DATA SHEET SKY12340-364LF: 300 kHz – 2.0 GHz Five-Bit Digital Attenuator with Serial-to-Parallel Driver Applications VSS Features DATA_OUT DATA_IN Single, +5 V DC supply voltage Integrated silicon serial-to-parallel driver Attenuation: 0.5 dB steps to 15.5 dB Small, QFN (32-pin, 5 x 5 mm) Pb-free package (MSL1, 260 C per JEDEC J-STD-020) RF2 LATCH CLK_IN 8 dB Serial-To-Parallel Driver Cellular infrastructure Wireless receivers VDD 4 dB 2 dB 1 dB 0.5 dB RESET RF1 S1591 Figure 1. SKY12340-364LF Block Diagram Description The SKY12340-364LF is a GaAs FET five-bit digital attenuator I/C with a serial-to-parallel driver. The device is provided in a 5 x 5 mm, 32-pin Quad Flat No-Lead (QFN) package. The SKY12340-364LF is particularly suited at IF frequencies for which high attenuation accuracy, low insertion loss, and low intermodulation products are required. 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010 1 VDD C1 C2 GND VSS CLK_IN DATA_IN LATCH DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR 32 31 30 29 28 27 26 25 GND 3 22 GND GND 4 21 GND RF1 5 20 RF2 GND 6 19 GND GND 7 18 GND GND 8 17 GND 9 10 11 12 13 14 15 16 GND GND GND 23 GND 2 GND GND GND RESET GND 24 GND 1 GND DATA_OUT S1584 Figure 2. SKY12340-364LF Pinout – 32-Pin QFN (Top View) Table 1. SKY12340-364LF Signal Descriptions Pin # Name Description Pin # Name Description 1 DATA_OUT Serial data output 17 GND Ground 2 GND Ground 18 GND Ground 3 GND Ground 19 GND Ground 4 GND Ground 20 RF2 RF input/output 5 RF1 RF input/output 21 GND Ground 6 GND Ground 22 GND Ground 7 GND Ground 23 GND Ground 8 GND Ground 24 RESET Reset 9 GND Ground 25 LATCH Latch enable 10 GND Ground 26 DATA_IN Serial data input 11 GND Ground 27 CLK_IN Serial clock input 12 GND Ground 28 VSS Low output voltage level 13 GND Ground 29 GND Ground 14 GND Ground 30 C2 Charge pump capacitor 2 15 GND Ground 31 C1 Charge pump capacitor 1 16 GND Ground 32 VDD Supply voltage Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 January 5, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201111B DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR Functional Description changes states on the rising edge of the latch-enable (LE) signal, according to the most recent five bits of shifted data accepted since the previous falling edge of the LE signal. Refer to the timing diagram in Figure 3 and timing parameter specifications in Table 2. The SKY12340-364LF is a five bit digital attenuator comprised of a GaAs attenuator and a silicon CMOS driver. The attenuation setting is controlled by a serial-to-parallel interface. Attenuation is set by a stream of data that is clocked into the shift registers of the silicon chip by the clock signal. Power-up sequence is as follows: 0. Connect ground To set the attenuation state, a latch signal is sent to the appropriate pin to send the correct bias voltages to the GaAs attenuator. The silicon chip generates a negative voltage using a negative voltage generator that requires two external components: a charge pump capacitor connected between pins 30 (C2) and 31 (C1) and a voltage hold capacitor connected from pin 28 (VSS) to ground. 1. Apply VDD 2. Set all inputs (SCK, SDA, LE) The power-down sequence is the reverse of above. Electrical and Mechanical Specifications More than one attenuator can be cascaded together and the data may be passed through one device to the other using the DATA_OUT signal (pin 1). To reset the attenuator to the insertion loss state, a logic low signal may be sent to the reset pin. DC bias voltage to the silicon CMOS chip is applied to pin 32 (VDD). The absolute maximum ratings of the SKY12340-364LF are provided in Table 3. Electrical specifications are provided in Tables 4 and 5. Typical performance characteristics of the SKY12340-364LF are illustrated in Figures 4 through 10. Power-Up/Power-Down Timing The state of the SKY12340-364LF is determined by the logic provided in Table 6. Serial data (SDA) is shifted into the register on the rising edge of the clock (SCK), least significant bit (LSB) first. The attenuator Data Feedthrough LE T4 T1 SCK SDA T2 T3 T5 S1594 Figure 3. Power-Up/Power-Down Timing Table 2. Power-Up/Power-Down Timing Parameters Parameter Minimum Typical T1 7.5 15 SDA setup time T2 7.5 15 ns SDA hold time T3 5 10 ns LE hold time T4 5 10 Clock frequency fCLK 16 Clock period T5 1/fCLK LE setup time Symbol Maximum Units ns ns 100 MHz Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010 3 DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR Table 3. SKY12340-364LF Absolute Maximum Ratings Parameter Symbol Minimum Typical Maximum Units –0.5 +6.0 V –0.5 – VDD +0.5 V +25 dBm Supply voltage VDD Input voltage VI RF input power PIN Storage temperature TSTG –65 +150 C Operating temperature TOP –40 +85 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. Table 4. SKY12340-364LF Electrical Specifications (Note 1) (TOP = +25 C, Characteristic Impedance [ZO] = 50 Ω, VDD = 5 V, Unless Otherwise Noted) Parameter Insertion loss (Note 2) Symbol IL Test Condition Min Typical Max Units 300 kHz to 1.0 GHz 1.4 1.5 dB 300 kHz to 2.0 GHz 1.8 2.0 dB Attenuation range (Note 3) 15.5 Attenuation accuracy (Note 3) Return loss 300 kHz to 2.0 GHz |S11| Switching characteristics: Rise, fall On, off Video feedthrough 1 dB input compression point 300 kHz to 2.0 GHz 20 dB 50 100 50 ns ns mV +27 +26 +30 +30 dBm dBm Insertion loss state: 0.05 GHz 0.5 to 2.0 GHz +43 +47 +45 +50 dBm dBm Attenuation states: 0.05 GHz 0.5 to 2.0 GHz +41 +47 +45 +50 dBm dBm 1.7 0 3.5 0.3 Insertion loss state 0.5 to 2.0 GHz 0.05 GHz 3rd Order Intercept Point 12 10/90% or 90/10% RF 50% control to 90/10% RF TRISE = 1 ns, bandwidth = 500 MHz IP1dB IP3 dB ±(0.35 + 2% of attenuation setting in dB) 1 MHz spacing, PIN = +5 dBm/tone Input voltage: High Low VH VL Input leakage current IL ±0.5 μA Quiescent current IDD 500 μA Supply voltage VDD 5 V 5.0 0.6 Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: Insertion loss changes by 0.003 dB/°C. Note 3: Attenuation value referenced above insertion loss. Exposed pad must be connected to RF ground to obtain specified attenuation. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 January 5, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201111B V V DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (TOP = +25 C, Characteristic Impedance [ZO] = 50 Ω, VDD = 5 V, Unless Otherwise Noted) +0.5 0 –40 °C +25 °C +85 °C Inseriton Loss (dB) –0.4 0.5 dB 1.0 dB 2.0 dB +0.4 +0.3 Attenuation Error (dB) –0.2 –0.6 –0.8 –1.0 –1.2 –1.4 +0.2 +0.1 0 –0.1 –0.2 –1.6 –0.3 –1.8 –0.4 –0.5 –2.0 0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0 0.25 0.50 0.75 1.25 1.50 1.75 2.00 1.75 2.00 Figure 5. Attenuation Error vs Frequency (0.5, 1.0, and 2.0 dB States) Figure 4. Insertion Loss vs Frequency 20 Attenuation Relative Phase (Degrees) +0.5 4.0 dB 8.0 dB 15.5 dB +0.4 +0.3 Attenuation Error (dB) 1.00 Frequency (GHz) Frequency (GHz) +0.2 +0.1 0 –0.1 –0.2 –0.3 –0.4 0.5 dB 1.0 dB 2.0 dB 18 16 14 12 10 8 6 4 2 0 –0.5 0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 0 2.00 0.25 0.50 0.75 1.00 1.25 1.50 Frequency (GHz) Frequency (GHz) Figure 7. Attenuation Relative Phase vs Frequency, Normalized to Insertion Loss (0.5, 1.0, and 2.0 dB States) Figure 6. Attenuation Error vs Frequency (4.0, 8.0, and 15.5 dB States) 4.0 dB 8.0 dB 15.5 dB 18 16 +0.5 50 MHz 100 MHz 500 MHz +0.4 14 Attenuation Error (dB) Attenuation Relative Phase (Degrees) 20 12 10 8 6 4 2 +0.3 +0.2 +0.1 0 –0.1 –0.2 –0.3 –0.4 0 0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 Frequency (GHz) Figure 8. Attenuation Relative Phase vs Frequency, Normalized to Insertion Loss (4.0, 8.0, and 15.5 dB States) 2.00 –0.5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Attenuation State (dB) Figure 9. Attenuation Error vs Attenuation State (@ 50, 100, and 500 MHz) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010 5 DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR 0 +0.4 –0.1 +0.3 –0.2 Attenuation Step (dB) Attenuation Error (dB) +0.5 +0.2 +0.1 0 –0.1 –0.2 1000 MHz 1500 MHz 2000 MHz –0.3 –0.4 –0.3 –0.4 –0.5 –0.6 –0.7 –0.8 –0.9 –1.0 –0.5 0 1 2 3 4 5 6 7 8 9 10 11 12 50 MHz 100 MHz 500 MHz 13 14 15 16 0 1 2 3 4 5 0 8 9 10 11 –0.2 –0.4 –0.5 –0.6 –0.7 –10 15 –20 –25 –30 –35 –40 –0.9 –45 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 –50 0 1 2 3 4 5 6 7 8 9 10 11 1000 MHz 1500 MHz 2000 MHz –10 –15 –20 –25 –30 –35 –40 –45 1 2 3 4 5 6 7 8 9 13 Figure 13. Return Loss vs Attenuation State (@ 50, 100, and 500 MHz) 0 –5 0 12 Attenuation State (dB) Figure 12. Attenuation Step vs Attenuation State (@ 1000, 1500, and 2000 MHz) Return Loss (dB) 14 –15 –0.8 Attenuation State (dB) 10 11 12 13 14 15 Attenuation State (dB) Figure 14. Return Loss vs Attenuation State (@ 1000, 1500, and 2000 MHz) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 13 50 MHz 100 MHz 500 MHz –5 Return Loss (dB) –0.3 –50 12 0 1000 MHz 1500 MHz 2000 MHz –0.1 Attenuation Step (dB) 7 Figure 11. Attenuation Step vs Attenuation State (@ 50, 100, and 500 MHz) Figure 10. Attenuation Error vs Attenuation State (@ 1000, 1500, and 2000 MHz) –1.0 6 Attenuation State (dB) Attenuation State (dB) January 5, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201111B 14 15 DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR Table 6. SKY12340-364LF Truth Table J1 to J2 Attenuation Serial Data Input Reset 0.5 dB 1.0 dB 2.0 dB 4.0 dB 8.0 dB Insertion loss 1 0 0 0 0 0 0.5 dB 1 1 0 0 0 0 1.0 dB 1 0 1 0 0 0 2.0 dB 1 0 0 1 0 0 4.0 dB 1 0 0 0 1 0 8.0 dB 1 0 0 0 0 1 15.5 dB 1 1 1 1 1 1 Insertion loss 0 X X X X X Note: “1” = VH = +1.7 V to +5 V. “0” = VL = 0 to +0.6 V. “X” = don’t care. This Table shows the logic required for the major bits and full attenuation. Bit states need to be used in combination to set the sum of the bits selected. Evaluation Board Description Package and Handling Information The SKY12340-364LF Evaluation Board is used to test the performance of the SKY12340-364LF digital attenuator. An assembly drawing for the Evaluation Board is shown in Figure 15 and an Evaluation Board schematic diagram is shown in Figure 16. Table 7 provides the Evaluation Board Bill of Materials (BOM) list. 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 Evaluation Board includes the required charge pump capacitor between pins 30 and 31. It also includes the negative voltage holding capacitor required from pin 28 to ground. A capacitor is added to pin 31 to ground any noise on the DC supply line. Package Dimensions The PCB layout footprint for the SKY12340-364LF is shown in Figure 17. Typical case markings are noted in Figure 18. Package dimensions for the 32-pin QFN are shown in Figure 19, and tape and reel dimensions are provided in Figure 20. The SKY12340-364LF 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. For packaging details, refer to the Skyworks Application Note, Discrete Devices and IC Switch/Attenuators Tape and Reel Package Orientation, document number 200083. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010 7 DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR 1 RF2 C2 RF1 C1 SDO VDD CLK SDI LE RST C3 S1593 Figure 15. SKY12340-364LF Evaluation Board Assembly Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 January 5, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201111B DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR C2 Clock C1 Data Input Supply Voltage (+5 V) Latch Enable C3 CLK_IN 1 Serial Data Output 26 DATA_OUT 25 LATCH 27 DATA_IN 28 VSS 29 GND C1 30 C2 31 VDD 32 24 RESET GND GND GND GND GND GND RF1 RF2 3 4 5 RF In/Out 9 10 11 12 13 14 21 20 RF In/Out 15 18 17 GND GND GND GND GND GND GND GND GND GND GND GND GND GND 8 22 19 6 7 Reset (+5 V) 23 2 16 NOTE: Exposed bottom pad must be grounded S1592 Figure 16. SKY12340-364LF Evaluation Board Schematic Diagram Table 7. Recommended Evaluation Board Bill of Materials Component Value Size Manufacturer C1 0.025 μF 0402 Murata C2 0.01 μF 0402 Murata C3 0.01 μF 0402 Murata Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010 9 DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR Pin 32 R0.30 (Pin 1 Indicator) 2X 1.575 32X Exposed Solder Area – See Detail A Pin 1 16X 2.100 0.250 Typ. CL 2X 1.575 0.50 Pitch See Detail A CL Exposed Solderable Area – Ground Pad Package Outline 16X 2.100 0.55 Solderable Area Through-View From Top 0.25 Detail A 32X Scale = 48X S1608 All measurements are in millimeters Figure 17. SKY12340-364LF PCB Layout Footprint Pin 1 Indicator Skyworks Part # Lot # Date Code: (Y = Calendar Year WW = Week) Figure 18. Typical Part Markings Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 January 5, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201111B DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR C 5.0 3.15 +0.10/–0.15 Seating Plane 0.20 Ref. A B Pin 1 Indicator 0.02 +0.03/–0.02 Pin 1 Ind. R0.30 Exposed Pad 5.0 3.15 +0.10/–0.15 –B– 1.575 +0.05/–0.075 0.15 C 2X 32X 2X 3 Detail A 0.08 C 0.15 C Detail B 0.90/0.10 –A– 0.10 C Top View Side View Bottom View R0.30 Typ. CL 0.40 ± 0.10 Datum A or B 0.25 +0.05/–0.07 0.25 0.10 M C A B 0.05 M C 0.5 Detail B Detail C Scale: 20X Scale: 40X 32 Places All measurements are in millimeters. Dimensioning and tolerancing according to ASME Y14.5M-1994. Coplanarity applies to the exposed heat sink slug as well as the terminals.. Plating requirement per source control drawing (SCD) 2504. S1583 Figure 19. SKY12340-364LF 32-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010 11 DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR 4.00 ± 0.10 Pin #1 2.00 ± 0.05 B 1.75 ± 0.10 A 5.50 ± 0.05 5.25 (Bo) R0.3 Max. A 12.00 ± 0.30 0.30 ± 0.05 (T) ∅1.50 + 0.1/–0.0 8.00 ± 0.10 B 1.10 (Ko) 5.25 (Ao) R0.25 Typ. B A ∅1.50 Min. R0.3 Max. Notes: 1. Carrier tape: black conductive polystyrene, non-bakeable material. 2. Cover tape material: transparent conductive HSA. 3. Cover tape size: 9.20 mm width. 4. All measurements are in millimeters. S1602 Figure 20. SKY12340-364LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 January 5, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201111B DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12340-364LF Digital Attenuator Manufacturing Part Number SKY12340-364LF (Pb-free package) Evaluation Board Part Numbers EN31-D305-001, rev. A Copyright © 2009, 2010 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. 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