LTC1403-1/LTC1403A-1

1

14031fc

BLOCK DIAGRAM

FEATURES

DESCRIPTION

Serial 12-Bit/14-Bit, 2.8Msps

Sampling ADCs with Shutdown

APPLICATIONS

n

2.8Msps Conversion Rate

n

Low Power Dissipation: 14mW

n

3V Single Supply Operation

n

2.5V Internal Bandgap Reference can be Overdriven

n

3-Wire Serial Interface

n

Sleep (10µW) Shutdown Mode

n

Nap (3mW) Shutdown Mode

n

80dB Common Mode Rejection

n

±1.25V Bipolar Input Range

n

Tiny 10-Lead MSE Package

n

Communications

n

Data Acquisition Systems

n

Uninterrupted Power Supplies

n

Multiphase Motor Control

n

Multiplexed Data Acquisition

serial ADCs with differential inputs. The devices draw only

4.7mA from a single 3V supply and come in a tiny 10-lead

MSE package. A Sleep shutdown feature lowers power

consumption to 10µW. The combination of speed, low

powerandtinypackagemakestheLTC1403-1/LTC1403A-1

suitable for high speed, portable applications.

The 80dB common mode rejection allows users to elimi-

nate ground loops and common mode noise by measuring

signals differentially from the source.

The devices convert –1.25V to 1.25V bipolar inputs

Theserialinterfacesendsouttheconversionresultsduring

the16clockcyclesfollowingCONV↑forcompatibilitywith

standard serial interfaces. If two additional clock cycles

for acquisition time are allowed after the data stream in

between conversions, the full sampling rate of 2.8Msps

can be achieved with a 50.4MHz clock.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

14031 TA01a

–

+

1

2

7

3

4

S & H

GND

EXPOSED PAD

LTC1403A-1

10µF

14-BIT ADC

3V

10µF

14

8

10

9

THREE-

STATE

SERIAL

OUTPUT

PORT

2.5V

REFERENCE

TIMING

LOGIC

SDO

CONV

SCK

5

6

11

THD, 2nd and 3rd vs Input

Frequency for Differential Input

Signals

FREQUENCY (MHz)

0.1

–80

–74

–68

–62

–56

1

10

100

14031 TA01b

–86

–92

–98

–104

–50

–44

THD

3rd

2nd