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ADS1246 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza ADS1246
Descripción Electrónicos  24-Bit Analog-to-Digital Converters for Temperature Sensors
Download  65 Pages
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Fabricante Electrónico  TI [Texas Instruments]
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ADS1246 Datasheet(HTML) 10 Page - Texas Instruments

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SCLK
DOUT[7]
DOUT[6]
DOUT[5]
DOUT[4]
DOUT[1]
DOUT[0]
DIN[0]
DIN[7]
DIN[6]
DIN[5]
DIN[4]
DIN[1]
DIN[0]
CS
DOUT/DRDY
(1)
DIN
t
CSSC
t
DIST
t
DIHD
t
SCLK
t
SCCS
t
CSDO
t
DOPD
t
SPWL
t
SPWH
t
DOHD
SCLK
(3)
1
2
3
8
7
6
5
4
DRDY
t
STD
t
DTS
t
PWH
ADS1246
ADS1247
ADS1248
SBAS426D – AUGUST 2008 – REVISED MARCH 2010
www.ti.com
TIMING DIAGRAMS
Figure 1. Serial Interface Timing
Table 1. Timing Characteristics for Figure 1 (1)
SYMBOL
DESCRIPTION
MIN
MAX
UNIT
tCSSC
CS low to first SCLK high (set up time)
10
ns
tSCCS
SCLK low to CS high (hold time)
7
tOSC
(2)
tDIST
DIN set up time
5
ns
tDIHD
DIN hold time
5
ns
tDOPD
SCLK rising edge to new data valid
30
ns
tDOHD
DOUT hold time
0
ns
500
ns
tSCLK
SCLK period
64
Conversions
tSPWH
SCLK pulse width high
0.25
0.75
tSCLK
tSPWL
SCLK pulse width low
0.25
0.75
tSCLK
tCSDO
CS high to DOUT high impedance
10
ns
(1)
DRDY MODE bit = 0.
(2)
tOSC = 1/fCLK. The default clock frequency fCLK = 4.096MHz.
Figure 2. SPI Interface Timing to Allow Conversion Result Loading(3) (4)
Table 2. Timing Characteristics for Figure 2
SYMBOL
DESCRIPTION
MIN
MAX
UNIT
tPWH
DRDY pulse width high
3
tOSC
tSTD
SCLK low prior to DRDY low
5
tOSC
tDTS
DRDY falling edge to SCLK rising edge
30
ns
(3)
This timing diagram is applicable only when the CS pin is low. SCLK need not be low during tSTD when CS is high.
(4)
SCLK should only be sent in multiples of eight during partial retrieval of output data.
10
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Product Folder Link(s): ADS1246 ADS1247 ADS1248


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