AD9022SQ データシートの表示（PDF） - Analog Devices
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AD9022SQ Datasheet PDF : 12 Pages
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AD9022
DEFINITIONS OF SPECIFICATIONS
Analog Bandwidth
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by FFT analysis) is re-
duced by 3 dB.
+VS
+VS
Aperture Delay
The delay between the rising edge of the ENCODE command
and the instant at which the analog input is sampled.
Aperture Uncertainty (Jitter)
The sample-to-sample variation in aperture delay.
ANALOG
INPUT
180
120
10pF
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
–VS
Harmonic Distortion
The rms value of the fundamental divided by the rms value of
the worst harmonic component.
OBSOLETE Integral Nonlinearity
The deviation of the transfer function from a reference line mea-
sured in fractions of 1 LSB using a “best straight line” deter-
mined by a least square curve fit.
Minimum Conversion Rate
The encode rate at which the SNR of the lowest analog signal
frequency tested drops by no more than 3 dB below the guaran-
teed limit.
Maximum Conversion Rate
The encode rate at which parametric testing is performed.
Output Propagation Delay
The delay between the 50% point of the rising edge of the EN-
CODE command and the time when all output data bits are
within valid logic levels.
Overvoltage Recovery Time
The amount of time required for the converter to recover to
Analog Input
+VS
100
ENCODE
900
–VS
Encode Input
COMPENSATION
–VS
50
12-bit accuracy after an analog input signal 150% of full scale is
reduced to the full-scale range of the converter.
Power Supply Rejection Ratio (PSRR)
The ratio of a change in input offset voltage to a change in
power supply voltage.
Signal-to-Noise Ratio (SNR)
The ratio of the rms signal amplitude to the rms value of
“noise,” which is defined as the sum of all other spectral compo-
nents, including harmonics but excluding dc, with an analog in-
put signal 1 dB below full scale.
20pF
–VS
Compensat ion
+VS
11k
12k
Signal-to-Noise Ratio (Without Harmonics)
The ratio of the rms signal amplitude to the rms value of
“noise,” which is defined as the sum of all other spectral compo-
nents, excluding the first five harmonics and dc, with an analog
input signal 1 dB below full scale.
DIGITAL
OUTPUT
Transient Response
The time required for the converter to achieve 12-bit accuracy
when a step function is applied to the analog input.
Two-Tone Intermodulation Distortion (IMD) Rejection
The ratio of the power of either of two input signals to the
power of the strongest third-order IMD signal.
–VS
Output Stage
Figure 1. Equivalent Circuits
REV. A
–5–
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