© 2018 Integrated Device Technology, Inc.

2

Rev O May 11, 2018

F1421 Datasheet

Pin Assignments

Figure 2.

Pin Assignments for 4mm x 4mm x 0.9mm QFN Package

– Top View

NC

NC

NC

NC

NC

NC

NC

NC

GND

GND

RFOUT

NC

EPAD

1

2

3

4

5

6

13

14

15

16

17

18

Control Circuit

Pin Descriptions

Table 1.

Pin Descriptions

Number

Name

Description

1 - 7, 12,

16 - 20, 24

NC

No internal connection. These pins can be left unconnected, have a voltage applied, or be connected to

ground (recommended).

8

STBY

Standby (HIGH = device power OFF, LOW/Open = device power ON). Internally this pin has a pull-down

resistor that is connected to GND.

9

RSET

Amplifier bias current setting resistor. Connect a

2.26kΩ resistor to ground.

10

RDSET

Amplifier second bias current setting resistor. Connect a

5.76kΩ resistor to ground.

11

Power supply for the amplifier.

13, 15, 21,

23

GND

Internally grounded. These pins must be grounded as close to the device as possible.

14

RFOUT

RF output. Must use an external DC block as close to the pin as possible.

22

RFIN

RF input internally matched to 50Ω. Must use an external DC block. The DC block should be placed as

close to the pin as possible for best RF performance.

– EPAD

Exposed paddle. Internally connected to ground. Solder this exposed paddle to a printed circuit board

(PCB) pad that uses multiple ground vias to provide heat transfer out of the device into the PCB ground

planes. These multiple ground vias are also required to achieve the specified RF performance.