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Analog Devices Inc./Maxim Integrated DS1089LU-A29+
- Part No.:
- DS1089LU-A29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1089LU-A29+.pdf
- Description:
- IC CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS1089LU-A29+ from Maxim Integrated is a factory-programmed 3.3V spread-spectrum clock generator producing a dithered square-wave output at 29MHz center frequency with ±4% modulation, operating from -40°C to +85°C in an 8-pin µSOP package. It integrates a 33.3–66.6MHz master oscillator, I²C-compatible programming interface, nonvolatile EEPROM storage, and hardware control pins for output enable (OE), power-down (PDN), and dither enable (SPRD). It is used in cable modems and POS terminals to reduce EMI.
For engineers reviewing the DS1089LU-A29+ datasheet, DS1089LU-A29+ pinout, DS1089LU-A29+ application, or DS1089LU-A29+ equivalent, key selection considerations include its fixed 29MHz center frequency, ±4% dither amplitude, fMOSC/2048 dither rate, 3.3V supply range (2.7–3.6V), and 8-pin µSOP (118 mil) package with I²C programmability and glitchless output control.
Technical Context
The DS1089LU-A29+ implements a factory-trimmed silicon oscillator core generating a stable 29MHz center frequency, with bidirectional triangle-wave modulation applied directly to the master oscillator bias circuit to achieve precise ±4% dither amplitude. Its dither rate is set to fMOSC/2048 via J1/J0 bits, yielding ~14.16kHz modulation when fMOSC = 29MHz.
Configuration is retained in nonvolatile EEPROM and accessed via I²C interface (400kHz fast-mode compatible), supporting software- or hardware-gated output control through OE and PDN pins. The device supports prescaler division down to 130kHz and maintains constant duty cycle across voltage and temperature variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency | 29MHz - factory-programmed master oscillator frequency, stable ±0.75% over voltage and ±0.75% over 0°C to +85°C. |
| Dither Amplitude | ±4% - symmetric frequency deviation around 29MHz, set by J3/J2 = 10 per ADDR register. |
| Dither Rate | fMOSC/2048 ≈ 14.16kHz - modulation frequency determined by J1/J0 = 01, enabling effective EMI spreading. |
| Supply Voltage | 2.7V to 3.6V - operates across full 3.3V rail tolerance; ICC active = 12mA max at fOUT = fMOSCmax. |
| Output Drive | VOH ≥ 2.4V @ -4mA, VOL ≤ 0.4V @ 4mA - CMOS-compatible square-wave output with 50% duty cycle. |
| Power-Down Current | 10µA max - achieved when PDN = low; enables ultra-low standby power in battery-sensitive systems. |
| I²C Interface | 400kHz fast-mode - supports standard I²C addressing (A2/A1/A0 configurable), with EEPROM write time of 10–20ms. |
Pinout & Package
DS1089LU-A29+ is housed in an 8-pin µSOP package (118 mil width), RoHS-compliant, with GND-connected substrate and surface-mount land pattern optimized for high-frequency stability and minimal parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Oscillator Output | CMOS square-wave output; glitchless enable/disable via OE/PDN; 50% duty cycle maintained across VCC and temperature. |
| 2 - SPRD | Dither Enable Control | Active-high signal enabling triangle-wave modulation; dither disabled when low, no effect on center frequency stability. |
| 3 - VCC | Power Supply | 3.3V nominal input (2.7–3.6V range); requires 0.01µF + 0.1µF ceramic decoupling close to pin. |
| 4 - GND | Ground Reference | Substrate-connected ground plane; serves as return path for oscillator core, I²C, and output buffer. |
| 5 - OE | Output Enable | Hardware gate for OUT; high = enabled, low = high-Z (if LO/HIZ bit = 0) or driven low (if LO/HIZ = 1). |
| 6 - PDN | Power-Down Control | Active-low master oscillator disable; requires ≥2 output cycles + 10µs persistence for glitch-free entry/exit. |
| 7 - SDA | I²C Serial Data | Open-drain bidirectional line; supports 400kHz fast-mode; requires external pull-up (typically 4.7kΩ). |
| 8 - SCL | I²C Serial Clock | Input-only clock line; synchronizes register reads/writes; timing compliant with I²C specification. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Center Frequency | 29MHz center frequency laser-trimmed at wafer test; eliminates need for external crystal or trimming components. |
| Symmetric Spread-Spectrum Modulation | ±4% dither amplitude centered precisely on 29MHz - ensures EMI reduction without shifting spectral energy outside regulatory bands. |
| Nonvolatile Configuration Storage | All settings (dither %, dither rate, prescaler, address, OE mode) stored in EEPROM - enables true stand-alone operation after initial programming. |
| Glitchless Output Control | Synchronous enable/disable logic ensures zero-output-glitch transitions on OE and PDN - critical for noise-sensitive digital systems. |
| Hardware + Software Output Gating | OE pin OR'ed with OE bit in ADDR register - allows flexible control: hardware override during boot, software reconfiguration in runtime. |
Applications
| Cable Modems | POS Terminals |
|---|---|
Use Scenario: High-speed DOCSIS data transmission requiring low-EMI clocking for QAM demodulators and MAC processors. IC Role / Device Role / Timing Role: Primary spread-spectrum clock source for baseband ASICs and PHY layers, replacing fixed-frequency oscillators to meet FCC Part 15 Class B radiated emissions limits. Use Value: ±4% dither at 29MHz reduces peak spectral energy by >10dB compared to undithered clock, eliminating costly shielding or filter redesign. |
Use Scenario: Compact retail point-of-sale terminals with integrated thermal printers and barcode scanners operating in dense electromagnetic environments. IC Role / Device Role / Timing Role: System clock generator for ARM-based controller and peripheral interfaces (USB, UART, SPI), synchronized to host processor timing domain. Use Value: 8-pin µSOP footprint and 10µA power-down current enable space-constrained, battery-backed designs while maintaining EMI compliance during active and standby modes. |
| Computer Peripherals | Printers |
Use Scenario: USB 2.0 hubs and docking stations requiring clean, low-jitter clocks for packet timing and link training. IC Role / Device Role / Timing Role: Spread-spectrum reference clock for USB transceivers and bridge controllers, configured via I²C during enumeration. Use Value: I²C programmability allows dynamic dither adjustment per host system requirements; factory 29MHz setting ensures plug-and-play compatibility. |
Use Scenario: Laser and inkjet printers with high-resolution image processing pipelines and motor control subsystems. IC Role / Device Role / Timing Role: Master clock for image rasterization engine and page buffer memory interface, operating under variable thermal load. Use Value: ±0.75% frequency stability over -40°C to +85°C ensures consistent print throughput and avoids timing-induced banding artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5351A-B-GM | Programmable 3-output clock generator (8kHz–200MHz), I²C-configurable, no factory preset; requires external crystal; higher pin count (10-pin QFN). | Used where multi-frequency synthesis or multiple independent clocks are needed; not drop-in for single-output fixed-frequency use. | Select Si5351A-B-GM only if design requires >1 clock output or field-adjustable frequencies beyond 29MHz ±4%. |
| ICS843002AGI-01LFT | Fixed 29.4912MHz LVDS output, no dither, no I²C interface, 3.3V, 8-pin SOIC; ±50ppm stability, no power-down mode. | Used in legacy systems requiring deterministic jitter and LVDS signaling; lacks EMI reduction capability and low-power features. | Choose ICS843002AGI-01LFT only when LVDS output, zero modulation, and absence of programmability are system requirements. |
Compared with Si5351A-B-GM and ICS843002AGI-01LFT, DS1089LU-A29+ delivers optimized EMI reduction for cost-sensitive single-output applications, combines factory calibration with nonvolatile programmability, and provides hardware power-control pins absent in both alternatives - making it ideal for volume consumer electronics where layout simplicity and regulatory compliance are prioritized.
Availability
DS1089LU-A29+ is available at Aetrix Electronics and suitable for cable modems, POS terminals, and computer peripherals requiring stable component supply, EMI-compliant clock generation, and long-term lifecycle support.
Supply support for DS1089LU-A29+ 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability timing solutions for industrial, communications, and consumer markets.
The DS1089L family was designed as a low-cost, single-chip spread-spectrum clock generator targeting EMI reduction in cost-sensitive digital systems - eliminating crystals, trim caps, and external logic while retaining configurability and robustness.
FAQ
What is the factory-programmed center frequency of the DS1089LU-A29+?
The DS1089LU-A29+ is factory-programmed to a precise 29MHz center frequency, derived from its internal master oscillator. This value is laser-trimmed during production and remains stable within ±0.75% over temperature (–40°C to +85°C) and supply voltage (2.7V to 3.6V). The "A29" suffix explicitly denotes this 29MHz setting, and it cannot be altered post-manufacture.
Does the DS1089LU-A29+ support I²C communication, and what is its maximum speed?
Yes, the DS1089LU-A29+ supports standard and fast-mode I²C communication up to 400kHz. Its SDA and SCL pins comply with I²C timing specifications, including tLOW, tHIGH, and tSU:DAT. The device uses a 7-bit slave address configurable via A2/A1/A0 pins, and all register writes (including PRESCALER and ADDR) are acknowledged. EEPROM writes complete in 10–20ms after a STOP condition.
How is the ±4% dither amplitude implemented and verified in the DS1089LU-A29+?
The ±4% dither amplitude in DS1089LU-A29+ is implemented by configuring J3/J2 bits to "10" in the ADDR register, which adjusts the triangle-wave generator's modulation depth relative to the master oscillator bias current. This setting is verified at wafer test and guaranteed across temperature and voltage. Spectral measurements confirm symmetrical spreading centered exactly at 29MHz, with no duty cycle distortion.
Can the DS1089LU-A29+ operate in stand-alone mode without I²C connection?
Yes, the DS1089LU-A29+ operates fully stand-alone after initial configuration: SDA and SCL may be tied high (with pull-ups) if no in-circuit reprogramming is required. All settings - including ±4% dither, fMOSC/2048 rate, and OE behavior - are retained in nonvolatile EEPROM. The device powers up with output disabled until 512 master clock cycles elapse for stabilization.
What is the power-down current consumption of the DS1089LU-A29+, and how is it activated?
The DS1089LU-A29+ draws ≤10µA in power-down mode, achieved by driving the PDN pin low. This disables both the master oscillator and output buffer. To ensure glitch-free entry, the PDN low state must persist for at least two output cycles plus 10µs. Recovery requires PDN high followed by 512 master clock cycles before OUT becomes active - a delay inherent to oscillator stabilization.
DS1089LU-A29+ 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:
- Active
- Programmable:
- Not Verified
- Type:
- Clock Generator
- PLL:
- No
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 66MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
DS1089LU-A29+ FAQ
1.How can I place an order for DS1089LU-A29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1089LU-A29+ 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 DS1089LU-A29+ reliable?
The price and inventory of DS1089LU-A29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1089LU-A29+ is usually 5 days.
3.What payment methods are accepted for DS1089LU-A29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1089LU-A29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1089LU-A29+?
DS1089LU-A29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1089LU-A29+ 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 DS1089LU-A29+?
For technical support, including DS1089LU-A29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1089LU-A29+ requirements.
6.How does Aetrix verify that DS1089LU-A29+ is sourced from the original manufacturer or authorized distributors?
All DS1089LU-A29+ 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 DS1089LU-A29+ meets industry standards.
7.What is the process for return or replacement of DS1089LU-A29+?
All DS1089LU-A29+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1089LU-A29+, 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 DS1089LU-A29+ part is unused and in its original packaging.
Return procedure for DS1089LU-A29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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