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參數資料
型號: LTC2484IDD#TRPBF
廠商: Linear Technology
文件頁數: 1/42頁
文件大小: 0K
描述: IC ADC 24BIT 10-DFN
標準包裝: 2,500
位數: 24
采樣率(每秒): 6.8
數據接口: MICROWIRE?,串行,SPI?
轉換器數目: 1
功率耗散(最大): 480µW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-WFDFN 裸露焊盤
供應商設備封裝: 10-DFN(3x3)
包裝: 帶卷 (TR)
輸入數目和類型: 1 個差分,雙極
配用: DC939A-ND - BOARD DELTA SIGMA ADC LTC2484
LTC2484
1
2484fd
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
24-Bit
Σ ADC with
Easy Drive Input Current Cancellation
The LTC
2484 combines a 24-bit No Latency
Σanalog-
to-digital converter with patented Easy Drive technology.
The patented sampling scheme eliminates dynamic input
current errors and the shortcomings of on-chip buffering
through automatic cancellation of differential input current.
This allows large external source impedances and input
signals with rail-to-rail input range to be directly digitized
while maintaining exceptional DC accuracy.
The LTC2484 includes an on-chip temperature sensor and
oscillator. The LTC2484 can be congured to measure an
external signal or internal temperature sensor and reject
line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz
line frequency rejection can be selected as well as a 2
×
speed-up mode.
The LTC2484 allows a wide common mode input range
(0V to VCC) independent of the reference voltage. The
reference can be as low as 100mV or can be tied directly
to VCC. The LTC2484 includes an on-chip trimmed oscil-
lator, eliminating the need for external crystals or oscil-
lators. Absolute accuracy and low drift are automatically
maintained through continuous, transparent, offset and
full-scale calibration.
n Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n 600nVRMS Noise
n Integrated Temperature Sensor
n GND to VCC Input/Reference Common Mode Range
n Programmable 50Hz, 60Hz or Simultaneous
50Hz/60Hz Rejection Mode
n 2ppm INL, No Missing Codes
n 1ppm Offset and 15ppm Total Unadjusted Error
n Selectable 2
× Speed Mode (15Hz Using Internal
Oscillator)
n No Latency: Digital Filter Settles in a Single Cycle
n Single Supply 2.7V to 5.5V Operation
n Internal Oscillator
n Available in a Tiny (3mm
× 3mm) 10-Lead
DFN Package
n Direct Sensor Digitizer
n Weight Scales
n Direct Temperature Measurement
n Strain Gauge Transducers
n Instrumentation
n Industrial Process Control
n DVMs and Meters
L, LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency
Σ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Patents pending.
LTC2484
VREF
VCC
GND
fO
1μF
SDO
4-WIRE
SPI INTERFACE
0.1μF
10k
IDIFF = 0
10k
0.1μF
SCK
2484 TA01
CS
SDI
SENSE
VIN
+
VIN
RSOURCE (Ω)
1
+FS
ERROR
(ppm)
–20
0
20
1k
100k
2484 TA02
–40
–60
–80
10
100
10k
40
60
80
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
= 1.25V
fO = GND
TA = 25°C
CIN = 1μF
+FS Error vs RSOURCE at IN+ and IN
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