Characteristic Specifications Supplemental Information
APx DIO Module for B Series: Specifications 53
DIO
Sine Characteristics
Frequency Range 5 Hz to 0.499 • SR
Flatness
1
Typically < 0.001 dB
Offset Range To maximum digital code [±1D] Offset limits maximum ac signal
Harmonics & Spurious
1
Typically < –140 dBFS
Square Characteristics
Frequency Range (Fq) 10 Hz to SR / 6 Fq must equal SR / N where N is an
even integer 6.
Even Harmonic,
Spurious Content
Typically < –140 dBFS
Noise Characteristics
Shape White (<5 Hz to 0.499 • SR),
Pink (<10 Hz to 0.45 • SR),
IEC 60268-1 or BS EN 50332-1
IEC 60268-1 is shaped pink noise.
BS EN 50332-1 is similar, but with soft
clipping to limit crest factor to 2.
IMD Test Signals
SMPTE & MOD
Lower Frequency (LF) 40 Hz to 1.00 kHz LF tone must be 1/6 • HF tone.
SMPTE Upper Frequency (HF) 2 kHz to (0.499 • SR) or 60 kHz,
whichever is lower
MOD Upper Frequency (HF) 240 Hz to (0.499 • SR) or 60 kHz,
whichever is lower
Mix Ratio (LF:HF) 10:1, 4:1 or 1:1
Residual IMD
1
Typically < –140 dBFS
DFD & CCIF
Difference Frequency (Fdiff) 80 Hz to 2.0 kHz F
mean
= (F1 + F2)/2
Mean Frequency (Fmean) 2.5 kHz to (0.499 • SR – F
diff
/ 2) or
60 kHz, whichever is lower
F
diff
= |F2-F1|;
F
mean
must be 6 • Fdiff
Residual IMD
1
Typically < –150 dBFS
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