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AD9066JR 데이터시트(PDF) 4 Page - Analog Devices |
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AD9066JR 데이터시트(HTML) 4 Page - Analog Devices |
4 / 7 page –4– MHz 5.8 1 5.7 5.6 5.5 5.4 5.3 5.2 10 100 ENCODE = 60MSPS Figure 1. ENOB vs. Analog Input Frequency MHz 5.8 5.7 5.6 5.5 5.4 5.3 5.2 10 100 ANALOG INPUT = 10.1MHz Figure 2. ENOB vs. Encode Rate USING THE AD9066 Analog Input and Voltage References The AD9066 is optimized to allow ac coupled inputs with a full- scale input range of 500 mV ± 5%. An LSB weight is approxi- mately 8 mV. The full-scale input range is defined as the voltage range that accommodates 2 n – 2 codes of equally weighted LSBs (between the first and last code transitions). For the AD9066 there are 32 codes above and below the midscale voltage of the A see Figure 3). The full-scale input range of the AD9066 is equal to 500/620 × (VT – VB), or nominally 500 mV. For dc coupled applications, the REF A and REF B voltages can be used to feed back offset compensation signals. This will allow the midscale transition voltage of the ADCs to track supply and temperature variations. In the event that offset correction signals are generated digitally, the REF pins would not be required. Figure 4a shows the equivalent circuit for the internal references. All component tolerances are ±25%. Gain Variation The full-scale input range is established by the current through the two matched resistor ladders (620 ohms each nominal). There- fore the gain of the ADC may be modified by forcing different voltages across the top and bottom voltage taps (VT and VB). The easiest way to increase the input range will be to force VB to a lower voltage. Using an external amplifier, the voltage at VB may be forced as low as 3.0 V (3.58 nominal). Using the pre- viously described relationship for full scale and the internal resistor ladder values, 3.0 V at VB will result in a nominal full- scale input range of 705 mV. A larger input range can be established by taking the VT voltage all the way to the supply voltage level while pulling VB to 3.0 V. This would force a 2 V potential across the ladder and create a full-scale input range of 1.6 V. Greater flexibility and improved power supply rejection can be achieved by forcing external voltage references at both the top and bottom of the resistor ladder. 111111 011111 100000 000001 000000 2n –2 = 62 –FULL-SCALE MIDSCALE +FULL-SCALE Figure 3. 310 310 310 310 400 40k 40k REF A REF B 2mA +VS = 5V VT VB VS 40k REF OUTPUTS VS VS INPUT 1.4V THRESHOLD Figure 4. Equivalent Circuits d. Analog Input c. Output Bits a. Reference Circuit b. Encode Input REV. A AD9066 |
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