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參數資料
| 型號： | AD9022AQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 12-Bit 20 MSPS Monolithic A/D Converter |
| 中文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CDIP28 |
| 封裝： | CERAMIC, DIP-28 |
| 文件頁數： | 5/12頁 |
| 文件大小： | 240K |
| 代理商： | AD9022AQ |
AD9022
REV. B
–5–
DE FINIT IONS OF SPE CIFICAT IONS
Analog Bandwidth
T he analog input frequency at which the spectral power of the
fundamental frequency (as determined by FFT analysis) is
reduced by 3 dB.
Aperture Delay
T he delay between the rising edge of the ENCODE command
and the instant at which the analog input is sampled.
Aperture Uncertainty (Jitter)
T he sample-to-sample variation in aperture delay.
Differential Nonlinearity
T he deviation of any code from an ideal 1 LSB step.
Harmonic Distortion
T he rms value of the fundamental divided by the rms value of
the worst harmonic component.
Integral Nonlinearity
T he 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
T he 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
T he encode rate at which parametric testing is performed.
Output Propagation Delay
T he 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 T ime
T he 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)
T he ratio of a change in input offset voltage to a change in
power supply voltage.
Signal-to-Noise Ratio (SNR)
T he 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)
T he 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.
T ransient Response
T he time required for the converter to achieve 12-bit accuracy
when a step function is applied to the analog input.
T wo-T one Intermodulation Distortion (IMD) Rejection
T he ratio of the power of either of two input signals to the
power of the strongest third-order IMD signal.
ANALOG
INPUT
–V
S
+V
S
+V
S
180
V
120
V
10pF
Encode Input
11k
V
12k
V
–V
S
DIGITAL
OUTPUT
+V
S
Analog Input
Output Stage
–V
S
100
V
900
V
+V
S
ENCODE
Compensation
20pF
50
V
COMPENSATION
–V
S
–V
S
Figure 1. Equivalent Circuits
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