SKY12332-470LF - Skyworks Solutions, Inc.

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

201491A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 9, 2011 1

DATA SHEET

SKY12332-470LF: 10 MHz - 1.0 GHz Six-Bit Digital

Attenuator with Driver (0.5 dB LSB, 31.5 dB Range)

Applications

• Cellular base stations

• Wireless data transceivers

• Broadband systems

Features

• Attenuation: 31.5 dB with 0.5 dB LSB

• Onboard, low-noise CMOS driver

• Excellent RF noise floor

• Single 5 V supply

• Very low DC power consumption

• Single, positive control for each bit

• Small, QFN (32-pin, 5 x 5 mm) package (MSL1, 260 °C per

JEDEC J-STD-020)

Description

The SKY12332-470LF is a six-bit digital GaAs attenuator with an

onboard, low-noise CMOS driver. This attenuator offers excellent

performance from 10 MHz to 1.0 GHz, which makes it ideal for IF

and RF level control applications.

The SKY12332-470LF contains an onboard CMOS driver circuit

that accepts CMOS logic levels at the six control inputs and

produces a negative supply voltage to control the GaAs attenuator.

Figure 1. SKY12332-470LF Block Diagram

The device has excellent linearity for compatibility with non-

constant envelope signals such as WCDMA and OFDM. The six

attenuation bits are binary weighted with an LSB of 0.5 dB and a

total nominal attenuation range of 31.5 dB. The device also has

excellent attenuation accuracy and is monotonic. The low-noise

CMOS driver enables a very low RF noise floor, typically

–100 dBm.

The device is provided in a 5 x 5 mm, 32-pin 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 • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

2 March 9, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201491A

Figure 2. SKY12332-470LF Pinout – 32-Pin QFN

(Top View)

Table 1. SKY12332-470LF Signal Descriptions

Pin # Name Description Pin # Name Description

1 GND Ground 17 GND Ground

2 GND Ground 18 GND Ground

3 GND Ground 19 GND Ground

4 GND Ground 20 J2 RF input/output

5 J1 RF input/output 21 GND Ground

6 GND Ground 22 GND Ground

7 GND Ground 23 VDD Positive supply voltage input. Bypass this

pin to ground using a 10 nF or larger

capacitor.

8 GND Ground 24 C1 External charge pump capacitor interface

9 GND Ground 25 C2 External charge pump capacitor interface

10 GND Ground 26 VSS Negative supply voltage input. Bypass this

pin to ground using a 10 nF or larger

capacitor.

11 GND Ground 27 V6 Control voltage input for 16 dB, MSB

12 GND Ground 28 V5 Control voltage input for 8 dB

13 GND Ground 29 V4 Control voltage input for 4 dB

14 GND Ground 30 V3 Control voltage input for 2 dB

15 GND Ground 31 V2 Control voltage input for 1 dB

16 GND Ground 32 V1 Control voltage input for 0.5 dB

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

201491A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 9, 2011 3

Functional Description

The SKY12332-470LF is composed of a silicon CMOS die and a

GaAs digital attenuator die. The CMOS die contains a charge pump

circuit that generates a negative voltage (VSS) from the positive

supply voltage (VDD). It decodes the six-bit control word applied to

pins V1 through V6, and it drives the corresponding switching

Field-Effect Transistors (FETs) on the GaAs attenuator die. This

circuit is optimized to produce the lowest possible noise in the RF

signal path.

The GaAs attenuator die is comprised of six resistive, fixed

attenuator sections with nominal input and output impedance of

50 Ω. The attenuation of these sections is binary weighted and

ranges from 0.5 dB, nominal, up to 16 dB nominal. These

attenuator sections are either switched into or out of the main

signal path between pins J1 and J2 according to the six-bit

control word applied to pins V1 through V6.

The switching is performed by depletion mode Metal

Semiconductor FETs (MESFETs) on the attenuator die. The charge

pump circuit on the CMOS die generates the negative voltage

(VSS), nominally –3.75 V, required to enable reverse bias of the

gate-source of the MESFETs that must be switched to high drain-

source impedance to properly select or bypass the fixed resistive

attenuator sections.

Electrical and Mechanical Specifications

The absolute maximum ratings of the SKY12332-470LF are

provided in Table 2. Electrical specifications are provided in

Table 3.

Typical performance characteristics of the SKY12332-470LF are

illustrated in Figures 3 through 6.

The state of the SKY12332-470LF is determined by the logic

provided in Table 4.

Table 2. SKY12332-470LF Absolute Maximum Ratings

Parameter Symbol Minimum Maximum Units

Supply voltage VDD 6.0 V

RF input power:

50 MHz to 500 MHz

>500 MHz

0.5

2.0

Supply current IDD 2 mA

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.

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

4 March 9, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201491A

Table 3. SKY12332-470LF Electrical Specifications (Note 1)

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

Parameter Symbol Test Condition Min Typical Max Units

Insertion loss IL 10 MHz to 500 MHz

500 MHz to 1 GHz

1.5

1.8

2.2

Attenuation range 31.5 dB

Attenuation accuracy Attenuation referred to

insertion loss:

10 MHz to 500 MHz

500 MHz to 1 GHz

±(0.20 + 2% of attenuation setting)

±(0.25 + 3% of attenuation setting)

RF I/O VSWR VSWR Non-driven port

terminated in ZO, 10 MHz

to 1 GHz

1.4:1 1.6:1 –

Control voltage:

Low

High

VCTL

2.7

0.8

VDD

Control current:

Low

High

ICTL

μA

Switching characteristics:

Rise/fall time

On/off time

Video feedthrough

tR/tF

tON/tOFF

10/90% or 90/10% of RF

50% VCTL to 90/10% of RF

tR = 1 ns, bandwidth =

500 MHz

1 dB Input Compression Point IP1dB 50 MHz

500 MHz to 1 GHz

+22

+29

dBm

3rd Order Input Intercept Point IIP3 2 input tones, +5 dBm

each tone:

50 MHz

500 MHz to 1 GHz

+36

+48

dBm

Supply voltage VDD 4.75 5.00 5.25 V

Supply current IDD 700 μA

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

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

201491A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 9, 2011 5

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. Input VSWR vs Frequency

Figure 4. Attenuation Accuracy vs Frequency

Figure 6. Output VSWR vs Frequency

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

6 March 9, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201491A

Table 4. SKY12332-470LF Truth Table

J1-J2 (Pins 5 & 20)

Attenuation

(Pin 27)

(Pin 28)

(Pin 29)

(Pin 30)

(Pin 31)

(Pin 32)

Insertion loss 0 0 0 0 0 0

0.5 dB 0 0 0 0 0 1

1.0 dB 0 0 0 0 1 0

2.0 dB 0 0 0 1 0 0

4.0 dB 0 0 1 0 0 0

8.0 dB 0 1 0 0 0 0

16 dB 1 0 0 0 0 0

31.5 dB 1 1 1 1 1 1

Note

: “1” = high control voltage: +2.7 to VDD.

“0” = low control voltage: 0 to +0.8 V.

Evaluation Board Description

The SKY12332-470LF Evaluation Board is used to test the

performance of the SKY12332-470LF digital attenuator. An

Evaluation Board schematic diagram is shown in Figure 7. An

assembly drawing for the Evaluation Board is shown in Figure 8.

Package Dimensions

The PCB layout footprint for the SKY12332-470LF is provided in

Figure 9. Typical case markings are shown in Figure 10. Package

dimensions for the 32-pin QFN are shown in Figure 11, and tape

and reel dimensions are provided in Figure 12.

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 SKY12332-470LF 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.

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

201491A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 9, 2011 7

Figure 7. SKY12332-470LF Evaluation Board Schematic Diagram

*** TBD ***

Figure 8. Evaluation Board Assembly Diagram

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

8 March 9, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201491A

Figure 9. SKY12332-470LF PCB Layout Footprint

(Top View)

Figure 10. Typical Part Markings

(Top View)

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

201491A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 9, 2011 9

Figure 11. SKY12332-470LF 32-Pin QFN Package Dimensions

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

10 March 9, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201491A

Figure 12. SKY12332-470LF Tape and Reel Dimensions

DATA SHEET • SKY12332-470LF SIX-BIT DIGITAL ATTENUATOR

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

201491A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 9, 2011 11

Ordering Information

Model Name Manufacturing Part Number Evaluation Board Part Numbers

SKY12332-470LF Digital Attenuator SKY12332-470LF SKY12332-470LF-EVB

Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by

Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the

information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to

update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.

No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or

information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of

Sale.

THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A

PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY

DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS

SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION,

LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury,

death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any

damages resulting from such improper use or sale.

Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of

products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for

applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.

Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands

and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com,

are incorporated by reference.