RFSA3714 RFSA3714 50MHz to 6000MHz, Digital Step Attenuator C0.5 C1 C2 C4 C8 C16 The RFMD’s RFSA3714 is a 7-bit digital step attenuator (DSA) that features high linearity over the entire 31.75dB gain control range with 0.25dB steps. The RFSA3714 features three modes of control: serial, latched parallel, and direct parallel programming. The RFSA3714 has a low insertion loss of 1.5dB at 2GHz. Patent pending circuit architecture provides Overshoot-free transient switching performance. The RFSA3714 is available in a 4mm x 4mm QFN package. 24 23 22 21 20 19 C0.25 1 18 SI VDD 2 17 CLK PBAR/S 3 16 LE GND 4 15 GND 14 RFOUT 13 GND 8 9 10 11 12 GND GND 7 GND 6 GND GND GND 5 7-BIT DSA GND RFIN LOGIC CONTROL Functional Block Diagram Package: QFN, 24-pin, 4.0mm x 4.0mm x 0.85mm Features ■ 7-Bit, 31.75dB Range, 0.25dB Step ■ Patent Pending Circuit Architecture ■ Overshoot-free Transient Switching Performance ■ Frequency Range 50MHz to 6000MHz ■ High Linearity, IIP3 >55dBm ■ Serial and Parallel Control Interface ■ Fast Switching Speed, <120nsec ■ Single Supply 3V to 5V Operation ■ RF Pins Have No DC Voltage, Can be DC Grounded Externally ■ Power-up Default Setting Is Maximum Attenuation Applications ■ 2G through 4G Base Stations ■ Point-to-Point ■ WiFi ■ Test Equipment Ordering Information RFSA3714SQ Sample bag with 25 pieces RFSA3714SR 7" Reel with 100 pieces RFSA3714TR13 13" Reel with 2500 pieces RFSA3714PCK-410 50MHz to 6000MHz PCBA with 5-piece sample bag RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. ® DS141203 ® RF MICRO DEVICES and RFMD 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. ©2013, RF Micro Devices, Inc. 1 of 20 RFSA3714 Absolute Maximum Ratings Parameter Rating Unit Supply Voltage (VDD) -0.5 to +6.0 V All Other DC and Logic Pins (Supply Voltage Must Be Applied Prior to Any Other Pin Voltages) -0.5 to +6.0 V Maximum Input Power at RFIN Pin at 85°C Case Temperature +30 dBm Maximum Input Power at RFOUT Pin at 85°C Case Temperature +27 dBm Storage Temperature Range -40 to +150 °C ESD Rating - Human Body Model (HBM) 1000 V Moisture Sensitivity Level MSL1 Caution! ESD sensitive device. RFMD Green: RoHS status based on EU Directive 2011/65/EU (at time of this document revision), 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. 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. Recommended Operating Condition Specification Parameter Min Operating Temperature Range (RF Input Power Handling Derates Above 85°C) Typ -40 Operating Junction Temperature Supply Voltage 2.7 Max Unit +105 °C 125 °C 5.5 V Nominal Operating Parameters Specification Parameter Unit Min Typ Condition Max General Performance Supply Current Thermal Resistance 180 µA 55 °C/W RF Input Power at RFIN Pin 27 dBm RF Input Power at RFOUT Pin 20 dBm 6000 MHz Steady state operation, current draw during attenuation state transitions is higher. At maximum attenuation state with RF power applied to the RFIN pin Continuous operation at +85°C case temperature RF Performance Frequency Range Insertion Loss 50 1.5 dB 2000MHz, 0dB attenuation 31.75 dB 0.25dB step size ±(0.2 + 4%) dB Input IP3 55 dBm Input P0.1dB 30 dBm Return Loss 15 dB Input and Output Impedance 50 Ω Attenuation Range Absolute Attenuation Error RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 2 of 20 RFSA3714 Specification Parameter Min Unit Condition 120 nsec 50% control to 10%/90% RF 2 Deg 2000MHz Typ Max General Performance Switching Speed Successive Step Phase Delta Control Digital Logic Low Digital Logic High 0.63 1.17 V V Note: Typical performance at these conditions: Temp = 25°C, 2000MHz, 5V Supply Voltage RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 3 of 20 RFSA3714 Typical Application Schematic RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 4 of 20 RFSA3714 Typical Performance: 0.25dB Steps RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 5 of 20 RFSA3714 Typical Performance: 0.25dB Steps Note: Attenuator remains monotonic if step error is less than +0.25dB. RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 6 of 20 RFSA3714 Typical Performance: 0.25dB Steps RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 7 of 20 RFSA3714 Typical Performance: 0.25dB Steps RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 8 of 20 RFSA3714 Typical Performance: 0.5dB Steps Typical Performance: 1.0dB Steps Notes: 1. Top 2 Plots: Attenuator remains monotonic if step error is less than +0.5dB. 2. Bottom 2 Plots: Attenuator remains monotonic if step error is less than +1.0dB RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 9 of 20 RFSA3714 Evaluation Board Schematic 50MHz to 6000MHz Application Circuit RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 10 of 20 RFSA3714 Evaluation Board Bill of Materials (BOM) 50MHz to 6000MHz Application Circuit Description Reference Designator SA3714-410 Manufacturer Manufacturer's P/N Dynamic Details (DDI) Toronto SA3714-410(B) Digital Step Attenuator 50MHz to 6000MHz U1 RFMD RFSA3714SB CAP, 1µF, 10%, 25V, X7R, 1206 C34 Taiyo Yuden (USA), Inc. CE TMK316BJ105KL-T J1-J4 Molex SD-7351-4000 CONN, HDR, ST, 9-PIN, 0.100” P1 Samtec Inc. TSW-109-07-G-S CONN, SKT, 24-PIN DIP, 0.600”, T/H P2 Aries Electronics Inc. 24-6518-10 MOD, USB TO SERIAL UART, SSOP-28 M1 (See Note 1) Future Technology Devices Int’l UM232R CONN, HDR, ST, 3 x 5, 0.100”, T/H P3 (See Note 2) Samtec Inc. TSW-105-07-L-T CONN, HDR, ST, 2-PIN, 0.100: P4 Samtec Inc. TSW-102-07-G-S CONN, HDR, 2 x 4, RA, 0.100, T/H P5 Samtec Inc. TSW-104-08-G-D-RA CONN, HDR, ST, PLRZD, 2-PIN, 0.100” P6 ITW Pancon MPSS100-2-C CAP, 470pF, 5%, 50V, C0G, 0402 C40 Murata Electronics GRM1555C1H471JA01D Jumper, 2-Pin S1-S2 (See Note 2) 3M Interconnect Solutions 929950-00 DNP C20-C26, C29, C33, C35-C39, S6 N/A N/A CONN, SMA, END LNCH, UNIV, HYB MNT Notes: 1. 2. M1 should be mounted into P2 with respect to the Pin 1 alignment of M1 and P2. Jumpers S1 and S2 should be installed on P3. RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 11 of 20 RFSA3714 Evaluation Board Assembly Drawing RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 12 of 20 RFSA3714 Evaluation Board Jumper Programming Jumpers Connector Signal Logic Voltage S1 Position U1 Connection Comment 0 VDD (From P6) 1 VIO (From P5) 0 GND Parallel Mode 1 U1_VDD Serial Mode OPEN LE All Other Modes INSTALLED LE (From P5 Pin 3) Serial Mode Using P5 P3 S2 S6 PBar/S P4 LE Note: Default jumper settings are BOLD. Evaluation Board Programming Using USB Interface Serial Mode All programming jumpers on the evaluation board are set to the default values indicated in the table. Refer to the Control Bit Generator (CBG) Software Reference Manual for detailed instructions on how to setup the software for use. Apply the supply voltage to P6. Select ‘RFSA3714’ from the RFMD parts list of the CBG user interface. Set the attenuation value using the CBG user interface. The attenuator is set to the desired state and measurement can be taken. Latched Parallel Mode Evaluation board programming jumper S2 is set to ‘0’. All other programming jumpers are not required and can be set to any position. Refer to the Control Bit Generator Software Reference Manual for detailed instructions on how to set up the software for use. Apply the supply voltage to P6. Select ‘RFSA3714-P’ from the RFMD part list of the CBG user interface. Set the attenuation value using the CBG user interface. The attenuator is set to the desired state and measurements can be taken. Evaluation Board Programming Using External Bus Serial Mode The configuration allows the user to control the attenuator through the P5 connector using an external harness. Remove the USB interface board if it is currently installed on the evaluation board. Connect a user-supplied harness to the P5 connector. Note that the top row of P5 contains the serial bus signals and the bottom row is ground. Programming jumper S1 is set to ‘0’ and S2 is set to ‘1’. Jumper S6 is installed and allows the LE signal to be routed from the P5 connector to the attenuator. Apply the supply voltage P6. Send the appropriate signals onto the serial bus lines in accordance with the Serial Mode Timing Diagram. The attenuator is set to the desired state and measurements can be taken. RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 13 of 20 RFSA3714 Latched Parallel Mode This configuration allows the user to control the attenuator through the P1 connector using an external harness. Remove the USB interface it if is currently installed on the evaluation board. Connect a user-supplied harness to the P1 connector. The parallel bus signal names for P1 are indicated on the evaluation board. Programming jumper S2 is set to ‘0’ to select parallel mode. All other programming jumpers are not required and can be set to any position. Apply the supply voltage to P6. Send the appropriate signals onto the parallel bus lines in accordance with the Latched Parallel Mode Timing Diagram. The attenuator is set to the desired state and measurements can be taken. Direct Parallel Mode This configuration allows the user to control the attenuator through the P1 connector using an external harness. When using this mode the LE signal is held at logic high so that the attenuation will change immediately when there is a change in logic state for any of the parallel bus signals. Remove the USB interface if it is currently installed on the evaluation board. Connect a user-supplied harness to the P1 connector. The parallel bus signal names for P1 are indicated on the evaluation board. Programming jumper S2 is set to ‘0’ to select parallel mode. All other programming jumpers are not required and can be set to any position. Apply the supply voltage to P6. Send the appropriate signals onto the parallel bus lines. The attenuator is set to the desired state and measurements can be taken. Default Power-up State The default attenuation state is maximum (31.75dB) when supply voltage is applied to the attenuator in both serial and parallel modes. If a different attenuation state is desired during power up, this can be accomplished by applying signals according to the Parallel Mode Truth Table. The attenuator will power up to the state applied to the parallel bus during turn on. The LE signal must be held to logic ‘0’ during power up. RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 14 of 20 RFSA3714 Pin Names and Descriptions Pin Name Description 1 C0.25 0.25dB Parallel Control Bit 2 VDD Supply Voltage 3 PBAR/S 4 GND Ground Pin 5 RFIN RF Input Pin, Incident RF power must enter this pin for rated thermal performance and reliability. Do not apply DC power to this pin. Pin may be DC grounded externally and is grounded thru resistors internal to the part. 6 GND Ground Pin 7 GND Ground Pin 8 GND Ground Pin 9 GND Ground Pin 10 GND Ground Pin 11 GND Ground Pin 12 GND Ground Pin 13 GND Ground Pin 14 RFOUT 15 GND 16 LE 17 CLK Serial Clock Input 18 SI Serial Data Input 19 C16 16dB Parallel Control Bit 20 C8 8dB Parallel Control Bit 21 C4 4dB Parallel Control Bit 22 C2 2dB Parallel Control Bit 23 C1 1dB Parallel Control Bit 24 C0.5 Mode Select Pin Logic Low = Parallel Logic High = Serial RF Output Pin; Do not apply DC power to this pin. Pin may be DC grounded externally and is grounded thru resistors internal to the part. Ground Pin Latch Enable, The leading edge of signal on LE causes the attenuator to change setting for serial and latched parallel modes. For direct parallel mode keep LE at a logic high level. 0.5dB Parallel Control Bit RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 15 of 20 RFSA3714 Serial Mode Attenuation Word Truth Table Attenuation Word D6 D5 D4 D3 D2 D1 D0 (LSB) Attenuation State D7 X L L L L L L L 0dB / Reference Insertion Loss X L L L L L L H 0.25dB X L L L L L H L 0.5dB X L L L L H L L 1dB X L L L H L L L 2dB X L L H L L L L 4dB X L H L L L L L 8dB X H L L L L L L 16dB X H H H H H H H 31.75dB Serial Mode Timing Diagram PBAR/S X X LE CLK SI X D0 D1 D2 D3 D4 D5 D6 D7 X Note: Bit D7 is not used and can be set to logic high or low RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 16 of 20 RFSA3714 Parallel Mode Truth Table Parallel Input Control Setting Attenuation State D6 (C16) D5 (C8) D4 (C4) D3 (C2) D2 (C1) D1 (C0.5) D0 (C0.25) L L L L L L L 0dB / Reference Insertion Loss L L L L L L H 0.25dB L L L L L H L 0.5dB L L L L H L L 1dB L L L H L L L 2dB L L H L L L L 4dB L H L L L L L 8dB H L L L L L L 16dB H H H H H H H 31.75dB Latched Parallel Mode Timing Diagram D[6:0] X VALID X D[6:0] External Parallel Attenuation Setting PBAR/S X X LE RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 17 of 20 RFSA3714 Serial Bus Timing Specifications Parameter Limit Unit Comment t1 25 MHz max CLK Frequency t2 20 ns min CLK High t3 20 ns min CLK Low t4 5 ns min SI to CLK Setup Time t5 5 ns min SI to CLK Hold Time t6 30 ns min SI 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 RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 18 of 20 RFSA3714 Package Outline Drawing (Dimensions in millimeters) RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 19 of 20 RFSA3714 Branding Diagram RF Micro Devices Inc. 7628 Thorndike Road, Greensboro, NC 27409-9421 For sales or technical support, contact RFMD at +1.336.678.5570 or [email protected]. DS141203 The information in this publication is believed to be accurate. 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. 20 of 20