Datasheet

AD7440/AD7450A
Rev. C | Page 11 of 28
Power Supply Rejection Ratio (PSRR)
The power supply rejection ratio is the ratio of the power in
the ADC output at full-scale frequency, f, to the power of a
100 mV p-p sine wave applied to the ADC V
DD
supply of
frequency f
S
. The frequency of this input varies from 1 kHz to
1 MHz.
PSRR (dB) = 10log(Pf/Pf
S
)
Pf is the power at frequency f in the ADC output; Pfs is the
power at frequency f
S
in the ADC output.