ADS1274
ADS1278
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SBAS367–JUNE 2007
tCSHD
CLK
tSCSU
tSYN
SYNC
DRDY
tNDR
Figure 73. Synchronization Timing (SPI Protocol)
Table 9. SPI Protocol
SYMBOL
tCSHD
tSCSU
tSYN
DESCRIPTION
MIN
10
5
TYP
MAX
UNITS
CLK to SYNC hold time
SYNC to CLK setup time
Synchronize pulse width
Time for new data to be ready
ns
ns
1
CLK periods
Conversions (1/fDATA)
tNDR
129
tCSHD
CLK
tSCSU
tSYN
SYNC
FSYNC
DOUT
tNDR
Valid Data
Figure 74. Synchronization Timing (Frame-Sync Protocol)
Table 10. Frame-Sync Protocol
SYMBOL
tCSHD
tSCSU
tSYN
DESCRIPTION
MIN
10
5
TYP
MAX
UNITS
CLK to SYNC hold time
SYNC to CLK setup time
Synchronize pulse width
Time for new data to be ready
ns
ns
1
CLK periods
Conversions (1/fDATA)
tNDR
127
128
28
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