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AD680JR Datasheet(PDF) 6 Page - Analog Devices

Part # AD680JR
Description  Low Power, Low Cost 2.5 V Reference
Download  8 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD680JR Datasheet(HTML) 6 Page - Analog Devices

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AD680
REV. C
–6–
TEMPERATURE PERFORMANCE
The AD680 is designed for reference applications where tem-
perature performancc is important. Extensivc temperature test-
ing and characterization ensures that the device’s performance is
maintained over the specified temperature range.
Some confusion exists in thc area of defining and specifying ref-
erence voltage error over temperature. Historically, references
have been characterized using a maximum deviation per degree
centigrade, i.e., ppm/
°C. However, because of nonlinearities in
temperature characteristics which originated in standard Zener
references (such as “S” type characteristics), most manufactur-
ers now use a maximum limit error band approach to specify
devices. This technique involves the measurement of the output
at three or more different temperatures to specify an output
voltage error band.
SLOPE = TC
=
V
– V
MAX
MIN
–6
(T
– T
) x 2.5V x 10
MAX
MIN
2.501 – 2.498
85 C – (–40 C) x 2.5V x 10
=
–6
= 9.6ppm/ C
2.501
2.500
2.499
2.498
–50
–30
–10 0
20
40
60
80
100
TEMPERATURE – C
Figure 9. Typical AD680AN/AP Temperature Drift
Figure 9 shows a typical output voltage drift for the AD680AN/
AR and illustrates the test methodology. The box in Figure 9 is
bounded on the sides by the operating temperature extremes,
and on the top and bottom by the maximum and minimum out-
put voltages measured over the operating temperature range.
The maximum height of thc box for the appropriate tempera-
ture range and device grade is shown in Table I. Duplication of
these results requires a combination of high accuracy and stable
temperature control in a test system. Evaluation of the AD680
will produce a curve similar to that in Figure 9, but output read-
ings may vary depending upon the test equipment utilized.
TEMPERATURE OUTPUT PIN
The 8-pin packaged versions of the AD680 provide a tempera-
ture output pin on Pin 3 of each device. The output of Pin 3
(TEMP) is a voltage that varies linearly with temperature.
VTEMP at 25
°C is 596 mV, and the temperature coefficient is
2 mV/
°C. Figure 10 shows the output of this pin over
temperature.
The temperature pin has an output resistance of 12 k
Ω and is
capable of sinking or sourcing currents of up to 5
µA without
disturbing the reference output, enabling the temp pin to be
buffered by any of a number of inexpensive operational amplifi-
ers that have bias currents below this value.
760
440
90
520
480
–40
–50
600
560
640
680
720
80
60
50
40
20
10
0
–10
–20
–30
30
70
TEMPERATURE – C
Figure 10. Temp Pin Transfer Characteristic
DIFFERENTIAL TEMPERATURE TRANSDUCER
Figure 11 shows a differential temperature transducer that can
be used to measure temperature changes in the AD680’s envi-
ronment. This circuit operates from a +5 V supply. The tem-
perature dependent voltage from the TEMP pin of the AD680
is amplified by a factor of 5 to provide wider full-scale range and
more current sourcing capability. An exact gain of 5 can be
achieved by adjusting the trim potentiometer until the output
varies by 10 mV/
°C. To minimize resistance changes with tem-
perature, resistors with low temperature coefficients, such as
metal film resistors, should be used.
3
6
7
2
3
4
4
V
IN
TEMP
GND
AD680
+5V
+5V
R
B
R
F
R
BP
100
1.69k
1%
6.98k
1%
OP-90
2
0.1
µF
= 10mV/ C
OUT
∆V
∆T
Figure 11. Differential Temperature Transducer
LOW POWER, LOW VOLTAGE REFERENCE FOR DATA
CONVERTERS
The AD680 has a number of features that make it ideally suited
for use with A/D and D/A converters. The low supply voltage
required makes it possible to use the AD680 with today’s
convertcrs that run on 5 V supplies without having to add a
higher supply voltage for the reference. The low quiescent cur-
rent (195
µA), combined with the completeness and accuracy of
the AD680 make it ideal for low power applications such as
handheld, battery operated meters.


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