The Keysight (Agilent) 34905A is a Dual 4-Channel RF Multiplexer module designed for the 34970A and 34972A Data Acquisition/Switch Units. It provides broadband switching capabilities for high-frequency and pulsed signals in 50 Ohm systems, featuring a usable bandwidth of up to 2 GHz. Built with two independent, unterminated 1x4 multiplexers, it features common low shielding and switched center conductors to route test signals cleanly. It includes ten 1.2-meter BNC-to-SMB adapter cables to interface directly with standard BNC connections.
Specifications
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered via mainframe backplane |
| Operating Temperature | 0°C to 55°C |
RF Input/Output Channels
| Parameter | Value |
|---|---|
| Number of Channels | 8 (arranged as two independent 1x4 multiplexers) |
| Multiplexer Configuration | Dual 1x4 |
| Characteristic Impedance | 50 Ω |
| Connector Type | SMB (on module) |
| Isolator/Shielding Type | Common Low (switched center conductor, common shield) |
| Termination Option | Unterminated |
RF Performance Specifications
| Parameter | Value |
|---|---|
| Frequency Range | DC to 2 GHz |
| Insertion Loss (100 MHz) | < 0.20 dB |
| Insertion Loss (500 MHz) | < 0.25 dB |
| Insertion Loss (1 GHz) | < 0.50 dB |
| Insertion Loss (2 GHz) | < 1.00 dB |
| VSWR (100 MHz) | < 1.15 |
| VSWR (500 MHz) | < 1.25 |
| VSWR (1 GHz) | < 1.35 |
| VSWR (2 GHz) | < 1.45 |
| Isolation (100 MHz) | > 60 dB |
| Isolation (500 MHz) | > 50 dB |
| Isolation (1 GHz) | > 45 dB |
| Isolation (2 GHz) | > 35 dB |
| Crosstalk (100 MHz) | < -60 dB |
| Crosstalk (500 MHz) | < -50 dB |
| Crosstalk (1 GHz) | < -45 dB |
| Crosstalk (2 GHz) | < -35 dB |
| Propagation Delay | < 3.0 ns |
| Rise Time | < 300 ps |
| Phase Matching Between Channels | < 100 ps (between channels of the same bank) |
DC & Signal Carrying Capacity
| Parameter | Value |
|---|---|
| Maximum Switching Voltage | 42 V (DC or AC peak) |
| Maximum Switching Current | 0.7 A |
| Maximum Carry Current | 0.7 A |
| Maximum Switching Power (DC) | 10 W |
Relay Specifications
| Parameter | Value |
|---|---|
| Relay Type | Miniature coaxial reed |
| Mechanical Life Cycles | 100,000,000 cycles |
Mainframe Integration & Control
| Parameter | Value |
|---|---|
| Compatible Mainframes | Keysight / Agilent 34970A, 34972A |
| Module Slot Occupancy | 1 slot |
| Built-in Relay Cycle Counter | Yes |
Physical Characteristics
| Parameter | Value |
|---|---|
| Included Accessories | 10 BNC-to-SMB 50 Ω adapter cables (1.2m) |
| Cable Options | Option 001 deletes BNC-to-SMB adapter cables |
Environmental & Safety
| Parameter | Value |
|---|---|
| Operating Temperature Range | 0°C to 55°C |
| Storage Temperature Range | -40°C to 70°C |
| Operating Humidity Range (Non-condensing) | Up to 80% R.H. at 40°C |
Technology
RF Switching / Multiplexing
Applications
Automated Test Equipment (ATE), RF and Microwave Routing