Linear Technology Corporation (LTC) has a family of interesting timing chips in SOT23 packages that let designers easily create five common timing functions:
- voltage-controlled oscillator
- low frequency oscillator
- pulse width modulated oscillator
- monostable pulse generator (one-shot)
- delay
Each of the five ICs require from one to three external programming resistors and might require a few other resistors and a capacitor, depending on the chip and function needed. Find a datasheet for the LTC6990 Voltage Controlled Silicon Oscillator at: cds.linear.com/docs/Datasheet/6990f.pdf.
Linear Technology offers a series of 12 "Demonstration Circuit 1562A" boards that lets engineers test and evaluate the LTC699X-X family of TimerBlox circuits. The board's center area has mounting pads for a circuit that will accommodate any of the five ICs because the devices use a common pinout with the exception one pin. That pin acts as an output enable, trigger input, reset input, modulation input, or pulse input. You can find the board circuits and part numbers in the "Demo Circuit 1562A Quick Start Guide at: cds.linear.com/docs/Reference%20Design/DC1562aqs.pdf.
As of August 9, 2010, LTC does not sell the demo circuits on its Web site and distributors Digi-Key and Newark don't recognize the board part numbers.
The demo circuits include two oscillators, four pulse-width modulators, four one-shot circuits, and two delay circuits. The board leaves space with etched pads so engineers can breadboard other circuit components. Power and ground traces encircle the TimerBlox circuit.
You can find more information on the TimerBlox page on the LTC site: /www.linear.com/TimerBlox . LTC also offers er a complete set of TimerBlox LTspice models. The LTspice design tool is a high performance Spice III simulator, schematic capture and waveform viewer, available for download from Linear Technology. In addition, the TimerBlox can be quickly set up using the TimerBlox Designer, an Excel-based set-up tool that generates a schematic, with part name and resistor values, and a timing diagram based on the timing function parameters. --Jon Titus
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