AD7732 Analog Devices, AD7732 Datasheet - Page 2

• Manufacturer Part Number: AD7732
• Manufacturer: Analog Devices

Specifications of AD7732

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 3.05MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip 10V,Bip 5.0V,Uni 10V,Uni 5.0V
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

AD7732
TABLE OF CONTENTS
AD7732—Specifications.................................................................. 3
Timing Specifications....................................................................... 6
Absolute Maximum Ratings............................................................ 8
Typical Performance Characteristics ............................................. 9
Output Noise and Resolution Specification................................ 10
Pin Configurations and Functional Descriptions ...................... 12
Register Description....................................................................... 14
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
Chopping Enabled...................................................................... 10
Chopping Disabled..................................................................... 11
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
Rev. A | Page 2 of 32
Digital Interface Description ........................................................ 22
Circuit Description......................................................................... 26
Outline Dimensions ....................................................................... 32
Changes to Figure 22...................................................................... 25
Changes to Ordering Guide .......................................................... 32
2/03—Revision 0: Initial Version
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
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
Ordering Guide .......................................................................... 32