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AD9032 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9032
Beschreibung 12-Bit 25 MSPS A/D Converter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
AD9032 Datasheet, Funktion
a
12-Bit 25 MSPS
A/D Converter
AD9032
FEATURES
FUNCTIONAL BLOCK DIAGRAM
25.6 MSPS Conversion Speeds
On-Board T/H, References, Timing
Low Power: 3.8 W
Single 40-Pin Package
74 dB Spurious-Free Dynamic Range
ANALOG
INPUT
TRACK-
AND-
HOLD
FLASH
ADC/DAC
5
ERROR
CORR.
LOGIC
12
DIGITAL
OUTPUT
to 12 MHz AIN
8
Bipolar Input: ؎1.024 V
APPLICATIONS
Radar
Signal Intelligence
Digital Spectrum Analyzers
Medical Imaging
OElectro-Optics
ENCODE
TIMING
CIRCUITS
SUM
AMP
RESIDUE
ENCODER
AD9032
DATA
READY
BSGENERAL DESCRIPTION
OThe AD9032 is the world’s fastest 12-bit analog-to-digital con-
verter (ADC) that includes on-board T/H, voltage references,
Land timing circuits. The AD9032 uses a subranging converter
Earchitecture to achieve sample rates from dc to 25.6 MSPS. Pack-
aged in a single 40-pin hybrid, the AD9032 is pin-compatible with
TEthe AD9034, which operates at word rates up to 20 MSPS.
EVALUATION BOARD
An evaluation board which is available for the AD9032 (part
number AD9034/PCB) provides an easy and flexible method
for evaluating the ADC’s performance without (or prior to)
developing a user-specified printed circuit board. The evalua-
tion board was originally designed and used for evaluating the
AD9034 A/D converter, but is equally useful for the pin-
This ECL-compatible ADC requires only +5 V and –5.2 V sup- compatible AD9032.
plies, an analog input, and a stable ECL clock to obtain the best The board includes a reconstruction DAC, analog input ampli-
dynamic performance available in a 12-bit ADC. This kind of
fier, and digital output interface. Physically, it is 7.25 inches ϫ
performance is achieved with advanced bipolar circuits, custom 6 inches in size and uses the layout and applications information
designed and manufactured by Analog Devices. The latest in
contained in the AD9034 data sheet.
monolithic track-and-hold technology ensures accurate sam-
pling of high frequency analog inputs.
Generous space is provided near the analog input and digital
outputs of the evaluation board to support additional signal pro-
Dynamic performance has been optimized to achieve SNR of
cessing components the user may wish to add. These two proto-
64 dB and a spurious-free dynamic range (SFDR) of 74 dB for typing areas include through holes with 100-mil centers to
analog bandwidths up to 12 MHz. All units are tested for dy-
support a variety of component additions.
namic performance at a sample rate of 25.6 MSPS.
For additional operating details, a schematic of the evaluation
The AD9032 is available in either a 40-pin ceramic DIP or
board, and complete layout information, consult the data sheet
leaded flatpack. The two versions operate over an industrial
on the AD9034 A/D converter.
(–25°C to +85°C) or military (–55°C to +125°C) temperature
range.
REV. 0
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






AD9032 Datasheet, Funktion
AD9032
USING THE AD9032
Power Supplies
Layout Information
The unique design of the AD9032 provides excellent dynamic
Preserving the accuracy and dynamic performance of the
performance without a need for high voltage power supplies.
AD9032 requires that designers pay special attention to the lay- Two supplies (+5 V and –5.2 V) are all that are required to
out of the printed circuit board. Signal paths should be imped- achieve rated performance. Careful layout and decoupling of
ance matched and properly terminated at or near the package
power supplies used in conjunction with a low impedance ana-
connections. Analog signal paths should be isolated from digital log ground plane will reduce supply-related noise components.
signal paths. Capacitive and inductive coupling of digital signals
into analog signal sections can degrade the overall performance
of the A/D converter.
Separate analog and digital supplies are not required. In applica-
tions with only limited analog supply current, a separate digital
supply source can be used for the –5.2 V supply on Pin 20. This
Analog Input
supply typically requires 310 mA (330 mA max) and may be
The analog input pin of the AD9032 is terminated with a 100 shared with other ECL logic devices when isolated with bypass
load. The analog input range of the AD9032 is factory trimmed capacitors and/or ferrite bead inductors (Fair-Rite Products
for a ± 1.024 V input for compatibility with the AD9034. The
signal presented to the monolithic T/H is divided in half to opti-
mize dynamic performance.
When the amplitude, bandwidth, or dc level of the analog input
requires external signal conditioning, the selection of the input
amplifier is of particular concern. The noise and distortion of
Othe amplifier must be taken into account to preserve the dy-
namic range of the AD9032. The AD9617 wideband, current
Bfeedback amplifier is an excellent choice for most applications.
STiming
OInternal timing for the AD9032 is trimmed at the factory to sim-
plify use. Care should be taken to ensure that the encode com-
Lmand to the AD9032 is free from jitter that can degrade
dynamic performance. Differential ECL inputs to the AD9032
Ecan be derived from a single-ended source using a fast compara-
Ttor such as the AD96685. The encode source should be located
Eand terminated as close to the AD9032 as possible.
Corporation part # 2743001111, Wallkill, NY). Each power
supply pin should be capacitively decoupled to the ground plane
through a good high frequency ceramic capacitor (0.1 µF) and a
single large value capacitor (tantalum 10 µF).
For optimum performance, “clean” linear supplies ensure that
switching noise on the supplies does not introduce distortion
products during the encoding process. Recognizing, however,
that switching power supplies may be required in power-
sensitive applications, decoupling recommendations outlined
above are critically important for using switching supplies
effectively. Elsewhere in this data sheet, a graph shows the
PSRR of the AD9032 as a function of the ripple frequency
present on the AD9032 supplies. Clearly, if they must be used,
switching power supplies with the lowest possible frequency
should be selected.
Thermal Management
The AD9032 design minimizes power dissipation; however, the
The ECL-compatible digital outputs are latched to provide valid
data for the entire conversion period (less the transition region
of latch). This data should be latched into external ECL regis-
ADC does typically require 3.8 W (4.5 W max) to operate. To
ensure long life and reliable operation, the maximum junction
temperature in the AD9032 must be limited to +175°C.
ters located near the AD9032. External termination resistors are Within the hybrid, the hottest discrete die has a case to junction
required (510 recommended). The data are latched with ei-
temperature rise of 10°C (max). Therefore, the case tempera-
ther the encode command or the data ready signal provided on ture of the AD9032 should not exceed +165°C under worst case
the AD9032. The rising edge of the data ready signal occurs
typically 7.5 ns after the data changes.
operating conditions. Without airflow, the θCA of the hybrid
package is 13°C/W. Assuming maximum power dissipation, this
Gain and Offset Adjustment
Gain and offset pins are normally not connected. Rated perfor-
mance is guaranteed without any external connection to these
causes a 57°C rise in case temperature over the ambient air tem-
perature. The maximum still air temperature, therefore, is equal
to +108°C.
pins. In most applications, wide variations in input signal range Rated performance of the AD9032 is guaranteed for case oper-
and offset can be accommodated using external amplifiers.
ating temperatures of +85°C (AD9032A/B) and +125°C
However, in those applications where a vernier adjustment is re- (AD9032T). This equates to a maximum operating ambient
quired (such as nulling out factory trim limits), the gain and off- temperature of +28°C and +68°C, respectively, in still air. In
set pins will provide sufficient adjustment range.
most applications, airflow is recommended. The following im-
Both inputs offer a 20 kinput resistance that can be driven
from a voltage source (DAC, amplifier) or the center tap of a
provements in the thermal characteristics of the system assume
that the AD9032 is soldered to a PC board.
potentiometer. The offset pin provides a 195 mV/V sensitivity to The θCA of the hybrid is reduced to 5°C/W with 500 LFPM air-
input offset, while the gain pin offers 120 mV/V adjustment of
flow. This will extend the rated performance to ambient operat-
the full-scale input range of the ADC. The adjustment range for ing ranges of +63°C for the AD9032A/B and +103°C for the
offset is limited to 10 mV and for gain is 20 mV without intro-
AD9032T. The addition of a heat sink (Thermalloy #6087B,
ducing potential dynamic errors or restricting the operating tem- Dallas, Texas; phone 214-243-0839) will further improve the
perature range of the part.
thermal transfer of the hybrid to 3°C/W (@ 500 LFPM). Using
a heat sink with airflow, the total case to ambient temperature
rise is only 13°C, which results in a maximum ambient environ-
ment of +72°C (AD9032A/B) and +112°C (AD9032T).
–6– REV. 0

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