Datasheet

SYNC
CLK
SYNC
DIN DOUT1
SCLK SCLK
ADS1274/78
SYNC
DIN
CLK CLK
DOUT1
DRDY
DOUTfromDevices1and2
DRDY OutputfromDevice1
SCLK
ADS1274/78
U2
U1
CH1,U1DOUT1 CH2,U1 CH3,U1 CH4,U1 CH5,U1 CH1,U2 CH2,U2 DIN2
SCLK
DRDY
(SPI)
FSYNC
(Frame-Sync)
1 2
25 4926 50 73 74 97 98
193 194 217 218 385 386
SYNC
FSYNC
DOUT1
SYNC
SCLK
FSYNC
SCLK
ADS1274/78
SYNC
DIN
CLK
CLK
FSYNC
DOUT1
SCLK
ADS1274/78
SYNC
FSYNC
DOUT1
SCLK
ADS1274/78
SYNC
DIN
FSYNC
DOUT1
SerialData
Devices1and2
SerialData
Devices3and4
SCLK
ADS1274/78
CLK CLK CLK
DIN DIN
U4 U3 U2 U1
ADS1274
ADS1278
SBAS367F –JUNE 2007–REVISED FEBRUARY 2011 www.ti.com
NOTE: The number of chained devices is limited by the SCLK rate and device mode.
Figure 81. Daisy-Chaining of Two Devices, SPI Protocol (FORMAT[2:0] = 000 or 001)
Figure 82. Daisy-Chain Data Format of Figure 81 (ADS1278 shown)
NOTE: The number of chained devices is limited by the SCLK rate and device mode.
Figure 83. Segmented DOUT Daisy-Chain, Frame-Sync Protocol (FORMAT[2:0] = 011 or 100)
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