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AD7732BRUZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33
2-Channel, ±10 V Input Range, High
Throughput, 24-Bit ∑-Δ ADC
AD7732
FEATURES
High resolution ADC
24 bits no missing codes
±0.0015% nonlinearity
Optimized for fast channel switching
18-bit p-p resolution (21 bits effective) at 500 Hz
16-bit p-p resolution (19 bits effective) at 2 kHz
14-bit p-p resolution (18 bits effective) at 15 kHz
On-chip per channel system calibration
2 fully differential analog inputs
Input ranges +5 V, ±5 V, +10 V, ±10 V
Overvoltage tolerant
Up to ±16.5 V not affecting adjacent channel
Up to ±50 V absolute maximum
3-wire serial interface
SPI™, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on logic inputs
Single-supply operation
5 V analog supply
3 V or 5 V digital supply
Package: 28-lead TSSOP
APPLICATIONS
PLCs/DCS
Multiplexing applications
Process control
Industrial instrumentation
GENERAL DESCRIPTION
The AD7732 is a high precision, high throughput analog front
end. True 16-bit p-p resolution is achievable with a total
conversion time of 500 μs (2 kHz channel switching), making it
ideally suitable for high resolution multiplexing applications.
The part can be configured via a simple digital interface, which
allows users to balance the noise performance against data
throughput up to a 15.4 kHz.
The analog front end features two fully differential input
channels with unipolar or true bipolar input ranges to ±10 V
while operating from a single +5 V analog supply. The part has
an overrange and underrange detection capability and accepts
an analog input overvoltage to ±16.5 V without degrading the
performance of the adjacent channels.
FUNCTIONAL BLOCK DIAGRAM
P0
SYNC/P1
AIN0(+)
AIN1(+)
AIN0(–)
AIN1(–)
SCLK
DIN
DOUT
CS
RESET
RDY
DGNDMCLKINMCLKOUTAGND AV
DD
DV
DD
BUFFER
REFERENCE
DETECT
REFIN(–) REFIN(+)
AD7732
24-BIT
Σ−Δ ADC
SERIAL
INTERFACE
CONTROL
LOGIC
CLOCK
GENERATOR
CALIBRATION
CIRCUITRY
I/O PORT
MUX
Figure 1.
The differential reference input features “No-Reference” detect
capability. The ADC also supports per channel system
calibration options. The digital serial interface can be
configured for 3-wire operation and is compatible with
microcontrollers and digital signal processors. All interface
inputs are Schmitt triggered.
The part is specified for operation over the extended industrial
temperature range of –40°C to +105°C.
Other parts in the AD7732 family are the AD7734 and
the AD7738.
The AD7734 is similar to AD7732, but its analog front end
features four single-ended input channels.
The AD7738 analog front end is configurable for four fully
differential or eight single-ended input channels, features
0.625 V to 2.5 V bipolar/unipolar input ranges, and accepts a
common-mode input voltage from 200 mV to AVDD – 300 mV.
The AD7738 multiplexer output is pinned out externally,
allowing the user to implement programmable gain or signal
conditioning before being applied to the ADC.
Rev. A
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2003–2011 Analog Devices, Inc. All rights reserved.
AD7732* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
EVALUATION KITS
• AD7732 Evaluation Board
DOCUMENTATION
Application Notes
• AN-202: An IC Amplifier User’s Guide to Decoupling,
Grounding, and Making Things Go Right for a Change
• AN-283: Sigma-Delta ADCs and DACs
• AN-311: How to Reliably Protect CMOS Circuits Against
Power Supply Overvoltaging
• AN-388: Using Sigma-Delta Converters-Part 1
• AN-389: Using Sigma-Delta Converters-Part 2
• AN-397: Electrically Induced Damage to Standard Linear
Integrated Circuits:
• AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-
Delta ADC
• AN-615: Peak-to-Peak Resolution Versus Effective
Resolution
• AN-626: Using the AD7732/AD7734/AD7738/AD7739
Checksum Register
• AN-663: AD7732/AD7734/AD7738/AD7739 Calibration
Registers
• AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power
Applications
Data Sheet
• AD7732: 2-Channel, ±10 V Input Range, High Throughput,
24-Bit Sigma-Delta ADC Data Sheet
SOFTWARE AND SYSTEMS REQUIREMENTS
• AD7734 - Microcontroller No-OS Driver
• AD7732/4/8/9 Evaluation Software
TOOLS AND SIMULATIONS
• Sigma-Delta ADC Tutorial
REFERENCE MATERIALS
Technical Articles
• Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
• MS-2210: Designing Power Supplies for High Speed ADC
• Part 1: Circuit Suggestions Using Features and
Functionality of New Sigma-Delta ADCs
• Part 2: Circuit Suggestions Using Features and
Functionality of New Sigma-Delta ADCs
DESIGN RESOURCES
• AD7732 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD7732 EngineerZone Discussions.
SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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AD7732
Rev. A | Page 2 of 32
TABLE OF CONTENTS
AD7732—Specifications.................................................................. 3
Timing Specifications....................................................................... 6
Absolute Maximum Ratings............................................................ 8
Typical Performance Characteristics ............................................. 9
Output Noise and Resolution Specification................................ 10
Chopping Enabled...................................................................... 10
Chopping Disabled..................................................................... 11
Pin Configurations and Functional Descriptions ...................... 12
Register Description....................................................................... 14
Register Access............................................................................ 15
Communications Register......................................................... 15
I/O Port Register......................................................................... 16
Revision Register ........................................................................ 16
Test Register ................................................................................ 16
ADC Status Register................................................................... 17
Checksum Register..................................................................... 17
ADC Zero-Scale Calibration Register ..................................... 17
ADC Full-Scale Register............................................................ 17
Channel Data Registers.............................................................. 17
Channel Zero-Scale Calibration Registers.............................. 18
Channel Full-Scale Calibration Registers................................ 18
Channel Status Registers ........................................................... 18
Channel Setup Registers ............................................................ 19
Channel Conversion Time Registers ....................................... 19
Mode Register ............................................................................. 20
Digital Interface Description ........................................................ 22
Hardware ..................................................................................... 22
Reset ............................................................................................. 23
Access the AD7732 Registers.................................................... 23
Single Conversion and Reading Data...................................... 23
Dump Mode................................................................................ 24
Continuous Conversion Mode ................................................. 24
Continuous Read (Continuous Conversion) Mode .............. 25
Circuit Description......................................................................... 26
Analog Front End....................................................................... 26
Analog Input’s Extended Voltage Range ................................. 27
Chopping..................................................................................... 27
Multiplexer, Conversion, and Data Output Timing ............. 28
Sigma-Delta ADC ...................................................................... 28
Frequency Response .................................................................. 28
Voltage Reference Inputs........................................................... 29
Reference Detect......................................................................... 29
I/O Port........................................................................................ 30
Calibration................................................................................... 30
ADC Zero-Scale Self-Calibration ............................................ 30
Per Channel System Calibration .............................................. 30
High Common-Mode Voltage Application ............................ 31
Outline Dimensions ....................................................................... 32
Ordering Guide .......................................................................... 32
REVISION HISTORY
6/11—Rev. 0 to Rev. A
Changes to ADC Performance Chopping Enabled, Offset Error
(Unipolar, Bipolar) Parameter, Offset Drift vs. Temperature
Parameter, Positive Full-Scale Drift vs. Temp. Parameter, and
Channel-to-Channel Isolation Parameter in Table 1................... 3
Change to ADC Performance Chopping Disabled, Channel-to-
Channel Isolation Parameter in Table 1 ........................................ 3
Changes to Figure 22...................................................................... 25
Changes to Ordering Guide.......................................................... 32
2/03—Revision 0: Initial Version
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33

AD7732BRUZ

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Manufacturer:
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Description:
Analog to Digital Converters - ADC 2Ch+/-10V InputRange 24-Bit
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