TTL Square Wave CLK Generator with 2-Phase Complementary Outputs

SKU:

$ 2,297.70

Quantity

Item	Description
88000102-4	Cable, triple voltage, with modular plugs, Length in ft.
88000103-4	Cable, triple voltage, with modular plug and pig tail leads, Length in ft.

Product Description
Diagrams
Applications
Specifications
Documents

Applications:

System Clock Simulation
Split-Cycle Timing
Low Jitter TTL Clock Sources
Large Signal Amplifier Response Testing
Filter Testing
Two-Phase Clock Simulation
Square Wave and Sine Wave Generation
Essential Lab Tool for Working with TTL Circuits

Features:

V_O typically = 5 V into 1 MΩ or 2.5 V into 50 Ω
750 ps output t_R/t_F typical
2φ complementary TTL square wave outputs
φ1 output variable from < 12.5 MHz to > 200 MHz
φ2 output variable from < 6.25 MHz to > 100 MHz
50 Ω back-terminated outputs suitable for driving long lines without load terminations for f_O < 70 MHz
Frequency jitter < 20 ps, and short term ∆f < 0.1% and < 0.05% when controlled by an external precision DC source
Four DC-coupled outputs with SMA Connectors
BNC input connector for external voltage tuning
Ready-to-Use 1.3 x 2.9 x 5.1-in. module includes a 8.5 V/±1.4 A, 17 V/150 mA AC/DC Adapter

Description

The PRL‑177A is a 2φ, TTL clock generator with two pairs of complementary 50 Ω back-terminated outputs. The internal VCO clock frequency f_O is continuously variable over one octave, from less than 100 MHz to greater than 200 MHz, controlled by a 10-turn pot, for the 200 MHz model (PRL-177A-200; other VCO frequencies are also available). The VCO frequency can also be controlled over the same range using an external 0-16 V voltage source. The buffered VCO output f_Ois connected to two independent 2-bit dividers for generating the 2φ outputs. φ1 divides f_O by 1, 2, 4 or 8, and provides output frequencies from less than 12.5 MHz to greater than 200 MHz. φ2 divides f_O by 2, 4, 8 or 16, and provides output frequencies from less than 6.25 MHz to greater than 100 MHz. Except for the f_O/1 outputs from φ1 (D0 = D1 = 00), all outputs are nearly perfect square waves, as they are derived from outputs of binary dividers. The duty cycle of the f_O/1 output is typically better than 55%/45%.

The PRL‑177A‑200 is a Mini Modular Instrument (MMI) designed for everyday lab use. It is also a stable, low-jitter frequency source, covering the frequency range from less than 6.25 MHz to greater than 200 MHz. Its outputs (5 V/open circuit or 2.5 V/50 Ω) are ideally suited for testing CMOS/TTL circuits, amplifiers, discrete semiconductor devices, filters and other passive components, etc. The two sets of independent, complementary outputs are useful for split-cycle timing applications, sequential address simulation and for scope triggering or frequency monitoring using a counter. The PRL‑177A‑200 can also generate sine waves when used with a 7-pole low-pass Chebyshev filter built from a PRL Signal Conditioning Kit. The output waveforms are shown in Figs. 6 and 7, where 10 MHz and 5.2 MHz square waves are converted into sine waves (2.4 V_PP) using the same filter. More information and links to filter calculators are available here.

With its clean, sub-ns rise-time and precision 50 Ω back-terminated outputs, the PRL‑177A‑200 is also an ideal TDR signal generator when used with the PRL‑812‑TDR passive splitter. This type of simple TDR generator is very affordable, and is well suited for testing cable impedance and for measuring biased input terminations that cannot be measured using a DVM. It can also replace expensive and cumbersome pulse generators, occupying less than 20 square inches of bench space, in applications where simple clock signals are needed. With the addition of a DC block, the PRL‑177A‑200 outputs can be converted into a ±1.25 V bipolar output for testing amplifiers.

The PRL‑177A‑200 is housed in a 1.3 x 2.9 x 5.1‑in. extruded aluminum enclosure and is supplied with a ±8.5 V, +17 V AC/DC Adapter.

PRL-177A-200 Block Diagram

Fig. 2: All outputs @ 25 MHz

Fig. 3: All outputs @ 50 MHz

Fig. 4: All outputs @ 100 MHz

Fig. 5: Q1/Q1 @ 215 MHz, Q2/Q2 @ 100 MHz

Fig. 6: 10 MHz Square wave to Sine wave conversion

Fig. 7: The same filter is usable down to 5.14 MHz

Fig. 8: TDR output waveform with an open line termination

Fig. 9: TDR output waveform with a high quality, wideband 50 Ω termination

Fig. 10: TDR output waveform with 50 Ω termination having a small // capacitive component

Fig. 11: TDR output waveform with an open ended 6 dB attenuator (83.3 Ω)

Fig. 12: The incident wave, C2, shows a rise time of 776 ps

Fig. 13: The reflected wave, C2, shows a rise time of 809 ps

(0° C ≤ T_A ≤ 35° C)*

SYMBOL	PARAMETER	Min	Typ	Max	UNIT	Comments
I_DC1	DC Input Current, +8.5 V*		+320	+335	mA
I_DC2	DC Input Current, -8.5 V*		-410	-430	mA
I_DC3	DC Input Current +17 V*		30	35	mA
V_DC1	External DC Input Voltage 1	+7.5	+8.5	+12	V
V_DC2	External DC Input Voltage 2	-12.0	-8.5	-7.5	V
V_DC3	External DC Input Voltage 3	+19.0	+20.0	+22.0	V
V_AC	AC Adapter Input Voltage	103	115	127	V
V_OH1	Output Hi Level f ≤ 25 MHz		5		V	R_L= 1 MΩ
V_OH2	Output Hi Level 6.25 MHz ≤ f ≤ 200 MHz	2.4	2.5		V	R_L= 50 Ω
V_OL1	Output Lo Level f ≤ 25 MHz	-0.2	0	0.2	V	R_L= 1 MΩ
V_OL2	Output Lo Level 6.25 MHz ≤ f ≤ 200 MHz	-0.15	0	0.15	V	R_L= 50 Ω
t_R/t_F	Rise/Fall Times (10%-90%), all outputs		750	850	ps	@ 100 MHz
DC1	Q1 Duty Cycle @ 100 MHz, D0 = D1 = 00		55	60	%
DC2	Duty Cycle, All Outputs, (D0 ≠ 0 \|\| D1 ≠ 00)		50		%
VCO f_MAX	Internal VCO maximum frequency	200	214		MHz	D0 = D1 = 00
VCO f_MIN	Internal VCO minimum frequency	100	86		MHz	D0 = D1 = 00
f_MAXφ1	φ1 Output maximum frequency	200	214		MHz	D0 = D1 = 00
f_{MIN φ1}	φ1 Output minimum frequency	12.50	10.75		MHz	D0 = D1 = 11
f_MAXφ2	φ2 Output maximum frequency	100	107		MHz	D2 = D3 = 00
f_{MIN φ2}	φ2 Output minimum frequency	6.250	5.375		MHz	D2 = D3 = 11
t_SKEW1	Skew ↔ Q1 and Q1		100	250	ps	f = 100 MHz
t_SKEW2	Skew ↔ Q2 and Q2		100	250	ps	f = 100 MHz
t_SKEW3	Skew ↔ Q1 and Q2		200	300	ps	f = 100 MHz
Δf	1 Hr. Frequency Stability, 23 °C ≤ T_A ≤ 25 °C		0.1		%	1 hr warm up
JPPKPK	Period Jitter, peak to peak		20	40	ps
	Enclosure Size	1.3 x 2.9 x 5.1			in.
	Weight, excluding AC adapter		8		Oz
	Shipping weight, including AC adapter		4		lb.

Notes:

*All dynamic measurements are made with outputs terminated into 50 Ω, unless otherwise specified.

*These are the specified, fully loaded, unregulated output voltages from the PRL-760C AC adapter. For non-fully loaded conditions, these voltages may be ±10 V and +20 V.

PDF Datasheet