CS5012A, CS5014, CS5016
PARAMETER DEFINITIONS
Linearity Error
The deviation of a code from a straight line passing through the endpoints of the transfer
function after zero- and full-scale errors have been accounted for. "Zero-scale" is a point 1/2 LSB
below the first code transition and "full-scale" is a point 1/2 LSB beyond the code transition to
all ones. The deviation is measured from the middle of each particular code. Units in %
Full-Scale.
Differential Linearity
Minimum resolution for which no missing codes is guaranteed. Units in bits.
Full Scale Error
The deviation of the last code transition from the ideal (VREF-3/2 LSB’s).
Units in LSB’s.
Unipolar Offset
The deviation of the first code transition from the ideal (1/2 LSB above AGND) when in
unipolar mode (BP/UP low). Units in LSB’s.
Bipolar Offset
The deviation of the mid-scale transition (011...111 to 100...000) from the ideal (1/2 LSB below
AGND) when in bipolar mode (BP/UP high). Units in LSB’s.
Bipolar Negative Full-Scale Error
The deviation of the first code transition from the ideal when in bipolar mode (BP/UP high). The
ideal is defined as lying on a straight line which passes through the final and mid-scale code
transitions. Units in LSB’s.
Peak Harmonic or Spurious Noise (More accurately, Signal to Peak Harmonic or Spurious Noise)
The ratio of the rms value of the signal to the rms value of the next largest spectral component
below the Nyquist rate (excepting dc). This component is often an aliased harmonic when the
signal frequency is a significant proportion of the sampling rate. Expressed in decibels.
Total Harmonic Distortion
The ratio of the rms sum of all harmonics to the rms value of the signal. Units in percent.
Signal-to-Noise Ratio
The ratio of the rms value of the signal to the rms sum of all other spectral components below
the Nyquist rate (excepting dc), including distortion components. Expressed in decibels.
Aperture Time
The time required after the hold command for the sampling switch to open fully. Effectively a
sampling delay which can be nulled by advancing the sampling signal. Units in nanoseconds.
Aperture Jitter
The range of variation in the aperture time. Effectively the "sampling window" which ultimately
dictates the maximum input signal slew rate acceptable for a given accuracy. Units in
picoseconds.
NOTE: Temperatures specified define ambient conditions in free-air during test and do not refer to the junction
temperature of the device.
2-44
DS14F6
CIRRUS [ CIRRUS LOGIC ]
