Silicon Oscillator comes in 1 mm high ThinSOT(TM) package.
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Press Release Summary:
With frequency accuracy of ±0.5% typ, LTC6905 generates clock signals from 17-170 MHz using SOT-23 device and one resistor. Output frequency, determined by resistor, allows generation of any frequency value over entire range. As solid-state CMOS device, product has no internal mechanical resonating element. Silicon fabrication and assembly provide immunity to shock and vibration, while feedback loop linearizes relationship between set resistor and frequency.
Original Press Release:
Resistor-Set 170MHz Silicon Oscillator in ThinSOT(TM)
Milpitas, CA - November 10, 2004 - A new silicon oscillator from Linear Technology is the industry's fastest, providing a simple, compact and robust timing solution for FPGAs, CPLDs, microprocessors and DSPs. The LTC6905 resistor-set oscillator can generate clock signals from 17MHz to 170MHz using only this SOT-23 device and one resistor. The output frequency is determined by the resistor, allowing generation of any frequency value over the entire range.
The LTC6905 offers important advantages in high reliability applications. As a solid state CMOS device, it contains no internal mechanical resonating element. Standard silicon fabrication and assembly means that the LTC6905 is inherently immune to shock and vibration - a key advantage over crystals and ceramic resonators. Versions of the LTC6905 are available with guaranteed specifications over the commercial (0°C to 70°C), industrial (-40°C to 85°C) and automotive (-40°C to 125°C) temperature ranges.
"Purchasing is also simplified," according to Erik Soule, General Manger for the Signal Conditioning Business Unit. "With the LTC6905, you can stock a standard device and multiple resistor values. Crystal oscillators, especially those with less common frequency values, can be expensive and have long lead-times."
The low jitter LTC6905 provides a stable frequency source over time and temperature. Internally, a proprietary feedback loop linearizes the relationship between the set resistor and frequency, meaning no PLL is required to generate signals over the entire 17MHz to 170MHz span. As a result, clock jitter is only 50 picoseconds at 170MHz, with typical rise times of 500 picoseconds. In addition, temperature stability is competitive with most crystals at only ±20ppm/°C. The clock output starts up reliably and quickly (100 microseconds), yet the device draws only 6mA of supply current running at 100MHz.
All versions are in full production, with pricing starting at $1.65 each in 1,000-piece quantities.
Summary of Features: LTC6905
One External Resistor Sets the Frequency
Frequency Range: 17MHz to 170MHz
Frequency Accuracy ±0.5% Typ from 17MHz to 170MHz (0°C to 70°C, Over All Settings)
±20ppm/°C Temperature Stability
Fast Start-Up Time: 100µs Typical
Rise Time: 0.5ns, CL = 5pF
Timing Jitter: 50ps at 170MHz
50% ±2.5% Duty Cycle
6mA Typical Supply Current, fOSC = 100MHz
CMOS Output Drives 500Ohm Load (VS = 3V)
Operates from a Single 2.7V to 5.5V Supply
-40°C to 125°C Operating Temperature Range
Low Profile (1mm) ThinSOT(TM) Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
Note: LT and LTC are registered trademarks and ThinSOT is a trademark of Linear Technology Corp.
