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ADS7229IPW Datasheet(PDF) 35 Page - Texas Instruments

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Part # ADS7229IPW
Description  LOW-POWER, 12-BIT, 1MHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE
PDF  46 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS7229IPW Datasheet(HTML) 35 Page - Texas Instruments

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background image
EOC#1
(activelow)
CONVST #2=1
FS/
#1
CS
INT
(activelow)
Common S
K
CL
C s
a c d
a ed M n
a ual Tr
a
ig
h
ge
W
r/Read
ile S mpling
(UseinternalCCLK,EOC,and
programmedasactivelow)
heldlowduringtheNtimes16bitstransfercycle
INT
CS
SDO#2
SDI
t
CONV =18CCLKs
1……………………16
1101b
READResult
1……………………16
Nth
1……………………16
1101b
READResult
FS/
#2
CS
FS/
#3
CS
SDO#1
Nthfrom #1
SDO#3
N
1th#
-
2
Nthfrom #3
Nthfrom #1
Nthfrom #1
N
1th#
-
2
t
4
t
4
CONVST #1
CONVST #3
READResult
1101b
t
SAMPLE1 =3CCL
n
KsMi
ADS7229
ADS7230
www.ti.com........................................................................................................................................................................................................ SBAS437 – MAY 2008
Figure 64 shows a slightly different scenario where CONVST is not shared by the second converter. Converters
#1 and #3 have the same CONVST signal. In this case, converter #2 simply passes the previous conversion data
downstream.
Figure 64. Simplified Cascade Timing (Separate CONVST)
The number of SCLKs required for a serial read cycle depends on the combination of different read modes, TAG
bit, chain mode, and the way a channel is selected (that is, auto channel select). These possible configurations
are listed in Table 6.
Table 6. Required SCLKs For Different Read Out Mode Combinations
CHAIN MODE
AUTO CHANNEL
NUMBER OF SCLK PER SPI
ENABLED CFR.D5
SELECT CFR.D11
TAG ENABLED CFR.D1
READ
TRAILING BITS
0
0
0
12
None
0
0
1
≥ 17
MSB is TAG bit plus zero(s)
0
1
0
12
None
0
1
1
≥ 17
TAG bit plus seven zeros
1
0
0
16
None
1
0
1
24
TAG bit plus seven zeros
1
1
0
16
None
1
1
1
24
TAG bit plus seven zeros
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): ADS7229 ADS7230



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