LTC1090 Linear Technology, LTC1090 Datasheet - Page 14

• Manufacturer Part Number: LTC1090
• Description: Single Chip 10-Bit Data Acquisition System
• Manufacturer: Linear Technology

SCLK
APPLICATIO S I FOR ATIO
4. CS Low During Conversion
In the normal mode of operation, CS is brought high
during the conversion time (see Figure 3). The serial port
ignores any SCLK activity while CS is high. The LTC1090
will also operate with CS low during the conversion. In this
mode, SCLK must remain low during the conversion as
shown in Figure 4. After the conversion is complete, the
LTC1090
D
SCLK
14
D
OUT
D
OUT
CS
D
CS
IN
IN
SGL/
DIFF
SGL/
DIFF
B9
B9
ODD/
SIGN
ADDRESS
ODD/
SIGN
B8
ADDRESS
B8
SHIFT
MUX
SHIFT
MUX
IN
IN
SEL
SEL
B7
B7
1
1
SEL
SEL
U
B6
0
B6
0
UNI MSBF WL1 WL0
UNI MSBF WL1 WL0
B5
B5
U
B4
B4
B3
SAMPLE
ANALOG
B3
t
INPUT
SAMPLE
ANALOG
SMPL
t
INPUT
SMPL
W
B2
B2
B1
B1
Figure 3. CS High During Conversion
Figure 4. CS Low During Conversion
B0
B0
U
SCLK MUST REMAIN LOW
40 TO 44 ACLK CYCLES
DON’T CARE
DON’T CARE
40 TO 44 ACLK CYCLES
D
the data transfer can begin as normal.
5. Microprocessor Interfaces
The LTC1090 can interface directly (without external hard-
ware) to most popular microprocessor (MPU) synchronous
OUT
line will become active with the first output bit. Then
B9
SGL/
DIFF
SGL/
DIFF
B9
ODD/
SIGN
ODD/
SIGN
B8
B8
SEL
SEL
B7
B7
1
1
AND NEW ADDRESS IN
SHIFT RESULT OUT
SEL
SEL
AND NEW ADDRESS IN
B6
0
B6
0
SHIFT RESULT OUT
UNI MSBF WL1 WL0
UNI MSBF WL1 WL0
B5
B5
B4
B4
B3
B3
B2
B2
B1
B1
B0
B0
LTC1090 • AI10
LTC1090 • AI09
1090fc