AD13465
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.
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.
Maximum Conversion Rate
The encode rate at which parametric testing is performed.
Aperture Delay
Output Propagation Delay
The delay between a differential crossing of ENCODE and
ENCODE command and the instant at which the analog input
is sampled.
The delay between a differential crossing of ENCODE and
ENCODE command and the time when all output data bits are
within valid logic levels.
Aperture Uncertainty (Jitter)
The sample-to-sample variation in aperture delay.
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.
Differential Analog Input Resistance, Differential Analog
Input Capacitance, and Differential Analog Input Impedance
The real and complex impedances measured at each analog
input port. The resistance is measured statically and the capaci-
tance and differential input impedances are measured with a
network analyzer.
Power Supply Rejection Ratio
The ratio of a change in input offset voltage to a change in
power supply voltage.
Signal-to-Noise-and-Distortion (SINAD)
Differential Analog Input Voltage Range
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., degrades as signal level is lowered) or in dBFS
(always related back to converter full scale).
The peak-to-peak differential voltage that must be applied to
the converter to generate a full-scale response. Peak differential
voltage is computed by observing the voltage from the other pin,
which is 180 degrees out of phase. Peak-to-peak differential is
computed by rotating the inputs phase 180 degrees and taking
the peak measurement again. The difference is then computed
between both peak measurements.
Signal-to-Noise Ratio (without Harmonics)
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 components,
excluding the first five harmonics and dc. May be reported in
dB (i.e., degrades as signal level is lowered) 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
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.
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.
Transient Response
Harmonic Distortion
The time required for the converter to achieve 0.02% accu-
racy when a one-half full-scale step function is applied to the
analog input.
The ratio of the rms signal amplitude to the rms value of the
worst harmonic component.
Integral Nonlinearity
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 dBc.
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.
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 ]
