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AD5346 Datasheet(PDF) 19 Page - Analog Devices |
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AD5346 Datasheet(HTML) 19 Page - Analog Devices |
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19 / 24 page  AD5346/AD5347/AD5348 Rev. 0 | Page 19 of 24 APPLICATIONS INFORMATION TYPICAL APPLICATION CIRCUITS The AD5346/AD5347/AD5348 can be used with a wide range of reference voltages, especially if the reference inputs are configured as 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 may be used with a fixed, precision reference voltage. Figure 41 shows a typical setup for the devices when using an external reference connected to the reference inputs. Suitable references for 5 V operation are the AD780, ADR381, and REF192 (2.5 V refer- ences). For 2.5 V operation, suitable external references are the AD589 and the AD1580 (1.2 V band gap references). AD5346/AD5347/ AD5348 VOUT* 0.1 µF VDD = 2.5V to 5.5V VDD GND AD780/ADR381/REF192 WITH VDD = 5V OR AD589/AD1580 WITH VDD = 2.5V VREF* GND *ONLY ONE CHANNEL OF VREF AND VOUT SHOWN 10 µF VOUT VIN EXT REF Figure 41. AD5346/AD5347/AD5348 Using an 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, by using a 5 V reference such as the ADM663 or ADM666, as shown in Figure 42. AD5346/AD5347/ AD5348 VOUT* 0.1 µF 6V TO 16V VDD GND VREF* GND *ONLY ONE CHANNEL OF VREF AND VOUT SHOWN 10 µF VOUT(2) VIN EXT REF 0.1 µF GND SENSE SHDN VSET ADM663/ADM666 Figure 42. Using an ADM663/ADM666 as Power and Reference to the AD5346/AD5347/AD5348 BIPOLAR OPERATION USING THE AD5346/AD5347/AD5348 The AD5346/AD5347/AD5348 have been designed for single- supply operation, but a bipolar output range is also possible by using the circuit shown in Figure 43. This circuit has an output voltage range of ±5 V. Rail-to-rail operation at the amplifier output is achievable using an AD820, an AD8519, or an OP196 as the output amplifier. 5V EXT REF GND VOUT R2 20k Ω R1 10k Ω R4 20k Ω R3 10k Ω ±5V +5V –5V *ONLY ONE CHANNEL OF VREF AND VOUT SHOWN 0.1 µF 0.1 µF 10 µF AD820/AD8519/ OP196 VIN GND AD5346/AD5347/ AD5348 VOUT* VDD VREF* Figure 43. Bipolar Operation with the AD5346/ AD5347/AD5348 The output voltage for any input code can be calculated as follows: VOUT = [(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 = 5 V R1 = R3 = 10 kΩ R2 = R4 = 20 kΩ VDD = 5 V GAIN = 2 VOUT = (10 × D/2N) – 5 |
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