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| RF2421 9 Typical Applications * Power Control in Communication Systems * CMOS Compatible Programmable Attenuator * Commercial and Consumer Systems * Portable Battery-Powered Equipment 10dB SWITCHED ATTENUATOR Product Description -A- 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 50 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 5A when the attenuator is off. 0.008 0.004 0.018 0.014 0.196 0.189 0.050 0.157 0.150 0.244 0.229 Dimensions in mm 0.068 0.053 8 MAX 0 MIN 0.034 0.016 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 Optimum Technology Matching(R) Applied Si BJT Si Bi-CMOS GaAs HBT SiGe HBT ! 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 RF IN 2 GND 3 RF OUT 4 8 NC 7 G10 6 VDD 5 NC * 500MHz to 3000 MHz Operation Ordering Information RF2421 RF2421 PCBA 10dB Switched Attenuator Fully Assembled Evaluation Board Functional Block Diagram RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev A6 001102 9-15 RF2421 Absolute Maximum Ratings Parameter Supply Voltage Control Voltage Input RF Power Operating Ambient Temperature Storage Temperature Rating -0.5 to +6.0 -0.5 to +6.0 +20 -40 to +85 -40 to +150 Unit 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). Parameter Overall Frequency Range Insertion Loss Insertion Loss Gain Flatness Specification Min. Typ. Max. 500 to 3000 1.0 10 0.25 50 1.3:1 +17 2.5 VDD 0.4 <10 -60 -40 50 1.3:1 5 5 0.3 0.5 Unit MHz dB dB dB dBm V V mA ns dBc dBc Condition T=25 C, VDD =5.0V, Freq=915MHz 9.5 1.5 10.5 VG10 =0VDC VG10 =VDD In any 50MHz band Input Input Impedance Input VSWR Input 1dB Compression Attenuation Control Attenuation "ON" Voltage Attenuation "OFF" Voltage Current Response Time Voltage supplied to input Voltage supplied to input Into control line, VG10 =5VDC 9 ATTENTUATORS AND SWITCHES Output IM3 Harmonic Output Output Impedance Output VSWR With 0dBm output in each of 2 tones, attenuation "OFF". With 0dBm output in each of 2 tones, attenuation "OFF". Power Supply Voltage 2.7 Current 6.0 0.5 5 V V mA A Specifications Operating Limits Attenuation "ON" Attenuation "OFF" 9-16 Rev A6 001102 RF2421 Pin 1 2 Function NC RF IN Description 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 RF OUT Interface Schematic 3 4 5 6 7 GND RF OUT NC VDD G10 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. Not internally connected. This pin can be grounded. G10 8 NC Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) 9 P1 P1-1 1 2 P1-3 3 VDD GND ATTN 2421400 Rev A RF IN J1 50 strip C3 100 pF 1 2 8 7 6 5 C1 100 pF C2 100 nF P1-3 P1-1 RF OUT J2 50 strip C4 100 pF 3 4 Rev A6 001102 9-17 ATTENTUATORS AND SWITCHES RF2421 Evaluation Board Layout Board Thickness 0.031"; Board Material FR-4 9 ATTENTUATORS AND SWITCHES 9-18 Rev A6 001102 |
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