LTC1096AI(RevB) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1096AI Datasheet PDF : 28 Pages
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LTC1096/LTC1096L
LTC1098/LTC1098L
APPLICATI S I FOR ATIO
the A/D conversion result is output on the DOUT line.
Bringing CS high resets the LTC1096(L) for the next data
exchange.
Input Data Word
The LTC1096(L) requires no DIN word. It is permanently
configured to have a single differential input. The conver-
sion result, in which output on the DOUT line is MSB-first
sequence, followed by LSB sequence providing easy inter-
face to MSB- or LSB-first serial ports.
The LTC1098(L) clocks data into the DIN input on the rising
edge of the clock. The input data words are defined as
follows:
START
SGL/
DIFF
ODD/
SIGN
MSBF
Start Bit
MUX MSB-FIRST/
ADDRESS LSB-FIRST
LTC1096/8 • AI02
The first “logical one” clocked into the DIN input after CS
goes low is the start bit. The start bit initiates the data
transfer. The LTC1098(L) will ignore all leading zeros
which precede this logical one. After the start bit is
received, the remaining bits of the input word will be
clocked in. Further inputs on the DIN pin are then ignored
until the next CS cycle.
Multiplexer (MUX) Address
The bits of the input word following the START bit assign
the MUX configuration for the requested conversion. For
a given channel selection, the converter will measure the
voltage between the two channels indicated by the “+” and
“–” signs in the selected row of the followintg tables. In
single-ended mode, all input channels are measured with
respect to GND.
LTC1098(L) Channel Selection
SINGLE-ENDED MUX MODE
DIFFERENTIAL MUX MODE
MUX ADDRESS
SGL/DIFF ODD/SIGN
1
0
1
1
0
0
0
1
CHANNEL #
0
1 GND
+
–
+–
+
–
–
+
LTC1096/8 • AI03
MSB-First/LSB-First (MSBF)
The output data of the LTC1098(L) is programmed for
MSB-first or LSB-first sequence using the MSBF bit.
When the MSBF bit is a logical one, data will appear on
the DOUT line in MSB-first format. Logical zeros will be
filled in indefinitely following the last data bit. When the
MSBF bit is a logical zero, LSB-first data will follow the
normal MSB-first data on the DOUT line. (see Operating
Sequence)
Unipolar Transfer Curve
The LTC1096(L)/LTC1098(L) are permanently config-
ured for unipolar only. The input span and code assign-
ment for this conversion type are shown in the follow-
ing figures for a 5V reference.
Unipolar Transfer Curve
11111111
11111110
•
•
•
00000001
VIN
00000000
Unipolar Output Code
LTC1096/8 • AI04
OUTPUT CODE
11111111
11111110
•
•
•
00000001
00000000
INPUT VOLTAGE
VREF – 1LSB
VREF – 2LSB
•
•
•
1LSB
0V
INPUT VOLTAGE
(VREF = 5.000V)
4.9805V
4.9609V
•
•
•
0.0195V
0V
LTC1096/8 • AI05
Operation with DIN and DOUT Tied Together
The LTC1098(L) can be operated with DIN and DOUT tied
together. This eliminates one of the lines required to
communicate to the microprocessor (MPU). Data is trans-
mitted in both directions on a single wire. The processor
pin connected to this data line should be configurable as
either an input or an output. The LTC1098(L) will take
control of the data line and drive it low on the 4th falling
15
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