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LTC1098LAC

Low Voltage, Micropower Sampling 8-Bit Serial I/O A/D Converters

Linear Technology 

LTC1096L/LTC1098L

TEST CIRCUITS

LTC1096L

CS

CLK

DOUT

LTC1098L

CS

Voltage Waveforms for ten

tWAKEUP

1

VOL

ten

B7

LTC1096/98 • TC06

DIN

START

CLK

DOUT

1

2

3

4

5

VOL

ten

B7

LTC1096/98 • TC07

APPLICATI S I FOR ATIO

INPUT DATA WORD

The LTC1096L requires no DIN word. It is permanently

configured to have a single differential input. The conver-

sion result, in which the output on the DOUT line is

presented in MSB-first sequence followed by LSB se-

quence, provides easy interface to MSB- or LSB-first

serial ports.

The LTC1098L latches data into the DIN input on the rising

edge of the clock. The input data words are defined as

follows:

START

SGL/

DIFF

ODD/

SIGN

MSBF

MUX MSB-FIRST/

ADDRESS LSB-FIRST

LTC1096/9 • AI01

Start Bit

The first “logical one” clocked into the DIN input after CS

goes low is the start bit. The start bit initiates the data

transfer. The LTC1098L will ignore all leading zeroes

which precede this logical one. After the start bit is

received, the remaining bits of the input word will be

clocked in. Further inputs on the DIN pin are then ignored

until the next CS cycle.

Multiplexer (MUX) Address

The bits of the input word following the START bit 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 the following tables. In

6

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