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AD9248BCPZRL7-40 Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer AD9248BCPZRL7-40
Bauteilbeschribung  14-Bit, 20/40/65 MSPS Dual A/ D Converter
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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14-Bit, 20/40/65 MSPS
Dual A/D Converter
Preliminary Technical Data
AD9248
Rev. PrE
6/29/2004
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 that may
result from its use. Specifications subject to change without notice. No license
is granted by implication or otherwise under any patent or patent rights of
Analog Devices. Trademarks and registered trademarks are the property of
their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,
U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703© 2004 Analog Devices, Inc. All rights reserved.
FEATURES
Integrated Dual 14-Bit A-to-D Converters
Single 3 V Supply Operation (2.7 V to 3.6 V)
SNR = 73 dBc (to Nyquist, AD9248-65)
SFDR = 83 dBc (to Nyquist, AD9248-65)
Low Power: 600 mW at 65 MSPS
Differential Input with 500 MHz 3 dB Bandwidth
Exceptional Cross Talk Immunity > 85dB
Flexible Analog Input: 1 V p-p to 2 V p-p Range
Offset Binary or Twos Complement Data Format
Clock Duty Cycle Stabilizer
APPLICATIONS
Ultrasound Equipment
IF Sampling in Communications Receivers:
IS-95, CDMA One, IMT-2000
Battery-Powered Instruments
Hand-Held Scopemeters
Low Cost Digital Oscilloscopes
GENERAL DESCRIPTION
The AD9248 is a dual, 3 V, 14-bit, 20/40/65 MSPS analog-to-
digital converter. It features dual high performance sample-and
hold amplifiers and an integrated voltage reference. The
AD9248 uses a multistage differential pipelined architecture
with output error correction logic to provide 14-bit accuracy
and guarantee no missing codes over the full operating
temperature range at up to 65 MSPS data rates. 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
multiplexed systems that switch full-scale voltage levels in
successive channels and for sampling inputs at frequencies well
beyond the Nyquist rate.
Dual single-ended clock inputs are used to control all internal
conversion cycles. A duty cycle stabilizer is available on the
AD9248-65 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 determine low or high overflow.
Fabricated on an advanced CMOS process, the AD9248 is
available in a space saving 64-lead LQFP and is specified over
the industrial temperature range (–40? C to +85? C).
ADC
D13
A-D0A
AGND
VIN- _A
CLK_A
AD9248
SHA
14
VIN+_A
DCS
SENSE
REFT_A
14
AVDD
ADC
VIN-_B
SHA
VIN+_B
14
D13
B-D0B
14
MUX_SELECT
CLK_B
AGND
DRGND
SHARED_REF
PWDN_A
DFS
Mode
Control
+
-
REFB_A
REFT_B
REFB_B
Clock
Duty Cycle
Stabilizer
PWDN_B
OTR_B
OEB_B
OEB_A
OTR_A
0.5V
VREF
DRVDD
Figure 1. Functional Block Diagram
PRODUCT HIGHLIGHTS
1.
Pin compatible with AD9238, 12-bit 20/40/65MSPS
ADC.
2.
Speed grade options of 20 MSPS, 40 MSPS, and 65
MSPS allow flexibility between power, cost, and
performance to suit an application.
3.
Low power consumption:
AD9248-65: 65 MSPS = 600 mW.
AD9248-40: 40 MSPS = 330 mW.
AD9248-20: 20 MSPS = 180 mW.
4.
The patented SHA input maintains excellent
performance for input frequencies up to 100 MHz and
can be configured for single-ended or differential
operation.
5.
Typical channel isolation of 85 dB @ fIN = 10 MHz.
6.
The clock duty cycle stabilizer (AD9248-65 only)
maintains performance over a wide range of clock
duty cycles.
7.
The OTR output bits indicate when either input signal
is beyond the selected input range.
8.
Multiplexed data output option enables single-port
operation from either data port A or data port B.


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