LTC1293BCSW datasheet(13/28 Pages) LINER

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LTC1293/LTC1294/LTC1296

129346fs

MSB-First/LSB-First (MSBF)

The output data of the LTC1293/4/6 is programmed for

MSB-first or LSB-first sequence using the MSB bit. When

the MSBF bit is a logical one, data will appear on the DOUT

line in MSB-first format. Logical zeroes will be filled in

indefinitely following the last data bit to accommodate

longer word lengths required by some microprocessors.

When the MSBF bit is a logical zero, LSB first data will

follow the normal MSB first data on the DOUT line. In the

bipolar mode the sign bit will fill in after the MSB bit for

MSBF = 0 (see Operating Sequence).

Power Shutdowns (PS)

The power shutdown feature of the LTC1293/4/6 is acti-

vated by making the PS bit a logical zero. If CS remains low

after the PS bit has been received, a 12-bit DOUT word with

Example 2: The same conditions as Example 1 except

COM = 1V. The resulting input span is 1V

≤ IN+ ≤ 4V. Note

if IN

+ ≥ 4V the resulting DOUT word is all 1’s. If IN+ ≤ 1V

then the resulting DOUT word is all 0’s.

Example 3: Let VCC = 5V, V

– = –5V, REF+ = 4V, REF– = 1V

and COM = 1V. Bipolar mode of operation. The resulting

input span is –2V

≤ IN+ ≤ 4V.

For differential input configurations with the same condi-

tions as in the above three examples the resulting input

spans are as follows:

Example 1 (Diff.): IN

– ≤ IN+ ≤ IN– + 3V.

Example 2 (Diff.): IN

– ≤ IN+ ≤ IN– + 3V.

Example 3 (Diff.): IN

– – 3V ≤ IN+ ≤ IN– + 3V.

APPLICATI

I FOR ATIO

Operating Sequence

Example: Differential Inputs (CH4

+, CH5–), Unipolar Mode

LTC1293 AI05

MSB-FIRST DATA (MSBF = 0)

MSB-FIRST DATA (MSBF = 1)

tCYC

DIN

DOUT

START

SEL1

UNI

SGL/

DIFF

ODD/

SIGN

MSBF

tCONV

tSMPL

SEL0

HI-Z

FILLED WITH ZEROES

DON'T CARE

CLK

DON'T

CARE

B11

CLK

DON'T

CARE

tCYC

DIN

START

SEL1

UNI

SGL/

DIFF

ODD/

SIGN

MSBF

SEL0

DON'T CARE

DOUT

tCONV

tSMPL

HI-Z

B11

B1 B0 B1

B11

FILLED WITH

ZEROES

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