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LTC2298CUP 数据表(PDF) 18 Page - Linear Technology |
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LTC2298CUP 数据表(HTML) 18 Page - Linear Technology |
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18 / 28 page  LTC2298/LTC2297/LTC2296 18 229876f 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 229876 F06 LTC2298 LTC2297 LTC2296 Figure 5. Single-Ended Drive Figure 4. Differential Drive with an Amplifier 25Ω 25Ω 12pF 2.2µF VCM 229876 F04 – – + + CM ANALOG INPUT HIGH SPEED DIFFERENTIAL AMPLIFIER AIN + AIN – LTC2298 LTC2297 LTC2296 25Ω 0.1µF ANALOG INPUT VCM AIN + AIN – 10k 12pF 229876 F05 2.2µF 10k 25Ω 0.1µF LTC2298 LTC2297 LTC2296 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 229876 F07 LTC2298 LTC2297 LTC2296 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 229876 F08 6.8nH 6.8nH LTC2298 LTC2297 LTC2296 |
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