LTC1992 datasheet(1/24 Pages) LINER

Part #	LTC1992

Description	16-Bit, 2Msps, Low Power SAR ADC with 96dB SNR

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LTC2380-16

1

238016p

TYPICAL APPLICATION

FEATURES

DESCRIPTION

16-Bit, 2Msps, Low Power

SAR ADC with 96dB SNR

The LTC®2380-16 is a low noise, low power, high speed

16-bit successive approximation register (SAR) ADC.

Operating from a 2.5V supply, the LTC2380-16 has a

±VREF fully differential input range with VREF ranging from

2.5V to 5.1V. The LTC2380-16 consumes only 19mW and

achieves ±0.6LSB INL maximum, no missing codes at

16-bits with 96dB SNR.

The LTC2380-16 has a high speed SPI-compatible serial

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

also featuring a daisychain mode. The fast 2Msps through-

put with no cycle latency makes the LTC2380-16 ideally

suited for a wide variety of high speed applications. An

internal oscillator sets the conversion time, easing external

timing considerations. The LTC2380-16 automatically pow-

ers down between conversions, leading to reduced power

dissipation that scales with the sampling rate.

The LTC2380-16 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 = 2Msps, fIN = 2kHz

APPLICATIONS

n 2Msps Throughput Rate

n ±0.6LSB INL (Max)

n Guaranteed 16-Bit No Missing Codes

n Low Power: 19mW at 2Msps, 19μW at 2ksps

n 96dB SNR (typ) at fIN = 2kHz

n –117dB 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-pin 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)

0 100 200 300 400

1000

900

800

700

600

500

–180

–60

–40

–20

–80

–100

–120

–140

–160

0

238016 TA02

SNR = 96.4dB

THD = –119dB

SINAD = 96.3dB

SFDR = 122dB

VREF

20Ω

VREF

0V

VREF

0V

20Ω

3300pF

SAMPLE CLOCK

238016 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

LTC2380-16

VDD

OVDD

IN+

IN–

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

Technology Corporation. All other trademarks are the property of their respective owners.

Electrical Specifications Subject to Change

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