AD9022AQ AD [Analog Devices], AD9022AQ Datasheet - Page 5

• Manufacturer Part Number: AD9022AQ
• Description: 12-Bit 20 MSPS Monolithic A/D Converter
• Manufacturer: AD [Analog Devices]

DEFINITIONS OF SPECIFICATIONS
Analog Bandwidth
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by FFT analysis) is
reduced by 3 dB.
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.
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
Harmonic Distortion
The rms value of the fundamental divided by the rms value of
the worst harmonic component.
Integral Nonlinearity
The deviation of the transfer function from a reference line
measured in fractions of 1 LSB using a “best straight line” de-
termined 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
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
input signal 1 dB below full scale.
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.
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.
REV. B
–5–
ANALOG
INPUT
11k
Figure 1. Equivalent Circuits
COMPENSATION
ENCODE
Compensation
Output Stage
Analog Input
Encode Input
+V
–V
–V
S
S
S
12k
+V
180
120
20pF
S
50
100
900
+V
–V
–V
DIGITAL
OUTPUT
+V
S
S
S
S
–V
S
AD9022
10pF