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ADS8331IBRGET Datasheet(PDF) 30 Page - Texas Instruments

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Part # ADS8331IBRGET
Description  Low-Power, 16-Bit, 500kSPS, 4-/8-Channel Unipolar Input ANALOG-TO-DIGITAL CONVERTERS with Serial Interface
PDF  43 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS8331IBRGET Datasheet(HTML) 30 Page - Texas Instruments

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ADS8331/32
#1
SDI
SDO
SDI
SDO
SDI
SDO
MICROCONTROLLER
SDI
SDO
CS1
CS2
CS3
ProgramDevice#1:CFR_D5= ‘1’
INT
CS
CONVST
CS
CONVST
CS
CONVST
EOC/INT
CDI
CDI
ProgramDevices#2and#3:CFR_D5= ‘0’
SCLK
SCLK
SCLK
SCLK
ADS8331/32
#2
ADS8331/32
#3
CONVST
CONVST
CONVST
#1
#2
#3
EOC#1
(activelow)
CS #2
#3
CS
SCLK#1
SCLK#2
SCLK#3
SDO#1
CDI#2
SDO#2
CDI#3
Conversion N
Conversion
fromDevice#2
N
1..............16
ManualTrigger,ReadWhileSampling
(UseinternalCCLK,EOCactivelow,andTAGmodedisabled)
High-Z
High-Z
High-Z
CS #1
t
=18CCLK
CONV
t
=3CCLKmin
SAMPLE1
t
SU2
t
SU2
High-Z
SDO#3
High-Z
High-Z
1..............16
1..............16
Conversion
fromDevice#3
N
Conversion
fromDevice#1
N
Conversion
fromDevice#1
N
Conversion
fromDevice#2
N
Conversion
fromDevice#1
N
SDI#1
SDI#2
SDI#3
Don'tCare
Configure
ReadData
ReadData
Don'tCare
ADS8331
ADS8332
SBAS363 – DECEMBER 2009
www.ti.com
Figure 46. Multiple Converters Connected Using Daisy-Chain Mode
When multiple converters are used in daisy-chain mode, the first converter is configured in regular mode while
the rest of the converters downstream are configured in daisy-chain mode. When a converter is configured in
daisy-chain mode, the CDI input data go straight to the output register. Therefore, the serial input data passes
through the converter with either a 16 SCLK (if the TAG feature is disabled) or 24 SCLK delay, as long as CS is
active. See Figure 47 for detailed timing. In this timing diagram, the conversion in each converter is performed
simultaneously.
Figure 47. Simplified Dasiy-Chain Mode Timing with Shared CONVST and Continuous CS
30
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS8331 ADS8332



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