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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2293 датащи(PDF) 18 Page - Linear Technology |
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LTC2293 датащи(HTML) 18 Page - Linear Technology |
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18 / 28 page  LTC2293/LTC2292/LTC2291 18 229321f Figure 5 shows a single-ended input circuit. The imped- ance seen by the analog inputs should be matched. This circuit is not recommended if low distortion is required. APPLICATIO S I FOR ATIO Figure 6. Recommended Front End Circuit for Input Frequencies Between 70MHz and 170MHz Figure 8. Recommended Front End Circuit for Input Frequencies Above 300MHz Figure 7. Recommended Front End Circuit for Input Frequencies Between 170MHz and 300MHz 25Ω 25Ω 12Ω 12Ω 0.1µF AIN + AIN – 8pF 2.2µF VCM ANALOG INPUT 0.1µF 0.1µF T1 T1 = MA/COM, ETC 1-1-13 RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE 229321 F06 LTC2293 LTC2292 LTC2291 Figure 5. Single-Ended Drive Figure 4. Differential Drive with an Amplifier 25Ω 25Ω 12pF 2.2µF VCM 229321 F04 – – + + CM ANALOG INPUT HIGH SPEED DIFFERENTIAL AMPLIFIER AIN + AIN – LTC2293 LTC2292 LTC2291 25Ω 0.1µF ANALOG INPUT VCM AIN + AIN – 1k 12pF 229321 F05 2.2µF 1k 25Ω 0.1µF LTC2293 LTC2292 LTC2291 The 25Ω resistors and 12pF capacitor on the analog inputs serve two purposes: isolating the drive circuitry from the sample-and-hold charging glitches and limiting the wideband noise at the converter input. For input frequencies above 70MHz, the input circuits of Figure 6, 7 and 8 are recommended. The balun trans- former gives better high frequency response than a flux coupled center tapped transformer. The coupling capaci- tors allow the analog inputs to be DC biased at 1.5V. In Figure 8, the series inductors are impedance matching elements that maximize the ADC bandwidth. 25Ω 25Ω 0.1µF AIN + AIN – 2.2µF VCM ANALOG INPUT 0.1µF 0.1µF T1 T1 = MA/COM, ETC 1-1-13 RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE 229321 F07 LTC2293 LTC2292 LTC2291 25Ω 25Ω 0.1µF AIN + AIN – 2.2µF VCM ANALOG INPUT 0.1µF 0.1µF T1 T1 = MA/COM, ETC 1-1-13 RESISTORS, CAPACITORS, INDUCTORS ARE 0402 PACKAGE SIZE 229321 F08 6.8nH 6.8nH LTC2293 LTC2292 LTC2291 |
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