12-Bit, 20/40/65 MSPS
Dual A/D Converter
AD9238
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Integrated Dual 12-Bit Analog-to-Digital Converters
Single 3V Supply Operation (2.7V to 3.6V)
SNR = 70 dBc (to Nyquist, AD9238-65)
SFDR = 85 dBc (to Nyquist, AD9238-65)
Low Power: 600 mW at 65 MSPS
Differential Input with 500 MHz 3 dB Bandwidth
On-Chip Reference and SHA
Flexible Analog Input: 1V p-p to 2V p-p Range
Offset Binary orTwos Complement Data Format
Clock Duty Cycle Stabilizer
AVDD
DRVDD
OEB_A
OTR_A
VIN+_A
VIN–_A
A/D
SHA
D11_A
D0_A
REFT_A
REFB_A
MUX_SELECT
CLK_A
CLOCK
DUTY CYCLE
STABILIZER
VREF
CLK_B
DCS
SENSE
DFS
0.5V
PDWN_A
PDWN_B
SHARED_REF
MODE
SELECT
APPLICATIONS
Ultrasound Equipment
IF Sampling in Communications Receivers:
IS-95, CDMA One, IMT-2000
Battery-Powered Instruments
Hand-Held Scopemeters
AGND
REFB_B
REFT_B
OEB_B
OTR_B
D11_B
D0_B
VIN–_B
VIN+_B
A/D
SHA
Low Cost Digital Oscilloscopes
AGND
DRGND
PRODUCT HIGHLIGHTS
GENERAL DESCRIPTION
1. Integrated, dual version of the AD9235—a 12-bit,
20 MSPS/40 MSPS/65 MSPS ADC.
The AD9238 is a dual, 3V, 12-bit, 20 MSPS/40 MSPS/65 MSPS
analog-to-digital converter. It features dual high performance
sample-and-hold amplifiers and an integrated voltage reference.
The AD9238 uses a multistage differential pipelined architecture
with output error correction logic to provide 12-bit accuracy and
guarantee no missing codes over the full operating temperature
range at data rates up to 65 MSPS.
2. Speed grade options of 20 MSPS, 40 MSPS, and 65 MSPS
allow flexibility between power, cost, and performance to suit
an application.
3. The AD9238 operates from a single 3V power supply and
features a separate digital output driver supply to accommo-
date 2.5V and 3.3V logic families.
The wide bandwidth, differential SHA allows for a variety of
user selectable input ranges and offsets including single-ended
applications. It is suitable for various applications including multi-
plexed systems that switch full-scale voltage levels in successive
channels and for sampling inputs at frequencies well beyond the
Nyquist rate.The AD9238 is suitable for applications in commu-
nications, imaging, and medical ultrasound.
4. Low power consumption:
AD9238-20 operating at 20 MSPS consumes a low 180 mW.
AD9238-40 operating at 40 MSPS consumes a low 330 mW.
AD9238-65 operating at 65 MSPS consumes a low 600 mW.
5. The patented SHA input maintains excellent performance for
input frequencies up to 100 MHz and can be configured for
single-ended or differential operation.
Dual single-ended clock inputs are used to control all internal con-
version cycles. A duty cycle stabilizer is available on the AD9238-65
and can compensate for wide variations in the clock duty cycle,
allowing the converters to maintain excellent performance.The
digital output data is presented in either straight binary or twos
complement format. Out-of-range signals indicate an overflow
condition, which can be used with the most significant bit to deter-
mine low or high overflow.
6. Typical channel isolation of 80 dB @ fIN = 10 MHz.
7. The clock duty cycle stabilizer (AD9238-65 only) maintains
performance over a wide range of clock duty cycles.
8. The OTR output bits indicate when either input signal is
beyond the selected input range.
9. Multiplexed data output option enables single-port operation
from either data port A or data port B.
Fabricated on an advanced CMOS process, the AD9238 is avail-
able in a space saving 64-lead LQFP and is specified over the
industrial temperature range (–40°C to +85°C).
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed byAnalog Devices for its
use, nor for any infringements of patents or other rights of third parties
that may result from its use. No license is granted by implication or oth-
erwise under any patent or patent rights of Analog Devices.Trademarks
and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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