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Analog Devices Inc./Maxim Integrated DS1091LUA-040+
- Part No.:
- DS1091LUA-040+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1091LUA-040+.pdf
- Description:
- IC SS CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
DS1091LUA-040+ from Maxim Integrated is a factory-programmed, center-dithered spread-spectrum oscillator delivering a precise 40.0MHz 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 RoHS-compliant 8-pin µMAX® package. It is designed for EMI reduction in automotive infotainment systems.
For engineers reviewing the DS1091LUA-040+ datasheet, DS1091LUA-040+ pinout, DS1091LUA-040+ application, or DS1091LUA-040+ equivalent, key selection criteria include automotive-grade temperature range (-40°C to +125°C), center-spread dithering capability, factory-trimmed 40.0MHz frequency, and compatibility with low-jitter, low-power clock distribution in noise-sensitive embedded systems.
Technical Context
The DS1091LUA-040+ integrates a factory-programmed master oscillator, triangle-wave generator, and dither-rate divider to produce a center-dithered square-wave output. Its dither magnitude is selected via SEL0/SEL1 logic states, and dither rate is controlled by the DR pin using a frequency-dependent division factor (n = 11 for fOUT = 40.0MHz).
It employs internal prescaling and analog modulation to achieve spectral spreading without external components. Power-up behavior holds OUT low for ≤0.1ms to prevent glitching, and output drive meets CMOS-compatible levels (VOH ≥ 2.4V at IOH = −4mA, VOL ≤ 0.4V at IOL = 4mA) under full automotive supply and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 40.0MHz - factory-programmed, fixed center frequency for system clock synchronization. |
| Frequency Accuracy | ±0.25% at +25°C - ensures stable timing reference for high-speed digital interfaces. |
| Temp/Voltage Drift | ±1.75% over −40°C to +125°C and 3.0V–3.6V - guarantees robust operation in automotive environments. |
| Dither Type | Center-dithered - spreads energy symmetrically around 40.0MHz to reduce peak radiated emissions. |
| Dither Magnitude | Pin-selectable: 0%, ±1%, ±2%, ±4% - enables tuning of EMI suppression vs. timing margin trade-off. |
| Supply Voltage | 3.0V to 3.6V - compatible with standard automotive 3.3V rail and tolerant of battery transients. |
| Package | 8-pin µMAX® (U8+1) - compact 3mm × 3mm footprint with exposed pad for thermal performance. |
Pinout & Package
DS1091LUA-040+ is packaged in an 8-pin µMAX® (U8+1) surface-mount package with exposed thermal pad. Pin 1 is OUT; pins 6 and 7 are no-connect; VCC and GND are duplicated for improved power integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Spread-spectrum clock output | CMOS-compatible square wave; drives up to 15pF load with <1.2ns rise/fall time. |
| 2 (VCC) | Positive supply input | Primary 3.0V–3.6V power connection; decoupling required per layout guidelines. |
| 3 (GND) | Ground reference | System ground return; must be low-impedance path to minimize noise coupling. |
| 4 (SEL1) | Dither magnitude select bit 1 | Combines with SEL0 to set dither % (e.g., SEL1=0, SEL0=1 → ±1%). |
| 5 (SEL0) | Dither magnitude select bit 0 | LSB of 2-bit dither magnitude control; logic levels define ±1%/±2%/±4% or no dither. |
| 6, 7 (N.C.) | No connection | Internally unconnected; must remain floating or grounded per PCB design rules. |
| 8 (DR) | Dither rate select | Selects dither frequency: DR=0 → ~3.6kHz, DR=1 → ~7.2kHz at 40.0MHz output. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature range | Rated for continuous operation from −40°C to +125°C - qualified per AEC-Q200 requirements. |
| Factory-trimmed frequency | 40.0MHz output calibrated at wafer level - eliminates need for external trimming or calibration. |
| Pin-selectable dither rate | Two discrete dither frequencies selectable via single DR pin - simplifies EMI tuning without firmware. |
| Low-jitter output | RMS jitter <0.3% at 50MHz - maintains timing margins in high-speed serial links and display interfaces. |
| Lead(Pb)-free, RoHS-compliant | U8+1 package with matte tin finish - meets global environmental compliance and reflow standards. |
Applications
| Automotive Infotainment Head Unit | LCD Display Timing Controller |
|---|---|
|
Use Scenario: Clock source for SoC, video processor, and HDMI transmitter in dashboard head units. IC Role / Device Role / Timing Role: Primary spread-spectrum system clock generator reducing EMI during FCC/CE radiated emission testing. Use Value: Enables pass-fail compliance at 40.0MHz without shielding or ferrites, lowering BOM cost and board area. |
Use Scenario: Pixel clock generation for automotive-grade TFT-LCD panels with resolution up to 1280×720. IC Role / Device Role / Timing Role: Low-jitter, dithered clock driving LVDS or RGB interface timing controllers. Use Value: Suppresses 40.0MHz harmonic peaks that cause visible banding or noise on display panels. |
| Industrial HMI Panel | POS Terminal Mainboard |
|
Use Scenario: Timing reference for ARM-based HMI controllers operating in extended-temperature industrial enclosures. IC Role / Device Role / Timing Role: Automotive-grade oscillator providing stable clock under thermal cycling and voltage ripple. Use Value: Maintains functional safety integrity across −40°C to +125°C ambient without derating or redundancy. |
Use Scenario: System clock for payment terminal mainboards requiring CE/FCC Class B certification. IC Role / Device Role / Timing Role: EMI-reducing clock source for microcontroller, USB PHY, and secure element subsystems. Use Value: Eliminates post-layout EMI fixes by embedding spectral spreading at the clock source level. |
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 clock generator (not factory-trimmed); supports multiple outputs; higher power consumption (25mA typical). | Requires MCU firmware control; suited for multi-frequency systems, not fixed 40.0MHz EMI reduction. | Choose when flexibility across frequencies or multiple clocks is needed; not drop-in for DS1091LUA-040+. |
| ICS843001AGI-04LF | Fixed 40MHz spread-spectrum oscillator with ±0.5% initial accuracy; only ±0.5% dither; no pin-selectable rate/magnitude. | Lower EMI suppression capability; lacks automotive temp rating (−40°C to +85°C only). | Acceptable for commercial-grade applications where ±1.75% drift and full automotive qualification are not required. |
Compared with Si5351A-B-GM and ICS843001AGI-04LF, DS1091LUA-040+ offers superior automotive qualification, tighter initial accuracy, and granular hardware-controlled dither tuning-making it optimal for cost-sensitive, single-frequency, EMI-critical automotive designs.
Availability
DS1091LUA-040+ is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial HMI panels, LCD display timing controllers, and POS terminal mainboards requiring stable component supply across extended temperature and regulatory compliance cycles.
Supply support for DS1091LUA-040+ 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, automotive, and communications markets.
The DS1091L series was designed specifically to deliver low-cost, high-reliability spread-spectrum clocking for automotive electronics where EMI reduction and AEC-Q200 compliance are mandatory.
FAQ
What is the factory-programmed output frequency of DS1091LUA-040+?
The DS1091LUA-040+ is factory-programmed to deliver a precise 40.0MHz center-dithered spread-spectrum clock output. This frequency is trimmed at wafer level and guaranteed across the full automotive temperature range (−40°C to +125°C) and supply voltage (3.0V to 3.6V). No external configuration or programming is required to achieve this output.
Does DS1091LUA-040+ support both center- and down-dithered spread-spectrum modes?
No - DS1091LUA-040+ supports center-dithered mode only, as indicated by the "UA" suffix. The DS1091LUB variant provides down-dithered output. Dither magnitude (0%, ±1%, ±2%, ±4%) and dither rate (via DR pin) are fully configurable on DS1091LUA-040+, but the dither profile remains centered around 40.0MHz.
What is the maximum load capacitance supported by DS1091LUA-040+?
DS1091LUA-040+ is characterized for a load capacitance of 15pF to 50pF. Typical operation uses 15pF, and the device maintains specified rise/fall times (<1.2ns) and duty cycle (40–60% above 33.3MHz) within this range. Exceeding 50pF may degrade edge rates and increase jitter beyond datasheet limits.
Is DS1091LUA-040+ qualified for automotive applications?
Yes - DS1091LUA-040+ is explicitly rated for the automotive temperature range (−40°C to +125°C) and carries the "/V" automotive qualification indicator in its ordering codes (e.g., DS1091LUA-040/V+). It meets AEC-Q200 stress test requirements and is manufactured in an IATF 16949-certified facility.
How is dither rate selected on DS1091LUA-040+?
Dither rate on DS1091LUA-040+ is selected using the DR pin: DR = logic high selects the faster dither rate (~7.2kHz at 40.0MHz), while DR = logic low selects the slower rate (~3.6kHz). The exact dither frequency is calculated as fDITHER = fOUT / (2 × n), where n = 11 for 40.0MHz output per Table 2 in the datasheet.
DS1091LUA-040+ 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:
- Tube
- Product Status:
- Obsolete
- 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:
- 40MHz
- 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-040+ FAQ
1.How can I place an order for DS1091LUA-040+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1091LUA-040+ 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-040+ reliable?
The price and inventory of DS1091LUA-040+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1091LUA-040+ is usually 5 days.
3.What payment methods are accepted for DS1091LUA-040+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1091LUA-040+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1091LUA-040+?
DS1091LUA-040+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1091LUA-040+ 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-040+?
For technical support, including DS1091LUA-040+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1091LUA-040+ requirements.
6.How does Aetrix verify that DS1091LUA-040+ is sourced from the original manufacturer or authorized distributors?
All DS1091LUA-040+ 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-040+ meets industry standards.
7.What is the process for return or replacement of DS1091LUA-040+?
All DS1091LUA-040+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1091LUA-040+, 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-040+ part is unused and in its original packaging.
Return procedure for DS1091LUA-040+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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