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| LTC1090_15 Datasheet, PDF (14/28 Pages) Linear Technology – Single Chip 10-Bit Data Acquisition System | |||
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LTC1090
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
DOUT line will become active with the first output bit. Then
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
SHIFT
MUX
ADDRESS
IN
CS
tSMPL
SAMPLE
ANALOG
INPUT
40 TO 44 ACLK CYCLES
SHIFT RESULT OUT
AND NEW ADDRESS IN
SCLK
DIN
SGL/
DIFF
ODD/
SIGN
SEL
1
SEL
0
UNI MSBF WL1
WL0
DOUT
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
DONâT CARE
SGL/
DIFF
ODD/
SIGN
SEL
1
SEL
0
UNI MSBF WL1 WL0
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Figure 3. CS High During Conversion
LTC1090 ⢠AI09
SHIFT
MUX
ADDRESS
IN
CS
tSMPL
SAMPLE
ANALOG
INPUT
40 TO 44 ACLK CYCLES
SHIFT RESULT OUT
AND NEW ADDRESS IN
SCLK
SCLK MUST REMAIN LOW
DIN
SGL/
DIFF
ODD/
SIGN
SEL
1
SEL
0
UNI MSBF WL1
WL0
DONâT CARE
SGL/
DIFF
ODD/
SIGN
SEL
1
SEL
0
UNI MSBF WL1 WL0
DOUT
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
B9
B8 B7 B6 B5 B4 B3 B2 B1 B0
Figure 4. CS Low During Conversion
LTC1090 ⢠AI10
1090fc
14
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