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LTC1285

3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages

Linear Technology 

LTC1285/LTC1288

APPLICATION INFORMATION

MSB-First Data (MSBF = 0)

CS

tsuCS

CLK

tCYC

POWER DOWN

START

ODD/

SIGN

DIN

DON’T CARE

SGL/ MSBF

DIFF

NULL

DOUT

HI-Z

BIT

B11 B10 B9

B8

B7

B6

B5

B4

B3 B2

B1 B0

B1

B2

B3

B4

B5

B6

B7

B8

B9 B10 B11*

HI-Z

tSMPL

(MSB)

tCONV

tDATA

MSB-First Data (MSBF = 1)

tCYC

CS

CLK

DIN

DOUT

tsuCS

ODD/

START SIGN

DON’T CARE

SGL/

DIFF

HI-Z

MSBF

NULL

BIT B11 B10 B9 B8 B7 B6 B5 B4 B3

tSMPL

(MSB)

tCONV

POWER

DOWN

B2 B1 B0*

HI-Z

tDATA

*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW,

THE ADC WILL OUTPUT ZEROS INDEFINITELY.

tDATA: DURING THIS TIME, THE BIAS CIRCUIT AND THE COMPARATOR POWER DOWN AND THE REFERENCE INPUT

BECOMES A HIGH IMPEDANCE NODE, LEAVING THE CLK RUNNING TO CLOCK OUT LSB-FIRST DATA OR ZEROES.

Figure 2. LTC1288 Operating Sequence Example: Differential Inputs (CH+, CH–)

LTC1285/88 • F02

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