LTC2378-18_15 datasheet(1/24 Pages) LINER

Part #	LTC2378-18

Description	18-Bit, 1Msps, Low Power SAR ADC with 102dB SNR

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Manufacturer	LINER [Linear Technology]

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LTC2378-18

1

237818f

TYPICAL APPLICATION

FEATURES

DESCRIPTION

18-Bit, 1Msps, Low Power

SAR ADC with 102dB SNR

The LTC®2378-18 is a low noise, low power, high speed

18-bit successive approximation register (SAR) ADC. Op-

erating from a 2.5V supply, the LTC2378-18 has a ±VREF

fully differential input range with VREF ranging from 2.5V

to 5.1V. The LTC2378-18 consumes only 13.5mW and

achieves ±1.75LSB INL maximum, no missing codes at

18 bits with 102dB SNR.

The LTC2378-18 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 through-

put with no cycle latency makes the LTC2378-18 ideally

suited for a wide variety of high speed applications. An

internal oscillator sets the conversion time, easing external

timing considerations. The LTC2378-18 automatically pow-

ers down between conversions, leading to reduced power

dissipation that scales with the sampling rate.

The LTC2378-18 features a unique digital gain compres-

sion (DGC) function, which eliminates the driver amplifier’s

negative supply while preserving the full resolution of the

ADC. When enabled, the ADC performs a digital scaling

function that maps zero-scale code from 0V to 0.1 • VREF

and full-scale code from VREF to 0.9 • VREF. For a typical

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.

32k Point FFT fS = 1Msps, fIN = 2kHz

APPLICATIONS

n 1Msps Throughput Rate

n ±1.75LSB INL (Max)

n Guaranteed 18-Bit No Missing Codes

n Low Power: 13.5mW at 1Msps, 13.5μW at 1ksps

n 102dB SNR (typ) at fIN = 2kHz

n –124dB THD (typ) at fIN = 2kHz

n Digital Gain Compression (DGC)

n Guaranteed Operation to 125°C

n 2.5V Supply

n Fully Differential Input Range ±VREF

n VREF Input Range from 2.5V to 5.1V

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

FREQUENCY (kHz)

0

100

200

300

500

400

–180

–60

–40

–20

–80

–100

–120

–140

–160

0

237818 TA02

SNR = 102.3dB

THD = –124dB

SINAD = 102.2dB

SFDR = 126dB

20Ω

VREF

0V

VREF

0V

20Ω

3300pF

6800pF

–

+

VREF

SAMPLE CLOCK

237818 TA01

10μF

0.1μF

2.5V

REF

1.8V TO 5V

2.5V TO 5.1V

47μF

(X5R, 0805 SIZE)

REF

GND

CHAIN

RDL/SDI

SDO

SCK

BUSY

CNV

REF/DGC

LTC2378-18

VDD

OVDD

IN+

IN–

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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