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RFMD2081

DS140110

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Multi-Slice Mode

The Multi-Slice mode of operation allows up to four chips to be controlled from a common serial bus. The device address pins,

(15 and 16) ADD1 and ADD2, are used to set the address of each part.

On power up, and after a Reset, the devices ignore the address pins ADD1 and ADD2 and any data presented to the serial bus

will be programmed into all the devices. However, once the ADDR bit in the SDI_CTRL register is set each device then adopts

an address according to the state of the address pins on the device.

General Purpose Outputs

The general purpose outputs (GPOs) can be controlled via the GPO register, and will depend on the state of MODE since they

can be set in different states corresponding to either path 1 or 2. The GPOs can be used for example to drive LEDs, or to con-

trol external circuitry such as switches or low power LNAs.

Each GPO pin can supply up to and above 20mA load current. The output voltage of the GPO high state will drop with increased

current drive, by approximately 25mV/mA. Similarly the output voltage of the GPO low state will rise with increased current,

again by approximately 25mV/mA.

Programming Information

Please refer to the register map and programming guides which are available for download from

http://rfmd.com/products/IntSynthModulator/.

Evaluation Boards

The evaluation board for the RFMD2081 is provided as part of a design kit, along with the necessary cables and programming

software tool to enable full evaluation of the device. The evaluation board has been configured for wideband operation; the

modulator output is connected to a wideband transmission line transformer balun. Design kits can be ordered from

www.rfmd.com or from local RFMD sales offices and authorized sales channels. For ordering codes please see "Ordering Infor-

mation" on page 18. For further details on how to set up the design kits please refer to the user guide which can be down-

loaded from http://rfmd.com/products/IntSynthModulator/.

Slice2

(0)

Slice2

(1)

Slice2

(2)

Slice2

(3)

A 1 A 2

ENX

SDATA

SCLK

A 1 A 2

A 1 A 2

A 1 A 2