RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS150129

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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RFSA3413

Evaluation Board Programming Using USB Interface

Parallel 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 ‘RFSA3413’ 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

Parallel Mode

This configuration allows the user to control the attenuator through the P1 connector using an external harness.

Remove the USB interface if it is currently installed on the evaluation board. Connect a user-supplied harness to the

P1 connector. The parallel bus signal names for P1 are indicated on the evaluation board. Cross reference for device

pin names to P1 connector signals is as follows: C1 = D2, C2 = D3, C4 = D4, C8 = D5. Apply the supply voltage to P3.

Send the appropriate signals onto the parallel bus lines in accordance with the Parallel Interface Attenuation Truth

Table. The attenuator is set to the desired state and measurements can be taken.

Default Power-up State

The default attenuation state is minimum (0dB) when supply voltage is applied to the attenuator. If a different

attenuation state is desired during power up, this can be accomplished by applying signals according to the Parallel

Interface Attenuation Truth Table. The attenuator will power up to the state applied to the parallel bus during turn on.