Datasheet

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THD + 10Log
10
P
S
P
D
(4)
Production Data
ADS5541
SBAS307C MAY 2004 REVISED FEBRUARY 2007
Total Harmonic Distortion (THD) Reference Error
THD is the ratio of the power of the fundamental (P
S
) The reference error is the variation of the actual
to the power of the first eight harmonics (P
D
). reference voltage (VREFP VREFM) from its ideal
value. The reference error is typically given as a
percentage.
Voltage Overload Recovery Time
THD is typically given in units of dBc (dB to carrier).
The voltage overload recovery time is defined as the
Spurious-Free Dynamic Range (SFDR)
time required for the ADC to recover to within 1% of
the full-scale range in response to an input voltage
The ratio of the power of the fundamental to the
overload of 10% beyond the full-scale range.
highest other spectral component (either spur or
harmonic). SFDR is typically given in units of dBc
AC Power-Supply Rejection Ratio (AC PSRR)
(dB to carrier).
The ratio of output spectral power at a given
Two-Tone Intermodulation Distortion (IMD3)
frequency with respect to the injected ac-power on
AV
DD
at that frequency. The rejected ac-input
IMD3 is the ratio of the power of the fundamental (at
amplitude should be limited to less than 100mV
PP
.
frequencies f
1
and f
2
) to the power of the worst
The PSRR is typically given in units of dB.
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)
when the power of the fundamental is extrapolated to
the converter full-scale range.
DC Power-Supply Rejection Ration (DC PSRR)
The DC PSSR is the ratio of the change in offset
error to a change in analog supply voltage. The DC
PSRR is typically given in units of mV/V.
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