Datasheet

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THD + 10Log
10
P
S
P
D
ADS5542
SBAS308D – MAY 2004 – REVISED FEBRUARY 2007
Total Harmonic Distortion (THD) Two-Tone Intermodulation Distortion (IMD3)
THD is the ratio of the power of the fundamental (P
S
) IMD3 is the ratio of the power of the fundamental (at
to the power of the first eight harmonics (P
D
). frequencies f
1
and f
2
) to the power of the worst
spectral component at either frequency 2f
1
– f
2
or
2f
2
– 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)
THD is typically given in units of dBc (dB to carrier).
when the power of the fundamental is extrapolated to
Spurious-Free Dynamic Range (SFDR)
the converter's full-scale range.
The ratio of the power of the fundamental to the
DC Power Supply Rejection Ration (DC PSRR)
highest other spectral component (either spur or
The DC PSSR is the ratio of the change in offset
harmonic). SFDR is typically given in units of dBc
error to a change in analog supply voltage. The DC
(dB to carrier).
PSRR is typically given in units of mV/V.
Reference Error
The reference error is the variation of the actual
reference voltage (VREFP - VREFM) from its ideal
value. The reference error is typically given as a
percentage.
Voltage Overload Recovery Time
The voltage overload recovery time is defined as the
time required for the ADC to recover to within 1% of
the full-scale range in response to an input voltage
overload of 10% beyond the full-scale range.
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