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AD680AR Arkusz danych(PDF) 4 Page - Analog Devices |
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AD680AR Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 8 page AD680 REV. C –4– APPLYING THE AD680 The AD680 is simple to use in virtually all precision reference applications. When power is applied to +VIN and the GND pin is tied to ground, VOUT provides a +2.5 V output. The AD680 typically requires less than 250 µA of current when operating from a supply of +4.5 V to +36 V. To operate the AD680, the +VIN pin must be bypassed to the GND pin with a 0.1 µF capacitor tied as close to the AD680 as possible. Although the ground current for the AD680 is small (typically 195 µA), a direct connection should be made between the AD680 GND pin and the system ground plane. Reference outputs are frequently required to handle fast tran- sients caused by input switching networks, as are commonly found in ADCs and measurement instrumentation equipment. Many of the dynamic problems associated with this situation can be minimized with a few simple techniques. Using a series resistor between the reference output and the load will tend to “decouple” the reference output from the transient source. Or a relatively large capacitor connected from the reference output to ground can serve as a charge storage element to absorb and de- liver charge as is required by the dynamic load. A 50 nF capaci- tor is recommended for the AD680 in this case; this is large enough to store the required charge, but small enough so as not to disrupt the stability of the reference. The 8-pin plastic DIP and SOIC packaged versions of the AD680 also provide a temperature output pin. The voltage on this pin is nominally 596 mV at 25 °C. This pin will provide an output linearly proportional to temperature with a characteristic of 2 mV/ °C. NOISE PERFORMANCE The noise generated by the AD680 is typically less than 8 µV p-p over the 0.1 Hz to 10 Hz band. Figure 3 shows the 0.1 Hz to 10 Hz noise of a typical AD680. The noise measurement is made with a bandpass filter made of a 1-pole high-pass filter with a corner frequency at 0.1 Hz and a 2-pole low-pass filter with a corner frequency at 12.6 Hz to create a filter with a 9.922 Hz bandwidth. Figure 3. 0.1 Hz to 10 Hz Noise Noise in a 300 kHz bandwidth is approximately 800 µV p-p. Figure 4 shows the broadband noise of a typical AD680. Figure 4. Broadband Noise at 300 kHz TURN-ON TIME Upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error band is defined as the turn-on settling time. Two components normally associated with this are: the time for the active circuits to settle, and the time for the thermal gradients on the chip to stabilize. Figure 5 shows the turn-on settling time of the AD680 to be about 20 µs to 0.025% of its final value. Figure 5. Turn-On Settling Time The AD680 thermal settling characteristic benefits from its compact design. Once initial turn-on is achieved, the output lin- early approaches its final value; the output is typically within 0.01% of its final value after 25 ms. DYNAMIC PERFORMANCE The output stage of the ampliflier is designed to provide the AD680 with static and dynamic load regulation superior to less complete references. |
Podobny numer części - AD680AR |
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Podobny opis - AD680AR |
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