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ADL5605-EVALZ Datasheet(PDF) 16 Page - Analog Devices
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ADL5605-EVALZ Datasheet(HTML) 16 Page - Analog Devices
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Rev. 0 | Page 16 of 20
The schematic of the ADL5605 evaluation board is shown in
Figure 36. The evaluation board uses 25 mils wide, 50 Ω traces
and is made from IS410 material with a 20 mils gap to ground.
The evaluation board is tuned for operation at 943 MHz. The
inputs and outputs should be ac-coupled with appropriately
sized capacitors; therefore, for low frequency applications, the
value of C1 and C2 may need to be increased. DC bias is
provided to the output stage via an inductor (L1) connected
to the RFOUT pin. A bias voltage of 5 V is recommended.
The evaluation board has a short, non-50 Ω line on its output
to accommodate the four output pins and to allow for easier low
inductance output matching. The pads for Pin 9 to Pin 12 are
included on this microstrip line and are included in all matches.
The evaluation board uses numbers as identifiers to aid in the
placement of matching components at both the RF input and
RF output of the device. Figure 37 and Figure 38 show images
of the board layout.
Figure 36. Evaluation Board, 943 MHz Frequency Tuning Band
Table 8. Evaluation Board Configuration Options, 943 MHz Frequency Tuning Band
Input/output dc blocking capacitors.
C1, C2 = 100 pF
C3, C4, C5, C6, C7,
C8, C9, C10, C11,
C12, C13, C14
Power supply decoupling capacitors. Power supply decoupling capacitors are required to
filter out the high frequency noise on the power supply. The smallest capacitor should be the
closest to the ADL5605. The main bias that goes through RFOUT is the most sensitive to noise
because the bias is connected directly to the RF output.
C3 = 10 pF
C5, C7, C12 = 100 pF
C6, C8, C13 = 0.01 μF
C9, C11, C14 = 10 μF
C4, C10 = open
Input matching capacitor. To match the ADL5605 at the 943 MHz or 881 MHz frequency tuning
is not required. For the 748 MHz frequency tuning band, C
is set at a specific distance
from the device so that the microstrip line can act as inductance for the matching network
(see Table 7). If space is at a premium, an inductor can take the place of the microstrip line.
Output matching capacitor. The output match is set for 943 MHz and is easily changed for
other frequency tuning bands. The tolerance of this capacitor should be tight. C
is set at
a specific distance from the device so that the microstrip line can act as inductance for the
matching network (see Table 7). If space is at a premium, an inductor can take the place of the
microstrip line. A short length of low impedance line on the output is embedded in the match.
= 8.0 pF HQ
Output matching inductor. The output match is set for 943 MHz and is easily changed for other
frequency tuning bands. A high Q Coilcraft inductor with tight tolerance is recommended.
L2 = 1.6 nH HQ
The main bias for the ADL5605 comes through L1 to the output stage. L1 should be high
impedance for the frequency of operation while providing low resistance for the dc current.
The evaluation board uses a Coilcraft 0603HP-18NX_LU inductor; this 18 nH inductor provides
some of the match at 943 MHz.
L1 = 18 nH
R1, R2, R4, R5
To provide bias to all stages through just one supply, set R1 and R2 to 0 Ω, and leave R4 and
R5 open. To provide separate bias to stages, set R1 and R2 to open and R4 and R5 to 0 Ω.
R1, R2 = 0 Ω
R4, R5 = open
The paddle should be connected to both thermal and electrical ground.
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