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Measured from DC to 50 MHz. SFDR without harmonics at low amplitudes is limited by a –148 dBm/Hz noise floor. All values are typical and include aliased harmonics. Direct Low-Gain Amplifier High-Gain Amplifier 1 MHz –88 dBFS –91 dBFS –91 dBFS 10 MHz –87 dBFS –89 dBFS –91 dBFS 20 MHz –80 dBFS –89 dBFS –89 dBFS 30 MHz –73 dBFS –73 dBFS –74 dBFS 40 MHz –76 dBFS –73 dBFS –74 dBFS 43 MHz –78 dBFS –75 dBFS –60 dBFS NI 5421 Specifications 8 ni.com Table 1. (Continued) Table 1. (Continued) Value Comments Spectral Characteristics (Continued) 0 .C to 40 .C Total Harmonic Distortion (THD) Path Amplitude –1 dBFS. Includes the 2nd through the 6th harmonic. Direct Low-Gain Amplifier High-Gain Amplifier 20 kHz –77 dBc (typical) –77 dBc (typical) –77 dBc (typical) 1 MHz –75 dBc (typical) –70 dBc (typical) –62 dBc (typical) 5 MHz –68 dBc –68 dBc –55 dBc 10 MHz –65 dBc –61 dBc –46 dBc 20 MHz –55 dBc –53 dBc — 30 MHz –50 dBc –48 dBc — 40 MHz –48 dBc –46 dBc — 43 MHz –47 dBc –45 dBc — 0 .C to 55 .C Total Harmonic Distortion (THD) Path Amplitude –1 dBFS. Includes the 2nd through the 6th harmonic. Direct Low-Gain Amplifier High-Gain Amplifier 20 kHz –76 dBc (typical) –76 dBc (typical) –76 dBc (typical) 1 MHz –74 dBc (typical) –69 dBc (typical) –61 dBc (typical) 5 MHz –67 dBc –67 dBc –54 dBc 10 MHz –63 dBc –60 dBc –45 dBc 20 MHz –54 dBc –52 dBc — 30 MHz –48 dBc –46 dBc — 40 MHz –46 dBc –41 dBc — 43 MHz –45 dBc –41 dBc — © National Instruments Corporation 9 NI 5421 Specifications Table 1. (Continued) Table 1. (Continued) Value Comments Average Noise Density Path Amplitude Range Average Noise Density Average Noise Density at small amplitudes is limited by a –148 dBm/Hz noise floor. Vpk-pk dBm nV Hz ------- - -- dBm/Hz dBFS/ Hz Direct 1 4.0 18 –142 –146.0 Low Gain 0.06 –20.4 9 –148 –127.6 Low Gain 0.1 –16.0 9 –148 –132.0 Low Gain 0.4 –4.0 13 –145 –141.0 Low Gain 1 4.0 18 –142 –146.0 Low Gain 2 10.0 35 –136 –146.0 High Gain 4 16.0 71 –130 –146.0 High Gain 12 25.6 213 –120 –145.6 Intermodulation Distortion (IMD) Path Each tone is –7 dBFS. All values are typical.Direct Low-Gain Amplifier High-Gain Amplifier 10.2 MHz and 11.2 MHz –81 dBc –80 dBc –62 dBc 10.6 MHz and 10.8 MHz –81 dBc –79 dBc –61 dBc 19.5 MHz and 20.5 MHz –78 dBc –66 dBc –54 dBc 19.9 MHz and 20.1 MHz –78 dBc –65 dBc –50 dBc 34.0MHz and 35.0 MHz –75 dBc –58 dBc –51 dBc 34.8 MHz and 35.0 MHz –75 dBc –58 dBc –51 dBc 42.0 MHz and 43.0 MHz –75 dBc –55 dBc –51 dBc 42.8 MHz and 43.0 MHz –75 dBc –55 dBc –50 dBc NI 5421 Specifications 10 ni.com –90.0 –80.0 –50.0 –70.0 –40.0 –60.0 –30.0 –20.0 –10.0 0.0 10.0 dBm –90.0 –80.0 –50.0 –70.0 –40.0 –60.0 –30.0 –20.0 –10.0 0.0 10.0 dBm 0 25.0M 50.0M 75.0M 100.0M 125.0M 158.0M 175.0M 200.0M Frequency (Hz) Figure 3. 10 MHz Single-Tone Spectrum, Direct Path, 100 MS/s, Interpolation Factor Set to 4 Note The noise floor in Figure 3 is limited by the measurement device. Refer to the Average Noise Density specification. © National Instruments Corporation 11 NI 5421 Specifications –90.0 –80.0 –50.0 –70.0 –40.0 –60.0 –30.0 –20.0 –10.0 0.0 10.0 20.0 dBm –90.0 –80.0 –50.0 –70.0 –40.0 –60.0 –30.0 –20.0 –10.0 0.0 10.0 20.0 dBm 0 25.0M 50.0M 75.0M 100.0M 125.0M 150.0M 175.0M 200.0M Frequency (Hz) Figure 4. 10 MHz Single-Tone Spectrum, Low-Gain Amplifier Path, 100 MS/s, Interpolation Factor Set to 4 Note The noise floor in Figure 4 is limited by the measurement device. Refer to the Average Noise Density specification. NI 5421 Specifications 12 ni.com –90.0 –80.0 –50.0 –70.0 –40.0 –60.0 –30.0 –20.0 –10.0 0.0 10.0 dBm –90.0 –80.0 –50.0 –70.0 –40.0 –60.0 –30.0 –20.0 –10.0 0.0 10.0 dBm 0 25.0M 50.0M 75.0M 100.0M 125.0M 150.0M 175.0M 200.0M Frequency (Hz) Figure 5. Direct Path, 2-Tone Spectrum (Typical) Note The noise floor in Figure 5 is limited by the measurement device. Refer to the Average Noise Density specification. © National Instruments Corporation 13 NI 5421 Specifications Sample Clock Table 2. Specification Value Comments Sources 1. Internal, Divide-by-N (N . 1) 2. Internal, DDS-based, High-Resolution 3. External, CLK IN (SMB front panel connector) 4. External, DDC CLK IN (DIGITAL DATA & CONTROL front panel connector) 5. NI PXI-5421: External, PXI Star trigger (backplane connector) 6. NI PXI-5421: External, PXI_Trig<0..7> (backplane connector) NI PCI-5421: External, RTSI<0..7> Refer to the Onboard Clock section for more information about Internal Clock Sources. Sample Rate Range and Resolution Sample Clock Source Sample Rate Range Sample Rate Resolution — Divide-by-N 23.84 S/s to 100 MS/s Settable to (100 MS/s) / N (1 . N . 4,194,304) High Resolution 10 S/s to 100 MS/s 1.06 .Hz CLK IN 200 kS/s to 105 MS/s Resolution determined by external clock source. External Sample Clock duty cycle tolerance 40% to 60%. DDC CLK IN 10 S/s to 105 MS/s NI PXI-5421 PXI Star Trigger 10 S/s to 105 MS/s NI PXI-5421 PXI_Trig<0..7> 10 S/s to 20 MS/s NI PCI-5421 RTSI<0..7> 10 S/s to 20 MS/s NI 5421 Specifications 14 ni.com Table 2. (Continued) Table 2. (Continued) Value Com...

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