參數(shù)資料
型號(hào)： LTC2485CDD#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 1/40頁(yè)
文件大?。?/td> 0K
描述： IC ADC 24BIT I2C 10-DFN
標(biāo)準(zhǔn)包裝： 121
位數(shù)： 24
采樣率（每秒）： 6.8
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 480µW
電壓電源： 單電源
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 10-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 10-DFN（3x3）
包裝： 管件
輸入數(shù)目和類型： 1 個(gè)差分，雙極
產(chǎn)品目錄頁(yè)面： 1348 (CN2011-ZH PDF)
配用： DC956A-ND - BOARD DELTA SIGMA ADC LTC2485
LTC2485
1
2485fc
TYPICAL APPLICATION
FEATURES
DESCRIPTION
24-Bit ΔΣ ADC with Easy Drive
Input Current Cancellation
and I2C Interface
The LTC2485 combines a 24-bit plus sign No Latency
ΔΣ analog-to-digital converter with patented Easy Drive
technology and I2C digital interface. 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 LTC2485 includes on-chip temperature sensor and
an oscillator. The LTC2485 can be congured through
an I2C interface 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 2x speed-up mode.
The LTC2485 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 LTC2485 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency Δ∑ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
+FS Error vs RSOURCE at IN+ and IN–
APPLICATIONS
n Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n Integrated Temperature Sensor
n GND to VCC Input/Reference Common Mode Range
n 2-Wire I2C Interface
n Programmable 50Hz, 60Hz or Simultaneous
50Hz/60Hz Rejection Mode
n 2ppm (0.25LSB) INL, No Missing Codes
n 1ppm Offset and 15ppm Full-Scale Error
n Selectable 2x Speed Mode
n No Latency: Digital Filter Settles in a Single Cycle
n Single Supply 2.7V to 5.5V Operation
n Internal Oscillator
n Six Addresses Available and One Global Address for
Synchronization
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
LTC2485
VIN
+
REF+
VCC
GND
VIN
–
1μF
SDA
2-WIRE
I2C INTERFACE
0.1μF
10k
IDIFF = 0
10k
CA0/f0
2485 TA01a
CA1
SCL
6 ADDRESSES
REF–
SENSE
0.1μF
RSOURCE (Ω)
1
+FS
ERROR
(ppm)
–20
0
20
1k
100k
–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
2485 TA01b
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