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AD680AR Arkusz danych(PDF) 4 Page - Analog Devices

Numer części AD680AR
Szczegółowy opis  Low Power, Low Cost 2.5 V Reference
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD680AR Arkusz danych(HTML) 4 Page - Analog Devices

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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.


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