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| 型號： | ADL5519-EVALZ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1 MHz to 10 GHz, 50 dB Dual Log Detector/Controller |
| 中文描述： | 1兆赫至10 GHz，50分貝雙數(shù)檢波器/控制器 |
| 文件頁數(shù)： | 20/27頁 |
| 文件大?。?/td> | 479K |
| 代理商： | ADL5519-EVALZ |
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Preliminary Technical Data
ADL5519
TEMPERATURE COMPENSATION ADJUSTMENT
The ADL5519 has a highly stable measurement output with
respect to temperature. However, when the RF inputs exceed a
frequency of 600 MHz, the output temperature drift must be
compensated for using ADJ[A, B] for optimal performance.
Proprietary techniques are used to compensate for the temper-
ature drift. The absolute value of compensation varies with
frequency and circuit board material. Table 4 shows
recommended voltages for ADJ[A, B] to maintain a
temperature drift error of typically ±0.5 dB or better over the
entire rated temperature range with the recommended baluns.
Table 4: Recommended ADJ[A,B] Voltage Levels
Frequency
Recommended ADJ[A,B] Voltage
50 MHz
TBD
100 MHz
TBD
900 MHz
TBD
1.8 GHz
TBD
1.9 GHz
TBD
2.2 GHz
TBD
3.6 GHz
TBD
5.3 GHZ
TBD
5.8 GHz
TBD
8 GHz
TBD
Rev. PrB | Page 20 of 27
Compensating the device for temperature drift using ADJ[A, B]
allows for great flexibility. If the user requires minimum temper-
ature drift at a given input power or subset of the dynamic range,
the ADJ[A, B] voltage can be swept while monitoring OUT[A, B]
over temperature. Figure 22 shows the result of such an exercise.
The value of ADJ[A, B] where the output has minimum
movement (approximately 0.77 V for the example in Figure 22)
is the recommended voltage for ADJ[A, B] to achieve minimum
temperature drift at a given power and frequency.
Figure 22. OUTA vs. ADJA over Temp. Pin = 30 dBm, 1.9 GHz
The ADJ[A, B] input has high input impedance. The input can
be conveniently driven from an attenuated value of VREF using
a resistor divider, if desired.
Figure 23 shows a simplified schematic representation of the
ADJ[A, B] interface.
COMR
COMR
I
COMP
ADJ[A,B]
V
TADJ
VREF
ADL5519
Figure 23. ADJ[A, B] Interface Simplified Schematic
DEVICE CALIBRATION AND ERROR CALCULATION
The measured transfer function of the ADL5519 at 2.14 GHz is
shown in Figure 24. The figure shows plots of both output
voltage vs. input power and calculated error vs. input power. As
the input power varies from 50 dBm to 0 dBm, the output
voltage varies from 0.4 V to about 2.8 V.
Figure 24. Transfer Function at 2.14 GHz.
Because slope and intercept vary from device to device, board-
level calibration must be performed to achieve high accuracy.
The equation for output voltage can be written as
V
OUT
=
Slope
× (
P
IN
Intercept
)
Where
Slope
is the change in output voltage divided by the
change in power (dB), and
Intercept
is the calculated power at
which the output voltage would be 0 V. (Note that
Intercept
is a
theoretical value; the output voltage can never achieve 0 V).
In general, the calibration is performed by applying two known
signal levels to the ADL5519’s input and measuring the
corresponding output voltages. The calibration points are
generally chosen to be within the linear-in-dB operating range
of the device (see the Specifications section for more details).
Calculation of the slope and intercept is done using the
equations:
Slope
= (
V
OUT1
V
OUT2
)/(
P
IN1
P
IN2
)
Intercept
=
P
IN1
(
V
OUT1
/
Slope
)
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