1:8 Signal Router/8:1 Reflective Scanner


$ 2,173.50


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


  • 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


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.

D Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8
A0 L H L H L H L H
A1 L L H H L L H H
A2 L L L L H H H H

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.

Item Description
PRL-8108-SMA 1:8 Signal Router/8:1 Reflective Scanner, SMA I/Os
PRL-8216-SMA 2 x 1:8 Signal Router/8:1 Reflective Scanner, SMA I/Os
PRL-8324-SMA 3 x 1:8 Signal Router/8:1 Reflective Scanner, SMA I/Os
88004001-0.33 Cable, twisted pair, 1 x 2 header connectors, 4" length
88004001-1 Cable, twisted pair, 1 x 2 header connectors, 1' length
88004001-6 Cable, twisted pair, 1 x 2 header connectors, 6' length
88003002-18 Cable, 50 Ohm, SMA-M/SMA-M, 18" +/-0.1" tolerance
Fig. 1: PRL-8108 Block Diagram

A block diagram of a PRL-8108 PCB is shown above

  • The PRL-8108 consists of one PCB
  • The PRL-8216 consists of two identical PCBs in one enclosure. Each board operates independently unless the control pins are tied together via external cabling.
  • The PRL-8324 consists of three identical PCBs.


The PRL-8108 series is well suited to cascading, in either direction, for creating configurations with larger channel counts and/or special applications, with no engineering required. Please see this Application Note where our sister company designed a set of the similar PRL-854 and PRL-854DC units into a low-noise, high-speed, flexible test multiplexer:


tr/tf Rise/Fall Times (10%-90%)   200 230 ps  
BW Equivalent 3 dB bandwidth 1.50 1.75   GHz  
RIN(RM) Input Resistance, Logic inputs   4.99   Pulled up to +5V
VIH Logic Input Hi Level 2.0 2.0 5.0 V  
VIL Logic Input Lo Level -0.5 0.0 0.5 V  
VSWR1 VSWR, 25 MHz ≤ f ≤ 1.25 GHz   1.35:1      
VSWR2 VSWR,1.25 GHz < f ≤ 2.4 GHz   2.00:1      
VO/VIN1 Insertion Loss, selected Channel   1.65 2.50 dB 625 MHz ≤ f ≤ 1.25 GHz
VO/VIN2 Insertion Loss, selected Channel   6.00 10.00 dB 1.25GHz ≤ f ≤ 2.4GHz
VO/VIN3 Isolation, un-selected Channels 40 46   dB 625 MHz ≤ f ≤ 1.25 GHz
VO/VIN4 Isolation, un-selected Channels 32 38   dB 1.25 GHz ≤ f ≤ 2.4 GHz
tPLH Propagation Delay to Output ↑   900 1200 ps  
tSKEW Skew between any 2 Outputs   10 35 ps  
VINMAX Maximum Input Voltage     30 V  
IMAX Maximum Switching Current     0.5 A  
  Switch Time   6   ms  
  Expected Life Cycles   >106      
VDC DC Input Voltage 7.5 8.5 12 V  
IDC DC Input Current   330 360 mA  
VAC1 AC/DC Adapter Input Voltage, 120 108 115 127 V  
VAC2 AC/DC Adapter Input Voltage, 220 216 230 254 V  
  Logic input for Remote operation 3 x 2 pins (A0, A1, A2)   See Table I
  Size 3.0 x 6.8 x 4.0 in.  
  Weight 2 lbs Excluding AC adapter
  Shipping Weight 6 lbs Including AC adapter