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F2270 Datasheet

January 16, 2019

Evaluation Kit Operation

Below is a basic setup procedure for configuring and testing the F2270 Evaluation Kit (EVKit).

Pre-Configure EVKit

This section is a guide to setting up the EVKit for testing. To configure the board for a negative attenuation slope (increasing attenuation with

increasing VCTRL voltage), install a header-shunt shorting pin 2 (center pin) and pin 3 (labeled Lo) on header J7 (see Figure 58). For a positive

slope (decreasing attenuation with increasing VCTRL voltage), this header-shunt should short pin 1 (labeled Hi) to pin 2 (center pin) on J7.

Power Supply Setup

Without making any connections to the EVKit, set up one fixed power supply (VCC) for 5V with a current limit of 10mA and one variable power

supply (VCTRL) set to 0V with a current limit of 5mA. Disable both power supplies.

RF Test Setup

Set the RF test setup to the desired frequency and power ranges within the specified operating limits noted in this datasheet.

Disable the output power of all the RF sources.

Connect EVKit to the test setup.

With the RF sources and power supplies disabled, connect the fixed 5V power supply to connector J3, the variable supply to J4, and the RF

connections to the desired RF ports.

Powering Up the EVKit

Enable the VCC power supply and observe a DC current of approximately 1.4mA.

Enable the VCTRL power supply.

Enable the RF sources. Verify that the DC current remains at about 1.4mA.

If the J7 connection is set for a negative (positive) attenuation slope, then increasing the variable supply will produce increased (decreased)

attenuation for the attenuator path (J1 to J2).

Powering Down the EVKit

Disable the RF power applied to the device.

Adjust the VCTRL power supply down to 0V and disable it.

Disable the VCC power supply.

Disconnect the EVKit from the RF test setup.

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