CH1
DOUT1
(
)
ADS1274
CH2
CH3
DIN
CH4
SCLK
DRDY
(SPI)
FSYNC
(Frame-Sync)
1
2
24
25
23
48
49
47
72
73
71
96
97
95
CH1
DOUT1
(
)
ADS1278
CH2
CH3
CH5
CH4
CH8
DIN
CH7
169
191
192
193
194
195
168
167
CH2
DOUT1
(
)
ADS1274
CH4
DIN
SCLK
DRDY
(SPI)
FSYNC
(Frame- Sync)
1
2
24
25
23
48
49
47
50
CH2
DOUT1
(
)
ADS1278
CH4
CH5
CH8
DIN
143
144
145
145
146
121
120
CH7
119
SBAS367F
–
JUNE 2007
–
REVISED FEBRUARY 2011
TDM Mode, Fixed-Position Data
TDM Mode, Dynamic Position Data
In this TDM data output mode, the data position of
In this TDM data output mode, when a channel is
the channels remain fixed, regardless of whether the
powered down, the data from higher channels shift
channels are powered down. If a channel is powered
one position in the data stream to fill the vacated data
down, the data are forced to zero but occupy the
slot.
shows the data stream with channel 1
same position within the data stream.
and channel 3 powered down.
shows the data stream with channel 1 and channel 3
powered down.
Discrete Data Output Mode
In Discrete data output mode, the channel data are
shifted out in parallel using individual channel data
output pins DOUT[4:1]/[8:1]. After the 24th SCLK, the
channel data are forced to zero. The data are also
forced to zero for powered down channels.
shows the discrete data output format.
Figure 78. TDM Mode, Fixed-Position Data (Channels 1 and 3 Shown Powered Down)
Figure 79. TDM Mode, Dynamic Position Data (Channels 1 and 3 Shown Powered Down)
32
©
2007
–
2011, Texas Instruments Incorporated
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