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AD5601 Datasheet(PDF) 16 Page - Analog Devices |
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AD5601 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 20 page  AD5601/AD5611/AD5621 Preliminary Technical Data Rev. PrC | Page 16 of 20 APPLICATIONS CHOOSING A REFERENCE AS POWER SUPPLY FOR AD5601/AD5611/AD5621 The AD5601/AD5611/AD5621 come in a tiny SC70 package with less than 100 µA supply current. Because of this, the choice of reference depends on the application requirement. For space- saving applications, the ADR425 is available in an SC70 package and has excellent drift at 3 ppm/°C. It also provides very good noise performance at 3.4 µV p-p in the 0.1 Hz to 10 Hz range. Because the supply current required by the AD5601/AD5611/ AD5621 is extremely low, the parts are ideal for low supply applications. The ADR293 voltage reference is recommended in this case. This requires 15 µA of quiescent current and can, therefore, drive multiple DACs in one system, if required. 3-WIRE SERIAL INTERFACE SYNC SCLK DIN 7V 5V VOUT = 0V TO 5V ADR425 AD5601/AD5611/ AD5621 Figure 34. ADR425 as Power Supply to the AD5601/AD5611/AD5621 Some recommended precision references for use as supplies to the AD5601/AD5611/AD5621 are listed in Table 7. Table 7. Precision References for Use with AD5601/AD5611/ AD5621 Part No. Initial Accuracy (mV max) Temperature Drift (ppm/°C max) 0.1 Hz to 10 Hz Noise (µV p-p typ) ADR435 ±6 3 3.4 ADR425 ±6 3 3.4 ADR02 ±5 3 15 ADR395 ±6 25 5 BIPOLAR OPERATION USING THE AD5601/ AD5611/AD5621 The AD5601/AD5611/AD5621 have been designed for single- supply operation, but a bipolar output range is also possible using the circuit in Figure 35. The circuit in Figure 35 gives an output voltage range of ±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: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × = R1 R2 V R1 R2 R1 D V V DD N DD O 2 where D represents the input code in decimal (0–2N). With VDD = 5 V, R1 = R2 = 10 kΩ: V 5 2 10 − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × = N O D V This is an output voltage range of ±5 V with 0x0000 corre- sponding to a –5 V output, and 0x3FFF corresponding to a +5 V output. R2 = 10k Ω +5V –5V AD820/ OP295 3-WIRE SERIAL INTERFACE +5V AD5601/AD5611/ AD5621 10 µF 0.1 µF V DD V OUT R1 = 10k Ω 5V Figure 35. Bipolar Operation with the AD5601/AD5611/AD5621 |
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