Programmable Attenuators Model 4238 GaAs Switched Programmable Attenuator 10 MHz to 2.5 GHz 1 Watt RoHS Low Insertion Loss, High IP3 INCREMENTAL ATTENUATION ACCURACY: CELL 0.25 0.50 dB +0.15 +0.15 +0.2 +0.2 1 2 4 8 16 +0.2 +0.2 +0.3 24 32 48 +0.4 +0.6 +0.8 MAXIMUM INSERTION LOSS (dB): Frequency Range (GHz) 4238-X 0.01 - 1.0 1.0 - 2.0 2.0 - 2.5 Features Ideal for use in Wireless/Cellular, RF Simulation/Emulation, & Communication Test Applications. o Broadband Performance - 10 MHz to 2.5 GHz usable dc to 10 MHz with reduced specifications o High IP3 and High Power Rating - Utilizes MESFET Switching o Flexible DC Voltage (+5 to +15 V) o Low DC Power Consumption - Ideal for portable battery powered equipment. o Custom Configurations including bus controlled attenuator subsystems Specifications NOMINAL IMPEDANCE: 50 Ω FREQUENCY RANGE: 10 MHz to 2.5 GHz MAXIMUM SWR: Frequency Range (GHz) 0.01 - 0.25 0.25 - 2.5 SWR 1.75 1.40 CELL CONFIGURATIONS: Model NO. Attenuation Number Cells Range/Steps (dB) Cell Increments (dB) 4238-63.75 8 63.75/0.25 0.25, 0.5, 1, 2, 4, 8, 16, 32 4238-103 8 103/1 1, 2, 4, 8, 16, 24, 48 6.75 8.25 9.75 MONOTONICITY: 10 MHz to 2.5 GHz (minimum 1 dB change) 3rd ORDER INTERMODULATION (IM3): -60 dBm typical, measured with two +27 dBm tones @ 869 MHz (f1) and 894 MHz (f2), the IM3 frequency being 847 MHz (2fl-f2). IP3 (input) = +65 dBm The input IP3 is derived from the following relationship: IP3 = 3(Pin-α)-IM3 + α 2 where α = the insertion loss (dB) at the IM3 frequency; Pin=single tone input power (dBm). INPUT POWER RATING: +30 dBm SWITCHING TIME: 5 μsec. maximum OPERATING VOLTAGE: + 5 to +15 V OPERATING CURRENT: 25 mA typical TEMPERATURE RANGE (Operating): 0°C to +70°C TEMPERATURE COEFFICIENT: <0.002/dB/dB/°C CONNECTORS: SMA female connectors - mate nondestructively with MIL-C-39012 connectors. CONTROL CONNECTOR: AMP-Latch 10 pin ribbon cable connector mates with AMP P/N 746285-1 (supplied with each unit) WEIGHT: 4238-X 150 g (5.3 oz) CONTROL CONFIGURATION: Units are supplied with a built-in TTL interface. Each unit is supplied with a mating 10 pin connector (Amp 746285-1). Refer to Physical Dimensions for mating connector pin/wiring details. Two wires are specified for supply voltage and ground. The remaining wires will accept TTL control signals to activate or de-activate a particular attenuation cell. A TTL high will energize a cell to the high attenuation state, whereas a TTL low will maintain a cell in its zero attenuation state. 243 5305 Spectrum Drive, Frederick, MD 21703-7362 s TEL: 301-846-9222, 800-638-2048 s Fax: 301-846-9116 web: www.aeroflex.com/weinschel s email: [email protected] Revision Date: 3/6/2013 Programmable Attenuators PHYSICAL DIMENSIONS: Model 4238: Aeroflex / Weinschel J1 J2 J3 Control Connector J3 Pin Locations: TTL Conn PIN No. (J3) 4238-103 dB (Cell) 4238-63.75 dB (Cell) 1 1 0.25 1. All dimensions are given in mm (inches) and are maximum, unless otherwise specified. 2 2 0.50 2. Unit available with RoHS compliant materials, specify when ordering. 3 4 1 4 8 2 5 16 4 6 24 8 7 48 16 8 NC* 32 9 +5 to 15V +5 to 15V 10 COM COM NOTE: NC = Not Connected * For Factory use only. 244 5305 Spectrum Drive, Frederick, MD 21703-7362 s TEL: 301-846-9222, 800-638-2048 s Fax: 301-846-9116 web: www.aeroflex.com/weinschel s email: [email protected] Revision Date: 3/6/2013