0.1ms - guarantees glitch-free startup before system initialization begins. |
Pinout & Package
DS1091LUA-027+T is packaged in an 8-pin µMAX® (U8+1) surface-mount package with exposed pad grounded internally. Pin 1 is OUT; pins 6 and 7 are no-connect; VCC and GND are duplicated for low-impedance power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | CMOS-compatible spread-spectrum clock output; drives 15pF–50pF loads with 50% duty cycle below 33.3MHz. |
| 2, 4 | VCC | Primary and auxiliary 3.0V–3.6V supply inputs; require local 0.01µF + 0.1µF ceramic decoupling. |
| 3 | GND | Ground reference for all internal circuitry and output driver; tied to substrate. |
| 5 | SEL0 | LSB of dither magnitude select; sets ±1%/±2%/±4% or 0% when combined with SEL1. |
| 8 | DR | Dither rate control; selects fOUT/11 (DR=1) or fOUT/12 (DR=0) for 27.0MHz output. |
Key Features
| Feature | Design Value |
|---|---|
| Center-dithered spread spectrum | Reduces radiated EMI peaks by up to 14dB at ±4% dither, enabling compliance with CISPR 25 Class 5 in automotive displays. |
| Automotive temperature qualification | Guaranteed operation from -40°C to +125°C with full parameter validation - eliminates derating calculations for engine bay or dashboard modules. |
| Pin-selectable dither configuration | Four dither magnitudes and two dither rates set via SEL0/SEL1/DR logic levels - no I²C or configuration firmware required. |
| Factory-trimmed frequency | 27.0MHz output calibrated at wafer test; eliminates post-solder calibration or external trimming components. |
| Low-power active mode | 16mA typical supply current at 66.6MHz (3.6V, +25°C); scales with frequency and voltage per datasheet curves. |
Applications
| Automotive Infotainment Display | Industrial LCD Controller |
|---|---|
|
Use Scenario: Timing source for TFT-LCD pixel clock in head-unit display modules operating near RF receivers. IC Role / Device Role / Timing Role: Spread-spectrum clock generator providing 27.0MHz pixel clock with center dither to suppress narrowband EMI coupling into AM/FM bands. Use Value: Enables CISPR 25-compliant design without shielding or ferrite beads, reducing BOM cost and board area. |
Use Scenario: Clocking engine for industrial HMI panels exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-grade oscillator delivering stable 27.0MHz timing across -40°C to +125°C for display controller ASICs. Use Value: Eliminates need for external temperature compensation or recalibration, improving long-term display timing reliability. |
| POS Terminal Baseboard | Automotive Instrument Cluster |
|
Use Scenario: Synchronizing high-resolution barcode scanner interface and touchscreen controller in retail POS terminals. IC Role / Device Role / Timing Role: Low-jitter (0.3% RMS at 50MHz), spread-spectrum clock source minimizing crosstalk between parallel data buses and touch digitizer lines. Use Value: Prevents visual artifacts and touch misreads caused by clock-induced noise on shared PCB layers. |
Use Scenario: Driving graphics processor and CAN gateway timing in digital instrument clusters with LED backlight drivers. IC Role / Device Role / Timing Role: Single 27.0MHz spread-spectrum reference synchronizing display rendering and communication subsystems. Use Value: Reduces common-mode noise injection into sensitive analog sensor signal paths (e.g., fuel level, temperature). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5351A-B-GM | Programmable I²C-based clock generator; supports multiple outputs and fractional synthesis; requires external crystal and configuration firmware. | Used where multi-frequency flexibility or synchronization across domains is needed; not drop-in for fixed 27MHz SS. | Select Si5351A-B-GM only if programmability justifies added software overhead and BOM complexity. |
| ICS8430I-27T | Fixed 27MHz spread-spectrum oscillator with ±0.5% initial accuracy and -40°C to +85°C range; no pin-selectable dither options. | Suitable for commercial-grade displays but lacks automotive temperature margin and dither tuning. | Choose ICS8430I-27T only for non-automotive applications where extended temperature range and dither control are unnecessary. |
Compared with Si5351A-B-GM and ICS8430I-27T, DS1091LUA-027+T delivers automotive-qualified temperature performance, pin-configurable dither, and factory-calibrated accuracy without firmware or external components-making it optimal for cost-sensitive, EMI-critical automotive timing where fixed frequency suffices.
Availability
DS1091LUA-027+T is available at Aetrix Electronics and suitable for automotive infotainment, industrial LCD controllers, and POS terminal designs requiring stable component supply with guaranteed automotive temperature qualification and EMI-reduction capability.
Supply support for DS1091LUA-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 ICs for automotive, industrial, and communications markets.
The DS1091L series was developed specifically to provide low-cost, pin-configurable spread-spectrum clocking for EMI-sensitive automotive displays and control units - replacing discrete crystal + PLL solutions with integrated, qualified oscillators.
FAQ
What is the factory-programmed output frequency of DS1091LUA-027+T?
The DS1091LUA-027+T is factory-programmed to deliver a precise 27.0MHz center-dithered spread-spectrum clock output. This frequency is trimmed during wafer test and is not user-adjustable. The "-027" suffix explicitly denotes the 27.0MHz configuration, and the device does not support reprogramming in-system or via external interface.
Does DS1091LUA-027+T support both center and down dither modes?
No - DS1091LUA-027+T supports center dither only, as indicated by the "UA" suffix (DS1091LUA = center-dither variant). Down-dither functionality is exclusive to DS1091LUB variants (e.g., DS1091LUB-027+T). The DS1091LUA-027+T's SEL0/SEL1 pins configure dither magnitude as ±1%, ±2%, ±4%, or 0%, always centered around 27.0MHz.
What is the maximum load capacitance supported by DS1091LUA-027+T?
The DS1091LUA-027+T is specified for load capacitances from 15pF to 50pF, with AC characteristics (duty cycle, rise/fall time, jitter) guaranteed across that range. Driving loads beyond 50pF may degrade edge rate and increase jitter; for heavier loads, a buffer stage is recommended. The 15pF–50pF range covers standard CMOS inputs and most FPGA/ASIC clock receivers.
How is dither rate selected on DS1091LUA-027+T?
Dither rate on DS1091LUA-027+T is selected using the DR pin: DR = logic high selects fDITHER = fOUT/11 ≈ 2.45MHz, while DR = logic low selects fDITHER = fOUT/12 ≈ 2.25MHz for the 27.0MHz output. This relationship is derived from Table 2 in the datasheet, where n = 11 for fOUT = 27.0MHz in the 16.668–33.333MHz band.
Is DS1091LUA-027+T RoHS-compliant and lead(Pb)-free?
Yes - the "+" suffix in DS1091LUA-027+T indicates a lead(Pb)-free and RoHS-compliant µMAX® package (U8+1). The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and is qualified for reflow soldering at up to +260°C peak temperature, as documented in the Absolute Maximum Ratings table.
DS1091LUA-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
DS1091LUA-027+T FAQ
1.How can I place an order for DS1091LUA-027+T through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1091LUA-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 DS1091LUA-027+T reliable?
The price and inventory of DS1091LUA-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 DS1091LUA-027+T is usually 5 days.
3.What payment methods are accepted for DS1091LUA-027+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1091LUA-027+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1091LUA-027+T?
DS1091LUA-027+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1091LUA-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 DS1091LUA-027+T?
For technical support, including DS1091LUA-027+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1091LUA-027+T requirements.
6.How does Aetrix verify that DS1091LUA-027+T is sourced from the original manufacturer or authorized distributors?
All DS1091LUA-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 DS1091LUA-027+T meets industry standards.
7.What is the process for return or replacement of DS1091LUA-027+T?
All DS1091LUA-027+T units undergo pre-shipment inspection (PSI). If there is an issue with DS1091LUA-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 DS1091LUA-027+T part is unused and in its original packaging.
Return procedure for DS1091LUA-027+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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