DATA SHEET • SKY66108-11: 2.4 GHz SMART ENERGY/ZIGBEE FRONT-END MODULE

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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April 16, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202969B

Table 1. SKY66108-11 Signal Descriptions

Pin

Name

Description

Pin

Name

Description

1

VCC1

Positive supply

12

CSD

Sleep mode control

2

VB_IN

Bias voltage input supply to the transceiver (see Figure 3)

13

ANT

Connect to 50

Ω antenna

3

TRXP

Input/output signal to the transceiver, 100

Ω differential

14

N/C

Not connected

4

TRXN

Input/output signal to the transceiver, 100

Ω differential

15

N/C

Not connected

5

N/C

Not connected

16

N/C

Not connected

6

VCC

Positive supply

17

N/C

Not connected

7

N/C

Not connected

18

GND

Connect to PCB ground

8

CPS

Bypass mode control, connect to RFIC or SoC GPIO

19

VCC2

Positive supply

9

GND

Connect to PCB the ground

20

GND

Connect to PCB ground

10

CRX

Receive function control

Paddle

GND

Exposed die paddle; electrical and thermal ground; connect to

PCB ground

11

CTX

Transmit function control

The balun at the FEM PA input (or LNA output) can also be used to inject a bias

operating point for the transceiver output stage (the shunt inductor provides a DC

path on the other side). The inductor also tunes out any parasitic capacitance.

If the SOIC transceiver does not require a DC bias, leave the VB_IN open.

CPS

CSD

CTX

FEM

SoIC

VDD_PA

VB_IN

1 pF

1 pF

2n7

1 k

placed close to the SKY66108-11 pins.

Optional Output Filter

Y1902

Differential source

or load impedance symbol

Input

Input

1.8 V

1.8 V

Decoupling capacitor

on chip

Internal Lattice Balun

Figure 3. Injecting a Bias Operating Point for the Transceiver Output Stage