ADL5592-EVALZ AD [Analog Devices], ADL5592-EVALZ Datasheet - Page 18

• Manufacturer Part Number: ADL5592-EVALZ
• Description: 250 MHz to 2400 MHz RF Variable Gain Amplifier
• Manufacturer: AD [Analog Devices]

ADL5592
CONFIGURATION OPTIONS
Table 6. Evaluation Board Configuration Options
Component
Designator
TP1A, TP2A
L1A, L2A, C4A to
C11A, R4A, R5A
C14A, C17A
C1A to C3A
SW1A, SW2A,
R8A, R12A
R1A to R3A, R9A
to R11A
Component Name
Supply and ground vector pins
Power supply decoupling
Input and output interfaces
Mixer input and output interfaces
Loopback enable interface
Serial control interface
Description
The nominal power supply decoupling is accomplished by using
a 100 pF (C4A, C6A, and C10A) in addition to either a 0.1 μF (C5A
and C7A) or a 10 μF (C11A) capacitor at each power supply pin. A
series inductor, L2A, is used to bias the open collector at Pin 21. To
tune the ADL5592 for the low bands (450 MHz, 850 MHz, and 900
MHz), the value should be 270 nH. For the high bands (1800 MHz
and 1900 MHz), the inductor should be changed to 33 nH.
C14A and C17A are dc blocks. The SMA labeled IN_ATTA is used to
drive the RF input. The SMA labeled RF_OUTA corresponds to the RF
output.
C1A to C3A are dc blocks. The SMA labeled LOPA drives the
balanced differential mixer input with a single-ended LO source.
The unused differential input is ac-coupled to ground. The SMA
labeled MX_OUTA corresponds to the mixer output. To use this
function, the loopback mode must be enabled.
Normal transmit mode is exercised by applying a logic high voltage
to the LOOP EN pin, setting Switch SW1A to the position opposite
Label O. For loopback mode, a logic low voltage must be applied to
the LOOP EN pin by setting both Switch SW1A and Switch SW2A to
the positions closest to the O labels. To exercise the control function
from an external source, Switch SW1A must be set to the position
closest to the O label and Switch SW2A must be set to the opposite
position. The signal is driven from the LBENBA SMA.
The evaluation board can be controlled using most PCs. Windows®-
based control software is shipped with the evaluation kit. A 25-pin
D-subadapter and cable are required to connect the PC to the SPI
port test points on the evaluation board. In some cases, the quality
of the PC port signals can be improved by adding capacitance to
R1A to R3A. The addition of 50 Ω values for R1A to R3A allow for SPI
port control from digital generators driven from the SMAs
connectors, SPI_DATA-A, SPI_CLK-A, and SPI_SEL-A.
Rev. 0 | Page 18 of 20
Default
Conditions
Not applicable
L2A = 270 nH or
33 nH (Size 0603)
(Coilcraft 0603CS);
C4A, C6A, C10A =
100 pF (Size 0402);
C5A, C7A = 0.1 μF
(Size 0402); C11A =
10 μF (Size 0402);
R4A, R5A = 0 Ω
(Size 0402); C8A,
C9A = open (Size
0402)
C14A, C17A =
1000 pF (Size 0402)
C1A = 1000 pF (Size
0402); C2A, C3A =
0.1 μF (Size 0402)
SW1A, SW2A =
installed; R8A = 0 Ω
(Size 0402); R12A =
10 kΩ (Size 0402)
R1A, R2A, R3A =
open (Size 0402);
R9A, R10A, R11A =
0 Ω (Size 0402)