LTC2356-12/LTC2356-14

1

2356fb

BLOCK DIAGRAM

FEATURES

APPLICATIONS

DESCRIPTION

Serial 12-Bit/14-Bit, 3.5Msps

Sampling ADCs with Shutdown

serial ADCs with differential inputs. The devices draw

only 5.5mA from a single 3.3V supply and come in a

tiny 10-lead MSOP package. A Sleep shutdown feature

further reduces power consumption to 13µW. The com-

bination of speed, low power and tiny package makes the

LTC2356-12/LTC2356-14suitableforhighspeed,portable

applications.

The80dBcommonmoderejectionallowsuserstoeliminate

ground loops and common mode noise by measuring

signals differentially from the source.

The devices convert –1.25V to 1.25V bipolar inputs

Theserialinterfacesendsouttheconversionresultsduring

the 16 clock cycles following a CONV rising edge for com-

patibility with 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

3.5Msps can be achieved with a 63MHz 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.

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3.5Msps Conversion Rate

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74.1dB SINAD at 14-Bits, 71.1dB SINAD at 12-Bits

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Low Power Dissipation: 18mW

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3.3V Single Supply Operation

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2.5V Internal Bandgap Reference can be Overdriven

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3-Wire SPI-Compatible Serial Interface

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Sleep (13µW) Shutdown Mode

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Nap (4mW) Shutdown Mode

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80dB Common Mode Rejection

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±1.25V Bipolar Input Range

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Tiny 10-Lead MSOP Package

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Communications

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Data Acquisition Systems

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Uninterrupted Power Supplies

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Multiphase Motor Control

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Multiplexed Data Acquisition

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RFID

THD, 2nd and 3rd vs Input Frequency

for Differential Input Signals

2356 BD

–

+

1

2

7

3

4

S & H

GND

EXPOSED PAD

LTC2356-14

10µF

14-BIT ADC

3.3V

10µF

14

8

10

9

THREE-

STATE

SERIAL

OUTPUT

PORT

2.5V

REFERENCE

TIMING

LOGIC

SDO

CONV

SCK

5

6

11

FREQUENCY (MHz)

0.1

–80

–74

–68

–62

–56

1

10

100

2356 G02

–86

–92

–98

–104

–50

THD

2nd

3rd