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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AD5323ARU-REEL7 Fiches technique(PDF) 21 Page - Analog Devices |
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AD5323ARU-REEL7 Fiches technique(HTML) 21 Page - Analog Devices |
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21 / 28 page  AD5303/AD5313/AD5323 Rev. B | Page 21 of 28 APPLICATIONS INFORMATION TYPICAL APPLICATION CIRCUIT The AD5303/AD5313/AD5323 can be used with a wide range of reference voltages, especially if the reference inputs are con- figured to be unbuffered, in which case the devices offer a full, one-quadrant multiplying capability over a reference range of 0 V to VDD. More typically, the AD5303/AD5313/AD5323 may be used with a fixed precision reference voltage. Figure 39 shows a typical setup for the AD5303/AD5313/AD5323 when using an external reference. If the reference inputs are unbuffered, the reference input range is from 0 V to VDD, but if the on-chip reference buffers are used, the reference range is reduced. Suit- able references for 5 V operation are the AD780 and REF192 (2.5 V references). For 2.5 V operation, a suitable external reference is the REF191, a 2.048 V reference. SCLK DIN GND AD5303/AD5313/ AD5323 SERIAL INTERFACE EXT REF AD780/REF192 WITH VDD = 5V OR REF191 WITH VDD = 2.5V VOUT SYNC VOUTA VOUTB VREFA VREFB 1µF VDD = 2.5V to 5.5V VDD BUF A BUF B Figure 39. AD5303/AD5313/AD5323 Using External Reference If an output range of 0 V to VDD is required when the reference inputs are configured as unbuffered (for example, 0 V to 5 V), the simplest solution is to connect the reference inputs to VDD. As this supply may not be very accurate and may be noisy, the AD5303/AD5313/AD5323 can be powered from the reference voltage, for example, using a 5 V reference such as the REF195, as shown in Figure 40. The REF195 outputs a steady supply voltage for the AD5303/AD5313/AD5323. The supply current required from the REF195 is 300 μA and approximately 30 μA or 60 μA into each of the reference inputs (if unbuffered). This is with no load on the DAC outputs. When the DAC outputs are loaded, the REF195 also needs to supply the current to the loads. The total current required (with a 10 kΩ load on each output) is 360 μA + 2(5 V/10 kΩ) = 1.36 mA The load regulation of the REF195 is typically 2 ppm/mA, which results in an error of 2.7 ppm (13.5 μV) for the 1.36 mA current drawn from it. This corresponds to a 0.0007 LSB error at eight bits and 0.011 LSB error at 12 bits. SCLK DIN AD5303/AD5313/ AD5323 SERIAL INTERFACE REF195 OUTPUT SYNC VOUTA VOUTB VDD VREFA 1µF 15V GND VS VREFB 0.1µF 10µF GND BUF A BUF B Figure 40. Using an REF195 as Power and Reference to the AD5303/AD5313/AD5323 BIPOLAR OPERATION USING THE AD5303/ AD5313/AD5323 The AD5303/AD5313/AD5323 have been designed for single- supply operation, but bipolar operation is also achievable using the circuit shown in Figure 41. The circuit shown has been con- figured to achieve an output voltage range of −5 V < VOUT < +5 V. Rail-to-rail operation at the amplifier output is achievable using an AD820 or OP295 as the output amplifier. SCLK DIN AD5303/AD5313/ AD5323 SERIAL INTERFACE REF195 SYNC VOUTA/B VREFA/B 1µF GND 6V to 16V 0.1µF 10µF VDD VDD = 5V +5V –5V R2 10kΩ AD820/ OP295 R1 10kΩ ±5V GND BUF A BUF B OUTPUT VS Figure 41. Bipolar Operation Using the AD5303/AD5313/AD5323 The output voltage for any input code can be calculated as follows: [ ]) / ( / ) ( ) 2 / ( ) ( R1 R2 V R1 R2 R1 D V V REF N REF OUT × − + × × = where: D is the decimal equivalent of the code loaded to the DAC. N is the DAC resolution. VREF is the reference voltage input, and gain bit = 0, with VREF = 5 V R1 = R2 = 10 kΩ and VDD = 5 V, V D V N OUT 5 ) 2 / 10 ( − × = |
Numéro de pièce similaire - AD5323ARU-REEL7 |
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Description similaire - AD5323ARU-REEL7 |
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