1:8 Signal Router/8:1 Reflective Scanner

Applications:

• Switching GHz/Sub-ns Rise Time Signals
• GHz Signal Routing or Scanning
• Differential Signal Routing or Scanning

Features:

• 10 ps Typical Channel-Channel Skew
• DC to 2.5 GHz Usable Frequency Range
• Up to 1.75 GHz 3 dB bandwidth
• Z₀ =50 Ω
• Typical 1.65 dB Insertion loss and 46 dB Isolation @ 1.25 GHz
• 6 ms Switching Time
• SMA I/O Connectors
• Manual or Remote Control
• Includes AC/DC Adapter

Description:

The PRL-8108 is a 1:8 DC coupled signal router designed for 50 Ω I/O applications. The usable frequency band extends from DC to >2.5 GHz. A signal connected to input D can be routed to output Q1-Q8. It can also be used as a Reflective Scanner in the reverse direction to scan signals on the Q inputs at the D output. Because signals connected to the non-selected ports are not terminated, these signals will be reflected, hence the term reflective scanner. There are three related models:

• PRL-8108, 1:8 Signal Router/8:1 Reflective Scanner, as described above
• PRL-8216, 2 x 1:8 Signal Router/8:1 Reflective Scanner, with two identical sets of channels
• PRL-8324, 3 x 1:8 Signal Router/8:1 Reflective Scanner, with three identical sets of channels

The PRL-8108 is designed for scanning or routing single-ended signals, while the PRL-8216 can be used for simultaneous scanning or routing of differential signals. The PRL-8324 adds a third signal path for routing an additional signal, such as a timing reference. Each channel set is fully independent and can be controlled separately or slaved to another set's control input or switch, as described below.

Each 8-channel set has an 8-position rotary switch for manual channel selection, a toggle switch for Manual/Remote selection, and 8 LEDs for channel ID. Each set also has 3 x 2 stick pins (pulled up to +5V via 4.99 kΩ resistors) for TTL/CMOS remote control inputs. An parallel set of 3 x 2 stick pins allows control signals to be cascaded to additional sets or units for simultaneous switching. When the toggle switch is set to the Remote position (Up) the logic inputs are left open, Bits A0, A1, and A2 all float high, and channel Q8 is selected. Jumpers or remote inputs may be used to pull the pins low. When the unit is not powered, Q8 is also selected.

The pin designations and truth tables for the logic inputs are shown in Table I, and a block diagram is shown in Fig. 1. When the toggle switch is in the Manual (Down) position the rotary switch selects the channel, and the remote control pins should be disconnected.

Table I: Logic Input Truth table for PRL-8108
0 V ≤ L ≤ 0.4 V; 2 V ≤ H ≤ 5 V

The PRL-8108 series can be controlled from the PRL-USBIO-1 module (LabVIEW primitives available), the PRL-ETHIO-1 module, or any external controller that can pull the control pins down.

The PRL-8108 series has SMA signal I/O connectors and is housed in a 3.0 x 6.8 x 4.0-in. aluminum extrusion. BNC I/Os are available by special order only. Each unit includes a ±8.5 V AC/DC adapter. Cable #88004001(various lengths) may be used to connect the control pins to a digital I/O device and/or to cascade control signals from one PCB or unit to another PCB or unit.