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AD9022 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9022
Beschreibung 12-Bit 20 MSPS Monolithic A/D Converter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
AD9022 Datasheet, Funktion
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 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






AD9022 Datasheet, Funktion
AD9022–Typical Characteristics
–76
–75
+25°C
–74 ROOM
–73
–55°C
–72
–71
–70
+125°C
–69
–68
0
12 3 4567 8
ANALOG INPUT FREQUENCY – MHz
9 10
70
65 +25°C
60 –55°C
55
50 +125°C
45
40
35
1.24 2.3
5.3 7.3 9.6 11.3 13.3 15.3 17.3 19.3
ANALOG INPUT FREQUENCY – MHz
Figure 2. Harmonic Distortion vs. Analog Input
Frequency
85
O AIN = 1.2MHz
80
B75
SO70
L65
ETE60
WORST HARMONICS
SNR
Figure 5. Signal-to-Noise Ratio vs. Analog Input
Frequency
90
80
AIN = 1.2MHz
ENCODE = 20MHz
70
60
50
40
30
20
10
SFDR
SNR
55
5
7.5 10 12.5 15 17.5 20 22.5 25
ENCODE RATE – MSPS
0
–50 –45 –40 –35 –30 –25 –20 –15 –10 –5 –1
INPUT LEVEL – dB
Figure 3. SNR and Harmonics vs. Encode Rate
Figure 6. SFDR and SNR vs. Analog Input Level
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
AIN = 1.2MHz
FS = 20MSPS
1024
2048
OUTPUT CODE
3072
4096
Figure 4. Differential Nonlinearity vs. Output Code
80
70 AIN = 9.6MHz
ENCODE = 20MHz
60
SFDR
50
SNR
40
30
20
10
0
–50 –45 –40 –35 –30 –25 –20 –15 –10 –5 –1
INPUT LEVEL – dB
Figure 7. SFDR and SNR vs. Analog Input Level
–6– REV. A

6 Page









AD9022 pdf, datenblatt
AD9022
OB Figure 15. Bottom of Board, Viewed from Bottom
S OUTLINE DIMENSIONS
ODimensions shown in inches and (mm).
LQ-28 (Ceramic DIP)
E28 15
TE0.610 (15.49)
0.500 (12.70)
1
14
0.225
(5.72)
MAX
0.026 (0.660)
0.014 (0.356)
1.490 (37.85) MAX
0.110 (2.79)
0.090 (2.29)
0.015
(0.38)
MIN
0.07 (1.78)
0.03 (0.76)
0.150
(3.81)
MIN
0.620 (15.75)
0.590 (14.99)
0.018 (0.457)
0.008 (0.203)
0.115
(2.921)
MAX
Z-28 (Ceramic Leaded Chip Carrier)
0.012 (0.305)
0.009 (0.229)
0.73 (18.544)
0.71 (18.036)
28 15
0.025
(0.635)
MIN
0.765 (19.431)
0.745 (18.923)
1
TOP VIEW
0.165
(4.191)
MAX
0.060 (1.524)
0.040 (1.016)
0.050
(1.27)
TYP
0.015
(0.381)
MIN
–12–
0.51 (12.954)
0.49 (12.446)
14
REV. A

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