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 customerservice@rfmd.com.

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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RFSA3714

Evaluation Board Jumper Programming

Jumpers

Connector

Signal

Position

U1 Connection

Comment

S1

P3

Logic

Voltage

0

VDD (From P6)

1

VIO (From P5)

S2

PBar/S

0

GND

Parallel Mode

1

U1_VDD

Serial Mode

S6

P4

LE

OPEN

LE

All Other Modes

INSTALLED

LE (From P5 Pin 3)

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 voltag

e 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 supp

ly 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.