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参数资料
| 型号： | LTC2489IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT DELTA SIG 14-DFN |
| 标准包装： | 91 |
| 位数： | 16 |
| 采样率（每秒）： | 7.5 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 480µW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 管件 |
| 输入数目和类型： | 4 个单端，双极；2 个差分，双极 |
| 产品目录页面： | 1348 (CN2011-ZH PDF) |
| 配用： | DC1010A-B-ND - BOARD DELTA SIGMA ADC LTC2489 |
LTC2489
1
2489fa
16-Bit 2-/4-Channel
ΔΣ ADC
with Easy Drive Input Current
Cancellation and I2C Interface
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
The LTC2489 is a 4-channel (2-channel differential),
16-bit, No Latency
ΔΣ ADC with Easy Drive technology
and a 2-wire, I2C interface. The patented sampling scheme
eliminates dynamic input current errors and the shortcom-
ings of on-chip buffering through automatic cancellation of
differential input current. This allows large external source
impedances and rail-to-rail input signals to be directly
digitized while maintaining exceptional DC accuracy.
The LTC2489 includes an integrated oscillator. This device
can be configured to measure an external signal from com-
binations of 4 analog input channels operating in single-
ended or differential modes. It automatically rejects line
frequencies of 50Hz and 60Hz simultaneously.
The LTC2489 allows a wide, common mode input range
(0V to VCC), independent of the reference voltage. Any
combination of single-ended or differential inputs can be
selected and the first conversion, after a new channel is
selected, is valid. Access to the multiplexer output enables
optional external amplifiers to be shared between all
analog inputs and auto calibration continuously removes
their associated offset and drift.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Easy Drive and No Latency
ΔΣ are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Data Acquisition System with Temperature Compensation
n Up to 2 Differential or 4 Single-Ended Inputs
n Easy DriveTM Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n 2-Wire I2C Interface with 9 Addresses Plus One
Global Address for Synchronization
n 600nV RMS Noise (0.02LSB Transition Noise)
n GND to VCC Input/Reference Common Mode Range
n Simultaneous 50Hz/60Hz Rejection
n 2ppm INL, No Missing Codes
n 1ppm Offset and 15ppm Full-Scale Error
n No Latency: Digital Filter Settles in a Single Cycle,
Even After a New Channel is Selected
n Single Supply, 2.7V to 5.5V Operation (0.8mW)
n Internal Oscillator
n Tiny 4mm
× 3mm DFN Package
n Direct Sensor Digitizer
n Direct Temperature Measurement
n Instrumentation
n Industrial Process Control
+FS Error vs RSOURCE at IN+ and IN–
SDA
SCL
fO
REF+
VCC
2.7V TO 5.5V
0.1μF
COM
REF–
16-BIT
ADC
WITH EASY-DRIVE
4-CHANNEL
MUX
IN+
IN–
2489 TA01a
2-WIRE
I2C INTERFACE
1.7k
CA1
CA0
9-PIN SELECTABLE
ADDRESSES
CH0
CH1
CH3
CH2
10μF
OSC
RSOURCE (Ω)
1
+FS
ERROR
(ppm)
–20
0
20
1k
100k
2489 TA01b
–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
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