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ADL9005ACPZN-R7 датащи(PDF) 23 Page - Analog Devices

номер детали ADL9005ACPZN-R7
подробное описание детали  Wideband, Low Noise Amplifier, Single Positive Supply, 0.01 GHz to 26.5 GHz
PDF  24 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADL9005ACPZN-R7 датащи(HTML) 23 Page - Analog Devices

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Data Sheet
ADL9005
Rev. 0 | Page 23 of 24
PROVIDING DRAIN BIAS THROUGH THE
ACG4/VDD2 PIN
An alternative way to bias the ADL9005 is through the ACG4/VDD2
pin (Pin 24), which is shown in Figure 78. Because of the voltage
drop across the internal bias resistor, a higher VDD is required.
If a 300 Ω bias resistor (R1) is used and connected to the 5 V
power supply, which results in a total current of 80 mA, a VDD
of 8.5 V is recommended. R1 can also be connected to the VDD
of 8.5 V. In this case, to set IDQ to 80 mA, use an R1 value of
850 Ω on RBIAS. The performance of this circuit is summarized
in Figure 67 to Figure 72.
2
1
3
4
5
6
18
17
16
15
14
13
R1
300Ω
C4
100pF
CIN
0.1µF
RF INPUT
RFIN
RBIAS
C9
0.01µF
RFOUT/VDD
C7
4.7µF
C10
100pF
C11
0.01µF
C6
4.7µF
COUT
0.1µF
RF
OUTPUT
VDD
(8.5V)
5V
ADL9005
Figure 78. Providing Resistive Drain Bias Through the ACG4/VDD2 Pin
POWER-UP AND POWER-DOWN SEQUENCING
Apply the RF input signal after the main supply voltage and
the voltage driving RBIAS (R1 in Figure 74 and Figure 78) and
remove the RF input signal before the main supply voltage and
the voltage on RBIAS are turned off. The voltage on RBIAS can either
be applied simultaneously with VDD or after VDD is applied.



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