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PDF AD9022 Data sheet ( Hoja de datos )
| Número de pieza | AD9022 | |
| Descripción | 12-Bit 20 MSPS Monolithic A/D Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
12-Bit 20 MSPS
Monolithic A/D Converter
AD9022
FEATURES
Monolithic
12-Bit 20 MSPS A/D Converter
Low Power Dissipation: 1.4 Watts
On-Chip T/H and Reference
High Spurious-Free Dynamic Range
TTL Logic
FUNCTIONAL BLOCK DIAGRAM
ANALOG
INPUT
T/H
5-BIT
ADC
DAC
5-BIT
ADC
DIGITAL
ERROR
12
CORRECTION TTL
APPLICATIONS
Radar Receivers
ENCODE
T/H 16
DAC
Digital Communications
Digital Instrumentation
Electro-Optics
+2V
REF
8
4-BIT
ADC
+5V
–5.2V
GND
OPRODUCT DESCRIPTION
BThe AD9022 is a high speed, high performance, monolithic 12-
bit analog-to-digital converter. All necessary functions, includ-
Sing track-and-hold (T/H) and reference, are included on chip to
Oprovide a complete conversion solution. It is a companion unit
to the AD9023; the primary difference between the two is that
Lall logic for the AD9022 is TTL compatible, while the AD9023
utilizes ECL logic for digital inputs and outputs. Pinouts for the
Etwo parts are nearly identical.
TEOperating from +5 V and –5.2 V supplies, the AD9022 pro-
With DNL typically less than 0.5 LSB and 20 ns transient re-
sponse settling time, the AD9022 provides excellent results
when low-frequency analog inputs must be oversampled (such
as CCD digitization). The full scale analog input is ± 1 V with a
300 Ω input impedance. The analog input can be driven directly
from the signal source, or can be buffered by the AD96xx series
of low noise, low distortion buffer amplifiers.
All timing is internal to the AD9022; the clock signal initiates
the conversion cycle. For best results, the encode command
should contain as little jitter as possible. High speed layout prac-
vides excellent dynamic performance. Sampling at 20 Msps with tices must be followed to ensure optimum A/D performance.
AIN = 1 MHz, the spurious-free dynamic range (SFDR) is typi-
cally 76 dB; with AIN = 9.6 MHz, SFDR is 74 dB. SNR is typi-
cally 65 dB.
The AD9022 is built on a trench isolated bipolar process and
utilizes an innovative multipass architecture (see the block
diagram). The unit is packaged in 28-pin ceramic DIPs and
The on-board T/H has a 110 MHz bandwidth and, more impor- gullwing surface mount packages. The AD9022 is specified to
tantly, is designed to provide excellent dynamic performance for operate over the industrial (–25°C to +85°C) and military
analog input frequencies above Nyquist. This feature is neces-
(–55°C to +125°C) temperature ranges.
sary in many under-sampling signal processing applications,
such as in direct IF-to-digital conversion.
To maintain dynamic performance at higher IFs, monolithic
RF track-and-holds (such as the AD9100 and AD9101
Samplifier™) can be used with the AD9022 to process signals
up to and beyond 70 MHz.
Samplifier is a trademark of Analog Devices, Inc.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
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.
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
OThe encode rate at which the SNR of the lowest analog signal
frequency tested drops by no more than 3 dB below the guaran-
Bteed limit.
SMaximum Conversion Rate
The encode rate at which parametric testing is performed.
OOutput Propagation Delay
The delay between the 50% point of the rising edge of the EN-
LCODE command and the time when all output data bits are
Ewithin valid logic levels.
TOvervoltage Recovery Time
EThe 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–
5 Page 
AD9022
OBSOLETEFigure13. TopofBoard,ViewedFromTop
REV. A
Figure 14. Center of Board, Viewed From Top
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD9022.PDF ] | |
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