PXI-5404 datasheet(2/6 Pages) NI

2 / 6 page

Programmable Clock Output Levels for TTL/CMOS

The PXI-5404 has programmable voltage output levels of 5, 3.3,

and 1.8 V into high impedance loads and 2.5, 1.65, and 0.9 V into

a 50

Ω load. With the flexible clock output levels, the PXI-5404 can

address both TTL and CMOS technologies thereby making it an

attractive clock source for ATE systems. Additionally an external

DC blocking capacitor can be used to shift the outputs to other

popular logic levels such as LVPECL and PECL.

Superior Leveled Sine Output Accuracy

The

PXI-5404

employs

onboard

amplitude-leveling

compensation scheme whereby the specified output level enjoys

excellent accuracy of ±0.2 dB within the passband of 9 kHz to

100 MHz. In Figures 2 and 3 the effects of the output leveling

technique can be seen clearly. This level accuracy makes the

PXI-5404 an ideal source for many applications such as

communications and ATE, where amplitude accuracy is a

key requirement.

Phase-Lock Loop for Synchronization

The phase-lock loop on the PXI-5404 synchronizes sine and clock

generation to an external clock. The reference clock source may

come from the front panel connector CLK IN, the PXI 10 MHz

reference clock on the PXI backplane, or the PXI trigger bus.

The PXI-5404 phase-locks to frequencies from 3 to 20 MHz in

1 MHz increments. The PXI-5404 can also operate without an

external

reference

frequency

using

its

onboard

frequency source.

Using phase-lock loops, you can synchronize two or more

PXI-5404 sources to within 0.022 deg in phase for outputs up to

100 MHz. Consequently, you can build a high-performance

multichannel source on the PXI platform. Thus, with the PXI-5404

you can address applications such as in automotive and video test

that require multiple clock frequencies that are phase locked in

precise phase relationships.

Triggering

The sine and clock outputs can run continuously or you can use

triggering controls to start sine and clock generation. Trigger

sources can be either external or internal (software trigger).

External triggers can be received from the front panel connector

PFI0, the PXI trigger bus, or the PXI star trigger bus. You can also

change the operating frequency, amplitude, and phase of the

PXI-5404 output from one of these sources.

Calibration

Every PXI-5404 is factory calibrated and shipped with a calibration

certificate verifying that it meets NIST-traceable standards.

Periodically, you can externally calibrate the PXI-5404 (provided

you have the expertise and equipment), or you can ship it to

National

Instruments

qualified

metrology

lab.

External

calibration

usually

performed

annual

basis. Visit ni.com/calibration for more information about

calibration services.

I/O Connector

The PXI-5404 has five SMB connectors labeled SINE, CLOCK,

REF IN, REF OUT, and PFI0. The sine and clock outputs are

accessed on SINE and CLOCK, respectively, and an external

reference frequency for the phase-lock loop is fed to the REF IN

connector. The REF OUT connector is a truly versatile output

connector that can route out a signal from multiple sources,

including the onboard VCXO reference (divided by 1 to 255), the

star trigger bus, the PXI trigger bus, PFI0 connector, and the PXI

10 MHz reference clock. The PFI0 connector is a bidirectional

connector. As an input, the PFI0 connector can accept a trigger

that initiates sine and clock generation from an external source.

As an output, the PFI0 connector can route out the same set of

signals as the REF OUT connector.

100 MHz Frequency Generator

2 National Instruments • Tel: (800) 433-3488 • Fax: (512) 683-9300 • info@ni.com • ni.com

10.6

10.4

10.2

9.8

9.6

9.4

9.2

100

120

Frequency (MHz)

Figure 2. NI PXI-5404 Passband Flatness without Onboard Compensation

10.6

10.4

10.2

9.8

9.6

9.4

9.2

100

120

Frequency (MHz)

Figure 3. NI PXI-5404 Passband Flatness with Onboard Compensation

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