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LTC2377-20 データシート PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC2377-20
部品説明 Low Power SAR ADC
メーカ Linear Technology
ロゴ Linear Technology ロゴ 

Total 30 pages
		

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LTC2377-20 Datasheet, LTC2377-20 PDF,ピン配置, 機能
FEATURES
nn 500ksps Throughput Rate
nn ±0.5ppm INL (Typ)
nn Guaranteed 20-Bit No Missing Codes
nn Low Power: 10.5mW at 500ksps, 10.5µW at 500sps
nn 104dB SNR (Typ) at fIN = 2kHz
nn –125dB THD (Typ) at fIN = 2kHz
nn Digital Gain Compression (DGC)
nn Guaranteed Operation to 85°C
nn 2.5V Supply
nn Fully Differential Input Range ±VREF
nn VREF Input Range from 2.5V to 5.1V
nn No Pipeline Delay, No Cycle Latency
nn 1.8V to 5V I/O Voltages
nn SPI-Compatible Serial I/O with Daisy-Chain Mode
nn Internal Conversion Clock
nn 16-Lead MSOP and 4mm × 3mm DFN Packages
APPLICATIONS
nn Medical Imaging
nn High Speed Data Acquisition
nn Portable or Compact Instrumentation
nn Industrial Process Control
nn Low Power Battery-Operated Instrumentation
nn 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. Patents Pending. Protected by U.S. Patents, including
7705765, 7961132, 8319673.
LTC2377-20
20-Bit, 500ksps, Low Power
SAR ADC with 0.5ppm INL
DESCRIPTION
The LTC®2377-20 is a low noise, low power, high speed
20-bit successive approximation register (SAR) ADC. Op-
erating from a 2.5V supply, the LTC2377-20 has a ±VREF
fully differential input range with VREF ranging from 2.5V
to 5.1V. The LTC2377-20 consumes only 10.5mW and
achieves ±2ppm INL maximum, no missing codes at 20
bits with 104dB SNR.
The LTC2377-20 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 500ksps
throughput with no cycle latency makes the LTC2377-20
ideally suited for a wide variety of high speed applications.
An internal oscillator sets the conversion time, easing exter-
nal timing considerations. The LTC2377-20 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
The LTC2377-20 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
2.5V 1.8V TO 5V
10µF
0.1µF
VREF
0V
VREF
0V
+
10Ω
6800pF
VDD OVDD CHAIN
IN+
RDL/SDI
SDO
3300pF
LTC2377-20
SCK
10Ω
IN
6800pF
REF
BUSY
CNV
GND REF/DGC
2.5V TO 5.1V
237720 TA01
47µF
(X7R, 1210 SIZE)
SAMPLE CLOCK
VREF
For more information www.linear.com/LTC2377-20
Integral Nonlinearity vs Output Code
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
262144 524288 786432 1048576
OUTPUT CODE
237720 TA02
237720fa
1

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