PRL-174NT NECL/TLL Programmable VCO Clock Source (Discontinued)

The PRL-174NT has been replaced by the new PRL-174ANT. We are no longer taking orders for the PRL-174NT. Information contained on these pages is for information only.

Migration information:

• The PRL-174ANT provides equivalent or superior functionality to the PRL-174NT except that it is guaranteed to run only up to 1.35 GHz.
• The PRL-174ANT provides a 16-position "range" switch plus a 10-turn pot (vs. only a single-turn pot for the PRL-174NT), thus providing 160x the effective resolution of the older model. It is now possible to set frequencies much more accurately than before.
• The PRL-174ANT also provides superior stability vs. the PRL-174NT. 
• Please contact support@pulseresearchlab.com for application migration support.

Mini Modular Instruments > Clock Sources > PRL-174NT

Applications:

• System clock simulation
• Low jitter NECL and TTL  clock source
• SONET clock generator
• A Mini Modular Instrument for working with TTL/NECL circuits

Features:

• Internal VCO Clock source variable from 700 MHz to 1.4 GHz
• Other frequencies available by quote.
• f/1 to f/256 Complementary Outputs, 8-Bit Manually programmable
• Bit-9 extends division to f/512 for square wave outputs
• NECL f and f Outputs
• NECL and TTL f/n and f/n Outputs
• 15 ps typical Edge Jitter
• 30 ps typical skew between f/n & NECL outputs and 500 ps between f/n & TTL outputs
• Complementary NECL/TTL Outputs drive 50 Ω loads
• DC coupled Outputs with SMA Connectors
• Ready-to-Use 1.3 x 2.9 x 8-in. Module includes AC/DC Adapter

Description

The PRL-174NT-1400 is a manually programmable clock source module. The internal VCO clock frequency f, variable from 700 MHz to 1.4 GHz, is divisible from 2 to 256, inclusive, using D1 through D8 of a 9-position DIP switch. D9 further divides the f/n outputs by 2, extending the maximum division to 512, and providing square wave outputs. A table showing all the possible division ratios is provided in the datasheet. The internal VCO frequency is continuously variable over one octave range using a front panel control. Standard maximum VCO frequency is 1.4 GHz. Other VCO frequencies are available on special order. 

The PRL-174NT-1400 has complementary NECL f/1 outputs and complementary NECL and TTL f/n outputs. The NECL outputs are designed for driving 50 Ω loads terminated into -2 V, and they can also drive AC coupled or floating 50 Ω loads. The 50 Ω back-terminated TTL outputs can drive long 50 Ω lines with or without 50 Ω terminations. PECL or LVPECL f/n outputs are available (instead of TTL) by special order.

Applications of the PRL-174NT-1400 include precision clocks for high speed digital systems, low jitter clock source for testing A/D's, SONET Clock generator, and Mini Modular Instrument for working with high speed NECL and TTL/CMOS circuits.

The PRL-174NT is housed in a 1.3 x 2.9 x 8-in. extruded aluminum enclosure and is supplied with a ±8.5 V, +17 V AC/DC Adapter.

Related and Complementary Products:

• PRL-414B, 1:4 TTL Fanout Buffer
• PRL-431N/P, 1:2 NECL/PECL Fanout Buffer
• PRL-550 Series, NECL/PECL Terminators/Translators
• PRL-470A, Variable Output Pulse Driver

Accessories

• PRL-SC-104, DC Block, 0.1 µf
• PRL-SC-225, DC Block, 2.2 µf
• PRL-FTC-104, Feedthru Decoupling Cap, 0.1 µf
• PRL-FTR-50, Feedthru 50 Ω Termination
• PRL-ACT-50, Dual Ch. AC Coupled 50 Ω Termination 
• PRL-ACX-12dB, AC Coupled 12dB (4X) Attenuator
• Mounting Brackets, for mounting to flat surfaces
• Voltage Distribution Modules, for sharing AC adapters among multiple modules
• Cables, various lengths of RG-174 50 Ω coax with SMA plugs

Detail | Diagram | Specifications | Datasheet | DivisorTable.xls