PXI RF Signal Conditioning
NI PXI-5691 Specifications
Channel 0 (CH 0) Performance, Main Path
Level calibration accuracy.....................
Absolute maximum input power
(no damage) ......................................
Maximum reverse power
(no damage) ......................................
Maximum output power
(no damage) ......................................
DC voltage at input ...............................
Gain variation by temperature ..............
1
Channel 1 (CH 1) Performance, Main Path
Variable level range ..............................
Attenuation resolution ..........................
Level settling time.................................
Level calibration accuracy.....................
Absolute maximum input power
(no damage) ......................................
Maximum reverse power
(no damage) ......................................
Maximum output power........................
DC voltage at input ...............................
Gain variation by temperature ..............
1
+31.5 dB
+0.5 dB typical
+4 μs maximum
1
±0.9 dB
2
+30 dBm typical
(7.1 V
rms
, 10 V
pk
at 50 Ω)
+20 dBm maximum
+25 dBm maximum
±10 V typical
(-1.34*10
-12
*
F
) – 0.01 in dB/°C
3
F
= Frequency in Hz
±0.9 dB
1
+30 dBm typical
(7.1 V
rms
, 10 V pk at 50 Ω)
+20 dBm maximum
+25 dBm maximum
±10 V typical
2
(-1.18*10 *
F
) – 0.01 in dB/°C
F
= Frequency in Hz
-12
3
Valid for T
ref
±5 °C. For temperatures other than T
ref
, the level calibration accuracy is valid after
applying the gain correction factor for
Δ T.
2
DC coupled from input to output, but only calibrated from 50 MHz to 8 GHz.
3
Calculate the correction factor using the following equation:
Δ Gain = (Gain Variation by temperature) * Δ
T
where
Δ T = T
sensor
– T
ref
T
sensor
= the temperature reading of the onboard temperature sensor in °C, as reported by
the ni5690 Get Temperature VI or the ni5690_getTemperature function T
ref
= 34 °C
36.0
34.0
32.0
30.0
Max
Typical
Min
The attenuator settling time is measured to 0.5 dB of final value when switching from minimum
to maximum attenuation. Achieving settling times closer to the final attenuation value may take
substantially longer.
2
Valid for T
ref
±5 °C. For temperatures other than T
ref
, the level calibration accuracy is valid after
applying the gain correction factor for
Δ T.
3
Calculate the correction factor using the following equation:
Δ Gain = (Gain Variation by temperature) * Δ
T
where
Δ T = T
sensor
– T
ref
T
sensor
= the temperature reading of the onboard temperature sensor in °C, as reported by
the ni5690 Get Temperature VI or the ni5690_getTemperature function T
ref
= 34 °C
35.0
30.0
Gain (dB)
25.0
20.0
15.0
10.0
5.0
0.0
–5.0
0.0
2.0
4.0
6.0
8.0
28.0
26.0
24.0
Gain (dB)
–10.0
–15.0
–20.0
0.0
2.0
4.0
Max Gain
Min Gain
Limits
Frequency (GHz)
Figure 9. Measured Gain
11.0
10.0
9.0
8.0
7.0
6.0
8.0
Frequency (GHz)
Figure 11. Measured Programmable Gain Range
NF (dB)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
10
50
100
1000
8000
Max
Typical
Frequency (MHz)
Figure 10. Measured Noise Figure
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