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AD7903 Datasheet Download - Analog Devices

Номер произв AD7903
Описание PulSAR ADC
Производители Analog Devices
логотип Analog Devices логотип 

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AD7903 Даташит, Описание, Даташиты
Data Sheet
Dual Differential 16-Bit, 1 MSPS
PulSAR ADC 12.0 mW in QSOP
AD7903
FEATURES
GENERAL DESCRIPTION
16-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation
7.0 mW at 1 MSPS (VDD1 and VDD2 only)
12.0 mW at 1 MSPS (total)
140 µW at 10 kSPS
INL: ±0.5 LSB typical, ±2.0 LSB maximum
SINAD: 93.5 dB at 1 kHz
THD: −112 dB at 1 kHz
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.4 V to 5.1 V
Allows use of any input range
Easy to drive with the ADA4941-1
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Serial port interface (SPI)/QSPI/MICROWIRE/DSP compatible
20-lead QSOP package
Wide operating temperature range: −40°C to +125°C
APPLICATIONS
Battery-powered equipment
Communications
Automated test equipment (ATE)
Data acquisition
Medical instrumentation
Redundant measurement
Simultaneous sampling
The AD7903 is a dual 16-bit, successive approximation, analog-
to-digital converter (ADC) that operates from a single power
supply, VDDx, per ADC. It contains two low power, high speed,
16-bit sampling ADCs and a versatile serial port interface (SPI).
On the CNVx rising edge, the AD7903 samples the voltage
difference between the INx+ and INx− pins. The voltages on
these pins usually swing in opposite phases between 0 V and
VREF. The externally applied reference voltage of the REFx pins
(VREF) can be set independently from the supply voltage pins,
VDDx. The power of the device scales linearly with throughput.
Using the SDIx inputs, the SPI-compatible serial interface can
also daisy-chain multiple ADCs on a single 3-wire bus and provide
an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V,
or 5 V logic, using the separate VIOx supplies.
The AD7903 is available in a 20-lead QSOP package with operation
specified from −40°C to +125°C.
Table 1. MSOP 14-/16-/18-Bit PulSAR® ADCs
100
Bits kSPS
250
kSPS
400 kSPS
1000
to 500 kSPS kSPS
18
AD76911 AD76901
AD79821
16 AD7680 AD76851 AD76861
AD7683 AD76871 AD76881
AD7684 AD7694 AD76931
14 AD7940 AD79421 AD79461
AD79801
AD7903
AD7902
ADC
Driver
ADA4941-1
ADA4841-x
ADA4941-1
ADA4841-x
1 Pin-for-pin compatible.
FUNCTIONAL BLOCK DIAGRAM
REF = 2.5V TO 5V
2.5V
ADA4941-1
REF
±10V, ±5V, ...
REF
ADA4941-1
±10V, ±5V, ...
REF1 REF2 VDD1 VDD2
IN1+
ADC1
IN1–
VIO1
SDI1
SCK1
CNV1
SDO1
IN2+
ADC2
IN2–
VIO2
SDI2
SCK2
CNV2
SDO2
GND AD7903
VIO1/VIO2
SDI1/SDI2
SCK1/SCK2
CNV1/CNV2
SDO1
3-WIRE OR 4-WIRE
INTERFACE
(SPI, CS, AND
CHAIN MODES)
SDO2
Figure 1.
Rev. 0
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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AD7903 Даташит, Описание, Даташиты
IMPORTANT LINKS for the AD7903*
Last content update 01/14/2014 09:30 pm
SIMILAR PRODUCTS & PARAMETRIC SELECTION TABLES DESIGN COLLABORATION COMMUNITY
Find Similar Products By Operating Parameters
DOCUMENTATION
UG-609: Evaluating the AD7903 Dual Differential, 16-Bit, 1 MSPS
PulSAR ADC
Collaborate Online with the ADI support team and other designers
about select ADI products.
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Like us on Facebook: www.facebook.com/AnalogDevicesInc
EVALUATION KITS & SYMBOLS & FOOTPRINTS
View the Evaluation Boards and Kits page for documentation and
purchasing
Symbols and Footprints
SAMPLE & BUY
AD7903
View Price & Packaging
Request Evaluation Board
Request Samples
Check Inventory & Purchase
Find Local Distributors
DESIGN SUPPORT
Submit your support request here:
Linear and Data Converters
Embedded Processing and DSP
Telephone our Customer Interaction Centers toll free:
Americas:
1-800-262-5643
Europe:
00800-266-822-82
China:
4006-100-006
India:
1800-419-0108
Russia:
8-800-555-45-90
Quality and Reliability
Lead(Pb)-Free Data
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* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet.
Note: Dynamic changes to the content on this page (labeled 'Important Links') does not
constitute a change to the revision number of the product data sheet.
This content may be frequently modified.
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AD7903 Даташит, Описание, Даташиты
AD7903
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Modified Functional Block Diagram ............................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 14
Circuit Information.................................................................... 14
Converter Operation.................................................................. 14
Typical Connection Diagram ................................................... 15
REVISION HISTORY
12/13—Revision 0: Initial Version
Data Sheet
Analog Inputs ............................................................................. 15
Driver Amplifier Choice ........................................................... 16
Single-to-Differential Driver .................................................... 16
Voltage Reference Input ............................................................ 17
Power Supply............................................................................... 17
Digital Interface.......................................................................... 17
CS Mode ...................................................................................... 18
Chain Mode ................................................................................ 22
Applications Information .............................................................. 24
Simultaneous Sampling ............................................................. 24
Functional Saftey Considerations ............................................ 25
Layout............................................................................................... 26
Evaluating Performance of the AD7903.................................. 26
Outline Dimensions ....................................................................... 27
Ordering Guide .......................................................................... 27
Rev. 0 | Page 2 of 28
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