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ADS5440 Datasheet

  • ADS5440

  • 13 位 210MSPS 管道 ADC

  • 1016.06KB

  • 24页

  • TI

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ADS5440
SLAS467 鈥?JULY 2005
www.ti.com
DEFINITION OF SPECIFICATIONS (continued)
Signal-to-Noise and Distortion (SINAD)
SINAD is the ratio of the power of the fundamental (P
S
) to the power of all the other
spectral components including noise (P
N
) and distortion (P
D
), but excluding dc.
SINAD
+
10log
(2)
SINAD is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the
reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter鈥檚
full-scale range.
Effective Resolution Bandwidth
The highest input frequency where the SNR (dB) is dropped by 3 dB for a full-scale input
amplitude.
Total Harmonic Distortion (THD)
THD is the ratio of the power of the fundamental (P
S
) to the power of the first five
harmonics (P
D
).
S
10 P
)
P
N
D
P
P
THD
+
10log
10 P
S
D
(3)
THD is typically given in units of dBc (dB to carrier).
Two-Tone Intermodulation Distortion
IMD3 is the ratio of the power of the fundamental (at frequencies f
1
, f
2
) to the power
of the worst spectral component at either frequency 2f
1
鈥?f
2
or 2f
2
鈥?f
1
). IMD3 is either given in units of dBc (dB
to carrier) when the absolute power of the fundamental is used as the reference or dBFS (dB to full scale)
when the power of the fundamental is extrapolated to the converter鈥檚 full-scale range.
PRODUCT PREVIEW
8

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