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LTC6255 Datasheet(PDF) 16 Page - Linear Technology |
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LTC6255 Datasheet(HTML) 16 Page - Linear Technology |
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16 / 28 page  LTC6258/LTC6259/LTC6260 16 6258960fa For more information www.linear.com/LTC6258 Figure 4b. Low Power Sine Generator Figure 4c. FFT Figure 4a. Low Power Squarewave - Sinewave Oscillator APPLICATIONS INFORMATION Low Power Sine Wave Generator Alowpowersinewavegeneratorcanbederivedbydrivinga squarewaveintothebandpassfilter.Acompleteschematic is shown in Figure 4a. The LTC6992-1 easily configures as a 50% duty cycle 10kHz square wave, and can drive the relatively benign loading seen in the bandpass filter. Figures4band4cshowtheLTC6992-1outputandbandpass filter output. THD of the sine wave is –30.5 dBc. Note, even harmonics that appear in the distortion products of the filtered output already appear in the source square wave. Low Noise Reference The LT6656 is a 1µA precision series voltage reference. Yet with low power comes low drive current capability and higher noise. The LTC6259 can be used as a buf- fer that follows a filter to enhance the utilization of the LT6656 in low power applications. Figure 5a shows such a configuration. First a very low cutoff frequency follows the LT6656 output (RIN1 and CIN1, lower than 5Hz cutoff). Choice of filter resistor RIN1 is such that the bias current in the LTC6259, multiplied by the resistance value, is lower than the nominal offset voltage of the op amp. CIN1 can be larger or smaller, with more or less filtering accord- ingly. The voltage withstanding requirement of CIN1 is low, resulting in large capacitance in a small volume. V+ V+ 4.7nF 4.7nF 21k 4.7nF 154k 182k 976k 0.1µF 154k 562 499k 6258 F04a 499k 1µF 10k 10k MOD LTC6992-1 GND SET OUT V+ DIV OUT 0.1µF LT6258 – + V+ 50µs/Div 0 1.0 2.0 3.0 4.0 5.0 6258 F04b FILTERED OUTPUT SQUARE WAVE FREQUENCY (kHz) 0 10 20 30 40 50 60 70 80 90 100 –120 –100 –80 –60 –40 –20 0 20 6258 F04c |
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