LTC2452

1

2452fb

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Ultra-Tiny, Differential, 16-Bit

ΔΣ ADC with SPI Interface

analog-to-digital converter. The LTC2452 uses a single

2.7V to 5.5V supply and communicates through an SPI

interface. The ADC is available in an 8-pin, 3mm × 2mm

DFN package or TSOT-23 package. It includes an integrated

oscillator that does not require any external components.

It uses a delta-sigma modulator as a converter core and

has no latency for multiplexed applications. The LTC2452

includes a proprietary input sampling scheme that reduces

the average input sampling current several orders of

magnitude when compared to conventional delta-sigma

converters. Additionally, due to its architecture, there is

negligible current leakage between the input pins.

The LTC2452 can sample at 60 conversions per second,

and due to the very large oversampling ratio, has extremely

relaxed antialiasing requirements. The LTC2452 includes

continuous internal offset and full-scale calibration algo-

rithms which are transparent to the user, ensuring accuracy

over time and over the operating temperature range. The

converter has an external REF pin and the differential input

Following a single conversion, the LTC2452 can automati-

cally enter a sleep mode and reduce its supply current to

less than 0.2μA. If the user reads the ADC once a second,

the LTC2452 consumes an average of less than 50μW

from a 2.7V supply.

Codes

Applications

Required

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6208279, 6411242, 7088280, 7164378.

DIFFERENTIAL INPUT VOLTAGE (V)

–3

1

3

2452 TA01b

–1

0

2

–2

–3

–1

–2

12

0

3

10k

10k

10k

R

CS

3-WIRE SPI

INTERFACE

SCK

SDO

0.1μF

0.1μF

10μF

2.7V TO 5.5V

0.1μF

REF

GND

LTC2452

2452 TA01a