LTC2379-18

1

237918p

TYPICAL APPLICATION

FEATURES

DESCRIPTION

18-Bit, 1.6Msps, Low Power

SAR ADC with 101dB SNR

18-bit successive approximation register (SAR) ADC.

Operating from a 2.5V supply, the LTC2379-18 has a ±

2.5V to 5.1V. The LTC2379-18 consumes only 18mW

and achieves ±2LSB INL maximum, no missing codes at

18-bits with 101dB SNR.

The LTC2379-18 has a high speed SPI-compatible se-

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

while also featuring a daisychain mode. The fast 1.6Msps

throughput with no cycle latency makes the LTC2379-18

ideally suited for a wide variety of high speed applications.

An internal oscillator sets the conversion time, easing exter-

nal timing considerations. The LTC2379-18 automatically

powers down between conversions, leading to reduced

power dissipation that scales with the sampling rate.

The LTC2379-18 offers a digital gain compression (DGC)

feature that allows a full-scale input to be achieved with

analog input range. This allows the input buffer ampli-

fier to be operated from a single positive supply without

headroom issues, resulting in a lower power system.

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.

APPLICATIONS

× 3mm DFN Packages

FREQUENCY (kHz)

0

100 200 300 400

800

700

600

500

–180

–60

–40

–20

–80

–100

–120

–140

–160

0

237918 TA02

SNR = 101.2dB

THD = –120dB

SINAD = 101.1dB

SFDR = 121dB

20Ω

0V

0V

20Ω

3300pF

3300pF

3300pF

–

+

SAMPLE CLOCK

237918 TA01

10μF

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

LTC2379-18

Electrical Specifications Subject to Change