EVAL-ADGM1004EBZ User Guide UG-1078
Rev. 0 | Page 3 of 11
EVALUATION BOARD HARDWARE
The ADGM1004 evaluation kit contains a fully fitted, printed
circuit board (PCB).
The EVA L-ADGM1004EBZ evaluation board allows the user to
connect RF signals to the MEMS switch. The user controls the
switch operation using the on-board links or by applying the
correct control signals to the appropriate connectors.
The EVA L-ADGM1004EBZ provides an additional transmission
line to facilitate the calibration of the network analyzer to
minimize the effects of the PCB tracks that connect the RF
signals to the MEMS switch. This user guide describes the
calibration process in detail (see the Network Analyzer
Calibration Procedure section).
POWER SUPPLY
To operate the EVA L -ADGM1004EBZ, the user must provide
an external power supply connected to the power block, P1.
The supply voltage is 3.3 V and must be positive with respect
to the ground of the E VA L -ADGM1004EBZ. The ground of the
EVA L-ADGM1004EBZ is marked with GND on the silkscreen
near P1 (see Figure 12).
RF CONNECTORS
The SMA edge connectors on the EVA L-ADGM1004EBZ (RF1
to RF4 and RFC) connect to each switch in the ADGM1004 for
performance evaluation purposes. The RF5 and RF6 connectors
connect to a transmission line to estimate the loss associated with
the PCB (see the Measuring Switch Performance section). Table 1
describes the RF connectors to the ADGM1004.
Table 1. Connecting the RF Connectors to the ADGM1004
Connector Description
RF1 Port RF1 of the ADGM1004
RF2 Port RF2 of the ADGM1004
RF3 Port RF3 of the ADGM1004
RF4 Port RF4 of the ADGM1004
RFC Common RF port of the ADGM1004
RF5, RF6 CALIBRATION THRU transmission lines used for
calibration
SWITCH CONTROL CONNECTORS
The control integrated circuit (IC) packaged with the MEMS
switch internally generates the voltage required to drive the switch.
The internal control IC contains a reference clock signal at a
nominal 11.5 MHz. In normal operation, set the (EXTD_EN)
link to low, enabling the built-in 11.5 MHz oscillator to enable
the internal driver IC voltage boost circuitry. Note that in Figure 1,
this link is shown in parentheses on the evaluation board. Set
(EXTD_EN) to high to disable the internal 11.5 MHz oscillator and
drive V
CP
with 80 V dc from the external voltage supply. Disabling
the internal oscillator eliminates the associated 11.5 MHz noise
feedthrough into the switch. With the oscillator disabled, the
logic interface pins (IN1 to IN4) still control the switch.
The ADGM1004 comes with a standard LVTTL parallel interface
consisting of four input pins, IN1 to IN4. The logic level applied to
the IN1 through IN4 inputs controls the state of the MEMS
switches.
Table 2. (EXTD_EN) Link Position
Position Reference Clock Setting
Low (default) Built in 11.5 MHz oscillator enable
High Disables the internal oscillator
(RF1), (RF2), (RF3), and (RF4) Mode Mode of Operation
The IN1 to IN4 input pins control the switch state and operation
mode of the ADGM1004. The EVA L-ADGM1004EBZ allows the
user to control these pins by using the (RF1) to (RF4) links or
by applying external signals to the SMB connectors, IN1 to IN4,
respectively (see Table 3).
