Sine spectral purity, Filter characteristics – National Instruments PXI NI 5401 User Manual

Page 40

Appendix A

Specifications

A-2

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Pre-attenuation offset

Range...............................................±2.5 V into 50

Ω

Accuracy..........................................±5 mV

Output coupling .....................................DC

Output impedance ..................................50

Ω

75 Ω

software selectable

Load impedance .....................................50

Ω

or greater

Output enable..........................................Software switchable

Protection................................................Short-circuit protected

Sine Spectral Purity

Harmonic products and spurs

Up to 1 MHz....................................–60 dBc

Up to 16 MHz..................................–35 dBc

Phase noise .............................................–105 dBc/Hz at 10 kHz from

carrier

Filter Characteristics

Digital

Type .................................................Half-band interpolating

Selection ..........................................Software switchable (enable or

disable)

Taps ................................................67

Filter coefficients ............................Fixed 20-bit

Data interpolating frequency ..........80 MS/s

Pipeline signal delay .......................26 sampling periods

Analog

Type .................................................7th-order L-C lowpass filter

Passband ripple ................................±2 dB

With less than 10 dB of attenuation, signal maximum plus offset (before attenuation) must not exceed ±5 V (into 50

Ω)