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AD5320 Datasheet(PDF) 15 Page - Analog Devices |
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AD5320 Datasheet(HTML) 15 Page - Analog Devices |
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15 / 20 page  AD5320 Rev. C | Page 15 of 20 APPLICATIONS USING REF19X AS A POWER SUPPLY FOR AD5320 Because the supply current required by the AD5320 is extremely low, an alternative option is to use a REF19x voltage reference (REF195 for 5 V or REF193 for 3 V) to supply the required voltage to the part (see Figure 32). This is especially useful if the power supply is noisy or if the system supply voltages are at some value other than 5 V or 3 V (such as 15 V). The REF19x outputs a steady supply voltage for the AD5320. If the low dropout REF195 is used, the current it needs to supply to the AD5320 is 140 μA. This is with no load on the output of the DAC. When the DAC output is loaded, the REF195 also needs to supply the current to the load. The total current required (with a 5 kΩ load on the DAC output) is: 140 μA + (5 V/5 kΩ) = 1.14 mA The load regulation of the REF195 is typically 2 ppm/mA, which results in an error of 2.3 ppm (11.5 μV) for the 1.14 mA current drawn from it. This corresponds to a 0.009 LSB error. REF195 AD5320 DIN SCLK SYNC 15V 5V 140µA VOUT = 0V TO 5V 3-WIRE SERIAL INTERFACE Figure 32. REF195 as Power Supply to AD5320 BIPOLAR OPERATION USING THE AD5320 The AD5320 is designed for single-supply operation but a bipolar output range is also possible using the circuit in Figure 33. The circuit below gives an output voltage range of ±5 V. Rail-to-rail operation at the amplifier output is achievable using an AD820 or an OP295 as the output amplifier. The output voltage for any input code can be calculated as follows: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × = 1 2 1 2 1 4096 R R V R R R D V V DD DD O where D represents the input code in decimal (0 to 4095). With VDD = 5 V, R1 = R2 = 10 kΩ: V D V O 5 4096 10 − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × = This is an output voltage range of ±5 V with 000 hex corresponding to a −5 V output and FFF hex corresponding to a +5 V output. 3-WIRE SERIAL INTERFACE +5V AD5320 10µF 0.1µF VDD VOUT R1 = 10kΩ R2 = 10kΩ +5V ±5V –5V AD820/ OP295 Figure 33. Bipolar Operation with the AD5320 USING AD5320 WITH AN OPTO-ISOLATED INTERFACE For process control applications in industrial environments, it is often necessary to use an opto-isolated interface to protect and isolate the controlling circuitry from any hazardous common- mode voltages that can occur in the area where the DAC is functioning. Opto-isolators provide isolation in excess of 3 kV. Because the AD5320 uses a 3-wire serial logic interface, it requires only three opto-isolators to provide the required isolation (see Figure 34). The power supply to the part also needs to be isolated. This is done by using a transformer. On the DAC side of the transformer, a 5 V regulator provides the 5 V supply required for the AD5320. VDD 0.1µF VDD 10kΩ 10kΩ VDD 10kΩ 5V REGULATOR VOUT GND DIN SYNC SCLK POWER 10µF VDD SYNC SCLK DATA AD5320 Figure 34. AD5320 with An Opto-Isolated Interface |
Similar Part No. - AD5320_05 |
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Similar Description - AD5320_05 |
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