Agilent 34945A, L4445A, and L4490A/L4491A Configuration Guide Contents Introduction 2 Step 1 Supported Agilent Switches and Attenuators 2 Step 2 Distribution Boards, Bracket Kits, and Cable Kits 5 Bracket and Cable Kit Usage 5 RF Cable and Connector Suppliers 6 Step 3 Switch/Attenuator Driver Instruments and Platforms 6 The 34945A and L4445A Microwave Switch/Attenuator Drivers 6 The L4490A/L4491A RF Switch Platforms 6 System Interconnections Defined 9 L4490A and L4491A RF Switch Platform
Introduction RF/Microwave switches are used in a wide variety of applications ranging from DC to over 50 GHz. These applications can include: • Wireless Communications, • Broadband CATV, • Communication Satellites, • Test and Measurement Equipment, • Electronic Radar and Defense Systems, • Avionics, • Medical Electronics, • Space Programs.
Table 1. Common Agilent RF/Microwave Switches and Attenuators Switch model Description Frequency range Reference document number 1 N1810UL N1810TL N1811TL N1812UL 87104A 87104B 87104C Un-terminated latching 3-port (SPDT) Terminated latching 3-port (SPDT) Terminated latching 4-port (bypass) Un-terminated latching 5-port SP4T 4-port latching, terminated SP4T 4-port latching, terminated SP4T 4-port latching, terminated DC – 2, 4, 20, or 26.5 GHz 5968-9653E DC – 4 GHz DC – 20 GHz DC – 26.
Table 1. Common Agilent RF/Microwave Switches and Attenuators, continued Switch model Description Frequency range Reference document number 1 8765A 8765B 8765C 8765D Coaxial (SPDT),SMA Coaxial (SPDT),SMA Coaxial (SPDT),3.5 mm Coaxial (SPDT),2.4 mm DC – 4 GHz DC – 20 GHz DC – 26.
Step 2 Distribution Boards, Bracket Kits, and Cable Kits Switches and attenuators are connected to the Agilent 34945A and L4445A Microwave Switch/Attenuator Drivers and the L4490A/L4491A RF Switch Platform through distribution boards installed on the 34945EXT module (see System Interconnections Defined). There are five distribution boards (Y1150A – Y1154A) designed to allow Agilent’s most popular switches and attenuators to be driven directly.
RF Cable and Connector Suppliers There are several suppliers for RF cables and connectors for the switches/attenuators used within the L4490A and L4491A RF switch platforms. For convenience, three of these suppliers are listed below: Pasternack Enterprises, Inc. http://www.pasternack.com Micro-Coax® http://www.micro-coax.com S. M. Electronics L.L.C. http://www.smelectronics.
LAN hub/switch * = standard LAN cables * * or LAN cross-over cables for direct PC – 34980A/L4445A connection if PC is non Auto-MDIX (cable p/n 5061-0701) Agilent 34980A Agilent L4445A Ag ilen t Te ch no lo gie s I/O interfaces: LAN GPIB (optional) L4445AM ic row av e S witch/A tte nuator Dr iv er CO NT RO L BUS AT TN LAN PWR LAN Re set I/O interfaces: LAN (shown) GPIB USB 34945A Plug-in module +24 V 8121-1289 +24 V 1 2 3 4 E X P AN S IO N B US 8121-1289 P O RT2 P O RT1 Master 34945EXT
LAN hub/switch * or * = standard LAN cables * LAN cross-over cables for direct PC – L4490A/L4491A connection if PC is non Auto-MDIX Cable p/n 5061-0701 Agilent L4491A +24 V supplied from L4491A I/O interfaces: LAN GPIB (optional) +24 V supplied from L4491A L4491A Option 002 34945EXT #2 1st slave 34945EXT #1 (master) * Agilent L4490A +24 V supplied from L4490A Master 34945EXT connects to 1st slave through Expansion Port 1. Expansion ports on slaves are interchangeable.
System Interconnections Defined The following sections describe the interconnections and components of the 34945A, L4445A, and L4490A/L4491A as shown in Figures 2 and 3. PC to 34945A, L4445A, or L4490A/ L4491A When connecting the PC directly to the 34980A (34945A), L4445A, or L4490A/ L4491A, the LAN cross-over cable (p/n 5061-0701) provided with the instruments is used. If your PC supports Auto-MDIX or contains a LAN card with Gigabit data transfer rates, the cross-over cable is not required.
L4490A and L4491A RF Switch Platform Product Options There are five product options available for the L4491A and one option available for the L4490A. All options are factory installed and must be specified at the time of order. The product options include: L4491A • Option 001: multiport front panel. Front panel modification for mounting up to eight multiport switches. Includes mounting hardware. Switch cables must be ordered separately (Y1159A – Table 1). Figure 4.
Internal/External Power Supply Considerations As shown in Figures 2 and 3, the channel drive source for the master 34945EXT is provided through the internal +24 V power supply of the 34945A, L4445A, and L4490A/L4491A. If necessary, external supplies can be used. For either case, the supply must meet the quiescent (continuous) and switching current requirements of the switches in your application.
External Supply Each 34945EXT module is limited to 2 A continuous current from an externally connected power supply (4.75 V to 30 V). The actual amount of power required by each EXT module depends on the types of switches used. When using an external power supply with either the master 34945EXT module or slave 34945EXT modules (required), the supply must be able to provide the quiescent current requirement of the EXT modules, plus the quiescent and switching currents of the switches themselves.
System configuration chart Switch/ attenuator Quantity Options * coil * voltage * connector Distribution boards Quantity Bracket kit or cable kit Related Agilent Literature Data sheets Application notes • Agilent 34980A Multifunction Switch/ Measure Unit 5989-1437EN • Test System Signal Switching, AN 1441-1 5988-8627EN http://cp.literature.agilent.com/ litweb/pdf/5988-8627EN.pdf http://cp.literature.agilent.com/ litweb/pdf/5989-1437EN.
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