LTC1286CS8 datasheet(9/24 Pages) LINER

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LTC1286/LTC1298

123

LTC1298

DIN

CLK

DOUT

START

ten

B11

VOL

LTC1286/98 • TC07

TEST CIRCUITS

Voltage Waveforms for tdis

Voltage Waveforms for ten

DOUT

WAVEFORM 1

(SEE NOTE 1)

VIH

tdis

90%

10%

DOUT

WAVEFORM 2

(SEE NOTE 2)

NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH

THAT THE OUTPUT IS HIGH UNLESS DISABLED BY THE OUTPUT CONTROL.

NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH

THAT THE OUTPUT IS LOW UNLESS DISABLED BY THE OUTPUT CONTROL.

LTC1286/98 • TC05

LTC1286/98 • TC06

LTC1286

CLK

DOUT

ten

B11

VOL

APPLICATION INFORMATION

while the LTC1298 operates from a 4.5V to 5.5V supply.

Both the LTC1286 and the LTC1298 contain a 12-bit,

switched-capacitor ADC, a sample-and-hold, and a

serial port (see Block Diagram). Although they share

the same basic design, the LTC1286 and LTC1298

differ in some respects. The LTC1286 has a differential

input and has an external reference input pin. It can

measure signals floating on a DC common-mode volt-

age and can operate with reduced spans to 1V. Reduc-

ing the spans allows it to achieve 244

µV resolution. The

LTC1298 has a two-channel input multiplexer and can

convert either channel with respect to ground or the

difference between the two. The reference input is tied

to the supply pin.

OVERVIEW

The LTC1286 and LTC1298 are micropower, 12-bit, suc-

cessive approximation sampling A/D converters. The

LTC1286 typically draws 250

µA of supply current when

sampling at 12.5kHz while the LTC1298 nominally con-

sumes 350

µA of supply current when sampling at

11.1 kHz. The extra 100

µA of supply current on the

LTC1298 comes from the reference input which is inten-

tionally tied to the supply. Supply current drops linearly as

the sample rate is reduced (see Supply Current vs Sample

Rate). The ADCs automatically power down when not

performing conversions, drawing only leakage current.

They are packaged in 8-pin SO and DIP packages. The

LTC1286 operates on a single supply from 4.5V to 9V,

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