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ADR1581BRTZ-REEL7 Fiches technique(PDF) 9 Page - Analog Devices |
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ADR1581BRTZ-REEL7 Fiches technique(HTML) 9 Page - Analog Devices |
9 / 12 page ADR1581 Rev. 0 | Page 9 of 12 Output turn-on time is modified when an external noise-reduction filter is used. When present, the time constant of the filter dom- inates the overall settling. Attempts to drive a large capacitive load (in excess of 1000 pF) may result in ringing, as shown in the step response (see Figure 22). This is due to the additional poles formed by the load capacitance and the output impedance of the reference. A recommended method of driving capacitive loads of this magnitude is shown in 0V VIN 2.4V OUTPUT ERROR 1mV/DIV, 2µs/DIV OUTPUT 0.5mV/DIV, 2ms/DIV Figure 19. A resistor isolates the capacitive load from the output stage, whereas the capacitor provides a single-pole low-pass filter and lowers the output noise. 1.8V 2.0V VIN CL = 0.01µF 50µs/DIV 10mV/DIV Figure 20. Turn-On Settling TRANSIENT RESPONSE Many ADCs and DACs present transient current loads to the reference. Poor reference response can degrade the converter’s performance. Figure 22. Transient Response with Capacitive Load Figure 21 displays both the coarse and fine settling characteristics of the device to load transients of ±50 μA. PRECISION MICROPOWER LOW DROPOUT REFERENCE 1mV/DIV 20mV/DIV 1µs/DIV 1mV/DIV 20mV/DIV (a) (b) IR = 150µA – 50µA STEP IR = 150µA + 50µA STEP The circuit in Figure 23 provides an ideal solution for creating a stable voltage reference with low standby power consumption, low input/output dropout capability, and minimum noise output. The amplifier both buffers and optionally scales up the ADR1581 output voltage. Output voltages as high as 2.1 V can supply 1 mA of load current. A one-pole filter connected between the ADR1581 and the OP193 input can be used to achieve low output noise. The nominal quiescent power consumption is 250 μW. 3V 28.7kΩ ADR1581 OP193 VOUT = 1.250V OR VOUT = 1.250 (1 + R2/R3) R3 R2 4.7µF 205Ω Figure 21. Transient Settling Figure 21a shows the settling characteristics of the device for an increased reverse current of 50 μA. Figure 21b shows the response when the reverse current is decreased by 50 μA. The transients settle to 1 mV in about 3 μs. Figure 23. Micropower Buffered Reference |
Numéro de pièce similaire - ADR1581BRTZ-REEL7 |
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Description similaire - ADR1581BRTZ-REEL7 |
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