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Linear Technology Electronic Components Datasheet

LTC2379-18 Datasheet

Low Power SAR ADC

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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) at fIN = 2kHz
n120dB 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
APPLICATIONS
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
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.
LTC2379-18
18-Bit, 1.6Msps, Low Power
SAR ADC with 101.2dB SNR
DESCRIPTION
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
±VREF fully differential input range with VREF 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 • 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.
TYPICAL APPLICATION
VREF
0V
VREF
0V
2.5V 1.8V TO 5V
10µF
0.1µF
+
20Ω
3300pF
VDD OVDD CHAIN
IN+
RDL/SDI
SDO
3300pF
LTC2379-18
SCK
20Ω
IN
3300pF
REF
BUSY
CNV
GND REF/DGC
SAMPLE CLOCK
VREF
2.5V TO 5.1V
237918 TA01
47µF
(X5R, 0805 SIZE)
For more information www.linear.com/LTC2379-18
32k Point FFT fS = 1.6Msps, fIN = 2kHz
0 SNR = 101.2dB
–20 THD = –120dB
SINAD = 101.1dB
–40 SFDR = 121dB
–60
–80
–100
–120
–140
–160
–180
0
100 200 300 400 500 600 700 800
FREQUENCY (kHz)
237918 TA02
237918fb
1


Linear Technology Electronic Components Datasheet

LTC2379-18 Datasheet

Low Power SAR ADC

No Preview Available !

LTC2379-18
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VDD)................................................2.8V
Supply Voltage (OVDD).................................................6V
Reference Input (REF)..................................................6V
Analog Input Voltage (Note 3)
IN+, IN.......................... (GND –0.3V) to (REF + 0.3V)
REF/DGC Input (Note 3)..... (GND –0.3V) to (REF + 0.3V)
Digital Input Voltage
(Note 3)............................ (GND –0.3V) to (OVDD + 0.3V)
Digital Output Voltage
(Note 3)............................ (GND –0.3V) to (OVDD + 0.3V)
Power Dissipation............................................... 500mW
Operating Temperature Range
LTC2379C................................................. 0°C to 70°C
LTC2379I..............................................–40°C to 85°C
LTC2379H........................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
CHAIN
VDD
GND
IN+
IN
GND
REF
REF/DGC
1
2
3
4
5
6
7
8
TOP VIEW
17
GND
16 GND
15 OVDD
14 SDO
13 SCK
12 RDL/SDI
11 BUSY
10 GND
9 CNV
DE PACKAGE
16-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
CHAIN 1
GVIINDNNDD+–
2
3
4
5
GND 6
REF 7
REF/DGC 8
16 GND
15
14
SODVDOD
13 SCK
12 RDL/SDI
11 BUSY
10 GND
9 CNV
MS PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 110°C/W
ORDER INFORMATION http://www.linear.com/product/LTC2379-18#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2379CMS-18#PBF
LTC2379CMS-18#TRPBF 237918
16-Lead Plastic MSOP
0°C to 70°C
LTC2379IMS-18#PBF
LTC2379IMS-18#TRPBF 237918
16-Lead Plastic MSOP
–40°C to 85°C
LTC2379HMS-18#PBF
LTC2379HMS-18#TRPBF 237918
16-Lead Plastic MSOP
–40°C to 125°C
LTC2379CDE-18#PBF
LTC2379CDE-18#TRPBF 23798
16-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LTC2379IDE-18#PBF
LTC2379IDE-18#TRPBF 23798
16-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
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.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
For more information www.linear.com/LTC2379-18
237918fb


Part Number LTC2379-18
Description Low Power SAR ADC
Maker Linear Technology Corporation
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