LTC1286 Linear Technology, LTC1286 Datasheet - Page 11

• Manufacturer Part Number: LTC1286
• Description: Micropower Sampling 12-Bit A/D Converters In S0-8 Packages
• Manufacturer: Linear Technology

APPLICATION INFORMATION
MSB-First Data (MSBF = 0)
MSB-First Data (MSBF = 1)
CLK
D
D
CLK
D
CS
IN
CS
OUT
IN
START
START
D
OUT
HI-Z
SGL/
SGL/
DIFF
DIFF
t
t
t
suCS
suCS
SMPL
ODD/
SIGN
ODD/
SIGN
*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW,
THE ADC WILL OUTPUT ZEROS INDEFINITELY.
t
t
DATA
BECOMES A HIGH IMPEDANCE NODE, LEAVING THE CLK RUNNING TO CLOCK OUT LSB-FIRST DATA OR ZEROES.
HI-Z
SMPL
MSBF
MSBF
: DURING THIS TIME, THE BIAS CIRCUIT AND THE COMPARATOR POWER DOWN AND THE REFERENCE INPUT
U
NULL
NULL
BIT
BIT
(MSB)
Figure 2. LTC1298 Operating Sequence Example: Differential Inputs (CH
(MSB)
B11
B11
U
B10
B10
ADDRESS IN
SHIFT MUX
B9
B9
CS
t
W
B8
CYC
B8
B7
B7
D
DON'T CARE
t
CONV
IN
t
CONV
1
B6
1 NULL BIT
B6
B5
B5
U
D
B4
B4
OUT
SHIFT A/D CONVERSION
RESULT OUT
t
1
B3
CYC
B3
B2
B2
B1
DON'T CARE
B1
B0 B1
B0*
D
IN
2
t
DATA
B2
POWER
DOWN
HI-Z
D
B3
OUT
2
B4
LTC1096/98 • AI01
B5
POWER DOWN
B6
t
DATA
LTC1286/LTC1298
+
B7
, CH
B8
–
)
B9
B10
B11
*
LTC1286/98 • F02
HI-Z
11