RF2421 9 10dB SWITCHED ATTENUATOR Typical Applications • Power Control in Communication Systems • Commercial and Consumer Systems • CMOS Compatible Programmable • Portable Battery-Powered Equipment Attenuator Product Description -A0.008 0.004 0.018 0.014 0.196 0.189 0.050 0.157 0.150 0.244 0.229 8° MAX 0° MIN Optimum Technology Matching® Applied Si BJT GaAs HBT Si Bi-CMOS SiGe HBT ! 0.034 0.016 0.068 0.053 Dimensions in mm 0.009 0.007 NOTES: 1. Shaded lead is Pin 1. 2. All dimensions are excluding mold flash. 3. Lead coplanarity 0.005 with respect to datum "A". 9 ATTENTUATORS AND SWITCHES The RF2421 is a monolithic switched attenuator. The device is built using a Gallium Arsenide process technology and has a single step attenuation of 10dB. The input and output of the device has a low VSWR 50Ω match. The RF output can drive up to +16dBm. This unit is intended for use in systems that require RF power control by digital means. No negative supply voltages are required, and the current consumption is less than 5 µA when the attenuator is off. Package Style: SOIC-8 GaAs MESFET Si CMOS Features • Single 2.7V to 6V Supply • 10dB Single Step Attenuation • 1 dB Insertion Loss • 1-bit Digitally Controlled Attenuation • Digitally Controlled Power Down Mode NC 1 8 NC RF IN 2 7 G10 GND 3 6 VDD RF OUT 4 5 NC Functional Block Diagram Rev A6 001102 • 500MHz to 3000 MHz Operation Ordering Information RF2421 RF2421 PCBA 10dB Switched Attenuator Fully Assembled Evaluation Board RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 9-15 RF2421 Absolute Maximum Ratings Parameter Supply Voltage Control Voltage Input RF Power Operating Ambient Temperature Storage Temperature Parameter Rating Unit -0.5 to +6.0 -0.5 to +6.0 +20 -40 to +85 -40 to +150 VDC V dBm °C °C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Specification Min. Typ. Max. Unit 500 to 3000 1.0 10 0.25 MHz dB dB dB T=25 °C, VDD =5.0V, Freq=915MHz Overall Frequency Range Insertion Loss Insertion Loss Gain Flatness Condition 9.5 1.5 10.5 VG10 =0VDC VG10 =VDD In any 50MHz band Input Input Impedance Input VSWR Input 1dB Compression Ω 50 1.3:1 +17 dBm Attenuation Control Attenuation “ON” Voltage Attenuation “OFF” Voltage Current Response Time ATTENTUATORS AND SWITCHES 9 2.5 VDD 0.4 <10 0.3 0.5 V V mA ns Voltage supplied to input Voltage supplied to input Into control line, VG10 =5VDC With 0dBm output in each of 2 tones, attenuation “OFF”. With 0dBm output in each of 2 tones, attenuation “OFF”. Output IM3 -60 dBc Harmonic Output -40 dBc Output Impedance Output VSWR Ω 50 1.3:1 Power Supply Voltage 2.7 Current 9-16 5 5 6.0 0.5 5 V V mA µA Specifications Operating Limits Attenuation “ON” Attenuation “OFF” Rev A6 001102 RF2421 Pin 1 2 Function NC RF IN Description Interface Schematic Not internally connected. This pin can be grounded. RF Input. This pin is not DC blocked, and an external blocking capacitor is recommended. The value depends on the frequency used. RF IN 3 GND 4 RF OUT 5 6 7 NC VDD G10 8 NC RF OUT Ground connection. Keep trace physically short and connect immediately to the ground plane for best performance. RF Output. This pin is not DC blocked, and an external blocking capac- See pin 2. itor is recommended. The value depends on the frequency used. Not internally connected. This pin can be grounded. Power supply pin. An external RF bypass capacitor is recommended. Control pin for the 10dB attenuator. This pin has an internal pull-down resistor, so when the pin is not connected the attenuator will be turned off. G10 Not internally connected. This pin can be grounded. Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) ATTENTUATORS AND SWITCHES 9 P1 P1-1 P1-3 1 VDD 2 GND 3 ATTN 2421400 Rev A RF IN J1 RF OUT J2 Rev A6 001102 50 Ω µstrip 50 Ω µstrip C3 100 pF C4 100 pF 1 8 2 7 3 6 4 5 P1-3 P1-1 C1 100 pF C2 100 nF 9-17 RF2421 Evaluation Board Layout Board Thickness 0.031”; Board Material FR-4 ATTENTUATORS AND SWITCHES 9 9-18 Rev A6 001102