LTC6904IMS8#TRPBF

Programmable Timers And Oscillators Overview

The LTC6904IMS8#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, configured via an industry-standard I2C 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. 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 low jitter characteristics.

Programmable Timers And Oscillators Feature Summary

• I2C Compatible Interface: Controlled via standard I2C protocol using ADR, SCK, and SDI pins for easy microcontroller integration.
• Wide Frequency Range: Generates precise square waves from 1kHz to 68MHz with 0.1% resolution.
• High Accuracy: Offers ±0.5% typical initial frequency accuracy and <1.1% total frequency error over all settings.
• Low Power Consumption: Typical supply current is 1.7mA at frequencies below 1MHz with a 2.7V supply.

Programmable Timers And Oscillators Applications

• Precision Digitally Controlled Oscillator
• Power Management Systems
• Direct Digital Frequency Synthesis (DDS) Replacement
• Switched Capacitor Filter Clock

Programmable Timers And Oscillators Procurement Notes

Verify the IMS8 suffix indicates the industrial temperature range (-40°C to 85°C). Confirm the #TRPBF suffix denotes Tape and Reel packaging and Lead-Free finish. Ensure the host system supports I2C communication protocols and provides appropriate pull-up resistors for the SDA and SCL lines.

Programmable Timers And Oscillators Selection Notes

Select the LTC6904 over the LTC6903 when an I2C interface is required instead of SPI. Consider the IMS8 variant for industrial temperature applications (-40°C to 85°C); use CMS8 for commercial (0°C to 70°C) or HMS8/MPMS8 for extended ranges. Ensure the load capacitance does not exceed 5pF to maintain specified accuracy without requiring additional buffering.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6903/LTC6904 family of silicon oscillators. While the LTC6903 uses an SPI-compatible interface, the LTC6904 utilizes an I2C interface. Both share identical electrical performance, frequency ranges, and package options, differing primarily in their serial communication protocol.

Programmable Timers And Oscillators Replacement Considerations

LTC6903IMS8#TRPBF serves as a functional substitute if the application can accommodate an SPI interface instead of I2C. For lower frequency needs up to 20MHz, the LTC6900 series offers lower power consumption but lacks the wideband capability of the LTC6904.

Programmable Timers And Oscillators FAQ

How is the slave address determined for the LTC6904?

The LTC6904 has a factory-programmed 6-bit address (001011). The 7th bit is determined by the state of the ADR pin (Pin 4). If ADR is LOW, the address is 0010111; if HIGH, it is 0010110.

What is the impact of capacitive loading on output accuracy?

The device is designed to drive up to 5pF on each output without degradation. Loading exceeding 5pF may degrade frequency accuracy, particularly above 1MHz, and typically requires a buffer amplifier.

How does the device handle power-up states?

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