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 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. Figure 2. SKY12325-350LF Pinout – 16-Pin QFN (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • 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 THREE-BIT DIGITAL ATTENUATOR Table 1. SKY12325-350LF Signal Descriptions Pin # 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) N/C No connection 16 VDD Supply voltage 8 Note: Name Exposed paddle must be grounded. Table 2. SKY12325-350LF Absolute Maximum Ratings Maximum Units RF input power Parameter 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: Symbol Minimum 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. The state of the SKY12325-350LF is determined by the logic provided in Table 4. Typical performance characteristics of the SKY12325-350LF are illustrated in Figures 3 through 6. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 April 22, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200423D DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR 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 Insertion loss IL Attenuation ATTN Attenuation accuracy Test Condition Min 0.5 to 3.0 GHz 3.0 to 4.5 GHz 4.5 to 6.0 GHz Typical Max Units 0.7 0.9 1.3 0.9 1.1 1.5 dB dB dB 7 dB 0.5 to 4.0 GHz ±(0.2 + 3% of attenuation setting) dB 4.0 to 6.0 GHz ±(0.3 + 3% of attenuation setting) dB Return loss RL 0.5 to 3.5 GHz 3.5 to 6.0 GHz 15 15 dB dB 1 dB Input Compression Point IP1dB 0.5 to 6.0 GHz +24 +27 dBm dBm +44 +47 dBm dBm VDD = 3 V VDD = 5 V 3rd Order Input Intercept Point IIP3 0.5 to 6.0 GHz, for twotone input power, +5 dBm/tone, Δf = 1 MHz VLOW = 0 V, VHIGH = 3 V VLOW = 0 V, VHIGH = 5 V Control voltage: High Low VCTL_H VCTL_L Control port current ICTL Supply voltage VS VDD – 0.2 0 VCTL_L VCTL_H 2.7 VDD + 0.2 0.8 V V 50 50 μA μA 5.5 V Note 1: Performance is guaranteed only under the conditions listed in this Table. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 3 DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VDD = 5 V, TOP = +25 °C, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Figure 3. Insertion Loss vs Frequency Figure 4. Attenuation vs Frequency (Normalized to Insertion Loss) Figure 5. Attenuation Error vs Frequency Figure 6. Return Loss vs Frequency Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 April 22, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200423D DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR Table 4. SKY12325-350LF Truth Table Attenuation (Note 1) (dB) V1 (Pin 13) V2 (Pin 14) V3 (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 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. 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. Figure 7. SKY12325-350LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 5 DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR Figure 8. Typical Part Markings Figure 9. SKY12325-350LF 16-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 April 22, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200423D DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR Figure 10. SKY12325-350LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200423D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 22, 2011 7 DATA SHEET • SKY12325-350LF THREE-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12325-350LF Digital Attenuator Manufacturing Part Number SKY12325-350LF Evaluation Board Part Numbers SKY12325-350LF-EVB Copyright © 2006, 2011 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 April 22, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200423D