UG-1759
Rev. A | Page 11 of 21
RF GAIN CONTROL
To adjust the RF gain control on either the ADMV4530IQ-
EVALZ or the ADMV4530IF-EVALZ evaluation board, take
the following steps:
1.
Connect a power supply to the RF_GAIN_TP test point
and one ground test point on the ADMV4530IQ-EVALZ
or ADMV4530IF-EVALZ evaluation board. Alternatively,
the power supply can be connected to the RF_GAIN SMA
port. The power supply current limit must be set to 1 mA.
2.
Adjust the power supply voltage as desired from 0 V to
1.8 V. The maximum gain corresponds to 1.8 V, and the
minimum gain corresponds to 0 V. Refer to the
data sheet for more information regarding
gain performance.
IF GAIN CONTROL
To adjust the IF gain control on ADMV4530IF-EVALZ
evaluation board, take the following steps:
1.
Connect a power supply to the IF_GAIN_TP test point
and one ground test point on the ADMV4530IF-EVALZ
evaluation board. Alternatively, the power supply can be
connected to the IF_GAIN SMA port. The power supply
current limit must be set to 1 mA.
2.
Adjust the power supply voltage as desired from 0 V to
3.3 V. The maximum gain corresponds to 0 V, and the
minimum gain corresponds to 3.3 V. Refer to the
data sheet for more information regarding
gain performance.
AUTOMATED CHIP RESET
If a reset of the
chip is required on the
ADMV4530IQ-EVALZ or ADMV4530IF-EVALZ evaluation
board, it is recommended to use the automated reset sequence.
Click
Reset Chip
(see Figure 9, Label K3 and Table 1 for
additional information). This automated sequence performs
the following actions:
general-purpose input/outputs (GPIOs)
to a low state, which sets both the RST and PD pins of the
low.
Toggles the RST pin high to bring the
back to the normal operating state.
Programs Register 0x00 to 0x81, which also resets the
. This step covers legacy boards that did not
have the RST pin connected.
Programs Register 0x00 to 0x18 to enable the SDO pin on
the
Programs the recommended mixer settings for IF mode.
Programs the PLL for a 28 GHz LO frequency anticipating
a 200 MHz reference input frequency.
Reads back the register settings of the
MANUAL CHIP RESET
For manual reset operations, the following outlines various
ways to perform a reset.
There is a reset button (S1) on the ADMV4530IQ-EVALZ
or the ADMV4530IF-EVALZ evaluation board. Pressing
this button pulls the RST pin low to initiate a reset to the
factory power-up state.
The RST pin can also be pulled low from within the
software by using the dropdown menu in the lower left
corner of Figure 9 (see Label G). When using this option,
be sure to return the dropdown menu back to
Normal
Operation
after resetting the device.
Register 0x00 can be programmed to 0x81 to initiate a
reset of the
Regardless of the manual reset option used, it is recommended
to perform the following after the device resets:
Program Register 0x00 to 0x18 to enable the SDO pin on
the
Read back all registers on the
LOSS OF BOARD COMMUNICATION
When the
is turned off and then on, or if the USB
cable is unplugged and plugged back in while the
is open, communication with the
may be lost. To
regain communication, click the
System
tab, click the USB
symbol in the
SDP-S Controller
subsystem, and then click
Acquire
. If this step does not work, restart the
reinitiate communication with the ADMV4530IQ-EVALZ or the
ADMV4530IF-EVALZ evaluation board.
REGULATOR BYPASS
Both the ADMV4530IQ-EVALZ and the ADMV4530IF-
EVALZ evaluation boards have voltage regulators that allow
the user to operate these evaluation boards from a single 5 V dc
power supply. The on-board voltage regulators supply several
bias voltages to the various supply pins on the chip. If desired,
these voltage regulators can be bypassed by removing the 0 Ω
registers (R25 to R28) from the ADMV4530IQ-EVALZ or the
ADMV4530IF-EVALZ evaluation board and then by injecting
each voltage independently by using the corresponding test points.
See the schematics for details (see Figure 13 and Figure 19).
