AD10465
DEFINITION OF SPECIFICATIONS
Analog Bandwidth
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by the FFT analysis) is
reduced by 3 dB.
Overvoltage Recovery Time
The amount of time required for the converter to recover to
0.02% accuracy after an analog input signal of the specified
percentage of full scale is reduced to midscale.
Power Supply Rejection Ratio
Aperture Delay
The delay between a differential crossing of ENCODE and
ENCODE and the instant at which the analog input is sampled.
The ratio of a change in input offset voltage to a change in power
supply voltage.
Signal-to-Noise-and-Distortion (SINAD)
Aperture Uncertainty (Jitter)
The sample-to-sample variation in aperture delay.
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral compo-
nents, including harmonics but excluding dc. May be reported
in dB (i.e., relative to signal level) or in dBFS (always related
back to converter full scale).
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
Encode Pulsewidth/Duty Cycle
Signal-to-Noise Ratio (without Harmonics)
Pulsewidth high is the minimum amount of time that the
ENCODE pulse should be left in Logic “1” state to achieve
rated performance; pulsewidth low is the minimum time
ENCODE pulse should be left in low state. At a given clock
rate, these specs define an acceptable Encode duty cycle.
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral compo-
nents, excluding the first five harmonics and dc. May be reported
in dB (i.e., relative to signal level) or in dBFS (always related
back to converter full scale).
Harmonic Distortion
The ratio of the rms signal amplitude to the rms value of the
worst harmonic component.
Spurious-Free Dynamic Range
The ratio of the rms signal amplitude to the rms value of the
peak spurious spectral component. The peak spurious compo-
nent may or may not be a harmonic.
Integral Nonlinearity
The deviation of the transfer function from a reference line
measured in fractions of 1 LSB using a “best straight line”
determined by a least square curve fit.
Transient Response
The time required for the converter to achieve 0.03% accu-
racy when a one-half full-scale step function is applied to the
analog input.
Minimum Conversion Rate
The encode rate at which the SNR of the lowest analog signal
frequency drops by no more than 3 dB below the guaranteed limit.
Two-Tone Intermodulation Distortion Rejection
The ratio of the rms value of either input tone to the rms value of
the worst third order intermodulation product; reported in dBFS.
Maximum Conversion Rate
The encode rate at which parametric testing is performed,
above which converter performance may degrade.
Output Propagation Delay
The delay between a differential crossing of ENCODE and
ENCODE and the time when all output data bits are within
valid logic levels.
tA
N+3
N
A
IN
N+1
N+2
N+4
tENC
tENCH
N+1
tENCL
ENC, ENC
N
N+2
tE, DR
N+3
N+4
tOD
N–3
N–2
N–1
N
D[13:0]
DRY
Figure 1. Timing Diagram
–8–
REV. 0
ADI [ ADI ]
