LTC2400CS8 datasheet(9/40 Pages) LINER

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LTC2400

FU CTIO AL BLOCK DIAGRA

TEST CIRCUITS

Figure 1. LTC2400 State Transition Diagram

APPLICATIONS INFORMATION

AUTOCALIBRATION

AND CONTROL

DAC

DECIMATING FIR

INTERNAL

OSCILLATOR

SERIAL

INTERFACE

ADC

∑

∫

GND

VCC

VIN

SDO

SCK

VREF

(INT/EXT)

2400 FD

3.4k

SDO

2400 TA03

HI-Z TO VOH

VOL TO VOH

VOH TO HI-Z

CLOAD = 20pF

3.4k

SDO

2400 TA04

HI-Z TO VOL

VOH TO VOL

VOL TO HI-Z

CLOAD = 20pF

VCC

Converter Operation Cycle

The LTC2400 is a low power, delta-sigma analog-to-

digital converter with an easy to use 3-wire serial interface.

Its operation is simple and made up of three states. The

converter operating cycle begins with the conversion,

followed by a low power sleep state and concluded with

the data output (see Figure 1). The 3-wire interface con-

sists of serial data output (SDO), a serial clock (SCK) and

a chip select (CS).

Initially, the LTC2400 performs a conversion. Once the

conversion is complete, the device enters the sleep state.

While in this sleep state, power consumption is reduced by

CONVERT

SLEEP

DATA OUTPUT

2400 F01

CS AND

SCK

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