AD7927 Analog Devices, AD7927 Datasheet - Page 2

• Manufacturer Part Number: AD7927
• Description: 8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7927

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 200kSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

AD7927
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 6
Pin Configuration and Function Descriptions ............................. 7
Terminology ...................................................................................... 8
Typical Performance Characteristics ........................................... 10
Control Register .............................................................................. 12
Sequencer Operation ...................................................................... 13
Shadow Register .............................................................................. 14
Typical Connection Diagram ........................................................ 17
REVISION HISTORY
12/11—Rev. B to Rev. C
Changes to Features Section............................................................ 1
Changes to Table 1 ............................................................................ 3
Changes to Table 3 ............................................................................ 6
Changes to Ordering Guide, Added Automotive Products
Section .............................................................................................. 27
12/08—Rev. A to Rev. B
Changes to ESD Parameter, Table 3 ............................................... 6
Changes to Ordering Guide .......................................................... 27
Timing Specifications .................................................................. 5
ESD Caution .................................................................................. 6
Circuit Information .................................................................... 15
Converter Operation .................................................................. 15
Analog Input ............................................................................... 15
ADC Transfer Function ............................................................. 16
Handling Bipolar Input Signals ................................................ 16
Analog Input Selection .............................................................. 17
Rev. C | Page 2 of 28
Modes of Operation ....................................................................... 19
Serial Interface ................................................................................ 22
Microprocessor Interfacing ........................................................... 24
Application Hints ........................................................................... 26
Outline Dimensions ....................................................................... 27
1/07—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Updated Layout ................................................................................. 8
Updated Layout .............................................................................. 10
Changes to Figure 12 Caption ...................................................... 14
Changes to Figure 13 Caption ...................................................... 15
Changes to Ordering Guide .......................................................... 27
1/03—Revision 0: Initial Version
Digital Inputs .............................................................................. 17
V
The Reference ............................................................................. 18
Normal Mode (PM1 = PM0 = 1) ............................................. 19
Full Shutdown (PM1 = 1, PM0 = 0) ........................................ 19
Auto Shutdown (PM1 = 0, PM0 = 1) ....................................... 20
Powering Up the AD7927 ......................................................... 21
Power vs. Throughput Rate ....................................................... 21
Writing Between Conversions .................................................. 22
AD7927 to TMS320C541 .......................................................... 24
AD7927 to ADSP-21xx .............................................................. 24
AD7927 to DSP563xx ................................................................ 25
Grounding and Layout .............................................................. 26
Evaluating the AD7927 Performance ...................................... 26
Ordering Guide .......................................................................... 27
Automotive Products ................................................................. 27
DRIVE
............................................................................................ 18
Data Sheet