LTC1098AC datasheet(12/28 Pages) LINER

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LTC1096/LTC1096L

LTC1098/LTC1098L

Voltage Waveforms for ten

LTC1096/98 • TC07

tWAKEUP

LTC1096/LTC1096L

CLK

DOUT

ten

VOL

123

LTC1098/LTC1098L

DIN

CLK

DOUT

START

ten

LTC1096/98 • TC08

VOL

APPLICATI

I FOR ATIO

OVERVIEW

The LTC1096/LTC1096L/LTC1098/LTC1098L are 8-bit

micropower, switched-capacitor A/D converters. These

sampling ADCs typically draw 120

µA of supply current

when sampling up to 33kHz. Supply current drops linearly

as the sample rate is reduced (see Supply Current vs

Sample Rate on the first page of this data sheet). The ADCs

automatically power down when not performing conver-

sion, drawing only leakage current. They are packaged in

8-pin SO packages. The LTC1096L/LTC1098L operate on

a single supply ranging from 2.65V to 4V. The LTC1096

operates on a single supply ranging from 3V to 9V while

the LTC1098 operates from 3V to 6V supplies.

The LTC1096/LTC1096L/LTC1098/LTC1098L comprise

an 8-bit, switched-capacitor ADC, a sample-and-hold and

a serial port (see Block Diagram). Although they share the

same basic design, the LTC1096(L) and LTC1098(L) differ

in some respects. The LTC1096(L) has a differential input

and has an external reference input pin. It can measure

signals floating on a DC common mode voltage and can

operate with reduced spans down to 250mV. Reducing the

span allows it to achieve 1mV resolution. The LTC1098(L)

has a 2-channel input multiplexer and can convert either

channel with respect to ground or the difference between

the two.

SERIAL INTERFACE

The LTC1098(L) communicates with microprocessors

and other external circuitry via a synchronous, half duplex,

4-wire serial interface while the LTC1096(L) uses a 3-wire

interface (see Operating Sequence in Figures 1 and 2).

TEST CIRCUITS

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