2 Ch. Translator, PECL to TTL

Applications:

• Converting Single Ended or Differential PECL Signals to TTL Signals
• High Speed Digital Communications Systems Testing
• High Speed SONET Clock Level Translation

Features:

• f_max > 300 MHz
• 1.1 ns Typical Output Rise & Fall Times
• 50 Ω/+3 V Input for PECL
• Single Ended or Differential Inputs.
• Complementary 50 Ω TTL Level Outputs
• SMA I/O Connectors
• Self-contained 1.3 x 2.9 x 3.9-in. unit including AC/DC Adapter

Description

The PRL-450PD logic translator converts PECL signals to TTL signals. It can receive either single ended or differential input signals, selected by a switch. The outputs of these translators have 50 Ω back terminations, and, therefore, they can drive 50 Ω terminated or unterminated lines. These high speed translators facilitate testing of high speed digital communications circuits, where conversion of PECL clock and data signals to TTL level signals is often required.

The PRL-450PD is designed to interface with PECL circuits operating with a +5 V supply.

In the differential input mode, both inputs D and D of the PRL-450PD are terminated into 50 Ω/+3 V. In this mode, either one or both inputs can accept AC coupled signals as well.

In the single input mode, signals should be connected to the D inputs only. The D inputs are switched internally to V_BB, nominally +3.7. The termination resistors, R_T, for the D input channels are changed to 62 Ω.

Each unit is supplied with a ±8.5 V AC/DC Adapter and housed in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure.