RFSA3714 Datasheet, PDF (13/20 Pages) RF Micro Devices – 50MHz to 6000MHz, Digital Step Attenuator

RFSA3714
Evaluation Board Jumper Programming
Jumpers
S1
S2
S6
Connector
P3
P4
Signal
Logic
Voltage
PBar/S
LE
Position
0
1
0
1
OPEN
INSTALLED
Note: Default jumper settings are BOLD.
U1 Connection
VDD (From P6)
VIO (From P5)
GND
U1_VDD
LE
LE (From P5 Pin 3)
Comment
Parallel Mode
Serial Mode
All Other Modes
Serial Mode Using P5
Evaluation Board Programming Using USB Interface
Serial Mode
All programming jumpers on the evaluation board are set to the default values indicated in the table. Refer to the
Control Bit Generator (CBG) Software Reference Manual for detailed instructions on how to setup the software for use.
Apply the supply voltage to P6. Select ‘RFSA3714’ from the RFMD parts list of the CBG user interface. Set the
attenuation value using the CBG user interface. The attenuator is set to the desired state and measurement can be
taken.
Latched Parallel Mode
Evaluation board programming jumper S2 is set to ‘0’. All other programming jumpers are not required and can be set
to any position. Refer to the Control Bit Generator Software Reference Manual for detailed instructions on how to set
up the software for use. Apply the supply voltage to P6. Select ‘RFSA3714-P’ from the RFMD part list of the CBG user
interface. Set the attenuation value using the CBG user interface. The attenuator is set to the desired state and
measurements can be taken.
Evaluation Board Programming Using External Bus
Serial Mode
The configuration allows the user to control the attenuator through the P5 connector using an external harness.
Remove the USB interface board if it is currently installed on the evaluation board. Connect a user-supplied harness to
the P5 connector. Note that the top row of P5 contains the serial bus signals and the bottom row is ground.
Programming jumper S1 is set to ‘0’ and S2 is set to ‘1’. Jumper S6 is installed and allows the LE signal to be routed
from the P5 connector to the attenuator. Apply the supply voltage P6. Send the appropriate signals onto the serial bus
lines in accordance with the Serial Mode Timing Diagram. The attenuator is set to the desired state and measurements
can be taken.
RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421
DS141203
For sales or technical support, contact RFMD at +1.336.678.5570 or [e-mail].
The information in this publication is believed to be accurate. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents or other rights of
third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended
application circuitry and specifications at any time without prior notice.
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