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AD5671R Datasheet(HTML) 29 Page - Analog Devices

Part No. AD5671R
Description  Base station power amplifiers
Download  32 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5671R Datasheet(HTML) 29 Page - Analog Devices

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Data Sheet
AD5671R/AD5675R
Rev. B | Page 29 of 32
THERMAL HYSTERESIS
Thermal hysteresis is the voltage difference induced on the
reference voltage by sweeping the temperature from ambient to
cold, to hot, and then back to ambient.
Thermal hysteresis data is shown in Figure 66. It is measured by
sweeping the temperature from ambient to −40°C, then to +125°C,
and returning to ambient. The VREF delta is then measured
between the two ambient measurements and shown in blue in
Figure 66. The same temperature sweep and measurements
were immediately repeated, and the results are shown in red in
Figure 66.
Figure 66. Thermal Hysteresis
Table 17. 24-Bit Input Shift Register Contents for Internal Reference and Amplifier Gain Setup Command1
DB23 (MSB)
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB1 to DB3
DB2
DB1
DB0 (LSB)
0
1
1
1
X
X
X
X
X
1/0
0
1/0
Command bits (C3 to C0)
Address bits (A3 to A0)
Don’t care
Amplifier
gain
Reserved
Reference setup
register
1
X means don’t care.
0
1
2
3
–130 –110
–90
–70
–50
–30
–10
10
30
50
70
DISTORTION (ppm)
FIRST TEMPERATURE SWEEP
SUBSEQUENT TEMPERATURE SWEEPS


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