LTC2379CDE-18 LINEAR [Linear Integrated Systems], LTC2379CDE-18 Datasheet

LTC2379CDE-18

Manufacturer Part Number

LTC2379CDE-18

Description

LTC2379-1818-Bit, 1.6Msps, Low Power SAR ADC with 101.2dB SNR

Manufacturer

LINEAR [Linear Integrated Systems]

Datasheet

1.LTC2379CDE-18.pdf (26 pages)

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FEATURES

APPLICATIONS

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.

TYPICAL APPLICATION

REF

1.6Msps Throughput Rate

±2LSB INL (Max)

Guaranteed 18-Bit No Missing Codes

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

101.2dB SNR (typ) at f

–120dB THD (typ) at f

Digital Gain Compression (DGC)

Guaranteed Operation to 125°C

2.5V Supply

Fully Differential Input Range ±V

No Pipeline Delay, No Cycle Latency

1.8V to 5V I/O Voltages

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

Internal Conversion Clock

16-Lead MSOP and 4mm × 3mm DFN Packages

Medical Imaging

High Speed Data Acquisition

Portable or Compact Instrumentation

Industrial Process Control

Low Power Battery-Operated Instrumentation

ATE

REF

Input Range from 2.5V to 5.1V

–

20Ω

= 2kHz

3300pF

2.5V TO 5.1V

REF

–

10μF

LTC2379-18

2.5V

REF

47μF

(X5R, 0805 SIZE)

1.8V TO 5V

GND

REF/DGC

RDL/SDI

CHAIN

BUSY

SDO

CNV

SCK

237918 TA01

0.1μF

SAR ADC with 101.2dB SNR

DESCRIPTION

The LTC

18-bit successive approximation register (SAR) ADC.

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

±V

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

and full-scale code from V

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.

18-Bit, 1.6Msps, Low Power

REF

SAMPLE CLOCK

REF

fully differential input range with V

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

–100

–120

–140

–160

–180

–20

–40

–60

–80

32k Point FFT f

REF

100 200 300 400

to 0.9 • V

LTC2379-18

FREQUENCY (kHz)

= 1.6Msps, f

REF

500

. For a typical

ranging from

SNR = 101.2dB

THD = –120dB

SINAD = 101.1dB

SFDR = 121dB

600

700

237918 TA02

= 2kHz

237918fa

REF

800

Related parts for LTC2379CDE-18

LTC2379CDE-18 Summary of contents

Page 1

FEATURES 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 2kHz IN n –120dB THD (typ ...

... LTC2379IMS-18#TRPBF LTC2379HMS-18#PBF LTC2379HMS-18#TRPBF LTC2379CDE-18#PBF LTC2379CDE-18#TRPBF LTC2379IDE-18#PBF LTC2379IDE-18#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER + V + Absolute Input Range ( – V – Absolute Input Range ( – V – Input Differential Voltage Range IN IN ...

Page 4

LTC2379-18 REFERENCE INPUT The specifications are 25°C. (Note 4) A SYMBOL PARAMETER V Reference Voltage REF I Reference Input Current REF V High Level Input Voltage REF/DGC Pin IHDGC V Low Level Input Voltage REF/DGC Pin ILDGC ...

Page 5

ADC TIMING CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER t SCK Low Time SCKL t SDI Setup Time From SCK↑ SSDISCK t SDI Hold Time From SCK↑ HSDISCK t SCK Period in Chain Mode SCKCH t SDO ...

Page 6

LTC2379-18 TYPICAL PERFORMANCE CHARACTERISTICS REF = 5V 1.6Msps, unless otherwise noted. SMPL Integral Nonlinearity vs Output Code 2.0 1.5 1.0 0.5 0.0 –0.5 –1.0 –1.5 –2.0 0 65536 131072 196608 262144 OUTPUT CODE 237918 G01 32k Point FFT ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS REF = 5V 1.6Msps, unless otherwise noted. SMPL SNR, SINAD vs Temperature 2kHz IN 103 SNR 102 SINAD 101 100 –55 –35 – 105 ...

Page 8

LTC2379-18 PIN FUNCTIONS CHAIN (Pin 1): Chain Mode Selector Pin. When low, the LTC2379-18 operates in normal mode and the RDL/SDI input pin functions to enable or disable SDO. When high, the LTC2379-18 operates in chain mode and the RDL/SDI ...

Page 9

TIMING DIAGRAM CHAIN, RDL/SDI = 0 CNV CONVERT BUSY SCK SDO Conversion Timing Using the Serial Interface POWER-DOWN AND ACQUIRE D17 D16 D15 D14 D13 D12 D11 D10 LTC2379-18 237918 ...

Page 10

LTC2379-18 APPLICATIONS INFORMATION OVERVIEW The LTC2379- low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Operating from a single 2.5V supply, the LTC2379-18 supports a large and flexible ±V REF range with V ranging from ...

Page 11

APPLICATIONS INFORMATION INPUT DRIVE CIRCUITS A low impedance source can directly drive the high im- pedance inputs of the LTC2379-18 without gain error. A high impedance source should be buffered to minimize settling time during acquisition and to optimize the ...

Page 12

LTC2379-18 APPLICATIONS INFORMATION LT6350 INT INT 0V – 1 – – CM Figure 5a. LT6350 Converting a 0V-5V Single-Ended Signal to a ±5V Differential Input Signal 0 SNR = ...

Page 13

APPLICATIONS INFORMATION 5V 4.5V 0.5V 0V Figure 8. Input Swing of the LTC2379 with Gain Compression Enabled positive supply to power the LT6350 results in additional power savings for the entire system. Figure 9a shows how to configure the LT6350 ...

Page 14

LTC2379-18 APPLICATIONS INFORMATION 0μ maximum of 1.3mA at 1.6Msps. This step in DC current draw triggers a transient response in the reference that must be considered since any deviation in the refer- ence output voltage will affect the ...

Page 15

APPLICATIONS INFORMATION reinitialize the ADC. No conversions should be initiated until 20μs after a POR event to ensure the reinitialization period has ended. Any conversions initiated before this time will produce invalid results. TIMING AND CONTROL CNV Timing The LTC2379-18 ...

Page 16

LTC2379-18 TIMING DIAGRAMS Normal Mode, Single Device When CHAIN = 0, the LTC2379-18 operates in normal mode. In normal mode, RDL/SDI enables or disables the serial data output pin SDO. If RDL/SDI is high, SDO is in high impedance. If ...

Page 17

TIMING DIAGRAMS Normal Mode, Multiple Devices Figure 14 shows multiple LTC2379-18 devices operating in normal mode (CHAIN = 0) sharing CNV, SCK and SDO. By sharing CNV, SCK and SDO, the number of required signals to operate multiple ADCs in ...

Page 18

LTC2379-18 TIMING DIAGRAMS Chain Mode, Multiple Devices When CHAIN = OV , the LTC2379-18 operates in chain DD mode. In chain mode, SDO is always enabled and RDL/SDI serves as the serial data input pin (SDI) where daisy-chain data output ...

Page 19

BOARD LAYOUT To obtain the best performance from the LTC2379-18 a printed circuit board is recommended. Layout for the printed circuit board (PCB) should ensure the digital and analog signal lines are separated as much as possible. In particular, care ...

Page 20

LTC2379-18 BOARD LAYOUT 20 Partial Layer 1 Component Side Partial Layer 2 Ground Plane 237918fa ...

Page 21

BOARD LAYOUT Partial Layer 3 PWR Plane Partial Layer 4 Bottom Layer LTC2379-18 237918fa 21 ...

Page 22

LTC2379-18 BOARD LAYOUT 22 Partial Schematic of Demoboard REF/DGC 8 REF 1 GND 7 DD GND GND GND 237918fa ...

Page 23

PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ 3.30 ±0.05 3.60 ±0.05 2.20 ±0.05 1.70 ± 0.05 0.25 ± 0.05 0.45 BSC 3.15 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED for the most ...

Page 24

LTC2379-18 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ 0.889 0.127 (.035 .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.50 0.305 0.038 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT ...

Page 25

REVISION HISTORY REV DATE DESCRIPTION Updated θ Pin Configuration JA Updated specifications in Electrical Characteristics Dynamic Accuracy and Power Requirements sections Updated Note 4 Replaced Graphs G13 and Figure 12 Updated Figure 15 Updated Related Parts ...

Page 26

LTC2379-18 TYPICAL APPLICATION LT6350 Configured to Accept a ±10V Input Signal While Running Off of a Single 5.5V Supply When Digital Gain Compression Is Enabled in the LTC2379- 10μF 1k LT6350 6.04k 10μF 4.32k 10V R = ...

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