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PRELIMINARY DATA SHEET
SKY12325-350LF: 3-Bit Digital Attenuator 500 MHz-6 GHz, 1 dB LSB
Features
Broadband: 500 MHz-6 GHz Attenuation range: 7 dB Positive control voltage Resolution: 1 dB Miniature QFN-16 3 x 3 mm package Available lead (Pb)-free and RoHS-compliant
Functional Block Diagram
RF Input/Output
V1
4 dB
2 dB V2
Applications

Cellular BTS General-purpose level control
V3
1 dB
Description
The SKY12325-350 is a 3-bit digital attenuator in a low cost QFN-16, 3 x 3 mm package. The attenuation bits are binary weighted, with the least significant bit (LSB) 1 dB. States are selected by 3 positive-voltage control inputs. DC blocking capacitors are required at each RF port. Both RF ports are absorptive. The QFN-16 package is lead (Pb)-free and complies with current RoHS requirements. The attenuator can operate over the temperature range of -40 C to +85 C.
RF Input/Output
NEW
Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances)-compliant packaging.
Electrical Specifications at 25C
VCTL = 0 V/5V, T = 25 C, PINPUT = 0 dBm, Z0 = 50 , unless otherwise noted
Parameter Insertion loss Frequency 0.5-3.0 GHz 3.0-4.5 GHz 4.5-6.0 GHz 0.5-4.0 GHz 4.0-6.0 GHz Return loss 0.5-3.5 GHz 3.5-6.0 GHz Min. Typ. 0.7 0.9 1.3 7 (0.2 + 3% of attenuation setting in dB) (0.3 + 3% of attenuation setting in dB) 15 15 Max. 0.9 1.1 1.5 Unit dB dB dB dB dB dB dB dB
Attenuation range Attenuation accuracy
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
200243 Rev. B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * June 27, 2006
1
PRELIMINARY DATA SHEET * SKY12325-350
Operating Characteristics at 25C
T = 25 C, ZO = 50 , unless otherwise noted
Parameter Input power for 1 dB compression Input third order intermodulation intercept Control voltages VDD = 3 V VDD = 5 V For two-tone input power 5 dBm, f = 1 MHz VLOW = 0 V, VHIGH = 3 V VLOW = 0 V, VHIGH = 5 V VLOW = 0 V to 0.8 V @ 50 A max. VHIGH = 3 V to VDD @ 50 A max. Condition Frequency 0.5-6.0 GHz 0.5-6.0 GHz 44 47 dBm dBm Min. Typ. 24 27 Max. Unit dBm dBm
Typical Performance Data
0 -0.2 -0.4 0 -1 -2 1 dB 2 dB 4 dB 7 dB
Insertion Loss (dB)
-0.6 -0.8 -1.0 -1.2 -1.4 -1.6 -1.8 -2.0 0 1 2 3 4 5 6
Attenuation (dB)
-3 -4 -5 -6 -7 -8 0 1 2 3 4 5 6
Frequency (GHz)
Insertion Loss vs. Frequency
Frequency (GHz)
Attenuation vs. Frequency, Normalized to Insertion Loss
7 dB 0 -5 -10 IL 1 dB 2 dB 4 dB 8 dB
1 dB 1.0 0.8 0.6
2 dB
4 dB
Attenuation Error (dB)
Return Loss (dB)
0 1 2 3 4 5 6
0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0
-15 -20 -25 -30 -35 -40 0 1 2 3 4 5 6
Frequency (GHz)
Frequency (GHz)
Attenuation Error vs. Frequency
Return Loss vs. Frequency
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 2
June 27, 2006 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * 200243 Rev. B
PRELIMINARY DATA SHEET * SKY12325-350
Absolute Maximum Ratings
Characteristic RF input power Supply voltage Control voltage Operating temperature Storage temperature Value 30 dBm 6V 0 V < VC < 6 V -40 C to +85 C -65 C to +150 C
Pin Out
VDD 16 N/C RF In/Out 1 2 V3 15 V2 14 V1 13 12 11 N/C RF In/Out
Performance is guaranteed only under the conditions listed in the specifications table and is not guaranteed under the full range(s) described by the Absolute Maximum specifications. Exceeding any of the absolute maximum/minimum specifications may result in permanent damage to the device and will void the warranty.
1 dB
2 dB
4 dB
N/C N/C
3 4 5
10 9
N/C N/C
CAUTION: Although this device is designed to be as robust as possible, ESD (Electrostatic Discharge) 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 must be employed at all times.
6 GND
7 GND
8 N/C
GND
Pin Descriptions
Pin Number 1, 3, 4, 8, 9, 10, 12 Pin Name N/C J2 Not connected RF Input/Output - RF input or output port, supply voltage input. External DC block required Equipotential Point - Equipotential points for control voltages and RF circuits. Must be connected to pcb ground via lowest possible impedance Control Voltage - High Impedance control voltage input for 4 dB weighted bit (MSB) Control Voltage - High Impedance control voltage input for 2 dB weighted bit Control Voltage - High Impedance control voltage input for 1 dB weighted bit (LSB) Supply Voltage - Supply voltage, 2.7 V < VDD < 5.5 V Description
Truth Table
V1 VLOW VLOW VLOW VLOW VHIGH VHIGH VHIGH VHIGH Control Voltage1 V2 VLOW VLOW VHIGH VHIGH VLOW VLOW VHIGH VHIGH V3 VLOW VHIGH VLOW VHIGH VLOW VHIGH VLOW VHIGH Attenuation (dB)2 7 6 5 4 3 2 1 0
2, 11
5, 6, 7
GND
13 14 15 16
V1 V2 V3 VDD
1. +2.7 V < VHIGH < +5.5 V, -0.2 < VLOW < +0.2 V. 2. Attenuation normalized to insertion loss
-350 (QFN 3 x 3)
0.118 (3.00 mm) Pin 1 Indicator 0.118 (3.00 mm) 0.008 (0.20 mm) Seating Plane 0.001 (0.02 mm)
Recommended Solder Reflow Profiles
Refer to the "Recommended Solder Reflow Profile" Application Note.
Tape and Reel Information
Refer to the "Discrete Devices and IC Switch/Attenuators Tape and Reel Package Orientation" Application Note.
0.067 (1.70 mm) 0.004 (0.10 mm) Exposed Pad 0.029 (0.73 mm)
0.030 (0.75 mm) 0.002 (0.05 mm)
0.059 (1.500 mm)
0.067 (1.70 mm) 0.004 (0.10 mm)
0.059 (1.500 mm)
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
200243 Rev. B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * June 27, 2006
3
PRELIMINARY DATA SHEET * SKY12325-350
Copyright (c) 2002, 2003, 2004, 2005, 2006, Skyworks Solutions, Inc. All Rights Reserved. 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.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 4
June 27, 2006 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * 200243 Rev. B

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