RFSA2644 RFSA2644 Serial Controlled Digital Step Attenuator SERIAL CONTROLLED DIGITAL STEP ATTENUATOR 50MHz TO 4000MHz, 6-BIT, 0.5dB LSB Single Supply, 3V to 5V Operation Footprint Compatible with Most 24-Pin, 4mm x 4mm, QFNs Transceiver RF and IF Applications Cellular, PCS, GSM, UMTS, LTE, WiMax/WiFi NC LE CLK PUP NC 15 RF2 GND 5 14 GND GND 6 13 GND 6-Bit DSA On-Chip ESD Protection Class 1C HBM Applications 4 7 8 9 10 11 12 GND Power-up Programming Modes RF1 SPI GND GND GND Serial Programming Interface 16 6-Bits, 31.5dB Range, 0.5dB Step 3 2 Serial-to-Parallel Controller GND VDD 17 Frequency Range 50MHz to 4000MHz 3V and 5V Logic Compatible 19 GND 1 20 18 GND High Linearity, IP3 >48dBm 21 GND 22 GND 23 GND 24 GND Features DATA Package: MCM, 24-Pin, 4.2mm x 4.2mm Functional Block Diagram Product Description RFMD’s RFSA2644 is a 6-bit digital step attenuator (DSA) that features high linearity over the entire 31.5dB gain control range with excellent step accuracy in 0.5dB steps. The RFSA2644 is programmed via a serial mode control interface that is both 3V and 5V compatible. The RFSA2644 also offers a rugged Class 1C HBM ESD rating via on-chip ESD circuitry. The MCM package is footprint compatible with most 24-pin, 4mm x 4mm, QFN packages. Wireless Data, Satellite Terminals Test Equipment Ordering Information RFSA2644SR RFSA2644SQ RFSA2644TR7 RFSA2644TR13 RFSA2644PCK-410 7” Sample reel with 100 pieces 25-Piece sample bag 7” Reel with 750 pieces 13” Reel with 2500 pieces 50MHz to 4000MHz PCBA with 5-piece sample bag Optimum Technology Matching® Applied GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS GaN HEMT BiFET HBT Si BJT RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2012, RF Micro Devices, Inc. DS120706 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 1 of 12 RFSA2644 Absolute Maximum Ratings Parameter Supply Voltage Rating Unit +5.5 V DC Supply Current 15 mA Power Dissipation 83 mW 28.3 dBm Operating Temperature (TCASE) -40 to +85 °C Storage Temperature -40 to +150 °C Junction Temperature 150 °C Class 1C V Max RF Input Power ESD Rating (HBM) Moisture Sensitivity Level Parameter Frequency Range Caution! ESD sensitive device. Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of Absolute Maximum Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied. The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice. RFMD Green: RoHS compliant per EU Directive 2002/95/EC, halogen free per IEC 61249-2-21, < 1000ppm each of antimony trioxide in polymeric materials and red phosphorus as a flame retardant, and <2% antimony in solder. MSL3 Min. Specification Typ. 50 Insertion Loss Max. 4000 Unit MHz 5V, 25°C unless otherwise stated 0.6 dB 50MHz, 0dB attenuation 0.7 dB 500MHz, 0dB attenuation 0.8 dB 880MHz, 0dB attenuation 1.2 dB 2140MHz, 0dB attenuation 1.8 dB 4000MHz, 0dB attenuation 31.5 dB 0.5dB step size ±(0.1+5% attenuation range) dB 1.4 Gain Control Range Step Accuracy Condition 2700MHz, 0dB attenuation Input IP3 48 55 dBm Input P0.5dB 20 20.2 dBm Under 100MHz, all states 28 30 dBm 150MHz to 1000MHz, all states 13 29 dBm Under 2700MHz 10 18 dBm 2700MHz to 4000MHz Input Return Loss Output Return Loss 13 27 dBm Under 2700MHz 11.5 22 dBm 2700MHz to 4000MHz Control Interface 6-Bit, Serial Settling Time Switching Speed Supply Voltage (VDD) Supply Current Control Voltage (VCTL) Serial interface 200 200 4.75 5.0 5.25 nS tRISE, tFALL (10%/90% RF) nS tON, tOFF (50% CTL to 10%/90% RF) V 5.2 mA Low, VCTL = 0 to 0.8V V High, VCTL = 2.0 to VDD V Notes: 1. VDD = 5V, VCTL = 5V, T = 25°C 2. IIP3 measured with PIN = 17dBm/tone, 1MHz spacing 2 of 12 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS120706 RFSA2644 Parameter Frequency Range Min. Specification Typ. 50 Insertion Loss Max. 4000 Unit MHz 3V, 25°C unless otherwise stated 0.7 dB 50MHz, 0dB attenuation 0.7 dB 500MHz, 0dB attenuation 1.0 dB 880MHz, 0dB attenuation 1.2 dB 2140MHz, 0dB attenuation dB 4000MHz, 0dB attenuation 31.5 dB 0.5dB step size ±(0.1 + 5% attenuation range) dB 1.5 2700MHz, 0dB attenuation 1.8 Gain Control Range Step Accuracy Condition Input IP3 48 dBm Input P0.5dB 20 dBm Under 100MHz, all states 27 dBm 1000MHz, all states Input Return Loss Output Return Loss Control Interface Control Voltage (VCTL) Under 2700MHz dBm 2700MHz to 4000MHz 13 dBm Under 2700MHz 11 dBm 2700MHz to 4000MHz Serial interface 200 Switching Speed Supply Current dBm 10 6-Bit, Serial Settling Time Supply Voltage (VDD) 13 200 2.8 3.0 5.0 3.3 nS tRISE, tFALL (10%/90% RF) nS tON, tOFF (50% CTL to 10%/90% RF) V mA Low, VCTL = 0 to 0.8V V High, VCTL = 2.0 to VDD V Notes: 1. VDD = 3V, VCTL = 3V, T = 25°C 2. IIP3 measured with PIN = 17dBm/tone, 1MHz spacing DS120706 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 3 of 12 RFSA2644 Typical Performance at 5V VDD - Broadband Application Circuit Insertion Loss versus Frequency Normalized Attenuation versus Frequency 0 2.5 -5 2.0 Attenuation (dB) Insertion Loss (dB) -10 1.5 1.0 -40°C -15 -20 -25 2 8 16 -30 85°C 0.0 -35 0 1,000 2,000 3,000 0 4,000 1000 Frequency (MHz) 2000 3000 4000 Frequency (MHz) Input Return Loss versus Frequency Output Return Loss versus Frequency 45 50 40 45 40 Output Return Loss (dB) 35 Input Return Loss (dB) 1 4 31.5 25°C 0.5 0.5 30 25 20 15 10 5 0dB 0.5dB 1dB 2dB 4dB 8dB 16dB 31.5dB 35 30 25 20 15 10 5 0 0dB 0.5dB 1dB 2dB 4dB 8dB 16dB 31.5dB 0 0 1000 2000 3000 4000 0 1000 Frequency (MHz) 2000 3000 4000 Frequency (MHz) Relative Phase versus Frequency Worst Case Step Error Between Successive States 60 1.00 40 0.5dB 1dB 2dB 4dB 8dB 16dB 0.75 Worst Case Step Error (dB) Relative Phase (Deg) 50 31.5dB 30 20 10 0 0.25 0.00 -0.25 -0.50 -0.75 -10 -1.00 0 1000 2000 Frequency (MHz) 4 of 12 0.50 3000 4000 0 1000 2000 3000 4000 Frequency (MHz) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS120706 RFSA2644 Typical Performance at 5V VDD - Broadband Application Circuit Major Step Error Versus Frequency Step Error versus Attenuation 1.00 1.0 0.75 0.5dB 1dB 2dB 4dB 8dB 16dB 0.8 0.6 50MHz 400MHz 1000MHz 2000MHz 3000MHz 4000MHz 31.5dB 0.50 0.25 Step Error (dB) Step Error (dB) 0.4 0.00 -0.25 0.2 0.0 -0.2 -0.4 -0.50 -0.6 -0.75 -0.8 -1.00 -1.0 0 1000 2000 4000 3000 0 4 8 12 Frequency (MHz) Input IP3 versus Frequency 16 20 Attenuation (dB) 24 28 32 Input P0.5dB versus Frequency 35 60 55 Input P0.5dB (dB) Input IP3 (dBm) 30 50 45 40 35 0dB 0.5dB 1dB 2dB 4dB 8dB 16dB 31.5dB 25 20 30 0dB 0.5dB 1dB 2dB 4dB 8dB 16dB 31.5dB 15 0 500 1000 1500 Frequency (MHz) DS120706 2000 2500 3000 0 100 200 300 400 500 600 700 800 900 1000 Frequency (MHz) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 5 of 12 RFSA2644 RFS 264 Serial Port Interface SPI Timing Diagram Programming Example - 6-Bit SPI Ti ing Diagra t6 t1 t2 t3 t4 t8 t5 CLK DATA t7 LE t9 DOUT t 10 Truth Table Control Bit C16 C8 C4 C2 C1 C0.5 Relative Gain Setting 1 1 1 1 1 1 Max gain 1 1 1 1 1 0 -0.5dB 1 1 1 1 0 1 -1dB 1 1 1 0 1 1 -2dB 1 1 0 1 1 1 -4dB 1 0 1 1 1 1 -8dB 0 1 1 1 1 1 -16dB 0 0 0 0 0 0 -31.5dB SPI Timing Diagram Specifications Parameter Limit Unit Comment t1 25 MHz max CLK Frequency State Logic t2 20 ns min CLK High Low 0V to 0.8V t3 20 ns min CLK Low High 2.0V to 5.0V t4 5 ns min DATA to CLK Setup Time t5 5 ns min DATA to CLK Hold Time t6 30 ns min Data Valid PUP Attenuator Setting t7 5 ns min LE to CLK Setup Time Low Attenuation at max, 31.5dB t8 5 ns min CLK to LE Setup Time High Attenuation at min, 0dB t9 10 ns min LE Pulse Width t10 20 ns max Output Set 6 of 12 Logic Voltage Levels Power-up Programming Truth Table 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS120706 RFSA2644 Evaluation Board Schematic C19 J100 SMA C20 1 2 1 2 J99 SMA GND GND C4/CLK C4 C2/LE C3 GND C5 C025 GND P1 C8/PUP C2 C1 GND VDD GND C025 C05/DATA C1 C2/LE C4/CLK C8/PUP C16 GND C05/DATA C6 C16 C1 R3 R2 R1 R5 R4 GND R6 GND C025 C4/CLK C1 1 2 3 4 5 6 7 8 9 C05/DATA GND C8/PUP C16 CON9 C9 C2/LE 1 2 3 4 5 6 7 8 9 10 11 GND GND/NC GND C14 GND C17 RTS# CB1 VIO VCC RXD RST RI# 3V3 GND CB3 DSR# PU1 DCD# PU2 CTS# VCC CB4 USB CB2 SLD 24 23 22 21 20 19 18 17 16 15 14 13 NC 18 17 16 GND C12 1 15 14 GND J2 RF2 2 RF2 GND/NC NC CB0 C16 19 20 C8 C4 21 22 C2 C1 RF1 GND/NC 6 GND/NC GND/NC 5 GND/NC 7 GND GND C18 GND DTR# 13 GND C13 12 2 4 GND/NC GND/NC 1 VDD 11 GND C11 J1 RF1 3 GND/NC GND/NC GND TXD UM232R C0.25 10 2 GND/NC 1 9 GND C7 GND/NC C8 U1 C0.5 R8 VDD 24 R7 8 GND 23 12 P2 GND C15 GND GND C16 GND DS120706 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 7 of 12 RFSA2644 Evaluation Board Bill of Materials (BOM) Description Reference Designator 50MHz to 4000MHz Serial 6-Bit DSA 0.5dB Step U1 RFMD RFSA2644SB CAP, 1000pF, 10%, 50V, X7R, 0402 C7 Taiyo Yuden (USA), Inc. RM UMK105BJ102KV-F RFSA2714410(A) CAP, 470pF, 10%, 50V, X7R, 0402 Manufacturer Manufacturer’s P/N Dynamic Details (DDI) Toronto SA2714410(A) C11-C12 Murata Electronics GRM155R71H471KA01E J1-J2, J99-J100 Molex SD-73251-4000 CONN, HDR, ST, PLRZD, 9-PIN P1 ITW Pancon MPSS100-9-C CONN, SKT, 24-PIN DIP, .600", T/H P2 Aries Electronics Inc. 24-6518-10 M1 (See Note Below) Future Technology Devices Int'l UM232R CONN, SMA, END LNCH, UNIV, HYB MNT, FLT MOD, USB TO SERIAL UART, SSOP-28 RES, 0Ω, 0402 R1-R2, R4-R5, R8 Kamaya, Inc RMC1/16SJPTH DNP C1-C6, C8-C9, C13, C18C20 NA NA DNP R3, R6-R7 NA NA Note: M1 is to be mounted into P2 with respect to the Pin 1 alignment of M1 and P2 8 of 12 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS120706 RFSA2644 Pin Names and Descriptions Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name GND VDD GND RF1 GND GND GND GND GND GND GND GND GND GND RF2 GND GND GND NC PUP 21 22 23 24 EPAD CLK LE NC DATA GND DS120706 Description Connect to Low Inductance Path to Ground. Power Supply. Connect to Low Inductance Path to Ground. RF Port; External DC Block Required. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. RF Port; External DC Block Required. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. Connect to Low Inductance Path to Ground. No Internal Connection; EVB Can Be Ground or No Connect. Power-up Programming Pin. Low = Max Attenuation (31.5dB) at Power-up. High = Min Attenuation (0dB) at Power-up. Serial Clock. Latch Enable. No Internal Connection; EVB Can Be Ground or No Connect. Serial Data. DC and RF Ground; Must be Soldered to EVB Ground Plane Over a Bed of Vias for Thermal and RF Performance. 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 9 of 12 RFSA2644 Evaluation Board Assembly Drawing 10 of 12 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS120706 RFSA2644 Package Outline Drawing DS120706 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 11 of 12 RFSA2644 IO Pattern Label Branding Diagram Dimensions in millimeters Refer to drawing posted at www.rfmd.com for tolerances 12 of 12 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS120706