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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC6905CS5 датащи(PDF) 8 Page - Linear Technology |
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LTC6905CS5 датащи(HTML) 8 Page - Linear Technology |
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8 / 8 page  LTC6905 8 6905fa Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2005 LT/TP 0205 1K REV A • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1799 1kHz to 33MHz ThinSOT Oscillator Single Output, High Frequency Operation LTC6900 1kHz to 20MHz ThinSOT Oscillator Single Output Lower Power LTC6902 Multiphase Oscillator with Spread Spectrum Modulation 2-, 3- or 4-Phase Outputs LTC6903/LTC6904 1kHz to 68MHz Serial Port Programmable Oscillator 3-Wire or I2C TM Programmable LTC6905-XXX Series Fixed Frequency LTC6905 High Accuracy, No External Resistor LTC6906 Micropower, 10kHz to 1MHz Resistor Set ThinSOT Oscillator Ultralow Power, Resistor Sets Frequency I2C is a trademark of Philips Electronics N.V. APPLICATIO S I FOR ATIO Figure 3. Current Controlled Oscillator Figure 4. Voltage Controlled Oscillator f N MHz k VV R I VV MHz OSC SET SET CNTRL SET = Ω ⎡ ⎣ ⎢ ⎤ ⎦ ⎥ + ⎡ ⎣ ⎢ ⎢ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ ⎥ ⎥ + + 1 168 5 10 15 .• • – – – . ICNTRL Frequency ≤ 100kHz Example (Figure 3): VSET = (V+ – 1V), RSET = 10k, N = 1 f MHz k I MHz OSC CNTRL = Ω () + [] 168 5 1 10 1 5 .• – • . f N MHz k VV R VV R VV MHz OSC SET SET SET CNTRL CNTRL SET = Ω ⎡ ⎣ ⎢ ⎤ ⎦ ⎥ + ⎡ ⎣ ⎢ ⎢ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ ⎥ ⎥ + + 1 168 5 10 15 .• • – – – – . VCNTRL Frequency ≤ 100kHz Example (Figure 4): VSET = (V+ – 1V), RSET = 10k, RCNTRL = 33.2k, N = 1, V+ = 3V f MHz k k VV k MHz OSC CNTRL = Ω ΩΩ ⎡ ⎣ ⎢ ⎤ ⎦ ⎥ + ⎡ ⎣ ⎢ ⎤ ⎦ ⎥ 168 5 10 1 10 2 33 2 15 .• • – – . . ALTERNATIVE METHODS OF SETTING THE OUTPUT FREQUENCY OF THE LTC6905 The LTC6905 may be programmed by any method that sources a current into the SET pin (Pin 3). The accuracy of the programming is best with a simple resistor because the LTC6905 takes into account both the voltage at the SET pin and the current into the SET pin when generating the output frequency. Since the voltage at the SET pin can vary by as much as 5%, setting the frequency using a current rather than a resistor will result in as much as 5% addi- tional inaccuracy in the output frequency. Figure 3 shows a method to control the frequency of the LTC6905 using a current source. RSET, in this case, sets a maximum frequency according to the regular expression for fOSC. The current source will subtract current from the SET pin to lower the frequency. Figure 4 shows a method for controlling the frequency of the LTC6905 using a voltage source. In this case, RSET sets a constant current into the SET pin, and RCNTRL will sub- tract from this current in order to change the frequency. Increasing VCNTRL will increase the output frequency. V+ 1 2 3 5 fOSC 69.8MHz TO 170MHz V+ 0.1µF ICNTRL 0µA TO 60µA RSET 10k 6905 F03 4 GND V+ N = 1 LTC6905 SET OUT DIV V+ 1 2 3 5 V+ = 3V 0.1µF RSET 10k VCNTRL 0V TO 2V 6905 F04 4 GND V+ N = 1 LTC6905 SET OUT DIV + – RCNTRL 33.2k fOSC 69.8MHz TO 170MHz |
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