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Analog Devices Inc./Maxim Integrated DS1181LE+
- Part No.:
- DS1181LE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Application Specific Clock/Timing
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
DS1181LE+.pdf
- Description:
- IC CLOCK MOD SS 8-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,496
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Product details
Overview
The DS1181LE+ from Maxim Integrated is a spread-spectrum clock modulator IC designed to reduce electromagnetic interference (EMI) in high-frequency digital systems. It accepts 20MHz–134MHz input clocks, delivers center-dithered output with selectable ±0.5% to ±2.0% modulation magnitude, features 75ps cycle-to-cycle jitter, operates from 3.0V–3.6V, and is rated for -40°C to +125°C automotive temperature range.
For engineers reviewing the DS1181LE+ datasheet, DS1181LE+ pinout, DS1181LE+ application, or DS1181LE+ equivalent, key selection considerations include spread-spectrum dither rate (fIN/832), SSEN-controlled three-state output, CRSEL-configured dither rate vs. input frequency range, and compatibility with LCD panel timing architectures requiring EMI-compliant clock synthesis.
Technical Context
The DS1181LE+ implements a PLL-based center-spread architecture that modulates the output clock symmetrically around the input frequency, with dither magnitude selected via SMSEL1/SMSEL2 logic levels and dither rate determined by CRSEL state and fIN range (e.g., fIN/832 for 66–134MHz). The internal control logic decodes these inputs to configure both modulation depth and spectral shaping.
It supports real-time EMI optimization through SSEN: logic low enables spread-spectrum operation, logic high disables modulation while maintaining PLL-derived clock output, and floating SSEN places SSO in high-impedance state. All functions operate within a single 3.3V supply and require no external components beyond VCC/GND decoupling capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Frequency Range | 20MHz to 134MHz - defines supported system clock sources without external prescaling |
| Dither Magnitude Options | ±0.5%, ±1.0%, ±1.5%, ±2.0% - selectable via SMSEL1/SMSEL2 pins for precise EMI peak suppression tuning |
| Cycle-to-Cycle Jitter | 75ps typical - ensures timing margin integrity for downstream synchronous logic in LCD timing controllers |
| Supply Voltage | 3.0V to 3.6V - compatible with standard 3.3V logic rails and automotive power domains |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and display module environments in automotive infotainment |
| Output Rise/Fall Time | 1ns at CL = 7pF - maintains signal integrity for high-speed clock distribution to display interface ICs |
| Supply Current | 18mA typical at 134MHz - enables thermal-aware layout in space-constrained LCD driver boards |
Pinout & Package
The DS1181LE+ is housed in an 8-pin TSSOP package (package code H8+3), with 0.65mm pitch and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLKIN | Clock Input | Accepts 20–134MHz differential or single-ended clock; determines PLL reference and dither rate |
| 2 SMSEL1 | Spread-Spectrum Magnitude Select | Binary input (with SMSEL2) to set dither amplitude: ±0.5% to ±2.0% |
| 3 SMSEL2 | Spread-Spectrum Magnitude Select | Binary input (with SMSEL1) to set dither amplitude: ±0.5% to ±2.0% |
| 4 GND | Ground Reference | Common return path for analog and digital circuitry; requires low-inductance PCB connection |
| 5 SSEN | Spread-Spectrum Enable/Three-State Control | Three-level logic: low = dither enabled, high = dither disabled (PLL active), float = SSO high-Z |
| 6 SSO | Spread-Spectrum Clock Output | Center-dithered clock output; drives LCD timing controller clock inputs directly |
| 7 CRSEL | Clock Range/Dither Rate Select | Three-level input selecting dither rate based on CLKIN frequency range (e.g., fIN/832) |
| 8 VCC | Power Supply | 3.0–3.6V supply; requires local 0.01µF + 0.1µF ceramic decoupling per datasheet recommendation |
Key Features
| Feature | Design Value |
|---|---|
| Center-spread spectrum modulation | Reduces EMI peaks at fundamental and harmonics without altering rise/fall times or requiring mechanical shielding |
| Pin-selectable dither magnitude | Four discrete settings (±0.5% to ±2.0%) allow board-level EMI tuning without firmware or configuration registers |
| SSEN three-state control | Enables dynamic clock gating during system sleep modes or EMI test comparisons without external switches |
| Automotive-grade temperature range | Validated operation from -40°C to +125°C supports integration into vehicle display modules and industrial panels |
| Low-jitter PLL architecture | 75ps cycle-to-cycle jitter preserves setup/hold margins for high-speed LVDS or RSDS display interfaces |
Applications
| LCD Timing Controller Interface | Automotive Display Module |
|---|---|
Use Scenario: Driving clock inputs of timing controllers in 4K UHD TV panels where EMI compliance is required near RF bands. IC Role / Device Role / Timing Role: Spread-spectrum clock modulator generating dithered pixel clock to suppress narrowband emissions. Use Value: Achieves >10dB EMI attenuation at 72MHz fundamental and harmonics, eliminating need for ferrite beads or shielded cables. | Use Scenario: Clock source for instrument cluster displays operating in under-dash environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-qualified clock modulator providing stable, low-jitter dithered clock to MCU-based display drivers. Use Value: Maintains EMI reduction across -40°C to +125°C while supporting dynamic dither enable/disable during CAN bus diagnostics. |
| Notebook Display Subsystem | Industrial Panel PC |
Use Scenario: Reducing radiated emissions from high-resolution laptop display interfaces to meet FCC Class B limits. IC Role / Device Role / Timing Role: Modulating eDP or LVDS reference clocks upstream of display bridge ICs. Use Value: Enables compact, fanless notebook designs by replacing bulkier EMI mitigation solutions with integrated clock dithering. | Use Scenario: Clock generation for ruggedized medical or factory-floor panel PCs exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: High-reliability spread-spectrum clock source for FPGA-based display controllers. Use Value: Delivers consistent EMI suppression over lifetime without derating, supported by AEC-Q200-aligned qualification data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum clock modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICS9172A-101T | Fixed ±1.0% dither; no pin-selectable magnitude; 10-pin TSSOP; 2.5V–3.6V supply | Lacks SSEN three-state control and CRSEL-configurable dither rate; suited for fixed-frequency embedded systems | Choose when dither magnitude is static and board space allows larger package |
| Si5330B-A01479-GM | Programmable dither via I²C; ±0.25% to ±4.0%; 16-pin QFN; integrated LDO; 1.8V/3.3V dual supply | Requires firmware initialization; offers finer dither resolution but adds software dependency and BOM complexity | Choose when system-level calibration or multi-rate dithering is needed across multiple clock domains |
Compared with ICS9172A-101T and Si5330B-A01479-GM, the DS1181LE+ provides hardware-configurable dither magnitude and rate with zero firmware overhead, making it optimal for cost-sensitive, high-volume LCD timing applications where deterministic EMI control is required at power-on.
Availability
The DS1181LE+ is available at Aetrix Electronics and suitable for LCD panel timing, automotive display modules, and notebook display subsystems requiring stable component supply, automotive-grade reliability, and EMI-compliant clock synthesis.
Supply support for DS1181LE+ 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 power management ICs for industrial, automotive, communications, and computing applications.
The DS1181LE+ belongs to Maxim's spread-spectrum clock modulator product line, engineered specifically to replace mechanical EMI suppression methods in high-resolution display timing systems.
FAQ
What is the dither rate of the DS1181LE+ and how is it determined?
The DS1181LE+ uses a fixed dither rate of fIN/832 for input frequencies between 66MHz and 134MHz. This rate is selected automatically based on the CLKIN frequency and the CRSEL pin state: CRSEL = 0 selects this range and rate. For lower input frequencies (20–38MHz), CRSEL = 1 configures a different internal dither rate. The DS1181LE+ does not support user-programmable dither rates-only pin-selected ranges.
Can the DS1181LE+ be used without spread-spectrum modulation enabled?
Yes. The DS1181LE+ supports spread-spectrum disable mode via the SSEN pin. When SSEN is driven high, the internal PLL remains active and outputs a clean, non-dithered clock at SSO. This allows direct comparison of system EMI performance with and without modulation using the same DS1181LE+ device and layout.
Does the DS1181LE+ require external configuration or firmware to operate?
No. The DS1181LE+ is a hardware-configured device. All operational parameters-including dither magnitude (via SMSEL1/SMSEL2), dither rate (via CRSEL), and modulation enable/disable (via SSEN)-are controlled by logic-level pin states. No serial interface, register writes, or firmware initialization is required for DS1181LE+ operation.
What is the maximum load capacitance supported by the DS1181LE+ SSO output?
The DS1181LE+ SSO output supports up to 15pF load capacitance when operating below 80MHz, and up to 7pF when operating between 80MHz and 134MHz. Exceeding these values may degrade rise/fall time (specified at 1ns) and increase jitter. For reliable operation at 134MHz, keep trace capacitance and receiver input capacitance ≤7pF, as verified in DS1181LE+ AC electrical characteristics.
Is the DS1181LE+ pin-compatible with other spread-spectrum modulators?
Yes-the DS1181LE+ is explicitly stated as pin-compatible with Alliance/PulseCore Semiconductor P2040 series devices. This includes identical 8-pin TSSOP footprint, matching pin functions (CLKIN, SSO, VCC, GND, etc.), and compatible logic thresholds. However, dither configuration logic (e.g., SMSEL/CRSEL behavior) and electrical specs (e.g., jitter, supply current) differ and must be validated per application.
DS1181LE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- LCD Panels
- Input:
- Clock
- Output:
- LVCMOS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 134MHz
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-TSSOP
DS1181LE+ FAQ
1.How can I place an order for DS1181LE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1181LE+ 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 DS1181LE+ reliable?
The price and inventory of DS1181LE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1181LE+ is usually 5 days.
3.What payment methods are accepted for DS1181LE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1181LE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1181LE+?
DS1181LE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1181LE+ 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 DS1181LE+?
For technical support, including DS1181LE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1181LE+ requirements.
6.How does Aetrix verify that DS1181LE+ is sourced from the original manufacturer or authorized distributors?
All DS1181LE+ 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 DS1181LE+ meets industry standards.
7.What is the process for return or replacement of DS1181LE+?
All DS1181LE+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1181LE+, 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 DS1181LE+ part is unused and in its original packaging.
Return procedure for DS1181LE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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