**LTC6905IS5#TRMPBF: A 1kHz to 68MHz Resistor-Set SOT-23 Oscillator**

In the realm of precision timing, the **LTC6905IS5#TRMPBF** stands out as a highly versatile and compact solution for generating clock signals. This monolithic oscillator from Analog Devices integrates all critical components into a tiny SOT-23 package, offering engineers a powerful tool for applications demanding accurate frequency generation without the complexity of traditional crystal-based oscillators or large modules.

**Core Functionality and Key Features**

The essence of the LTC6905 is its elegant simplicity. Unlike oscillators with fixed frequencies, it generates a clock signal whose frequency is **precisely set by a single external resistor**, \( R_{SET} \). This resistor-programmable architecture provides exceptional flexibility, allowing the output frequency to be tuned from a low **1kHz up to a high 68MHz**. This wide range makes it suitable for a vast array of applications, from slow microcontroller clocks and data converters to high-speed communications and signal processing.

A key advantage of this device is its **low power consumption**, typically drawing just 1.2mA at 20MHz with a 5V supply, making it ideal for portable and battery-powered equipment. Furthermore, it boasts **excellent frequency stability**, with a tight ±0.5% initial accuracy and low drift over temperature. The output is a clean, 50% duty cycle square wave, available in either a CMOS or an open-drain configuration, providing interface flexibility with various logic families.

**Application Advantages and Usage**

The primary benefit of the LTC6905 is its ability to **replace multiple fixed-frequency oscillators** with a single component and a change of a resistor. This drastically simplifies inventory management, prototyping, and last-minute design changes. It is perfectly suited for:

* **Programmable Clock Generators**: Where system timing needs to be dynamically adjusted.

* **Data Conversion Systems**: Providing master clocks for ADCs and DACs.

* **Microcontroller and FPGA Clocking**: Offering a reliable, noise-resistant clock source.

* **Frequency Agile Systems**: In test equipment or radios where tunability is required.

Designing with the IC is straightforward. After selecting the desired frequency, the value for \( R_{SET} \) is calculated using the formula provided in the datasheet: \( F_{OSC} (MHz) = 2078 * 10^3 / R_{SET} (\Omega) \). A simple circuit with a bypass capacitor completes the design, enabling a robust and stable oscillator in a minimal footprint.

**ICGOODFIND**

The **LTC6905IS5#TRMPBF** is an exceptional find for designers seeking a combination of **miniaturization, flexibility, and performance**. Its resistor-set programmability across a vast frequency spectrum, housed in a minuscule SOT-23 package, offers an unparalleled solution for modern electronic designs where board space and component count are at a premium. It successfully bridges the gap between the inflexibility of standard oscillators and the complexity of larger PLL-based clock generators.

**Keywords:**

1. **Resistor-Set Oscillator**

2. **SOT-23 Package**

3. **Frequency Generation**

4. **Low Power Consumption**

5. **68MHz**