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ADS1174 Datasheet(PDF) 7 Page - Texas Instruments

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Part # ADS1174
Description  Quad/Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converters
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1174 Datasheet(HTML) 7 Page - Texas Instruments

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CLK
t
CPW
t
CLK
t
CPW
t
SD
t
SCLK
t
DIST
t
DOHD
t
SPW
Bit15(MSB)
Bit14
Bit13
t
SPW
t
DOPD
t
CD
t
DS
t
MSBPD
t
DIHD
· · ·
t
CONV
DRDY
SCLK
DOUT
DIN
TIMING REQUIREMENTS: SPI FORMAT
ADS1174
ADS1178
www.ti.com ........................................................................................................................................ SBAS373B – OCTOBER 2007 – REVISED SEPTEMBER 2008
TIMING CHARACTERISTICS: SPI FORMAT
For TA = –40°C to +105°C, IOVDD = 1.65V to 3.6V, and DVDD = 1.65V to 1.95V.
SYMBOL
PARAMETER
MIN
TYP
MAX
UNIT
tCLK
CLK period (1/fCLK)
(1)
37
10,000
ns
tCPW
CLK positive or negative pulse width
15
ns
tCONV
Conversion period (1/fDATA)
(2)
256
2560
tCLK
tCD
(3)
Falling edge of CLK to falling edge of DRDY
22
ns
tDS
(3)
Falling edge of DRDY to rising edge of first SCLK to retrieve data
1
tCLK
tMSBPD
DRDY falling edge to DOUT MSB valid (propagation delay)
16
ns
tSD
(3)
Falling edge of SCLK to rising edge of DRDY
18
ns
tSCLK
(4)
SCLK period
1
tCLK
tSPW
SCLK positive or negative pulse width
0.4
tCLK
tDOHD
(3) (5)
SCLK falling edge to new DOUT invalid (hold time)
10
ns
tDOPD
(3)
SCLK falling edge to new DOUT valid (propagation delay)
32
ns
tDIST
New DIN valid to falling edge of SCLK (setup time)
6
ns
tDIHD
(5)
Old DIN valid to falling edge of SCLK (hold time)
6
ns
(1)
fCLK = 27MHz maximum.
(2)
Depends on MODE[1:0] and CLKDIV selection. See Table 4 (fCLK/fDATA).
(3)
Load on DRDY and DOUT = 20pF.
(4)
For best performance, limit fSCLK/fCLK to ratios of 1, 1/2, 1/4, 1/8, etc.
(5)
tDOHD (DOUT hold time) and tDIHD (DIN hold time) are specified under opposite worst-case conditions (digital supply voltage and
ambient temperature). Under equal conditions, with DOUT connected directly to DIN, the timing margin is >4ns.
Copyright © 2007–2008, Texas Instruments Incorporated
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