LTC1291DC datasheet(8/20 Pages) LINER

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LTC1291

APPLICATI

I FOR ATIO

DATA (DIN/DOUT). Data transfer is initiated by a falling chip

select (CS) signal. After CS falls the LTC1291 looks for a

start bit. After the start bit is received a 4-bit input word is

shifted into the DIN input which configures the LTC1291

and starts the conversion. After one null bit, the result of

the conversion appears MSB-first on the DOUT line. The

conversion result is output, bit by bit, as the conversion is

performed. At the end of the data exchange CS should be

brought high. This resets the LTC1291 in preparation for

the next data exchange.

Operating Sequence

(Example: Differential Inputs (CH0+, CH1–))

MSB-FIRST DATA (MSBF = 1)

tCYC

START

MSBF

tSMPL

HI-Z

FILLED WITH ZEROES

DIN

SGL/

DIFF

ODD/

SIGN

DOUT

tCONV

HI-Z

B11

tCONV

B11

FILLED WITH

ZEROES

CLK

DON'T

CARE

LSB-FIRST DATA (MSBF = 0)

tCYC

DON’T

CARE

DON'T CARE

DIN

DOUT

CLK

START

MSBF

ODD/

SIGN

tSMPL

SGL/

DIFF

DON'T CARE

1291 AI03

B11

START

MSBF

HI-Z

FILLED WITH

ZEROES

DIN

SGL/

DIFF

ODD/

SIGN

DOUT

B11

CLK

DON'T CARE

1291 AI04

SHUTDOWN*

NEW CONVERSION BEGINS

START

MSBF

SGL/

DIFF

ODD/

SIGN

HI-Z

DATA NOT VALID

REQUEST POWER SHUTDOWN

* STOPPING THE CLOCK WILL HELP REDUCE POWER CONSUMPTION

CS CAN BE BROUGHT HIGH ONCE DIN HAS BEEN CLOCKED IN

Power Shutdown Operating Sequence

(Example: Differential Inputs (CH0+, CH1–) and MSB-First Data)

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