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參數(shù)資料
| 型號： | LTC2489IDETRPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface |
| 中文描述： | 16位2-/4-Channel ADC，具有易于驅(qū)動的輸入電流取消和I2C接口 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大小： | 341K |
| 代理商： | LTC2489IDETRPBF |
LTC2489
1
2489f
R
SOURCE
(
Ω
)
1
+
–20
0
20
1k
100k
2489 TA01b
–40
–60
–80
10
100
10k
40
60
80
V
CC
= 5V
V
= 5V
V
REF
= 3.75V
V
IN–
= 1.25V
F
O
= GND
T
A
= 25
°
C
C
IN
= 1
μ
F
16-Bit 2-/4-Channel
ΔΣ
ADC with Easy Drive Input Current
Cancellation and I
2
C Interface
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
The LTC
2489 is a 4-channel (2-channel differential),
16-bit, No Latency
ΔΣ
ADC with Easy Drive technology
and a 2-wire, I
2
C 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 V
CC
), 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.
Data Acquisition System with Temperature Compensation
■
Up to 2 Differential or 4 Single-Ended Inputs
■
Easy Drive
TM
Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
■
Directly Digitizes High Impedance Sensors with
Full Accuracy
■
2-Wire I
2
C Interface with 9 Addresses Plus One
Global Address for Synchronization
■
600nV RMS Noise (0.02LSB Transition Noise)
■
GND to V
CC
Input/Reference Common Mode Range
■
Simultaneous 50Hz/60Hz Rejection
■
2ppm INL, No Missing Codes
■
1ppm Offset and 15ppm Full-Scale Error
■
No Latency: Digital Filter Settles in a Single Cycle,
Even After a New Channel is Selected
■
Single Supply, 2.7V to 5.5V Operation (0.8mW)
■
Internal Oscillator
■
Tiny 4mm
×
3mm DFN Package
■
Direct Sensor Digitizer
■
Direct Temperature Measurement
■
Instrumentation
■
Industrial Process Control
+FS Error vs R
SOURCE
at IN
+
and IN
–
SDA
SCL
F
O
REF
+
V
CC
2.7V TO 5.5V
0.1
μ
F
COM
REF
–
16-BIT
ΔΣ
ADC
WITH EASY-DRIVE
4-CHANNEL
MUX
IN
+
IN
–
2489 TA01a
2-WIRE
I
C INTERFACE
1.7k
CA1
CA0
9-PIN SELECTABLE
ADDRESSES
CH0
CH1
CH3
CH2
10
μ
F
OSC
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No Latency
ΔΣ
and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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| LTC2489 | 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface |
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