SKY12325-350LF-EVB - SKYWORKS SOLUTIONS

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

200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 1

DATA SHEET

SKY12325-350LF: 0.5-6.0 GHz Three-Bit Digital Attenuator

(1 dB LSB)

Applications

• Cellular Bluetooth® systems

• General-purpose level control

Features

• Broadband operation: 0.5 to 6.0 GHz

• Attenuation: 7 dB

• Positive control voltage

• Resolution: 1 dB

• Miniature QFN (16-pin, 3 x 3 mm) package (MSL1, 260 °C per

JEDEC J-STD-020)

Figure 2. SKY12325-350LF Pinout – 16-Pin QFN

(Top View)

Figure 1. SKY12325-350LF Block Diagram

Description

The SKY12325-350LF is a three-bit digital attenuator. The

attenuation bits are binary weighted, with the Least Significant Bit

(LSB) equal to 1 dB. States are selected by three positive voltage

control inputs (pins V1, V2, and V3). DC blocking capacitors are

required at each RF port. Both RF ports are absorptive.

The SKY12325-350LF is provided in a miniature 3 x 3 mm, 16-pin

exposed pad plastic Quad Flat No-Lead (QFN) package. A

functional block diagram is shown in Figure 1. The pin

configuration and package are shown in Figure 2. Signal pin

assignments and functional pin descriptions are provided in

Table 1.

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

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Table 1. SKY12325-350LF Signal Descriptions

Pin # Name Description Pin # Name Description

1 N/C No connection 9 N/C No connection

2 J1 RF input or output port. An external 47 pF

(recommended value) DC blocking capacitor

is required.

10 N/C No connection

3 N/C No connection 11 J2 RF input or output port. An external 47 pF

(recommended value) DC blocking capacitor

is required.

4 N/C No connection 12 N/C No connection

5 GND Ground 13 V1 High impedance control voltage input for

4 dB weighted bit (MSB)

6 GND Ground 14 V2 High impedance control voltage input for

2 dB weighted bit

7 GND Ground 15 V3 High impedance control voltage input for

1 dB weighted bit (LSB)

8 N/C No connection 16 VDD Supply voltage

Note: Exposed paddle must be grounded.

Table 2. SKY12325-350LF Absolute Maximum Ratings

Parameter Symbol Minimum Maximum Units

RF input power PIN +30 dBm

Supply voltage VS +6 V

Control voltage VCTL 0 +6 V

Operating temperature TOP –40 +85 °C

Storage temperature TSTG –65 +150 °C

Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other

parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.

CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device

must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body

or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.

Electrical and Mechanical Specifications

The absolute maximum ratings of the SKY12325-350LF are

provided in Table 2. Electrical specifications are provided in

Table 3.

Typical performance characteristics of the SKY12325-350LF are

illustrated in Figures 3 through 6.

The state of the SKY12325-350LF is determined by the logic

provided in Table 4.

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 3

Table 3. SKY12325-350LF Electrical Specifications (Note 1)

(VCTL = 0/5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted)

Parameter Symbol Test Condition Min Typical Max Units

Insertion loss IL 0.5 to 3.0 GHz

3.0 to 4.5 GHz

4.5 to 6.0 GHz

0.7

0.9

1.3

0.9

1.1

1.5

Attenuation ATTN 7 dB

Attenuation accuracy 0.5 to 4.0 GHz

4.0 to 6.0 GHz

±(0.2 + 3% of attenuation setting)

±(0.3 + 3% of attenuation setting)

Return loss RL 0.5 to 3.5 GHz

3.5 to 6.0 GHz

1 dB Input Compression Point IP1dB 0.5 to 6.0 GHz

VDD = 3 V

VDD = 5 V

+24

+27

dBm

3rd Order Input Intercept Point IIP3 0.5 to 6.0 GHz, for two-

tone input power,

+5 dBm/tone, Δf = 1 MHz

VLOW = 0 V, VHIGH = 3 V

VLOW = 0 V, VHIGH = 5 V

+44

+47

dBm

Control voltage:

High

Low

VCTL_H

VCTL_L

VDD – 0.2

VDD + 0.2

0.8

Control port current ICTL VCTL_L

VCTL_H

μA

Supply voltage VS 2.7 5.5 V

Note 1: Performance is guaranteed only under the conditions listed in this Table.

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

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Typical Performance Characteristics

(VDD = 5 V, TOP = +25 °C, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted)

Figure 3. Insertion Loss vs Frequency

Figure 5. Attenuation Error vs Frequency

Figure 4. Attenuation vs Frequency

(Normalized to Insertion Loss)

Figure 6. Return Loss vs Frequency

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 5

Table 4. SKY12325-350LF Truth Table

Attenuation (Note 1)

(dB)

(Pin 13)

(Pin 14)

(Pin 15)

7 Low Low Low

6 Low Low High

5 Low High Low

4 Low High High

3 High Low Low

2 High Ow High

1 High High Low

0 High High High

Note

1: Attenuation normalized to insertion loss.

Note 2

: High = +2.7 V to 5.5 V. “Low” = –0.2 V to +0.2 V.

Package Dimensions

The PCB layout footprint for the SKY12325-350LF is shown in

Figure 7. Typical case markings are noted in Figure 8. Package

dimensions for the 16-pin QFN are shown in Figure 9, and tape

and reel dimensions are provided in Figure 10.

Package and Handling Information

Instructions on the shipping container label regarding exposure to

moisture after the container seal is broken must be followed.

Otherwise, problems related to moisture absorption may occur

when the part is subjected to high temperature during solder

assembly.

THE SKY12325-350LF is rated to Moisture Sensitivity Level 1

(MSL1) at 260 °C. It can be used for lead or lead-free soldering.

For additional information, refer to the Skyworks Application Note,

Solder Reflow Information, document number 200164.

Care must be taken when attaching this product, whether it is

done manually or in a production solder reflow environment.

Production quantities of this product are shipped in a standard

tape and reel format.

Figure 7. SKY12325-350LF PCB Layout Footprint

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

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Figure 8. Typical Part Markings

Figure 9. SKY12325-350LF 16-Pin QFN Package Dimensions

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 7

Figure 10. SKY12325-350LF Tape and Reel Dimensions

DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR

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

8 April 22, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200423D

Ordering Information

Model Name Manufacturing Part Number Evaluation Board Part Numbers

SKY12325-350LF Digital Attenuator SKY12325-350LF SKY12325-350LF-EVB

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