RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS150128

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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RFSA3713

Evaluation Board Jumper Programming

Jumpers

Connector

Signal

Position

U1 Connection

Comment

S1

P3

Logic

Voltage

0

VDD (From P1)

1

VIO (From P4)

S2

A0

0

GND

External Address

1

U1_VDD

S3

A1

0

GND

External Address

1

U1_VDD

S4

A2

0

GND

External Address

1

U1_VDD

Evaluation Board Programming Using USB Interface

Serial Addressable 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 P1

. Select ‘RFSA3713’ 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.

Note that the external address bits must all be set to ‘0’ when using the USB interface as the CGB software

does not have the capability to set the external address in the serial data stream at this time.

Evaluation Board Programming Using External Bus

Serial Addressable Mode

The configuration allows the user to control the attenuator through the P4 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 P4 connector. Note that the top row of P4 contains the serial bus signals and the bottom row is ground.

Programming jumper S1 is set to ‘0’. External address jumpers S2 through S4 can be set to any value desired by the

user. Apply the supply voltage P1. 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 default attenuation state is maximum (31.75dB) when supply voltage is applied to the attenuator. The LE signal

must be held to logic ‘0’ during power up.