LTC1093ACN datasheet(12/32 Pages) LINER

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LTC1091/LTC1092

LTC1093/LTC1094

APPLICATI

I FOR ATIO

DIN 1

DIN 2

DOUT 1

DOUT 2

SHIFT MUX

ADDRESS IN

1 NULL BIT

SHIFT A/D CONVERSION

RESULT OUT

1091/2/3/4 AI01

the first CLK pulse enables DOUT. After one null bit, the A/D

conversion result is output on the DOUT line. Bringing CS

high resets the LTC1092 for the next data exchange.

2. Input Data Word

The LTC1092 requires no DIN word. It is permanently

configured to have a single differential input and to operate

in unipolar mode. The conversion result is output on the

DOUT line in MSB-first sequence, followed by LSB-first

sequence, providing easy interface to MSB- or LSB-first

serial ports. The following disussion applies to the con-

figuration of the LTC1091/LTC1093/LTC1094.

The LTC1091/LTC1093/LTC1094 clock data into the DIN

input on the rising edge of the clock. The input data words

are defined as follows:

SELECT

START

SELECT

UNI

MSBF

MUX ADDRESS

LTC1093/LTC1094 DATA INPUT (DIN)WORD:

MSB-FIRST/

LSB-FIRST

UNIPOLAR/

BIPOLAR

1091/2/3/4 AI02

ODD/

SIGN

SGL/

DIFF

START

MSBF

MUX ADDRESS

LTC1091 DATA INPUT (DIN) WORD:

MSB-FIRST/

LSB-FIRST

ODD/

SIGN

SGL/

DIFF

tCONV

tCYC

tSMPL

Hi-Z

FILLED WITH ZEROS

1091/2/3/4 AI03

CLK

START

Hi-Z

ODD/SIGN

MSBF

SGL/

DIFF

DIN

DOUT

DON’T CARE

tCONV

tCYC

tSMPL

Hi-Z

FILLED WITH

ZEROS

1091/2/3/4 AI04

CLK

START

Hi-Z

ODD/SIGN

MSBF

SGL/

DIFF

DIN

DOUT

DON’T CARE

LTC1091 Operating Sequence

Example: Differential Inputs (CH1+, CH0 –)

MSB-First Data (MSBF = 1)

LSB-First Data (MSBF = 0)

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