LTC6903HMS8#PBF

Programmable Timers And Oscillators Overview

The LTC6903HMS8#PBF is a low-power, self-contained digital frequency source manufactured by Analog Devices. It provides a precision square wave output ranging from 1kHz to 68MHz, programmable via an SPI-compatible serial interface. The device requires no external components other than a power supply bypass capacitor and operates on a single supply voltage between 2.7V and 5.5V. It features a proprietary feedback loop that linearizes the relationship between digital control settings and frequency, ensuring high accuracy with typical initial frequency accuracy of 0.5% and temperature drift of 10ppm/°C. The unit is housed in an 8-lead MSOP package.

Programmable Timers And Oscillators Feature Summary

• Frequency Range: 1kHz to 68MHz with 0.1% resolution
• Interface: SPI-compatible serial port (SDI, SCK, SEN)
• Accuracy: 0.5% typical initial accuracy; <1.1% total error over all settings
• Power Supply: Single 2.7V to 5.5V supply; typical current 1.7mA at f < 1MHz
• Temperature Grade: Industrial/H grade (-40°C to 125°C)

Programmable Timers And Oscillators Applications

• Precision digitally controlled oscillator systems
• Replacement for DAC and VCO combinations
• Clock generation for switched capacitor filters
• Direct Digital Frequency Synthesis (DDS) replacement

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix 'H' indicates the -40°C to 125°C operating temperature range. Confirm the '#PBF' designation ensures lead-free finish and RoHS compliance. Check the datasheet for absolute maximum ratings, specifically noting the total supply voltage limit of 6V and pin voltage limits relative to GND and V+. Ensure proper power supply bypassing with a 0.1µF capacitor close to the V+ pin to maintain specified performance.

Programmable Timers And Oscillators Selection Notes

Select the LTC6903 variant when an SPI-compatible interface is required; the LTC6904 uses I2C. The 'H' suffix is necessary for applications requiring operation up to 125°C. For frequencies above 1MHz, minimize capacitive loading on CLK pins to less than 5pF to avoid accuracy degradation. Unused outputs should be disabled via the CNF bits to reduce power dissipation and improve frequency stability.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6903/LTC6904 family of TimerBlox oscillators. The LTC6903 is distinguished by its SPI interface, whereas the LTC6904 utilizes I2C. The 'MS8' package refers to the 8-lead Plastic MSOP form factor. Other family members include the LTC6900 (lower power) and LTC6902 (multi-phase).

Programmable Timers And Oscillators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.