LTC6903IMS8#TRPBF

Programmable Timers And Oscillators Overview

The LTC6903IMS8#TRPBF is a low-power, self-contained digital frequency source manufactured by Analog Devices Inc. It provides a precision square wave output ranging from 1kHz to 68MHz, programmable via an SPI-compatible serial interface. The device operates on a single supply voltage between 2.7V and 5.5V and requires no external components other than a power supply bypass capacitor. Key electrical specifications include a typical initial frequency accuracy of 0.5%, a total frequency error of less than 1.1% across all settings, and a typical frequency drift of 10ppm/°C over temperature. The part is housed in an 8-lead plastic MSOP package.

Programmable Timers And Oscillators Feature Summary

• SPI-compatible serial interface for digital frequency control
• Frequency range of 1kHz to 68MHz with 0.1% resolution
• Typical supply current of 1.7mA at frequencies below 1MHz
• Jitter specification of less than 0.4% typical from 1kHz to 8MHz

Programmable Timers And Oscillators Applications

• Precision digitally controlled oscillator circuits
• Power management systems requiring precise timing
• Direct Digital Frequency Synthesis (DDS) replacement for DACs and VCOs
• Clock generation for switched capacitor filters

Programmable Timers And Oscillators Procurement Notes

Verify the IMS8 suffix indicates the industrial temperature grade (-40°C to 85°C). Confirm the #TRPBF suffix denotes tape and reel packaging and lead-free finish. Ensure the design supports SPI signaling levels compatible with the host microcontroller.

Programmable Timers And Oscillators Selection Notes

Select this model when an SPI interface is preferred over I2C; the LTC6904 variant uses I2C. Choose the IMS8 grade for industrial temperature applications (-40°C to 85°C); use CMS8 for commercial grades or HMS8 for extended ranges. Ensure the load capacitance does not exceed 5pF without buffering to maintain accuracy.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6903/LTC6904 family of serial port programmable oscillators. The IMS8 designation specifies the industrial temperature range and MSOP package. The TRPBF suffix indicates the unit is supplied in a tape and reel format suitable for automated surface-mount assembly.

Programmable Timers And Oscillators Replacement Considerations

LTC6903IMS8#PBF: Identical function and temperature grade, but supplied in tube packaging instead of tape and reel.

Programmable Timers And Oscillators FAQ

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.

How is the output frequency calculated?

The frequency is determined by the equation f = 2078 * (DAC / 2^(10+OCT)), where DAC is a 10-bit code and OCT is a 4-bit octave setting.

What are the maximum capacitive loading limits?

The device is designed to drive up to 5pF on each output pin without degradation in accuracy. Higher loads require a buffer.