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ADR4520ARZ-R7 数据表(PDF) 33 Page - Analog Devices

部件名 ADR4520ARZ-R7
功能描述  Ultralow Noise, High Accuracy Voltage References
PDF  40 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADR4520ARZ-R7 数据表(HTML) 33 Page - Analog Devices

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Data Sheet
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
Rev. D | Page 33 of 40
TERMINOLOGY
Dropout Voltage (VDO)
Dropout voltage, sometimes referred to as supply voltage head-
room or supply output voltage differential, is defined as the
minimum voltage differential between the input and output such
that the output voltage is maintained to within 0.1% accuracy.
VDO = (VIN − VOUT)min|IL = constant
Because the dropout voltage depends on the current passing
through the device, it is always specified for a given load current.
In series mode devices, the dropout voltage typically increases
proportionally to the load current (see Figure 7, Figure 22,
Figure 41, Figure 54, Figure 69, and Figure 90).
Line Regulation
Line regulation refers to the change in output voltage in response
to a given change in input voltage and is expressed in percent
per volt, ppm per volt, or μV per volt change in input voltage.
This parameter accounts for the effects of self heating.
Load Regulation
Load regulation refers to the change in output voltage in response
to a given change in load current and is expressed in μV per mA,
ppm per mA, or ohms of dc output resistance. This parameter
accounts for the effects of self heating.
Solder Heat Resistance (SHR) Shift
SHR shift refers to the permanent shift in output voltage that is
induced by exposure to reflow soldering and is expressed as a
percentage of the output voltage. This shift is caused by changes
in the stress exhibited on the die by the package materials when
these materials are exposed to high temperatures. This effect is
more pronounced in lead-free soldering processes due to higher
reflow temperatures. SHR is calculated after three solder reflow
cycles to simulate the worst case conditions when assembling a
two-sided PCB with surface mount components with one addi-
tional rework cycle. The reflow cycles use the JEDEC standard
reflow temperature profile.
Temperature Coefficient (TCVOUT)
The temperature coefficient relates the change in the output
voltage to the change in the ambient temperature of the device, as
normalized by the output voltage at 25°C. The TCVOUT for the
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
A grade and B grade is fully tested over three temperatures:
−40°C, +25°C, and +125°C. The TCVOUT for the C grade and D
grade is fully tested over three temperatures: 0°C, +25°C, and
+70°C. This parameter is specified using two methods. The box
method is the most common method and accounts for the
temperature coefficient over the full temperature range,
whereas the bowtie method calculates the worst case slope from
+25°C and is therefore more useful for systems which are
calibrated at +25°C.
Box Method
The box method is represented by the following equation:
6
10
)
(
)
(
)}
,
,
(
{
)}
,
,
(
{
×
−
×
−
=
1
3
2
OUT
3
2
1
OUT
3
2
1
OUT
OUT
T
T
T
V
T
T
T
V
min
T
T
T
V
max
TCV
where:
TCVOUT is expressed in ppm/°C.
VOUT(TX) is the output voltage at Temperature TX.
T1 = −40°C.
T2 = +25°C.
T3 = +125°C.
This box method ensures that TCVOUT accurately portrays the
maximum difference between any of the three temperatures at
which the output voltage of the device is measured.
Bowtie Method
The bowtie method is represented by the following equation:
TCVOUT = |max{TCVOUT1, TCVOUT2}|
where:
6
2
3
3
2
3
2
2
6
2
1
10
)
(
)
(
)}
,
(
{
)}
,
(
{
10
)
(
)
(
)}
,
(
{
)}
,
(
{
×
−
×
−
=
×
−
×
−
=
T
T
T
V
T
T
V
min
T
T
V
max
TCV
T
T
T
V
T
T
V
min
T
T
V
max
TCV
2
OUT
OUT
OUT
OUT
1
2
OUT
2
1
OUT
2
1
OUT
OUT
TCVOUT is expressed in ppm/°C.
VOUT(TX) is the output voltage at Temperature TX.
T1 = 0°C.
T2 = +25°C.
T3 = +70°C.
Thermally Induced Output Voltage Hysteresis (ΔVOUT_HYS)
Thermally induced output voltage hysteresis represents the
change in the output voltage after the device is exposed to a
specified temperature cycle. This is expressed as a difference in
ppm from the nominal output.
6
_
10 [ppm]
OUT1_25°C
OUT2_25°C
OUT HYS
OUT_25°C
VV
V
V
−
∆=
×
where:
VOUT1_25°C is the output voltage at 25°C.
VOUT2_25°C is the output voltage after temperature cycling.
Long-Term Stability (ΔVOUT_LTD)
Long-term stability refers to the shift in the output voltage versus
time. This is expressed as a difference in ppm from the nominal
output.
6
_
10
)
(
)
(
)
(
×
−
=
∆
0
OUT
0
OUT
1
OUT
LTD
OUT
t
V
t
V
t
V
V
[ppm]
where:
VOUT(t0) is the VOUT at the starting time of the measurement.
VOUT(t1) is the VOUT at the end time of the measurement.



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