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AD1580BKSZ-REEL Arkusz danych(PDF) 7 Page - Analog Devices

Numer części AD1580BKSZ-REEL
Szczegółowy opis  1.2 V Micropower, Precision Shunt Voltage Reference
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD1580BKSZ-REEL Arkusz danych(HTML) 7 Page - Analog Devices

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AD1580
Rev. F | Page 7 of 12
1.2238
1.2248
1.2250
1.2252
1.2254
1.2256
1.2258
1.2244
1.2246
1.2240
1.2242
VMAX
VMIN
SLOPE = TC =
(VMAX – VO)
(+85°C – +25°C) × 1.225 × 10–6
SLOPE = TC =
(VMIN – VO)
(–40°C – +25°C) × 1.225 × 10–6
VO
–55
–35
–15
5
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 13. Output Voltage vs. Temperature
For example, the AD1580BRT initial tolerance is ±1 mV;
a ±50 ppm/°C temperature coefficient corresponds to an
error band of ±4 mV (50 × 10−6 × 1.225 V × 65°C). Thus, the
unit is guaranteed to be 1.225 V ± 5 mV over the operating
temperature range.
Duplication of these results requires a combination of high
accuracy and stable temperature control in a test system.
Evaluation of the AD1580 produces a curve similar to that
in Figure 5 and Figure 13.
VOLTAGE OUTPUT NONLINEARITY vs.
TEMPERATURE
When a reference is used with data converters, it is important to
understand how temperature drift affects the overall converter
performance. The nonlinearity of the reference output drift
represents an additional error that is not easily calibrated out of
the system. This characteristic (see Figure 14) is generated by
normalizing the measured drift characteristic to the end point
average drift. The residual drift error of approximately 500 ppm
shows that the AD1580 is compatible with systems that require
10-bit accurate temperature performance.
600
300
0
500
400
200
100
–55
–35
–15
5
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 14. Residual Drift Error
REVERSE VOLTAGE HYSTERESIS
A major requirement for high performance industrial
equipment manufacturers is a consistent output voltage at
nominal temperature following operation over the operating
temperature range. This characteristic is generated by measur-
ing the difference between the output voltage at +25°C after
operation at +85°C and the output, at +25°C after operation
at −40°C. Figure 15 displays the hysteresis associated with the
AD1580. This characteristic exists in all references and has been
minimized in the AD1580.
0
15
20
25
30
35
40
5
10
HYSTERESIS VOLTAGE (µV)
–400
–300
–200
–100
0
100
200
300
400
Figure 15. Reverse Voltage Hysteresis Distribution
OUTPUT IMPEDANCE vs. FREQUENCY
Understanding the effect of the reverse dynamic output imped-
ance in a practical application may be important to successfully
apply the AD1580. A voltage divider is formed by the AD1580
output impedance and the external source impedance. When
an external source resistor of about 30 kΩ (IR = 100 μA) is used,
1% of the noise from a 100 kHz switching power supply is devel-
oped at the output of the AD1580. Figure 16 shows how a 1 µF
load capacitor connected directly across the AD1580 reduces
the effect of power supply noise to less than 0.01%.
1k
10
0.1
1
100
FREQUENCY (Hz)
CL = 0
CL = 1µF
ΔIR = 0.1IR
IR = 100µA
IR = 1mA
10
100
1k
10k
100k
1M
Figure 16. Output Impedance vs. Frequency


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