SKY33100-360LF

PRELIMINARY DATA SHEET SKY33100-360LF: BAW Band Pass Filter 2.4 GHz Applications G G 802.11 b/g/n Tx band 2.4 GHz ISM band Features G G G G G Bandwidth: 70 MHz Low mid-band insertion loss: 1 dB typical High near-band rejection Input and output impedance: 50 Ω nominal Lead (Pb)-free and RoHS-compliant QFN 8L 2 x 2 mm package Functional Block Diagram Description The SKY33100-360LF is a bulk acoustic wave (BAW) band pass filter in a QFN 8L 2 x 2 mm package. This filter has very low in-band insertion loss, excellent near-band rejection and very low input and output return loss. This filter is intended for use in the 2.4 GHz WLAN and ISM bands. The filter can operate over the temperature range of -40 to +85 °C. The SKY33100-360LF is available in a lead (Pb)-free, RoHS-compliant package. NEW Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances)-compliant packaging. Electrical Specifications T = 25 °C, PINPUT = 0 dBm, ZO = 50 Ω, unless otherwise noted Parameter Insertion loss Return loss Attenuation DC withstand voltage Pass band Pass band Lower stop band Upper stop band Condition Frequency 2.402–2.472 GHz 2.402–2.472 GHz 2.3900 GHz 2.4835 GHz 9 12 12 Min. Typ. 2 10 14 14 100 Max. 3 Unit dB dB dB dB V BUY NOW Innovation to GoTM Now available for purchase online. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 200627 Rev. D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2007 1 PRELIMINARY DATA SHEET • SKY33100-360LF Typical Performance Data T = 25 °C, PINPUT = 0 dBm, ZO = 50 Ω, unless otherwise noted 0 -5 -10 Input 0 -5 Output Insertion Loss (dB) Return Loss (dB) 2.2 2.3 2.4 2.5 2.6 2.7 -15 -20 -25 -30 -35 -40 -45 -50 -10 -15 -20 -25 -30 -35 -40 2.2 2.3 2.4 2.5 2.6 2.7 Frequency (GHz) Frequency (GHz) Insertion Loss vs. Frequency – Wide Band Return Loss vs. Frequency – Wide Band Input Output Bound 0 -2 -4 0 -5 Insertion Loss (dB) -6 -8 -10 -12 -14 -16 -18 -20 2.350 2.375 2.400 2.425 2.450 2.475 2.500 2.525 Return Loss (dB) -10 -15 -20 -25 -30 -35 -40 2.350 2.375 2.400 2.425 2.450 2.475 2.500 2.525 Frequency (GHz) Frequency (GHz) Insertion Loss vs. Frequency – Narrow Band Return Loss vs. Frequency – Narrow Band Pin Out (Bottom View) GND 1 GND 2 GND 3 GND 4 Land Pattern R 0.20 Pin 1 8X 0.25 Exposed Paddle Ground 8X 0.70 8X 0.45 0.50 Pitch 0.25 2X 0.85 8 RF In 7 GND 6 GND 5 RF Out Exposed Soldering Area Typ. 2X 0.45 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 August 10, 2007 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200627 Rev. D PRELIMINARY DATA SHEET • SKY33100-360LF Absolute Maximum Ratings Characteristic Input power Operating temperature Storage temperature ESD HBM Machine Model Value 33 dBm -40 °C to +85 °C -40 °C to +125 °C 1000 V 1500 V QFN 8L 2 x 2 mm Package 0.20 Ref. Seating Plane 2 Pin 1 Indicator 2 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. 0.90 ± 0.10 0.90 + 0.10 0.90 - 0.15 0.45 + 0.05 0.45 - 0.07 Exposed Pad 0.50 0.25 + 0.05 0.25 - 0.07 0.30 + 0.01 0.85 + 0.05 0.85 - 0.07 1.70 + 0.10 1.70 - 0.15 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. Recommended Solder Reflow Profiles Refer to the “Recommended Solder Reflow Profile” Application Note. Theory of Operation Bulk acoustic wave (BAW) filters make use of very low loss electromechanical resonators to perform very highly selective RF filtering. The typical configuration for a BAW filter is the ladder network, which contains series and shunt resonators with slightly differing resonant frequencies to form a band pass filter with steep near band rolloff. BAW resonators consist of a thin film layer of piezoelectric material sandwiched between two metal electrodes. These layers are formed on top of an acoustic mirror comprised of several alternating layers of high and low acoustic impedance materials, the composition and thickness of which are both very tightly controlled. Piezoelectric Layer Bottom Electrode Top Electrode Acoustic Mirror Layers Tape and Reel Information Refer to the “Discrete Devices and IC Switch/Attenuators Tape and Reel Package Orientation” Application Note. Part Marking (Top View) Silicon Substrate Simplified BAW Resonator Cross Section Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 200627 Rev. D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2007 3 PRELIMINARY DATA SHEET • SKY33100-360LF Electrical signals are coupled into the piezoelectric layer via the electrodes and due to the piezoelectricity, that layer changes dimension, primarily thickness. The longitudinal acoustic wave created is resonant in the layered structure and as such the frequency of operation is dictated by the layer thicknesses and acoustic properties of the layers used. The large currents that result at the acoustic resonance produce the sizeable impedance changes that are used in the design RF filters. The substrate on top of which the electrode-peizoelectric-electrode "sandwich" is formed is an important part of the BAW structure. Alternating layers of high and low acoustic impedance materials are deposited to a total thickness of about one fourth of the acoustic wavelength of the resonant frequency. These layers, known as the acoustic mirror or the Bragg Stack, act in a manner analogous to an electrical quarter-wave transmission line terminated in a short circuit. Construction of optimized acoustic reflections is vital to the low loss operation of BAW filters. A simplified electrical equivalent circuit of a single BAW resonator and its impedance versus frequency are shown below. BAW Ladder Network The construction of BAW resonators is similar to that of parallel plate capacitors. This geometry allows for very robust filters to be constructed, with tolerance of higher DC voltages and static discharges than those tolerated by typical SAW filters. BAW filter losses and temperature coefficients of frequency can also be lower than those of typical SAW filters so that more aggressive near band rejection requirements can be addressed. Evaluation Board |Impedance Frequency BAW Resonator Equivalent Circuit and Impedance vs. Frequency This structure produces a series resonance, fSERIES, as well as a parallel resonance, fPARALLEL. The spacing between resonance and antiresonance and the magnitude of the impedance excursions is determined by layer construction. A filter is formed by cascading series and shunt resonators in a ladder configuration. Simplistically one places the series low impedance and the shunt high impedance frequencies roughly mid band resulting in a band pass shape. The number of segments used is determined by required rejection and tolerable insertion loss. The impedance, band shape, and out of band rejection of the filter are determined by optimizing the properties of the various resonators. The evaluation board for the SKY33100-360LF BAW filter allows the part to be fully exercised and evaluated. Although the RF ports on the evaluation board are marked "Input" and "Output", the filter is actually fully bilateral, so either RF port can be utilized as the RF input or the RF output with no degradation in performance. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 4 August 10, 2007 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200627 Rev. D PRELIMINARY DATA SHEET • SKY33100-360LF Copyright © 2002, 2003, 2004, 2005, 2006, 2007, Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 200627 Rev. D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2007 5