Document
Data Sheet
FEATURES
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
Dual Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP AD7903
GENERAL DESCRIPTION
The AD7903 is a dual 16-bit, successive approximation, analogto-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
Bits 18 16 100 kSPS 250 kSPS AD76911 AD76851 AD76871 AD7694 AD79421 400 kSPS to 500 kSPS AD76901 AD76861 AD76881 AD76931 AD79461 1000 kSPS AD79821 AD79801 AD7903 AD7902 ADC Driver ADA4941-1 ADA4841-x ADA4941-1 ADA4841-x
APPLICATIONS
Battery-powered equipment Communications Automated test equipment (ATE) Data acquisition Medical instrumentation Redundant measurement Simultaneous sampling
14
1
AD7680 AD7683 AD7684 AD7940
Pin-for-pin compatible.
FUNCTIONAL BLOCK DIAGRAM
REF = 2.5V TO 5V 2.5V
REF1 REF2
VDD1 VDD2 VIO1 SDI1 SCK1 CNV1 SDO1 VIO2 SDI2 SCK2 CNV2 SDO2 VIO1/VIO2 SDI1/SDI2 SCK1/SCK2 CNV1/CNV2 SDO1
ADA4941-1
REF IN1+
ADC1
±10V, ±5V, ... IN1–
ADA4941-1
REF IN2+
ADC2
±10V, ±5V, ... IN2– GND
3-WIRE OR 4-WIRE INTERFACE (SPI, CS, AND CHAIN MODES) SDO2
11755-001
AD7903
Figure 1.
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 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 owners.
Document Feedback
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
Free Datasheet http://www.datasheet4u.com/
IMPORTANT LINKS for the AD7903*
Last content update 01/14/2014 09:30 pm
SIMILAR PRODUCTS & PARAMETRIC SELECTION TABLES
Find Similar Products By Operating Parameters
DESIGN COLLABORATION COMMUNITY
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. Follow us on Twitter: www.twitter.com/ADI_News 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
DESIGN SUPPORT Submit your support request here:
Linear and Data Converters Embedded Processing and DSP Americas: Europe: China: India: Russia:
Telephone our Customer Interaction Centers toll free: SAMPLE & BUY
AD7903 View Price & Packaging Request Evaluation Board Request Samples Check Inventory & Purchase Find Local Distributors 1-800-262-5643 00800-266-822-82 4006-100-006 1800-419-0108 8-800-555-45-90
Quality and Reliability Lead(Pb)-Free Data
* 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.
Free Datasheet http://www.datasheet4u.com/
Powered by TCPDF (www.tcpdf.org)
AD7903 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ..................................................