LTC1098ACN8 datasheet(18/32 Pages) LINER

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LTC1096/LTC1096L

LTC1098/LTC1098L

10968fc

APPLICATIONS INFORMATION

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.

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)

MUX ADDRESS

SGL/DIFF

ODD/SIGN

CHANNEL #

–

GND

–

SINGLE-ENDED MUX MODE

DIFFERENTIAL MUX MODE

10968 AI03

OUTPUT CODE

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 0

•

0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0

INPUT VOLTAGE

VREF – 1LSB

VREF – 2LSB

•

1LSB

INPUT VOLTAGE

(VREF = 5.000V)

4.9805V

4.9609V

•

0.0195V

10968 AI05

VIN

0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 0

•

10968 AI04

Unipolar Transfer Curve

The LTC1096(L)/LTC1098(L) are permanently conﬁgured

for unipolar only. The input span and code assignment for

this conversion type are shown in the following ﬁgures

for a 5V reference.

Unipolar Transfer Curve

LTC1098(L) Channel Selection

Unipolar Output Code

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 com-

municate to the microprocessor (MPU). Data is transmit-

ted 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

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