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| 型号： | DC1783A-F |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2378-18 |
| 软件下载： | QuikEval II System |
| 设计资源： | DC1783A Design Files DC1783A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，SPI? |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 13.5mW @ 1MSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2378-18 |
| 已供物品： | 板 |
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LTC2378-18
1
237818f
TYPICAL APPLICATION
FEATURES
DESCRIPTION
18-Bit, 1Msps, Low Power
SAR ADC with 102dB SNR
The LTC2378-18 is a low noise, low power, high speed
18-bit successive approximation register (SAR) ADC. Op-
erating from a 2.5V supply, the LTC2378-18 has a ±VREF
fully differential input range with VREF ranging from 2.5V
to 5.1V. The LTC2378-18 consumes only 13.5mW and
achieves ±1.75LSB INL maximum, no missing codes at
18 bits with 102dB SNR.
The LTC2378-18 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 1Msps through-
put with no cycle latency makes the LTC2378-18 ideally
suited for a wide variety of high speed applications. An
internal oscillator sets the conversion time, easing external
timing considerations. The LTC2378-18 automatically pow-
ers down between conversions, leading to reduced power
dissipation that scales with the sampling rate.
The LTC2378-18 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.
32k Point FFT fS = 1Msps, fIN = 2kHz
APPLICATIONS
n 1Msps Throughput Rate
n ±1.75LSB INL (Max)
n Guaranteed 18-Bit No Missing Codes
n Low Power: 13.5mW at 1Msps, 13.5μW at 1ksps
n 102dB SNR (typ) at fIN = 2kHz
n –124dB 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
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
500
400
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
237818 TA02
SNR = 102.3dB
THD = –124dB
SINAD = 102.2dB
SFDR = 126dB
20Ω
VREF
0V
VREF
0V
20Ω
3300pF
6800pF
–
+
VREF
SAMPLE CLOCK
237818 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
LTC2378-18
VDD
OVDD
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.
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