LTC2378-20

1

237820f

For more information www.linear.com/LTC2378-20

Typical applicaTion

FeaTures

DescripTion

20-Bit, 1Msps, Low Power

SAR ADC with 0.5ppm INL

The LTC®2378-20 is a low noise, low power, high speed

20-bit successive approximation register (SAR) ADC.

Operating from a 2.5V supply, the LTC2378-20 has a

2.5V to 5.1V. The LTC2378-20 consumes only 21mW and

achieves ±2ppm INL maximum, no missing codes at 20

bits with 104dB SNR.

The LTC2378-20 has a high speed SPI-compatible serial

interface that supports 1.8V, 2.5V, 3.3V and 5V logic

while also featuring a daisy-chain mode. The fast 1Msps

throughput with no cycle latency makes the LTC2378-20

ideally suited for a wide variety of high speed applications.

Aninternaloscillatorsetstheconversiontime,easingexter-

nal timing considerations. The LTC2378-20 automatically

powers down between conversions, leading to reduced

power dissipation that scales with the sampling rate.

The LTC2378-20 features a unique digital gain compres-

sion(DGC)function,whicheliminatesthedriveramplifier’s

negative supply while preserving the full resolution of the

ADC. When enabled, the ADC performs a digital scaling

reference voltage of 5V, the full-scale input range is now

0.5V to 4.5V, which provides adequate headroom for

powering the driving amplifier from a single 5.5V supply.

Integral Nonlinearity vs Output Code

applicaTions

n

1Msps Throughput Rate

n

±0.5ppm INL (Typ)

n

Guaranteed 20-Bit No Missing Codes

n

Low Power: 21mW at 1Msps, 21µW at 1ksps

n

n

n

Digital Gain Compression (DGC)

n

Guaranteed Operation to 85°C

n

2.5V Supply

n

n

n

No Pipeline Delay, No Cycle Latency

n

1.8V to 5V I/O Voltages

n

SPI-Compatible Serial I/O with Daisy-Chain Mode

n

Internal Conversion Clock

n

16-Lead MSOP and 4mm

× 3mm DFN Packages

n

Medical Imaging

n

High Speed Data Acquisition

n

Portable or Compact Instrumentation

n

Industrial Process Control

n

Low Power Battery-Operated Instrumentation

n

ATE

OUTPUT CODE

0

262144

524288

786432

1048576

–2.0

0.5

1.0

1.5

0

–0.5

–1.0

–1.5

2.0

237820 TA02

10

0V

0V

10

3300pF

6800pF

6800pF

–

+

SAMPLE CLOCK

237820 TA01

10µF

0.1µF

2.5V

REF

1.8V TO 5V

2.5V TO 5.1V

47µF

(X7R, 1210 SIZE)

REF

GND

CHAIN

RDL/SDI

SDO

SCK

BUSY

CNV

REF/DGC

LTC2378-20

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. Patents Pending. Protected by U.S. Patents, including

7705765, 7961132, 8319673.