LTC1090CSW datasheet(10/28 Pages) LINER

10 / 28 page

LTC1090

1090fc

Data transfer is initiated by a falling chip select (CS) signal.

After the falling CS is recognized, an 8-bit input word

is shifted into the DIN input which configures the LTC1090

for the next conversion. Simultaneously, the result of the

previous conversion is output on the DOUT line. At the end

of the data exchange the requested conversion begins and

CS should be brought high. After tCONV, the conversion is

complete and the results will be available on the next data

transfer cycle. As shown below, the result of a conversion

is delayed by one CS cycle from the input word requesting

it.

2. Input Data Word

The LTC1090 8-bit input data word is clocked into the DIN

input on the first eight rising SCLK edges after chip select

is recognized. Further inputs on the DIN pin are then

ignored until the next CS cycle. The eight bits of the input

word are defined as follows:

Multiplexer (MLIX) Address

The first four bits of the input word 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 Table 1. Note that in differential

mode (SGL/DIFF = O) measurements are limited to four

adjacent input pairs with either polarity. In single ended

mode, all input channels are measured with respect to

COM. Figure 1 shows some examples of multiplexer

assignments.

Table 1. Multiplexer Channel Selection

MUX ADDRESS

DIFFERENTIAL CHANNEL SELECTION

SGL/

ODD

SELECT

DIFF

SIGN

234567

–

MUX ADDRESS

SINGLE ENDED CHANNEL SELECTION

SGL/ ODD/

SELECT

DIFF SIGN

7 COM

100

–

100

–

101

–

101

–

110

–

110

–

111

–

111

–

APPLICATIO S I FOR ATIO

LTC1090 • AI02

Data

Transfer

tCONV

A/D

Conversion

DOUT

DIN

DIN Word 1

DOUT Word 0

tCONV

A/D

Conversion

Data

Transfer

DIN Word 2

DOUT Word 1

DIN Word 3

DOUT Word 2

LTC1090• AI03

Data Input (DIN) Word:

ODD/

SIGN

SELECT

UNI

MSBF

WL1

Word Length

MUX Address

Unipolar/

Bipolar

MSB First/

LSB First

WL0

SGL/

DIFF

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