4 Ch. RS-422 Receiver, TTL Outputs, SMA I/Os


$ 895.00


  • Differential RS-422 to TTL Logic Level Translation
  • Conversion of Differential Signals Transmitted through Long Lines to Single-Ended TTL Signals
  • Mini Modular Instrument for interfacing with High Speed Data Communications Equipment


  • 75 MHz Typical Maximum Clock Rate
  • Floating 124 Differential Inputs Accept RS-422, TTL, PECL, or LVPECL inputs
  • 4 Single-Ended 50 Ω Back-Terminated TTL Outputs deliver 2.5 V into 50 Ω or 5 V into Hi-Z, typical
  • SMA I/O Connectors
  • Single Supply operation, +7.5 VDC to +12 VDC
  • Ready-to-Use 1.3 x 2.9 x 2.9-in. Module includes a ±8.5 V/1.8 A AC/DC Adapter


The PRL-425QRT is a four channel, differential input receiver with single-ended 50 Ω TTL output line drivers. It is intended for converting differential signals transmitted through long lines into single-ended TTL outputs. The floating 124 Ω inputs are designed to be compatible with RS-422 or TTL differential input signals. They can also accept source-biased PECL or LVPECL inputs. The 50 Ω back-terminated TTL output line drivers can drive long lines with or without terminations, and they are designed specifically for use with high speed data communication applications. Fig. 1 shows the standard RS-422 input configuration. A functional block diagram of this device is shown in Fig. 2.

Each PRL-425QRT is supplied with a 8.5 V/1.8 A AC/DC Adapter, but it can also operate from a single positive power supply in the range of 7.5 V to 12 V. The PRL-425QRT is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure. Available accessories include TTL Fanout modules, voltage distribution modules, brackets for mounting multiple units, and a rackmount enclosure kit for rapid system integration.

Fig 1., LVDS Input Configuration
Fig 2. PRL-425QLT Block Diagram


Symbol Parameter Min Typ Max Unit Comments
RIND Differential Input Resistance 124 Ω
RINC Common Mode Input Resistance 5K Ω
IDC1 DC Input Current @ 50 MHz 265 280 mA
IDC2 DC Input Current @ 85 MHz 340 360 mA
VID Differential Input(1) V
VIA Single ended input(1) V
VCM Common Mode Input(1) -2.5 5.0 V
VDC DC Input Voltage 7.5 8.5 12.0 V
VAC AC/DC Adapter Input Voltage 103 115 127 V
VOHNL Output Hi Level, No Load 4.4 5.0 V RL=1 MΩ @ DC
VOHFL Output Hi Level, Full load 2.2 2.5 V RL=50 Ω @ DC
VOLNL Output Lo Level, No Load -0.1 0.0 0.4 V RL=1 MΩ @ DC
VOLFL Output Lo Level, Full Load -0.05 0.00 0.20 V RL=50 Ω @ DC
TPLH Propagation Delay to output ↑ 2.2 ns
TPHL Propagation Delay to output ↓ 2.2 ns
tr Rise Time (10%-90%) 1.8 2.5 ns
tf Fall Time (10%-90%) 1.8 2.5 ns
TSKEW Skew between any 2 outputs 250 600 ps
FMAX1 Max. Clock Frequency(2) 70 75 MHz
DTY Positive Duty Cycle @ 50 MHz 55 % ↑ Input
Size 1.3 x 2.9 x 2.9 in
Weight, excluding AC adapter 5 Oz
Shipping weight, Including AC adapter 4 lb

(1): See Fig. 1