LTC2309

1

2309f

BLOCK DIAGRAM

FEATURES

APPLICATIONS

DESCRIPTION

8-Channel, 12-Bit SAR ADC

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

All other trademarks are the property of their respective owners.

Integral Nonlinearity

vs Output Code

Addresses Plus One Global for Synchronization

× 4mm QFN Package

The LTC

serial interface. This ADC includes an internal reference

and a fully differential sample-and-hold circuit to reduce

common mode noise. The LTC2309 operates from an

internal clock to achieve a fast 1.3μs conversion time.

The LTC2309 operates from a single 5V supply and

draws just 300μA at a throughput rate of 1ksps. The

ADC enters nap mode when not converting, reducing

the power dissipation.

The LTC2309 is available in a small 24-pin 4mm

× 4mm

QFN package. The internal 2.5V reference and 8-channel

multiplexer further reduce PCB board space require-

ments.

The low power consumption and small size make the

LTC2309 ideal for battery-operated and portable applica-

this ADC a good match for space-constrained systems.

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

2309 TA01

PORT

ANALOG

INPUT

MUX

ANALOG INPUTS

0V TO 4.096V UNIPOLAR

±2.048V BIPOLAR

REFCOMP

INTERNAL

2.5V REF

5V

GND

LTC2309

0.1μF

12-BIT

SAR ADC

+

–

2.2μF

10μF

0.1μF

10μF

0.1μF

10μF

SDA

SCL

AD1

AD0

OUTPUT CODE

0

0

0.25

0.50

4096

2309 G01

–0.25

–0.50

–1.00

1024

2048

3072

–0.75

1.00

0.75