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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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AD5340BRU-REEL Fiches technique(PDF) 21 Page - Analog Devices |
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AD5340BRU-REEL Fiches technique(HTML) 21 Page - Analog Devices |
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21 / 28 page  AD5330/AD5331/AD5340/AD5341 Rev. A | Page 21 of 28 APPLICATIONS INFORMATION TYPICAL APPLICATION CIRCUITS The AD5330/AD5331/AD5340/AD5341 can be used with a wide range of reference voltages, especially if the reference inputs are configured to be unbuffered, in which case the devices offer full, one-quadrant multiplying capability over a reference range of 0.25 V to VDD. More typically, these devices can be used with a fixed, precision reference voltage. Figure 43 shows a typical setup for the devices when using an external reference connected to the unbuffered reference inputs. If the reference inputs are unbuffered, the reference input range is from 0.25 V to VDD, but if the on-chip reference buffers are used, the reference range is reduced. Suitable references for 5 V operation are the AD780 and REF192. For 2.5 V operation, a suitable external reference is the AD589, a 1.23 V band gap reference. AD5330/AD5331/ AD5340/AD5341 VOUT VDD = 2.5V TO 5.5V VDD GND VREF GND EXT REF + 0.1µF 10µF VOUT VIN AD780/REF192 WITH VDD = 5V OR AD589 WITH VDD = 2.5V Figure 43. AD5330/AD5331/AD5340/AD5341 Using External Reference DRIVING VDD FROM THE REFERENCE VOLTAGE If an output range of 0 V to VDD is required, the simplest solution is to connect the reference inputs to VDD. Because this supply may not be very accurate and may be noisy, the devices can be powered from the reference voltage, for example using a 5 V reference such as the ADP667, as shown in Figure 44. AD5330/AD5331/ AD5340/AD5341 GND SHDN VOUT ADP667 VSET 6V TO 16V VOUT VDD VIN GND VREF + 0.1µF 0.1µF 10µF Figure 44. Using an ADP667 as Power and Reference to AD5330/AD5331/AD5340/AD5341 BIPOLAR OPERATION USING THE AD5330/AD5331/ AD5340/AD5341 The AD5330/AD5331/AD5340/AD5341 are designed for single-supply operation, but bipolar operation is achievable using the circuit shown in Figure 45. The circuit shown has been configured to achieve an output voltage range of –5 V < VO < +5 V. Rail-to-rail operation at the amplifier output is achievable using an AD820 or OP295 as the output amplifier. The output voltage for any input code can be calculated as follows: VO = [(1 + R4/R3) × (R2/(R1 + R2) × (2 × VREF × D/2N)] – R4 × VREF/R3 where: D is the decimal equivalent of the code loaded to the DAC. N is the DAC resolution. VREF is the reference voltage input. with: VREF = 2.5 V. R1 = R3 = 10 kΩ. R2 = R4 = 20 kΩ and VDD = 5 V. VO = (10 × D/2N) − 5. VDD = 5V + 0.1µF 10µF R2 20kΩ R1 10kΩ R3 10kΩ R4 20kΩ GND VO = ±5V +5V –5V AD5330/AD5331/ AD5340/AD5341 VREF VOUT VDD GND EXT REF VOUT VIN AD780/REF192 WITH VDD = 5V OR AD589 WITH VDD = 2.5V 0.1µF Figure 45. Bipolar Operation using the AD5330/AD5331/AD5340/AD5341 DECODING MULTIPLE AD5330/AD5331/ AD5340/AD5341 The CS pin on these devices can be used in applications to decode a number of DACs. In this application, all DACs in the system receive the same data and WR pulses, but only CS to one of the DACs is active at any one time, so data is only written to the DAC whose CS is low. If multiple AD5341s are being used, a common HBEN line is also required to determine if the data is written to the high byte or low byte register of the selected DAC. The 74HC139 is used as a 2-line to 4-line decoder to address any of the DACs in the system. To prevent timing errors, the enable input should be brought to its inactive state while the coded address inputs are changing state. Figure 46 shows a diagram of a typical setup for decoding multiple devices in a system. Once data has been written sequentially to all DACs in |
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Description similaire - AD5340BRU-REEL |
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