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ADS1258-EP Arkusz danych(PDF) 7 Page - Texas Instruments

Numer części ADS1258-EP
Szczegółowy opis  16-CHANNEL, 24-BIT ANALOG-TO-DIGITAL CONVERTER
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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ADS1258-EP Arkusz danych(HTML) 7 Page - Texas Instruments

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SCLK
CS
(1)
DIN
DOUT
t
SCLK
t
CSSC
t
SPW
t
DIST
t
DIHD
t
SPW
t
CSDO
Hi-Z
Hi-Z
t
CSPW
t
DOPD
t
DOHD
NOTE:(1)
canbetiedlow.
CS
DRDY
DOUT
t
DRDY
t
DDO
ADS1258-EP
www.ti.com
SBAS445D
– MARCH 2009 – REVISED MARCH 2011
PARAMETER MEASUREMENT INFORMATION
Figure 1. Serial Interface Timing
SERIAL INTERFACE TIMING CHARACTERISTICS
At TA= –40°C to +105°C
(1) and DVDD = 2.7 V to 5.25 V, unless otherwise noted.
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
tSCLK
SCLK Period
2
τCLK
(2)
tSPW
SCLK High or Low Pulse Width (exceeding max resets SPI interface)
0.8
4096(3)
τCLK
tCSSC
CS Low to First SCLK: Setup Time(4)
2.5
τCLK
tDIST
Valid DIN to SCLK Rising Edge: Setup Time
10
ns
tDIHD
Valid DIN to SCLK Rising Edge: Hold Time
5
ns
tDOPD
SCLK Falling Edge to Valid New DOUT: Propagation Delay(5)
20
ns
tDOHD
SCLK Falling Edge to Old DOUT Invalid: Hold Time
0
ns
tCSDO
CS High to DOUT Invalid (tri-state)
5
τCLK
tCSPW
CS Pulse Width High
2
τCLK
(1)
Ensured by characterization only.
(2)
τCLK = master clock period = 1/fCLK.
(3)
Programmable to 256
τCLK.
(4)
CS can be tied low.
(5)
DOUT load = 20 pF || 100k
Ω to DGND.
Figure 2. DRDY Update Timing
DRDY UPDATE TIMING CHARACTERISTICS
SYMBOL
DESCRIPTION
TYP
UNITS
t DRDY
DRDY High Pulse Width Without Data Read
1
τCLK
tDDO
Valid DOUT to DRDY Falling Edge (CS = 0)
0.5
τCLK
Copyright
© 2009–2011, Texas Instruments Incorporated
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