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CS
t
quiet1
t
su2
t
quiet3
SDO
D17
MSB
1
16 17 18 19
SCLK
D1 D0
LSB
D17 Repeated
BUSY
D15D16
Conversion N
D14 D3 D2
Conversion N+1
t
su5
t
h5
t
cyc
t
d14
t
quiet2
t
w2
t
d13
t
d12
t
h2
No CS
Fall
Zone
CS Fall After This
Point Reads Data
From Conversion
N
CS Fall Before This
Point Reads Data
From Conversion
N−1
CONVST
If There is 19th SCLK
2 3
4
CS
CONVST
SDO
D17
1 16 17 18 19
SCLK
LSB
BUSY
D2D16 D15
Conversion N+1
D14 D3 D1 D0
t
h6
t
su7
t
cyc
t
su6
t
w3
t
d15
MSB of Conversion N
t
d13
D17 Repeated
If There is 19th SCLK
Conversion N
t
quiet2
t
quiet1
FS
2
3
4
ADS8380
SLAS387A – NOVEMBER 2004 – REVISED DECEMBER 2004
Figure 45. Read Frame Controlled via CS (FS = 1)
If another data frame is attempted (by pulling CS high and then low) during an active data frame, then the
ongoing frame is aborted and a new frame is started.
2. Serial interface using FS:
A data read operation in this mode is shown in Figure 46 and Figure 47 . The MSB of the output data is
available at the rising edge of FS. MSB – 1 is shifted out at the first rising edge after the first falling edge of
SCLK after the FS falling edge. Subsequent bits are shifted at the subsequent rising edges of SCLK.
Figure 46. Read Frame Controlled via FS (FS is Low When BUSY Falls)
If FS is high when BUSY falls, the SDO is updated again with the new MSB when BUSY falls. This is shown in
Figure 47 .
19
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