RFSA2624 RFSA2624 Serial Controlled Digital Step AttenuatoR 50MHz to 4000MHz, 6Bit, 0.5dB LSB SERIAL CONTROLLED DIGITAL STEP ATTENUATOR 50MHz to 4000MHz, 6-BIT, 0.5dB LSB Package: MCM, 24-Pin, 4.2mmx4.2mm Features Frequency Range 50MHz to 4000MHz 6-Bits, 31.5dB Range, 0.5dB Step High Linearity, OIP3>48dBm through over 700MHz to 2700MHz 3V and 5V Logic Compatible Serial-to-Parallel Controller Serial Programming Interface Power-up Programming Modes On-chip ESD Protection >500V HBM Single Supply, 3V to 5V Operation Footprint compatible with most 24-pin, 4mm QFNs Applications Transceiver IF Applications Functional Block Diagram Product Description RFMD’s RFSA2624 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 RFSA2624 is programmed via a serial mode control interface that is both 3V and 5V compatible. The RFSA2624 also offers a rugged Class 1B HBM ESD rating via on-chip ESD circuitry. The MCM package is footprint compatible with most 24-pin, 4mm, QFN packages. Cellular, PCS, GSM, UMTS, LTE, WiMax/WLAN Wireless Data, Satellite Terminals Test Equipment Ordering Information RFSA2624SR RFSA2624SQ RFSA2624TR7 RFSA2624TR13 RFSA2624PCK-410 7” Reel with 100 pieces Sample bag with 25 pieces 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 Si BJT GaN HEMT BiFET HBT LDMOS 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. ©2006, RF Micro Devices, Inc. DS110408 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 1 of 9 RFSA2624 Absolute Maximum Ratings Parameter Supply Voltage Rating Unit +5.5 V DC Supply Current 15 mA Power Dissipation 83 mW Max RF Input Power 27 dBm Operating Temperature (TCASE) -40 to +85 °C Storage Temperature -40 to +150 °C Junction Temperature 150 °C ESD Rating (HBM) Frequency Range 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. RoHS status based on EUDirective2002/95/EC (at time of this document revision). 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. Class 1B Moisture Sensitivity Level Parameter Caution! ESD sensitive device. MSL3 Min. Specification Typ. 50 Insertion Loss Max. MHz dB 150MHz, 0dB attenuation 1.9 dB 850MHz, 0dB attenuation dB 2700MHz, 0dB attenuation 2.8 dB 3800MHz, 0dB attenuation 0.5dB step size 2.3 2.5 Gain Control Range Condition 4000 1.5 1.7 Unit 31.5 dB ±(0.15+5.0% attenuation setting) dB Input IP3 (0 - 15.5dB states) 48 dBm 700MHz to 2700MHz, all states Input P1dB 27 dBm 700MHz to 2700MHz, all states Return Loss 13 dB 700MHz to 2700MHz, all states Control Interface 6 bit Serial Interface Step Accuracy Settling Time 250 nS tRISE, tFALL (10%/90% RF) Switching Speed 250 nS tON, tOFF (50% CTL to 10%/90% RF) Supply Voltage (VDD) 4.75 Supply Current Control Voltage (VCTL) 5.0 5.25 5 V mA 0 0.8 V Low 2.0 VDD V High Notes: 1. VDD =5V, VCTL =3V, T=25°C 2. Broadband Application Circuit (with ACG capacitors) 3. IIP3 measured with Pin=+10dBm/tone, 1MHz spacing 2 of 9 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110408 RFSA2624 Typical Performance - Broadband Application Circuit (25°C) Insertion Loss (De-embedded) Normalized Attenuation, MajorStates 0.0 0 25C -0.5 85C -10 Attenuation (dB) -1.0 Insection Loss (dB) -5 -40C -1.5 -2.0 -2.5 -3.0 -3.5 0.5 2 8 31.5 -20 -25 -30 -40 0.0 0.5 1.0 1.5 2.0 2.5 Frequency (GHz) 3.0 3.5 4.0 0.0 0.5 2 8 31.5 1.5 2.0 2.5 Frequency (GHz) 3.0 3.5 0 1 4 16 -5 Return Loss (dB) 0 1 4 16 -10 1.0 4.0 0 0 -5 0.5 Return Loss of RF2, MajorStates Return Loss of RF1, MajorStates -15 -20 -25 -30 -10 0.5 2 8 31.5 -15 -20 -25 -30 -35 -35 -40 -40 0 0.5 1 1.5 2 2.5 Frequency (GHz) 3 3.5 0 4 0.8 0.6 0.6 0.4 0.4 Step Error(dB) 0.8 0.2 0.0 -0.2 0.5 2 8 31.5 -0.4 -0.6 1 4 16 DS110408 0.5 1 1.5 2 2.5 Frequency (GHz) 3 3.5 4 0.0 -0.2 -0.6 1.5 2 2.5 Frequency (GHz) 1 0.2 -0.4 -0.8 0 0.5 Step Error vs. Attenuation State Step Error, MajorStates Step Error (dB) 1 4 16 -35 -4.0 Return Loss (dB) -15 3 3.5 4 50MHz 500MHz 1GHz 2GHz 3GHz 4GHz -0.8 0 4 8 12 16 20 24 28 32 Attenuation (dB) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 3 of 9 RFSA2624 Typical Performance - Broadband Application Circuit (25°C) (Continued) Relative Phase, MajorStates Worst Case Successive Step Error 60 0.8 0.5 2 8 31.5 40 1 4 16 0.6 0.4 30 Error(dB) Relative Phase (deg) 50 20 10 0.2 0.0 0 -0.2 -10 -0.4 -20 0 4 of 9 0.5 1 1.5 2 2.5 Frequency (GHz) 3 3.5 4 -0.6 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Frequency(GHz) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110408 RFSA2624 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 Note: C 0.5=D0, C1=D1, ... C16=D5 (for the purpose of the example below) Serial Port Interface Programming example – 6-bit SPI Timing Diagram t6 t1 t2 t3 t4 t8 t5 CLK CLK DATA DATA MSB D5 D4 D3 D2 D1 LSB D0 LE t7 LE t9 DOUT t10 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 t7 5 ns min LE to CLK Setup Time t8 5 ns min CLK to LE Setup Time t9 10 ns min LE Pulse Width t10 20 ns min Output Set DS110408 LOGIC Voltage Levels 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 5 of 9 RFSA2624 Pin Names and Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 EPAD Function GND VDD GND RF1 GND ACG ACG ACG ACG ACG ACG GND ACG GND RF2 GND GND GND NC PUP CLK LE NC DATA GND Description DC and RF Ground. Power supply. DC and RF Ground. RF port. External DC block required. DC and RF Ground. AC ground for operation below 500MHz; leave unconnected above 500MHz. AC ground for operation below 500MHz; leave unconnected above 500MHz. AC ground for operation below 500MHz; leave unconnected above 500MHz. AC ground for operation below 500MHz; leave unconnected above 500MHz. AC ground for operation below 500MHz; leave unconnected above 500MHz. AC ground for operation below 500MHz; leave unconnected above 500MHz. DC and RF Ground. AC ground for operation below 500MHz; leave unconnected above 500MHz. DC and RF Ground. RF port. External DC block required. DC and RF Ground. DC and RF Ground. DC and RF 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. Power-up Programming Truth Table 6 of 9 PUP Attenuator Setting Low Attenuation at max, 31.5dB High Attenuation at min, 0dB 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110408 RFSA2624 C16 C8/PUP C4/CLK C2/LE C1 C05/DATA C025 GND R8 U1 R3 R2 R1 R7 C8 C7R5 R4 C9 C6 C5 C4 C3 C2 C1 J1 RF1 R6 P1 VDD Evaluation Board Assembly Drawing J2 RF2 C12 C17 C14 C16 C15 C13 C11 C18 SA26X4410(C) J99 J100 C19 C20 15.5MIL LINE DS110408 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 7 of 9 RFSA2624 Evaluation Board Schematic Evaluation Board Bill of Materials (BOM) Description Reference Designator Manufacturer Manufacturer's P/N CAP, 680pF, 10%, 50V, X7R, 0402 C13, C15, C16, C17 Murata GRM155R71H681KA01E CAP, 0.1uF, 10%, 10V, X5R, 0402 C11, C12, C19, C20 Taiyo Yuden (USA), Inc. RM LMK105BJ104KV CAP, 1000pF, 10%, 50V, X7R, 0402 C7 Taiyo Yuden (USA), Inc. RM UMK105BJ102KV-F RES, 0 OHM, 0402 R1, R2, R4, R5, R8 Kamaya, Inc RMC1/16SJPTH DNI C1-C6, C8, C9, C14, C18, R3, R6-7 CONN, SMA, END LNCH, UNIV, HYB MNT, FLT J1, J2, J99, J100 Heilind Electronics PER MAT-21-1038 PCB RFSA26X4410(B) CONN, HDR, ST, PLRZD, 9-PIN P1 ITW Pancon MPSS100-9-C RFSA2624SB U1 RFMD RFSA2624 NOTE: Parts with * following the Reference Designator should not be populated on PCBA. RFMD devices (DUT) may require baking per IPC/JEDEC J-STD-020 for a minimum of 24 hours at 125 +5/-0 °C. Assembly must take place within 12 hours of bake completion. Manufacturers' P/Ns are subject to change by the manufacturers following the issue of this document and are thereby included for reference only. Contact RFMD Corporate Engineering Materials with questions regarding specific Manufacturers' P/Ns. Shaded lines indicate approved alternate components. 8 of 9 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110408 RFSA2624 Package Drawing DS110408 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 9 of 9