Linear Technology LTC2379-18 with LTC6655-5/LT6350: 18-Bit, 1.6Msps, SAR ADC with 101dB SNR. Req DC718 or DC590 DC1783A- DC1783A-E Scheda Tecnica

LTC2379-18

1

237918fa

18-Bit, 1.6Msps, Low Power

SAR ADC with 101.2dB SNR

The LTC

®

2379-18 is a low noise, low power, high speed 

18-bit successive approximation register (SAR) ADC. 
Operating from a 2.5V supply, the LTC2379-18 has a 
±V

REF

 fully differential input range with V

REF

 ranging from 

2.5V to 5.1V. The LTC2379-18 consumes only 18mW and 
achieves ±2LSB INL maximum, no missing codes at 18 bits 
with 101.2dB SNR.

The LTC2379-18 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 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 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 • V

REF

 

and full-scale code from V

REF

 to 0.9 • V

REF

. 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.

n

  1.6Msps Throughput Rate

n

  ±2LSB INL (Max)

n

  Guaranteed 18-Bit No Missing Codes

n

  Low Power: 18mW at 1.6Msps, 18μW at 1.6ksps

n

  101.2dB SNR (typ) at f

n

  –120dB THD (typ) at f

n

  Digital Gain Compression (DGC)

n

  Guaranteed Operation to 125°C

n

 2.5V Supply

n

  Fully Differential Input Range ±V

REF

n

  V

REF

 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

100 200 300 400

800

700

600

500

–180

AMPLITUDE (dBFS)

–60

–40

–20

–80

–100

–120

–140

–160

0

237918 TA02

SNR = 101.2dB
THD = –120dB
SINAD = 101.1dB
SFDR = 121dB

20Ω

V

REF

0V

V

REF

0V

20Ω

3300pF

3300pF

3300pF

–

+

V

REF

SAMPLE CLOCK

237918 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

LTC2379-18

V

DD

OV

DD

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. Protected by U.S. Patents including 7705765.