DS1086Z

Overview

The DS1086Z is a programmable clock generator from the EconOscillator family, manufactured by Analog Devices Inc./Maxim Integrated. It produces a spread-spectrum square-wave output with frequencies ranging from 260kHz to 133MHz. The device operates on a 5V supply and features selectable dithered outputs of 2% or 4% to reduce radiated emissions. Key electrical parameters include a maximum output frequency of 133MHz, a maximum input frequency of 400kHz for the serial interface, and an operating current of 35mA. It utilizes nonvolatile EEPROM memory to store settings, allowing standalone operation without external timing components.

Feature Summary

• User-programmable square-wave generator with frequencies from 260kHz to 133MHz
• Selectable 2% or 4% dithered output for EMI reduction
• Glitchless output-enable control and power-down mode
• 2-wire serial interface with nonvolatile EEPROM storage

Applications

• Printers
• Copiers
• PCs
• Computer Peripherals
• Cell Phones

Procurement Notes

Verify the specific package variant when ordering, as the DS1086Z denotes the SO-8 package version. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure that the application circuit includes appropriate decoupling capacitors (0.1µF and 0.01µF) as specified in the typical operating circuit diagram to maintain signal integrity and stable operation.

Selection Notes

Select the DS1086Z when a 5V supply voltage is required for the clock generation system. This component is suitable for applications needing spread-spectrum clocking to minimize electromagnetic interference. Consider the 8-pin SO package constraints regarding thermal dissipation and board space. Verify that the desired output frequency falls within the 260kHz to 133MHz range and that the 2-wire interface compatibility exists with the host microcontroller.

Part Context

The DS1086Z belongs to the DS1086 EconOscillator series, which also includes variants like the DS1086U (µSOP package) and the 3.3V versions such as the DS1086LU. These devices share similar functional characteristics but differ in supply voltage requirements and physical packaging. The Z suffix specifically identifies the standard SO-8 plastic small outline package variant within this product line.

Replacement Considerations

For pin-compatible replacements, consider other members of the DS1086 family such as the DS1086U if a µSOP package is acceptable. For 3.3V applications, the DS1086LU series may be relevant, though voltage differences must be addressed. No direct cross-model substitutes are confirmed in the provided documentation; verify electrical compatibility before substitution.

FAQ

How is the dither amount controlled in the DS1086Z?

The dither amount is controlled by the J0 bit in the PRESCALER register. Setting J0 high selects 2% peak dither, while setting it low selects 4% peak dither. The SPRD pin can also be used to enable or disable the dither function.

What is the default master oscillator frequency for the DS1086Z?

The default master oscillator frequency is 97.1 MHz. This value is stored in the factory-set registers and can be read from the RANGE register.

Can the DS1086Z operate without a microcontroller after initial programming?

Yes, all device settings are stored in nonvolatile (NV) EEPROM memory. Once programmed via the 2-wire serial interface, the DS1086Z can operate in stand-alone applications without continuous connection to a microcontroller.