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LTC2480

2480fc

TIMING DIAGRAMS

Timing Diagram Using Internal SCK

SDO

SCK

SDI

SLEEP

tKQMAX

CONVERSION

DATA IN/OUT

tKQMIN

2480 TD1

Timing Diagram Using External SCK

SDO

SCK

SDI

SLEEP

tKQMAX

CONVERSION

DATA IN/OUT

tKQMIN

2480 TD2

APPLICATIONS INFORMATION

CONVERTER OPERATION

Converter Operation Cycle

The LTC2480 is a low power, delta-sigma analog-to-digi-

tal converter with an easy to use 4-wire serial interface

and automatic differential input current cancellation.

Its operation is made up of three states. The converter

operating cycle begins with the conversion, followed by

the low power sleep state and ends with the data output

(see Figure 1). The 4-wire interface consists of serial data

output (SDO), serial clock (SCK), chip select (CS) and

serial data input (SDI).

Initially, the LTC2480 performs a conversion. Once the

conversion is complete, the device enters the sleep state.

CONVERT

SLEEP

DATA OUTPUT

CONFIGURATION INPUT

2480 F01

TRUE

FALSE

CS = LOW

AND

SCK

Figure 1. LTC2480 State Transition Diagram

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