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Analog Devices Inc./Maxim Integrated DS1085LZ-5B2+
- Part No.:
- DS1085LZ-5B2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1085LZ-5B2+.pdf
- Description:
- IC ECONOSCILLATOR SYNTH 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,365
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Product details
Overview
DS1085LZ-5B2+ from Maxim Integrated (now Analog Devices) is a user-programmable dual-output frequency synthesizer IC with nonvolatile EEPROM configuration, operating from a single 5V supply. It delivers synchronous, independently programmable outputs: OUT0 reference oscillator (8.2MHz–133MHz) and OUT1 main oscillator (8.1kHz–133MHz), with 0.75% absolute frequency accuracy and three selectable step sizes (10/25/50kHz). It serves as a standalone clock source or dynamically reconfigurable timing peripheral in embedded control and communication systems.
For engineers reviewing the DS1085LZ-5B2+ datasheet, DS1085LZ-5B2+ pinout, DS1085LZ-5B2+ application, or DS1085LZ-5B2+ equivalent, key selection considerations include its dual-synchronous output architecture, 2-wire serial programmability, power-down mode with glitch-free enable, factory-default 101.8MHz master oscillator, and SO-8 (150mil) package compatibility with legacy DS1085Z variants.
Technical Context
The DS1085LZ-5B2+ integrates a digitally controlled master oscillator (66–133MHz) with a 10-bit DAC and 5-bit OFFSET register to achieve precise frequency synthesis across overlapping ranges. Its dual-path architecture uses independent prescalers (P0/P1, ÷1/2/4/8) feeding separate output paths: OUT0 directly from P0, and OUT1 via P1 followed by a 10-bit programmable divider (N = 2–1025) or bypass (DIV1 = 1).
Control is implemented through an I²C-compatible 2-wire interface (SCL/SDA) supporting both standard (100kHz) and fast (400kHz) modes. Multifunction pins CTRL0 and CTRL1 support configurable output enable, mux select, and OR-connected power-down - enabling low-power operation without external circuitry while ensuring synchronous, glitch-free output transitions on enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency Range | OUT0: 8.2MHz–133MHz; OUT1: 8.1kHz–133MHz - enables clocking of microcontrollers, ADCs, and serial interfaces across wide timing requirements |
| Frequency Accuracy | ±0.75% absolute - eliminates need for external calibration in cost-sensitive industrial applications |
| Step Size | 50kHz - matches DS1085Z-50 variant; defines minimum frequency increment for DAC programming |
| Master Oscillator Range | 66MHz–133MHz - provides stable high-frequency reference for generating sub-MHz and multi-hundred-MHz outputs |
| Supply Voltage | 4.75V–5.25V - compatible with standard 5V logic rails and tolerant of typical board-level ripple |
| Power-Down Current | 5mA - reduces system standby power without requiring full device reset or reinitialization |
| I²C Interface Speed | Up to 400kHz - supports rapid in-system frequency updates during runtime or boot-time configuration |
Pinout & Package
DS1085LZ-5B2+ is housed in an 8-pin SOIC package (150mil width), pin-compatible with industry-standard SO-8 footprints and thermally optimized for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Main oscillator output | Delivers final synthesized frequency (8.1kHz–133MHz); driven by P1 prescaler and N divider (or bypassed) |
| OUT0 | Reference oscillator output | Provides high-frequency reference (8.2MHz–133MHz); sourced directly from P0 prescaler |
| VCC | Positive power supply | Single 5V rail powers internal oscillator, logic, and output drivers; no auxiliary supplies required |
| GND | Ground reference | Common return path for all analog and digital circuitry; requires low-impedance PCB connection |
| CTRL0 | Configurable control input | Programmable as OUT0 enable, MUX select, or global power-down (with CTRL1 OR logic) |
| CTRL1 | Configurable control input | Programmable as OUT1 enable or global power-down; complements CTRL0 for flexible system control |
| SDA | 2-wire serial data I/O | Open-drain bidirectional line for I²C read/write operations; supports standard/fast mode protocols |
| SCL | 2-wire serial clock input | Master-generated clock synchronizing all register access; tolerates 100kHz/400kHz frequencies |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous outputs | OUT0 and OUT1 share master oscillator clock domain but operate at independently programmed frequencies - eliminates inter-channel skew in multi-clock systems |
| Nonvolatile frequency storage | All DAC, OFFSET, P0/P1, and N settings retained in EEPROM - enables plug-and-play operation without host MCU initialization |
| Glitch-free output enable | CTRL0/CTRL1 assert outputs only after stable clock edge - prevents metastability or false triggers in downstream logic |
| No external timing components | Self-contained oscillator core requires no crystals, capacitors, or inductors - reduces BOM count and layout complexity |
| Smart power-down mode | OR-connected CTRL0/CTRL1 inputs disable both outputs before shutting down master oscillator - ensures clean state transition and <5mA quiescent current |
Applications
| Industrial PLC Timing | Legacy Microcontroller Clocking |
|---|---|
Use Scenario: Synchronizing I/O scan cycles and communication buses in programmable logic controllers where deterministic timing margins are critical. IC Role / Device Role / Timing Role: Primary clock generator providing stable, field-reprogrammable system clock and auxiliary timer reference. Use Value: 0.75% accuracy and nonvolatile storage eliminate recalibration after power loss; dual outputs reduce need for discrete clock buffers. | Use Scenario: Replacing fixed-frequency crystal oscillators in aging 8-bit/16-bit MCU designs requiring minor clock rate adjustments for peripheral interoperability. IC Role / Device Role / Timing Role: Drop-in programmable oscillator substitute with identical SO-8 footprint and 5V interface compatibility. Use Value: Factory-programmed 101.8MHz default frequency matches DS1085Z-50 spec; 50kHz step size enables precise tuning to meet UART or SPI baud rate requirements. |
| Test Equipment Signal Generation | Communications Baseband Clocking |
Use Scenario: Generating variable test clocks for digital pattern generators and logic analyzers where frequency agility improves test coverage. IC Role / Device Role / Timing Role: Programmable reference source supporting rapid frequency sweeps via I²C under host controller command. Use Value: 400kHz I²C interface allows sub-millisecond frequency updates; 8.1kHz–133MHz range covers common digital test frequencies without external dividers. | Use Scenario: Providing synchronized clocks to ADC/DAC pairs and baseband processors in wired/wireless modems and gateways. IC Role / Device Role / Timing Role: Dual-output timing hub delivering matched phase-reference (OUT0) and data-path clock (OUT1) from shared oscillator. Use Value: Synchronous outputs ensure zero inter-channel jitter accumulation; 15pF–50pF load tolerance accommodates varied PCB trace capacitances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar frequency synthesizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1085Z-50+ | Identical 50kHz step size and SO-8 package; differs only in temperature grade (0°C to +70°C vs. -40°C to +85°C for DS1085LZ-5B2+) | Not rated for extended industrial temperature range; unsuitable for outdoor or high-ambient environments | Select DS1085Z-50+ only for commercial-grade applications where ambient stays within 0°C–70°C |
| Si5351A-B-GM | 3-output CMOS clock generator with integrated PLL; wider frequency range (8kHz–200MHz); requires external crystal; no nonvolatile memory | Needs external 25MHz crystal and configuration firmware; lacks true drop-in capability due to different pinout and power sequencing | Choose Si5351A-B-GM when >2 outputs or higher frequency resolution (ppb-level) is required, accepting added design complexity |
Compared with DS1085Z-50+, DS1085LZ-5B2+ adds extended temperature operation and enhanced reliability screening, while Si5351A-B-GM trades simplicity and nonvolatility for greater flexibility and output count - making DS1085LZ-5B2+ optimal for robust, self-contained dual-clock systems.
Availability
DS1085LZ-5B2+ is available at Aetrix Electronics and suitable for industrial automation, legacy MCU upgrades, test equipment, and communications infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for DS1085LZ-5B2+ 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
Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and timing solutions for high-reliability industrial and communications systems.
The DS1085 product line delivers programmable, self-contained clock synthesis for applications demanding field-configurable timing without external components - targeting cost-sensitive, space-constrained embedded systems.
FAQ
What is the default output frequency of DS1085LZ-5B2+ at power-up?
The DS1085LZ-5B2+ powers up with a factory-programmed default master oscillator frequency of 101.8MHz, configured per the DS1085Z-50 variant specification. This value is stored nonvolatively in EEPROM and determines initial OUT0 and OUT1 frequencies based on default prescaler (P0=P1=1) and divider (N=1025) settings. The actual output frequencies can be verified using the DAC word (08h), OFFSET byte (0Eh), and MUX register (02h) contents read via the 2-wire interface.
Does DS1085LZ-5B2+ require an external crystal or resonator?
No, DS1085LZ-5B2+ does not require any external timing components. It contains a fully integrated, user-programmable master oscillator (66–133MHz) with internal DAC and OFFSET control. All frequency generation - including both OUT0 and OUT1 outputs - is derived solely from this on-chip oscillator, prescalers, and dividers. This eliminates BOM cost, layout area, and reliability risks associated with external crystals or capacitors.
Can DS1085LZ-5B2+ generate sub-1MHz frequencies on OUT1?
Yes, DS1085LZ-5B2+ can generate frequencies as low as 8.1kHz on OUT1 by combining the master oscillator (minimum 66MHz), P1 prescaler (÷8), and the 10-bit programmable divider (N = 2–1025). For example, with a 66MHz master clock, P1 = ÷8 (8.25MHz), and N = 1025, OUT1 = 8.05kHz - meeting the specified 8.1kHz lower limit. The DIV1 bit also allows bypassing the divider entirely for direct prescaled output.
How does the power-down mode function on DS1085LZ-5B2+?
DS1085LZ-5B2+ enters power-down mode when either CTRL0 or CTRL1 is asserted low with their respective PDN0 or PDN1 bits enabled in the MUX register. Both control pins are internally OR-connected, so asserting either disables both outputs first, then shuts down the master oscillator. Total supply current drops to 5mA, and the device retains all register settings in EEPROM. Recovery requires deasserting the control pin and waiting ~500µs for output stabilization - no reprogramming is needed.
Is DS1085LZ-5B2+ pin-compatible with other DS1085 variants?
Yes, DS1085LZ-5B2+ is pin-compatible with all DS1085Z-series devices in the 8-pin SOIC (150mil) package, including DS1085Z-10+, DS1085Z-25+, and DS1085Z-50+. Pin functions (OUT1, OUT0, VCC, GND, CTRL0, CTRL1, SDA, SCL) and electrical characteristics are identical. The primary differences lie in step size (10/25/50kHz), default DAC/OFFSET values, and temperature grade - all of which are software-configurable and do not affect physical layout or interface compatibility.
DS1085LZ-5B2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconOscillator™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Frequency Synthesizer
- PLL:
- No
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:2
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 66MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
DS1085LZ-5B2+ FAQ
1.How can I place an order for DS1085LZ-5B2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1085LZ-5B2+ 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 DS1085LZ-5B2+ reliable?
The price and inventory of DS1085LZ-5B2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1085LZ-5B2+ is usually 5 days.
3.What payment methods are accepted for DS1085LZ-5B2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1085LZ-5B2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1085LZ-5B2+?
DS1085LZ-5B2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1085LZ-5B2+ 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 DS1085LZ-5B2+?
For technical support, including DS1085LZ-5B2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1085LZ-5B2+ requirements.
6.How does Aetrix verify that DS1085LZ-5B2+ is sourced from the original manufacturer or authorized distributors?
All DS1085LZ-5B2+ 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 DS1085LZ-5B2+ meets industry standards.
7.What is the process for return or replacement of DS1085LZ-5B2+?
All DS1085LZ-5B2+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1085LZ-5B2+, 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 DS1085LZ-5B2+ part is unused and in its original packaging.
Return procedure for DS1085LZ-5B2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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