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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1809CS6 датащи(PDF) 18 Page - Linear Technology |
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LT1809CS6 датащи(HTML) 18 Page - Linear Technology |
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18 / 24 page  18 LT1809/LT1810 TYPICAL APPLICATIO S Driving A/D Converters The LT1809/LT1810 have a 27ns settling time to 0.1% of a 2V step signal and 20 Ω output impedance at 100MHz making it ideal for driving high speed A/D converters. With the rail-to-rail input and output and low supply voltage operation, the LT1809 is also desirable for single supply applications. As shown in Figure 2, the LT1809 drives a 10Msps, 12-bit ADC, the LTC1420. The lowpass filter, R3 and C1, reduces the noise and distortion products that might come from the input signal. High quality capacitors and resistors, an NPO chip capacitor and metal-film sur- face mount resistors, should be used since these compo- nents can add to distortion. The voltage glitch of the converter, due to its sampling nature, is buffered by the LT1809 and the ability of the amplifier to settle it quickly will affect the spurious-free dynamic range of the system. Figure 2 to Figure 7 depict the LT1809 driving the LTC1420 at different configurations and voltage supplies. The FFT responses show better than 90dB of SFDR for a ±5V supply, and 80dB on a 5V single supply for the 1.394MHz signal. – + LT1809 LTC1420 PGA GAIN = 1 REF = 2.048V 5V 5V 12 BITS 10Msps –5V –5V • • • R2 1k R1 1k VIN 1VP-P C1 470pF –AIN 1809 F02 +AIN R3 49.9 Ω Figure 2. Noninverting A/D Driver Figure 3. 4096 Point FFT Response FREQUENCY (MHz) 0 –120 –100 –80 –60 –40 –20 0 123 4 1809 F03 5 VS = ±5V AV = +2 fSAMPLE = 10Msps fIN = 1.394MHz SFDR = 90dB |
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