LTC6904HMS8#TRPBF

Programmable Timers And Oscillators Overview

The LTC6904HMS8#TRPBF is a low-power, self-contained digital frequency source providing a precision square wave output from 1kHz to 68MHz. It operates on a single supply voltage ranging from 2.7V to 5.5V and requires no external components other than a power supply bypass capacitor. The device features an industry-standard I2C compatible serial interface for programming the output frequency via a 4-bit OCT code and a 10-bit DAC value. It includes an asynchronous Output Enable pin and offers typical initial frequency accuracy of 0.5% with a temperature drift of 10ppm/°C.

Programmable Timers And Oscillators Feature Summary

• I2C Compatible Serial Interface: Controlled via SDA and SCL lines with programmable slave address based on ADR pin state.
• Wide Frequency Range: Generates precise square waves from 1.039kHz to 68MHz using internal feedback loop linearization.
• Low Power Consumption: Typical supply current is 1.7mA at frequencies below 1MHz with a 2.7V supply.
• High Precision: Features 0.5% typical initial frequency accuracy and 10ppm/°C typical frequency drift over temperature.

Programmable Timers And Oscillators Applications

• Precision Digitally Controlled Oscillator
• Direct Digital Frequency Synthesis (DDS) Replacement
• Switched Capacitor Filter Clock Source
• Replacement for DAC and VCO in signal generation circuits

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging containing 2500 units. Confirm the H-grade designation ensures operation within the –40°C to 125°C extended temperature range. Ensure the host system supports standard I2C protocols and provides appropriate pull-up resistors for the SDA and SCL lines.

Programmable Timers And Oscillators Selection Notes

Select the LTC6904 variant when an I2C interface is required; use the LTC6903 for SPI compatibility. Choose the HMS8 package version for applications requiring operation up to 125°C. Ensure the design accommodates a maximum capacitive load of 5pF per output or utilizes buffering for higher loads to maintain frequency accuracy.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6903/LTC6904 family of programmable oscillators manufactured by Analog Devices. The MS8 package denotes an 8-lead Plastic MSOP form factor. The part is designed as a drop-in replacement for traditional crystal oscillators where programmability and wide frequency tuning are necessary.

Programmable Timers And Oscillators Replacement Considerations

Public confirmed substitute part numbers include LTC6903HMS8#TRPBF for SPI-based designs and LTC6904IMS8#TRPBF for commercial temperature range applications (-40°C to 85°C). Verify interface compatibility before substitution.

Programmable Timers And Oscillators FAQ

How is the slave address determined for the LTC6904?

The first six bits of the 7-bit address are factory programmed to 001011. The least significant bit is determined by the logic level on the ADR pin (Pin 4); pulling ADR low sets the address to 0010111, while pulling it high sets it to 0010110.

What is the default output frequency upon power-up?

Upon power-up, all register values reset to zero, resulting in a default output frequency of 1.039kHz with both CLK outputs active.

Can the LTC6904 drive large capacitive loads directly?

The device is designed to drive up to 5pF on each output without degradation in accuracy. For loads greater than 5pF or long trace lengths, a high-speed buffer is strongly suggested to maintain performance.