NI PXI-5621 SPECIFICATIONS
High-Speed Digitizer
The NI PXI-5621 is a DC-coupled 64 MS/s 14-bit high-speed digitizer.
Except for its DC coupling, the PXI-5621 is functionally identical to the
PXI-5620. Refer to the NI PXI-562x User Manual for instructions on
installing and using your NI PXI-5621.
The NI PXI-5621 specifications are warranted at 0–50 °C ambient unless
otherwise specified, and include a 10 minute warm-up time from ambient
conditions.
General Specifications
Number of channels ............................... 1
Resolution .............................................. 14 bits
Sample rate range...................................1 kS/s to 64 MS/s
Onboard memory
Not using DDC ............................... 32 MS
Using DDC (complex data) ............ 16 MS
Input
Signal level
Nominal .......................................... 0 dBm (±0.316 V
Full-scale......................................... +10 dBm (±1.000 V
Max with dither enabled ................. +8 dBm (±0.794 V
Non-operating
Max input level........................ +20 dBm (±3.16 V
Max DC input voltage ............. ±3.0 V
Input impedance..................................... 50 Ω nominal
Coupling................................................. DC
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323398B-01
Frequency
DC offset.................................................±1 mV (calibrated)
Analog bandwidth (–3 dB range) ...........0 Hz to 36 MHz
Amplitude accuracy................................±0.5 dB
VSWR
0–25 MHz........................................<1.5:1
25–32 MHz......................................<3:1
Dither (can be disabled)
Frequency range ..............................150 Hz to 4 MHz
Internal sample clock
Frequency ........................................64 MHz/ n, where 1 < n < 2
Accuracy..........................................<±25 ppm
Phase noise
Offset Density
100 Hz <–100 dBc/Hz
1 kHz <–120 dBc/Hz
16
10 kHz <–130 dBc/Hz
100 kHz <–130 dBc/Hz
Residual FM ...........................................<2 Hz
NI PXI-5621 Specifications 2 ni.com
pk–pk
in 10 ms
Amplitude
Amplitude (dBm)
Typical Results
–70.00
–80.00
–90.00
–100.00
–110.00
–120.00
–130.00
–140.00
0.0 5.0M 20.0M 25.0M 32.0M
15.0M10.0M
Frequency (Hz)
Figure 1. Noise Density (Dither Disabled, Input Terminated)
Average noise density
(dither off) .............................................. < –129 dBm/Hz
Signal-to-noise ratio
9 dBm signal, full bandwidth.......... >62 dB
Harmonic distortion (single tone, 0 dBm signal;
includes aliased harmonic distortion)
4–15 MHz, dither enabled .............. < –77 dBm
0–32 MHz, dither disabled.............. <–71 dBm
© National Instruments Corporation 3 NI PXI-5621 Specifications
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