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AD9060 Arkusz danych(PDF) 8 Page - Analog Devices |
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AD9060 Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 12 page REV. B AD9060 –8– VSENSE – V 62 0.4 56 50 44 38 32 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 10 9 8 7 6 5 Figure 3. SNR and ENOB vs. Reference Voltage Performance of the AD9060 has been optimized with an analog input voltage of ± 1.75 V (as measured at ± VSENSE). If the analog input range is reduced below these values, relatively larger dif- ferential nonlinearity errors may result because of comparator mismatches. As shown in Figure 3, performance of the converter is a function of ± VSENSE. Applying a voltage greater than 4 V across the internal resistor ladder will cause current densities to exceed rated values and may cause permanent damage to the AD9060. The design of the reference circuit should limit the voltage available to the references. Analog Input Signal The signal applied to AIN drives the inputs of 512 parallel com- parator cells (see Figure 5). This connection has a typical input resistance of 7 k Ω and input capacitance of 45 pF. The input capacitance is nearly constant over the analog input voltage range as shown in Figure 12, which illustrates that characteristic. * * AD9060 R/2 R R/2 R R/2 R R/2 R/2 R R R R/2 R/2 R R R/2 63 56 57 +VREF +VSENSE 3/4REF 1/2REF 1/4REF –VSENSE –VREF 1/2 AD708 1/2 AD708 –5V 150 +5V 150 0.1 F +1.75V 1/2 AD708 0.1 F 0.1 F +0.875V 1/2 AD708 0.1 F 0V 1/2 AD708 0.1 F –0.875V –1.75V 20k 20k AD580 150 2.5V = WIRING RESISTANCE = < 5 * R1 10k R2 10k R3 10k R4 10k RS RS RS RS 1.75V 356 RS RS Figure 4. Reference Circuit +VSENSE AIN 3/4REF 1/2REF 1/4REF –VSENSE Figure 5. Equivalent Analog Input |
Podobny numer części - AD9060_15 |
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Podobny opis - AD9060_15 |
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