DATA SHEET ATN3590 Series: Fixed Attenuators Applications x Level adjustment in radios, radars, EW/ECM equipment, and test instruments Features x Fixed value, absorptive devices x Available attenuation values range from 0 to 10 dB (in 1 dB steps), and 12, 15, 20, and 30 dB x Suitable for use to 40 GHz or higher x Excellent return loss: 30 dB, typical x Enhanced power handling: 2 W Out Back Side Back Side Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances) compliant packaging. In Schematic Figure 1. Typical Attenuator Die and Circuit Description The ATN3590 family of fixed resistive attenuators are integrated circuits comprising thin film resistors and through-die vias that provide excellent attenuation flatness from low frequency to 40 GHz or higher. These attenuators are available from 0 to 30 dB (see Table 2). The ATN3590 attenuator family is optimized for surface mounting on co-planar waveguide or microstrip printed circuit boards. Bond wires or ribbons are used to connect the input and output ports of the attenuators to the external circuit transmission lines. Connection to ground is accomplished by through-die vias to the die backside metallization. The dice are attached using eutectic solder or conductive epoxy and can operate over a temperature range of –65 qC to 150 qC. The absolute maximum ratings for the ATN3590 attenuators are provided in Table 1 and the electrical specifications are shown in Table 2. Typical performance characteristics are illustrated in Figures 2 through 8. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200842B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 2, 2009 1 DATA SHEET • ATN3590 SERIES FIXED ATTENUATORS Table 1. ATN3590 Series Absolute Maximum Ratings Parameter Symbol Minimum Typical Maximum Units 2 W Input power PIN Power dissipation @ 25 °C PDIS 2 W Operating temperature TOP –55 +150 qC Storage temperature TSTG –55 +150 qC 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. Table 2. ATN3590Series Electrical Specifications (Note 1) (TOP = +25 qC, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Part Number Attenuation Attenuation Attenuation Attenuation Min. Return Min. Return Min. Return Min. Return Attenuation Flatness Flatness Flatness Flatness Loss Loss Loss Loss Attenuation Tolerance (Note 2) (Note 2) (Note 2) (Note 2) DC–12 GHz 12–26 GHz 26–33 GHz 33–40 GHz @ DC (dB) DC–12 GHz 12–26 GHz 26–33 GHz 33–40 GHz (dB) (dB) (dB) (dB) (dB) (dB) (dB) (dB) (dB) ATN3590-00 0 0.25 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-01 1 ±0.20 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-02 2 ±0.20 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-03 3 ±0.20 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-04 4 ±0.20 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-05 5 ±0.20 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-06 6 ±0.40 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-07 7 ±0.40 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-08 8 ±0.40 ±0.15 ±0.15 ±0.20 ±0.20 28 24 20 16 ATN3590-09 9 ±0.40 ±0.20 ±0.20 ±0.25 ±0.30 28 24 20 16 ATN3590-10 10 ±0.40 ±0.20 ±0.20 ±0.25 ±0.50 28 24 20 16 ATN3590-12 12 ±0.40 ±0.20 ±0.20 ±0.30 ±0.50 28 24 20 16 ATN3590-15 15 ±0.40 ±0.20 ±0.20 ±0.50 ±0.75 28 24 20 16 ATN3590-20 20 ±1.0 ±0.20 ±0.20 ±0.75 ±1.00 28 24 20 16 ATN3590-30 30 ±1.0 ±0.20 ±0.25 ±0.75 ±2.50 28 24 20 16 Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: Flatness is defined as the maximum deviation from the mean value of attenuation over the specified frequency range. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 December 2, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200842B DATA SHEET • ATN3590 SERIES FIXED ATTENUATORS Typical Performance Characteristics (TOP = +25 qC, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted. Data Gathered Using Ground-to-Signal-to-Ground Probes on Die) +2.0 –2.0 0 dB 1 dB 2 dB +1.5 +1.0 –3.0 +0.5 0 Attenuation (dB) Attenuation (dB) 3 dB 4 dB 5 dB –2.5 –0.5 –1.0 –1.5 –2.0 –2.5 –3.5 –4.0 –4.5 –5.0 –3.0 –5.5 –3.5 –4.0 0 5 10 15 20 25 30 35 –6.0 40 0 5 10 15 Frequency (GHz) 20 25 30 35 40 35 40 Frequency (GHz) Figure 2. Attenuation vs Frequency (0 dB, 1 dB, and 2 dB Attenuators) Figure 3. Attenuation vs Frequency (3 dB, 4 dB, and 5 dB Attenuators) –5.0 –8 6 dB 7 dB 8 dB –5.5 –9 Attenuation (dB) Attenuation (dB) –6.0 –6.5 –7.0 –7.5 –10 –11 –12 –8.0 –9.0 9 dB 10 dB 12 dB –13 –8.5 0 5 10 15 20 25 30 35 40 Frequency (GHz) –14 0 5 10 15 20 25 30 Frequency (GHz) Figure 4. Attenuation vs Frequency (6 dB, 7 dB, and 8 dB Attenuators) Figure 5. Attenuation vs Frequency (9 dB, 10 dB, and 12 dB Attenuators) –14 –16 Attenuation (dB) –18 –20 –22 15 dB 20 dB 30 dB –24 –26 –28 –30 –32 0 5 10 15 20 25 30 35 40 Frequency (GHz) Figure 6. Attenuation vs Frequency (15 dB, 20 dB, and 30 dB Attenuators) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200842B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 2, 2009 3 DATA SHEET • ATN3590 SERIES FIXED ATTENUATORS 0 0 0 dB 6 dB 15 dB –10 1 dB 7 dB 20 dB 2 dB 8 dB 30 dB 3 dB 9 dB 4 dB 10 dB 5 dB 12 dB Small Signal Gain (dB) Input Return Loss (dB) 1 dB 7 dB 20 dB 2 dB 8 dB 30 dB 3 dB 9 dB 4 dB 10 dB 5 dB 12 dB –20 –20 –30 –40 –50 –30 –40 –50 –60 –60 –70 –70 –80 0 dB 6 dB 15 dB –10 0 5 10 15 20 25 30 35 40 –80 0 5 10 15 Frequency (GHz) Figure 7. Input Return Loss vs Frequency 20 25 30 35 40 Frequency (GHz) Figure 8. Small Signal Gain vs Frequency Technical Description The ATN3590 family of fixed attenuators comprises devices with nominal attenuation values of 0 to 10 dB (in 1 dB steps), and 12, 15, 20, and 30 dB. These attenuators contain through-wafer vias that connect the topside ground to the backside metallization of each die. The devices with nominal attenuation values of 1 dB or greater are fabricated using thin film resistors deposited on high resistivity silicon substrates. The circuit topology is a simple tee structure that consists of two series resistors and a shunt resistance, which in this case is realized as a pair of shunt resistors connected to the node between the two series resistors (refer to Figures 9 and 10). The resistances of each of these resistors are selected to simultaneously produce the nominal attenuation with very good input and output return losses. R3 R1 R4 R2 Figure 9. Circuit Topology (1 – 5 dB Attenuators) R1 The attenuators with nominal attenuation values ≥6 dB contain a pair of cascaded tee sections (see Figure 11). The 0 dB attenuator, ATN3590-00, is a 50 Ω microstrip transmission line with identical foot print and bond pads to those of the other products in this family. R4 R2 || R3 Figure 10. Simplified Circuit Topology (1 – 5 dB Attenuators) Die Attachment and Signal Path Connection Any of the ATN3590 family of attenuators should be mounted on the ground plane of a transmission medium. The die should be attached with conductive epoxy or a eutectic solder such as gold/tin (AuSn). For good high frequency performance, it is essential that there is no ground plane directly beneath the series signal path of the ATN3590. The backside metallization on the die is split into two regions along the sides of the die to accommodate this requirement. R3 R5 R1 R4 R2 R7 R6 Figure 11. Circuit Topology for Attenuators with Nominal Attenuation ≥6 dB Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 December 2, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200842B DATA SHEET • ATN3590 SERIES FIXED ATTENUATORS The metallization on the circuit medium to which the attenuator is to be mounted must also include the split in the ground connections. It is recommended that the gap between the ground pads on the circuit medium should be 250 μm wide by 900 μm long. Package Dimensions The input and output signal paths should be connected to the signal path bond pads on the attenuator with Au ribbons or wires. It is recommended that these connections be made with 0.25 x 3 mil (6.25 x 75 microns) ribbons, as shown in Figure 12. Packaging The PCB layout footprint for the ATN3590 attenuators is shown in Figure 13. Package dimensions are provided in Figure 14. The standard mode of packaging for shipment of the ATN3590 Attenuator Series is 100 pieces per GelPak™. 0.25 x 3 mil Au Ribbon (2 Places) Ground Input/Output Output/Input Ground Figure 12. Suggested Die Mount and Ribbon Attachment For best performance, no PCB topside ground metal should remain in this area (250 x 900 microns, centered on die) Ground metal (2 places) Figure 13. PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200842B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 2, 2009 5 DATA SHEET • ATN3590 SERIES FIXED ATTENUATORS 0.725 Additional Ground Contacts 0.110 x 0.075 (4 Places) 10DB Attenuator Value Ground Via to Backside (8 Places) Input/Output Pad 0.110 x 0.075 (2 Places) 0.700 0.100 Low Inductance Ground Contact (Cu-Ti/V-Au). Solder or Conductive Epoxy Attach. 0.152 Out Back Side Back Side In Schematic Notes: 1. Resistor Configuration on Top Side of Die Varies by Attenuation Value of Device. 2. All measurements in millimeters 3. All dimensions ± 0.025 mm S1603 Figure 14. ATN3590 Attenuator Series Die Dimensions Copyright © 2009 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. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 December 2, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200842B