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PDF ( 数据手册 , 数据表 ) AD9237

零件编号 AD9237
描述 Low Power A/D Converter
制造商 Analog Devices
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AD9237 数据手册, 描述, 功能
Data Sheet
12-Bit, 20 MSPS/40 MSPS/65 MSPS
3 V Low Power A/D Converter
AD9237
FEATURES
Ultralow power
85 mW at 20 MSPS
135 mW at 40 MSPS
190 mW at 65 MSPS
SNR = 66 dBc to Nyquist at 65 MSPS
SFDR = 80 dBc to Nyquist at 65 MSPS
DNL = ±0.7 LSB
Differential input with 500 MHz bandwidth
Flexible analog input: 1 V p-p to 4 V p-p range
Offset binary, twos complement, or gray code data formats
Output enable pin
2-step power-down
Full power-down and sleep mode
Clock duty cycle stabilizer
APPLICATIONS
Ultrasound and medical imaging
Battery-powered instruments
Hand-held scope meters
Low cost digital oscilloscopes
Low power digital still cameras and copiers
Low power communications
GENERAL DESCRIPTION
The AD9237 is a family of monolithic, single 3 V supply, 12-bit,
20 MSPS/40 MSPS/65 MSPS analog-to-digital converters
(ADC). This family features a high performance sample-and-
hold amplifier (SHA) and voltage reference. The AD9237 uses a
multistage differential pipelined architecture with output error
correction logic to provide 12-bit accuracy at 20 MSPS/
40 MSPS/65 MSPS data rates and guarantees no missing codes
over the full operating temperature range.
With significant power savings over previously available ADCs,
the AD9237 is suitable for applications in imaging and medical
ultrasound.
Fabricated on an advanced CMOS process, the AD9237 is
available in a 32-lead LFCSP and is specified over the industrial
temperature range (−40°C to +85°C).
FUNCTIONAL BLOCK DIAGRAM
AVDD
DRVDD
VIN+
VIN–
REFT
REFB
SHA
MODE2
VREF
SENSE
REF
SELECT
MDAC1
4
A/D
10-STAGE
1 1/2-BIT
PIPELINE
15
A/D
3
CORRECTION LOGIC
12
OUTPUT BUFFERS
AD9237
CLOCK
DUTY CYCLE
STABILIZER
0.5V
MODE
SELECT
OE
OTR
D11
D0
AGND
CLK
PDWN
Figure 1.
MODE
DGND
PRODUCT HIGHLIGHTS
1. Operating at 65 MSPS, the AD9237 consumes a low 190 mW
at 65 MSPS, 135 mW at 40 MSPS, and 85 mW at 20 MSPS.
2. Power scaling reduces the operating power further when
running at lower speeds.
3. The AD9237 operates from a single 3 V power supply and
features a separate digital output driver supply to
accommodate 2.5 V and 3.3 V logic families.
4. The patented SHA input maintains excellent performance
for input frequencies beyond Nyquist and can be configured
for single-ended or differential operation.
5. The AD9237 is optimized for selectable and flexible input
ranges from 1 V p-p to 4 V p-p.
6. An output enable pin allows for multiplexing of the outputs.
7. Two-step power-down supports a standby mode in addition
to a power-down mode.
8. The OTR output bit indicates when the signal is beyond the
selected input range.
9. The clock duty cycle stabilizer (DCS) maintains converter
performance over a wide range of clock pulse widths.
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2005–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com







AD9237 pdf, 数据表
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 5.
Pin Name
With
Respect to
ELECTRICAL
AVDD
AGND
DRVDD
DGND
AGND
DGND
AVDD
DRVDD
Digital
DGND
Outputs, OE
CLK, MODE,
MODE2
AGND
VIN+, VIN–
AGND
VREF
AGND
SENSE
AGND
REFB, REFT
AGND
PDWN
AGND
ENVIRONMENTAL1
Operating Temperature
Junction Temperature
Lead Temperature (10 sec)
Storage Temperature
Min Max
–0.3 +3.9
–0.3 +3.9
–0.3 +0.3
–3.9 +3.9
–0.3 DRVDD + 0.3
−0.3 AVDD + 0.3
–0.3 AVDD + 0.3
–0.3 AVDD + 0.3
–0.3 AVDD + 0.3
–0.3 AVDD + 0.3
–0.3 AVDD + 0.3
–40 +85
150
300
–65 +150
Unit
V
V
V
V
V
V
V
V
V
V
V
°C
°C
°C
°C
1 Typical thermal impedances (32-lead LFCSP), θJA = 32.5°C/W, θJC = 32.71°C/W.
These measurements were taken on a 4-layer board in still air, in accordance
with EIA/JESD51-1.
AD9237
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Absolute maximum ratings are limiting values to be applied
individually and beyond which the serviceability of the circuit
may be impaired. Functional operability is not necessarily
implied. Exposure to absolute maximum rating conditions for
an extended period may affect device reliability.
ESD CAUTION
Rev. C | Page 7 of 24







AD9237 equivalent, schematic
Data Sheet
67.5
67.0 AD9237-20
AD9237-40
66.5
66.0
AD9237-65
10.83
10.75
10.67
65.5 10.59
65.0
10
20 30 40 50 60
CLOCK FREQUENCY (MSPS)
10.50
70
Figure 32. AD9237 SINAD/ENOB vs. Clock Frequency with fIN = Nyquist
AD9237
90
85
SNR
80
75
70
SFDR
65
60
–40
–20
0
20 40 60 80 85
TEMPERATURE (°C)
Figure 33. AD9237-65 SNR/SFDR vs. Temperature with fIN = 32.5MHz
Rev. C | Page 15 of 24










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