RF5222 datasheet(5/8 Pages) RFMD

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RF5222

Rev A0 DS070717

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

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

Theory of Operation and Application Information

The RF5222 is a two-stage power amplifier (PA) with a minimum gain of 26dB in the 2.4GHz to 2.5GHz ISM band. The RF5222

has integrated input and interstage matching components thus allowing minimal bill of materal (BOM) parts count in end appli-

cations. The RF5222 is designed primarily for IEEE802.11b/g/n WLAN applications where the available supply voltage and

current are limited. This amplifier will operate to (and below) the lowest expected voltage made available by a typical PCMCIA

slot in a laptop PC, and will maintain required linearity at decreased supply voltages. The device is provided in a

2.2mmx2.2mmx0.45mm, 8-pin, QFN with backside ground.

The RF5222 requires only a single positive supply of 3.3V nominal to operate to full specifications. Power control is provided

through one bias voltage pin (VREG). The input DC blocking cap is provided internally and the evaluation board circuit (available

from RFMD, Inc. (RFMD)) is optimized for 3.3VDC applications. For best performance, it is important to duplicate (as closely as

possible) the layout of the evaluation board. The RF5222 has primarily been characterized with a voltage on VREG of 3.1VDC. If

you prefer to use a bias voltage that is significantly different than 3.1VDC, or a different frequency than the recommended fre-

quency range, contact RFMD Sales or Application Engineering for additional data and guidance.

There is no required matching on the RF5222 input or interstage circuits. Only the RF5222 output stage requires matching

allowing the RF5222 to be implemented in applications requiring the fewest end product bill of materials (BOM) parts count

and lowest BOM cost. In most cases, the capacitor used as part of the RF5222 output matching circuit is also employed to

accomplish DC-blocking. The RF5222PCBA evaluation board (available from RF Micro Devices, Inc. (RFMD)) is optimized for

3.3VDC supply input.

For best results, the PA circuit layout from the evaluation board should be copied as closely as possible, particularly the ground

layout and ground vias. Other configurations may also work, but the design process is much easier and quicker if the layout is

copied from the RF5222 evaluation board. Gerber files of RFMD PCBA designs can be provided on request. The RF5222 is a

very easy part to implement, but care in circuit layout and component selection is always advisable when designing circuits to

operate at 2.5GHz. The RF5222 evaluation board layout and schematic are available using 0201 (US) size components which

will help shrink the overall size of the total area of the PA and components of the intended design. Please contact RFMD Sales

or Application Engineering for additional data and guidance.

RF5222 Datasheet(PDF) 5 Page - RF Micro Devices