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Analog Devices Inc./Maxim Integrated DS1085LZ-12B2+
- Part No.:
- DS1085LZ-12B2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
DS1085LZ-12B2+.pdf
- Description:
- IC ECONOSCILLATOR SYNTH 8-SOIC
- Quantity:
- Payment:
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Inventory:2,547
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Product details
Overview
DS1085LZ-12B2+ from Maxim Integrated (now Analog Devices) is a dual-output, nonvolatile, user-programmable frequency synthesizer IC with independent 8.1kHz–133MHz main oscillator (OUT1) and 8.2MHz–133MHz reference oscillator (OUT0) outputs, 0.75% absolute frequency accuracy, and 2-wire serial interface for in-circuit reprogramming - used in embedded timing control, programmable clock generation, and processor-peripheral synchronization.
For engineers reviewing the DS1085LZ-12B2+ datasheet, DS1085LZ-12B2+ pinout, DS1085LZ-12B2+ application, or DS1085LZ-12B2+ equivalent, key selection considerations include its dual synchronous outputs, EEPROM-stored configuration, 5V single-supply operation, power-down mode via CTRL0/CTRL1, and factory-default 10kHz step resolution enabling precise frequency synthesis without external components.
Technical Context
The DS1085LZ-12B2+ integrates a 66–133MHz internal master oscillator controlled by a 10-bit DAC and OFFSET register, feeding two independent prescalers (P0 and P1, each selectable divide-by-1/2/4/8) and a 10-bit programmable divider (N = 2–1025) for OUT1. Its architecture enables glitch-free, synchronous output enable/disable via dedicated CTRL0 and CTRL1 pins with constant latency to first edge.
Frequency programming occurs over a standard 2-wire (I²C-compatible) interface supporting both 100kHz and 400kHz modes; all register settings - including DAC, OFFSET, DIV, MUX, and ADDR - are stored nonvolatily in on-chip EEPROM, allowing standalone operation after power-up with factory- or user-defined defaults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency Range (OUT1) | 8.1kHz to 133MHz - supports low-frequency system clocks and high-speed digital interfaces without external dividers. |
| Output Frequency Range (OUT0) | 8.2MHz to 133MHz - provides stable reference clock for PLLs, ADCs, or microcontrollers with synchronous enable. |
| Master Oscillator Accuracy | ±0.75% absolute - ensures reliable timing across voltage and temperature without calibration. |
| Step Size | 10kHz - matches DS1085Z-10 variant; enables fine-grained frequency tuning within DAC span. |
| Supply Voltage | 4.75V to 5.25V - compatible with standard 5V logic rails; no level-shifting required for SDA/SCL. |
| Power-Down Current | 5mA typical - reduces system power during idle periods while retaining NV configuration. |
| Interface Protocol | 2-wire serial (I²C-compatible) - allows dynamic reconfiguration in live systems using existing MCU GPIOs. |
Pinout & Package
DS1085LZ-12B2+ is housed in a 150mil SOIC-8 package (8-pin surface-mount), pin-compatible with DS1085Z series variants and optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Main oscillator output | Programmable 8.1kHz–133MHz clock; driven by P1 prescaler and N divider; synchronous enable via CTRL1. |
| OUT0 | Reference oscillator output | Programmable 8.2MHz–133MHz clock; driven by P0 prescaler; synchronous enable via CTRL0. |
| VCC | Power supply | Single 5V supply input; powers internal oscillator, logic, and output drivers. |
| GND | Ground reference | Common return path for analog and digital circuitry; must be low-impedance for jitter control. |
| CTRL0 | Multifunction control input | Configurable as OUT0 enable, mux select, or device power-down (via PDN0 bit); OR'd with CTRL1 for global shutdown. |
| CTRL1 | Multifunction control input | Configurable as OUT1 enable or device power-down (via PDN1 bit); OR'd with CTRL0 for global shutdown. |
| SDA | 2-wire serial data I/O | Open-drain bidirectional line for register read/write; requires external pull-up; supports 100/400kHz modes. |
| SCL | 2-wire serial clock input | Input-only clock line synchronized to master; defines timing for SDA transitions and acknowledge cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous outputs | OUT0 and OUT1 share same master clock source but operate independently - eliminates inter-output skew in multi-clock domain systems. |
| Nonvolatile frequency storage | All DAC, OFFSET, DIV, and MUX settings retained in EEPROM - enables plug-and-play deployment without host initialization. |
| Glitch-free output enable | CTRL0/CTRL1 trigger synchronous edge-aligned enable - prevents metastability or false triggering in downstream logic. |
| No external timing components | Self-contained oscillator core - eliminates BOM cost, layout area, and tolerance sensitivity of crystals or RC networks. |
| Smart power-down mode | Global shutdown via either CTRL0 or CTRL1 (configurable OR logic) - reduces active current to 5mA while preserving register state. |
Applications
| Processor Clock Generation | Communications Timing Reference |
|---|---|
|
Use Scenario: Providing configurable CPU clock to an industrial microcontroller requiring multiple operating frequencies (e.g., low-power sleep vs. high-speed compute). IC Role / Device Role / Timing Role: Primary clock source with dynamically reprogrammable frequency via MCU's I²C bus. Use Value: Eliminates need for multiple fixed-frequency crystals or external PLLs; enables runtime clock scaling for power optimization. |
Use Scenario: Supplying stable reference clock to a UART, SPI controller, or Ethernet PHY in a networked sensor node. IC Role / Device Role / Timing Role: High-accuracy, low-jitter reference oscillator synchronized to system master clock. Use Value: Ensures deterministic baud rate timing and packet framing integrity across temperature and supply variations. |
| Test Equipment Signal Synthesis | Legacy System Clock Replacement |
|
Use Scenario: Generating precise test tones or sweep frequencies in automated bench instrumentation with firmware-controlled output changes. IC Role / Device Role / Timing Role: Programmable waveform timing engine delivering calibrated frequencies on demand. Use Value: Replaces discrete crystal oscillators + dividers; simplifies calibration and supports field-upgradable frequency tables. |
Use Scenario: Modernizing aging industrial PLCs where original crystal-based clock sources are obsolete or unavailable. IC Role / Device Role / Timing Role: Drop-in replacement oscillator with identical SOIC-8 footprint and 5V compatibility. Use Value: Restores timing functionality without PCB redesign; retains legacy timing behavior via factory-programmed NV settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1086LZ-10+ | Single-output variant (OUT1 only); identical 10kHz step size and EEPROM programming; lacks OUT0 reference output. | Used where only one programmable clock is needed; not suitable for dual-clock domain designs. | Select when reference clock is sourced elsewhere (e.g., external crystal or system clock tree). |
| Si5351A-B-GM | 3-output, 10MHz–200MHz I²C-programmable clock generator; ±25ppm initial accuracy; integrated PLLs; 3.3V supply. | Higher frequency range and output count; requires external 25MHz crystal; lower absolute accuracy than DS1085LZ-12B2+. | Choose for multi-output, higher-precision, or mixed-voltage systems - but adds BOM complexity and layout constraints. |
Compared with DS1085LZ-12B2+, DS1086LZ-10+ reduces cost and footprint for single-clock use cases, while Si5351A-B-GM offers greater flexibility at the expense of tighter supply requirements, external component dependency, and reduced absolute accuracy - making DS1085LZ-12B2+ optimal for robust, self-contained 5V dual-clock synthesis.
Availability
DS1085LZ-12B2+ is available at Aetrix Electronics and suitable for industrial automation controllers, communications interface modules, and embedded test instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for DS1085LZ-12B2+ 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, automotive, and communications applications.
The DS1085LZ-12B2+ belongs to the EconOscillator™ family - engineered for cost-sensitive, space-constrained systems needing factory-programmable or field-reconfigurable clock synthesis without external components.
FAQ
What is the default output frequency of DS1085LZ-12B2+ at power-up?
The DS1085LZ-12B2+ powers up with factory-programmed nonvolatile settings: default master oscillator frequency is 97.1MHz (matching DS1085Z-10 variant), P0 and P1 prescalers set to divide-by-1, and DIV1 = 0, resulting in OUT0 = 97.1MHz and OUT1 = 97.1MHz / N (where N = 2 by default, yielding 48.55MHz). These values are stored in EEPROM and require no host initialization.
Does DS1085LZ-12B2+ support 3.3V operation?
No, DS1085LZ-12B2+ is specified for 4.75V to 5.25V operation only. Its internal oscillator, output drivers, and 2-wire interface are designed for 5V logic levels; applying 3.3V will result in undefined behavior, failed communication, or failure to meet timing specifications. For 3.3V systems, consider level-shifting the SDA/SCL lines or selecting a 3.3V-compatible alternative like Si5351A.
Can DS1085LZ-12B2+ generate sub-10kHz frequencies?
No - the minimum programmable frequency for DS1085LZ-12B2+ is 8.1kHz on OUT1, achieved with maximum N = 1025 and P1 = ÷8 applied to the lowest master oscillator frequency (66MHz). Frequencies below 8.1kHz are outside specification and not supported by the internal divider architecture or AC characterization.
How is the 0.75% absolute accuracy of DS1085LZ-12B2+ maintained across temperature?
The 0.75% absolute accuracy of DS1085LZ-12B2+ includes initial tolerance, temperature drift (±0.5% over 0°C to +70°C), supply variation (±1.0%), and DAC nonlinearity (±0.4%). It is guaranteed over the full operating range without calibration - achieved through factory-trimmed DAC and oscillator compensation circuits embedded in the silicon, not via external feedback or software correction.
Is DS1085LZ-12B2+ pin-compatible with other DS1085Z variants?
Yes - DS1085LZ-12B2+ uses the same 150mil SOIC-8 package and identical pinout as DS1085Z-10, DS1085Z-25, and DS1085Z-50. All share identical VCC, GND, SDA, SCL, CTRL0, CTRL1, OUT0, and OUT1 assignments; only internal step size and default OFFSET differ, making them drop-in replacements for footprint and interface purposes.
DS1085LZ-12B2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- PLL:
- -
- Input:
- -
- Output:
- -
- Number of Circuits:
- -
- Ratio - Input:Output:
- -
- Differential - Input:Output:
- -
- Frequency - Max:
- -
- Divider/Multiplier:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
DS1085LZ-12B2+ FAQ
1.How can I place an order for DS1085LZ-12B2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1085LZ-12B2+ 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-12B2+ reliable?
The price and inventory of DS1085LZ-12B2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1085LZ-12B2+ is usually 5 days.
3.What payment methods are accepted for DS1085LZ-12B2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1085LZ-12B2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1085LZ-12B2+?
DS1085LZ-12B2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1085LZ-12B2+ 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-12B2+?
For technical support, including DS1085LZ-12B2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1085LZ-12B2+ requirements.
6.How does Aetrix verify that DS1085LZ-12B2+ is sourced from the original manufacturer or authorized distributors?
All DS1085LZ-12B2+ 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-12B2+ meets industry standards.
7.What is the process for return or replacement of DS1085LZ-12B2+?
All DS1085LZ-12B2+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1085LZ-12B2+, 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-12B2+ part is unused and in its original packaging.
Return procedure for DS1085LZ-12B2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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