Datasheet

11
LTC1285/LTC1288
APPLICATION INFORMATION
WUU
U
CLK
CS
t
CYC
B5
B6
B7
B8B9
B10B11
HI-Z
D
OUT
t
CONV t
DATA
HI-Z
t
suCS
NULL
BIT
B4 B3 B2 B1
POWER
DOWN
B0*
t
SMPL
(MSB)
(MSB)
CLK
START
ODD/
SIGN
SGL/
DIFF
CS
t
CYC
B11
B5
B6
B7
B8B9
B10B11
HI-Z
D
OUT
D
IN
t
CONV
t
DATA
HI-Z
t
suCS
NULL
BIT
MSBF
LTC1285/88 • F02
B4
B3
B3 B4 B5 B6 B7
B2
B2
B1 B0 B1
B10
B9B8
t
SMPL
*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW, 
THE ADC WILL OUTPUT ZEROS INDEFINITELY.
DON’T CARE
START
ODD/
SIGN
D
IN
DON’T CARE
t
DATA
: DURING THIS TIME, THE BIAS CIRCUIT AND THE COMPARATOR POWER DOWN AND THE REFERENCE INPUT
 BECOMES A HIGH IMPEDANCE NODE, LEAVING THE CLK RUNNING TO CLOCK OUT LSB-FIRST DATA OR ZEROES.
SGL/
DIFF

MSBF
*
POWER DOWN
Figure 2. LTC1288 Operating Sequence Example: Differential Inputs (CH
+
, CH
–
)
MSB-First Data (MSBF = 1)
MSB-First Data (MSBF = 0)