QPC6614 Datasheet, PDF (11/15 Pages) RF Micro Devices – Digital Step Attenuator

QPC6614
Evaluation Board Programming Using USB Interface
Serial Mode
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 P3. Select QPC6614 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 measurements can be taken.
Evaluation Board Programming Using External Bus
Serial Mode
This configuration allows the user to control the attenuator through the P1 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 P1 connector. Note the top row of the P1 contains the serial bus signals and
the bottom row is ground. Apply the supply voltage to P3. 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.
Default Power-up State
The attenuation state set during power-up can be controlled using the PUP2 pin. To power-up in the maximum
attenuation state, apply a logic low to PUP2 pin prior to applying supply voltage VDD. To power-up in the
minimum attenuation state apply a logic high to the PUP2 pin prior to applying supply voltage VDD.
Revision DS20150821
© 2015 RF Micro Devices, Inc.
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Disclaimer: Subject to change without notice
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