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LTC1407-1 Fiches technique(PDF) 13 Page - Linear Technology |
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LTC1407-1 Fiches technique(HTML) 13 Page - Linear Technology |
13 / 24 page 13 LTC1407-1/LTC1407A-1 14071f LT1818/LT1819: 400MHz, 2500V/ µs, 9mA, Single/Dual Voltage Mode Operational Amplifier. LT6200: 165MHz GBWP, –85dBc distortion at 1MHz, unity gain stable, rail-to-rail in and out, 15mA/amplifier, 0.95nV/ √Hz. LT6203: 100MHz GBWP, –80dBc distortion at 1MHz, unity gain stable, rail-to-rail in and out, 3mA/amplifier, 1.9nV/ √Hz. LT6600: Amplifier/Filter Differential In/Out with 10MHz Cutoff. INPUT FILTERING AND SOURCE IMPEDANCE The noise and the distortion of the input amplifier and other circuitry must be considered since they will add to the LTC1407-1/LTC1407A-1 noise and distortion. The small-signal bandwidth of the sample-and-hold circuit is 50MHz. Any noise or distortion products that are present at the analog inputs will be summed over this entire band- width. Noisy input circuitry should be filtered prior to the analog inputs to minimize noise. A simple 1-pole RC filter is sufficient for many applications. For example, Figure 1 shows a 47pF capacitor from CHO+ to ground and a 51 Ω source resistor to limit the net input bandwidth to 30MHz. The 47pF capacitor also acts as a charge reservoir for the input sample-and-hold and isolates the ADC input from sampling-glitch sensitive circuitry. High quality capaci- tors and resistors should be used since these components APPLICATIO S I FOR ATIO can add distortion. NPO and silvermica type dielectric capacitors have excellent linearity. Carbon surface mount resistors can generate distortion from self heating and from damage that may occur during soldering. Metal film surface mount resistors are much less susceptible to both problems. When high amplitude unwanted signals are close in frequency to the desired signal frequency a multiple pole filter is required. High external source resistance, combined with 13pF of input capacitance, will reduce the rated 50MHz input band- width and increase acquisition time beyond 39ns. INPUT RANGE The analog inputs of the LTC1407-1/LTC1407A-1 may be driven fully differentially with a single supply. Either input may swing up to 3V, provided the differential swing is no greater than 1.25V. In the valid input range, each input of each channel is always up to ±1.25V away from the other input of each channel. The –1.25V to 1.25V range is also ideally suited for AC-coupled signals in single supply applications. Figure 2 shows how to AC couple signals in a single supply system without needing a mid-supply 1.5V DC external reference. The DC common mode level is supplied by the previous stage that is already bounded by single supply voltage of the system. The common mode range of the inputs extends from ground to the supply voltage VDD. If the difference between the CH0+ and CH0– inputs or the CH1+ and CH1– inputs exceeds 1.25V, the output code will stay fixed at zero and all ones, and if this difference goes below –1.25V, the ouput code will stay fixed at one and all zeros. Figure 1. RC Input Filter LTC1407-1/ LTC1407A-1 CH0+ CH0– VREF GND 14071 F01 1 2 11 3 10 µF 47pF* 51 Ω* CH1+ CH1– 4 5 47pF* *TIGHT TOLERANCE REQUIRED TO AVOID APERTURE SKEW DEGRADATION 51 Ω* ANALOG INPUT ANALOG INPUT VCM 1.5V DC VCM 1.5V DC CHO+ 4.09V C4 10 µF 14071 F02 R2 1.6k C2 1 µF C1 1 µF C1, C2: FILM TYPE C3: COG TYPE C4: CERAMIC BYPASS R1 1.6k 1 2 3 LTC1407-1/ LTC1407A-1 CHO– VREF R3 51 Ω C3 56pF VIN Figure 2. AC Coupling of AC Signals with 1kHz Low Cut |
Numéro de pièce similaire - LTC1407-1 |
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Description similaire - LTC1407-1 |
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