
11
LTC1286/LTC1298
APPLICATION INFORMATION
WU
U
Figure 2. LTC1298 Operating Sequence Example: Differential Inputs (CH+, CH–)
CLK
CS
tCYC
B5
B6
B7
B8
B9
B10
B11
HI-Z
DOUT
tCONV
tDATA
HI-Z
tsuCS
NULL
BIT
B4
B3
B2
B1
POWER
DOWN
B0*
tSMPL
(MSB)
CLK
START
ODD/
SIGN
SGL/
DIFF
CS
tCYC
B11
B5
B6
B7
B8
B9
B10
B11
HI-Z
DOUT
DIN
tCONV
tDATA
HI-Z
tsuCS
NULL
BIT
MSBF
LTC1286/98 F02
B4
B3
B4
B5
B6
B7
B2
B1
B0 B1
B10
B9
B8
tSMPL
*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
DIN
DON'T CARE
tDATA: 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
MSB-First Data (MSBF = 0)
MSB-First Data (MSBF = 1)
DIN 1
DIN 2
DOUT 1
DOUT 2
CS
SHIFT MUX
ADDRESS IN
1 NULL BIT
SHIFT A/D CONVERSION
RESULT OUT
LTC1096/98 AI01