DS1085LZ-5+

Overview

The DS1085LZ-5+ is a dual-output frequency synthesizer from Analog Devices/Maxim Integrated, featuring a 5kHz step size. It operates on a single 5V supply and generates a main oscillator output (OUT1) ranging from 8.1kHz to 133MHz and a reference oscillator output (OUT0) from 8.2MHz to 133MHz. The device includes an internal master oscillator (66MHz–133MHz), programmable prescalers, and dividers. Frequency settings are stored in nonvolatile EEPROM memory, allowing standalone operation without external timing components. Configuration is managed via a 2-wire serial interface.

Feature Summary

• Dual synchronous outputs with independent programming capabilities
• Nonvolatile EEPROM storage for default frequency settings on power-up
• 2-wire serial interface for dynamic in-circuit reprogramming
• Smart output enables ensuring glitch-free transitions

Applications

• Processor-controlled peripheral clock generation
• Standalone oscillator applications requiring fixed frequencies
• Systems needing dynamically adjustable clock sources

Procurement Notes

Verify the specific ordering suffix 'LZ' against official documentation to confirm package type and temperature range compliance. Ensure the 5kHz step size variant matches system resolution requirements. Confirm that the SOIC-8 package dimensions align with PCB layout constraints before finalizing procurement.

Selection Notes

Select the DS1085LZ-5+ when a 5kHz frequency resolution is required. Compare against Z-10 and Z-25 variants if different step sizes or DAC spans are needed. Verify that the 5V supply voltage and 0°C to +70°C operating temperature range suit the target environment. Check if the 2-wire serial interface speed supports the system's communication protocol.

Part Context

The DS1085 series belongs to the EconOscillator family of frequency synthesizers. This component integrates master oscillators, prescalers, and dividers into a single chip, eliminating the need for external crystals or resonators. It serves as a flexible clock source for digital systems requiring precise and programmable timing signals.

Replacement Considerations

Direct replacements include DS1085Z-10+ and DS1085Z-25+. These share identical pinouts and functionality but differ in frequency step size (10kHz and 25kHz respectively). Verify that the alternative step size meets the application's frequency accuracy requirements.