Linear Technology DC955A - LTC2483 16-bit Delta-Sigma ADC demo board (req. DC590) DC955A DC955A 数据表
产品代码
DC955A
LTC2483
2483fc
Typical applicaTion
DescripTion
16-Bit
∆Σ ADC with Easy Drive
Input Current Cancellation
and I
2
C Interface
The LTC
®
2483 combines a 16-bit plus sign No Latency
∆∑™ analog-to-digital converter with patented Easy Drive
technology and I
2
C 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 LTC2483 allows a wide common mode input range
The LTC2483 allows a wide common mode input range
(0V to V
CC
) independent of the reference voltage. The
reference can be as low as 100mV or can be tied directly
to V
CC
. The noise level is 600nV
RMS
independent of V
REF
.
This allows direct digitization of low level signals with
16-bit accuracy. The LTC2483 includes an on-chip trimmed
oscillator, eliminating the need for external crystals or
oscillators and provides 87dB rejection of 50Hz and 60Hz
line frequency noise. Absolute accuracy and low drift are
automatically maintained through continuous, transparent,
offset and full-scale calibration.
+FS Error vs R
SOURCE
at IN
+
and IN
–
FeaTures
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
600nV
RMS
Noise, Independent of V
REF
n
GND to V
CC
Input/Reference Common Mode Range
n
2-Wire I
2
C Interface
n
Simultaneous 50Hz/60Hz Rejection
n
2ppm (0.25 LSB) INL, No Missing Codes
n
1ppm Offset and 15ppm Full-Scale Error
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
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
LTC2483
V
IN
+
REF
+
V
CC
V
CC
GND
V
IN
–
1µF
SDA
2-WIRE
I
I
2
C INTERFACE
0.1µF
10k
I
DIFF
= 0
10k
0.1µF
CA0/F
0
2483 TA01
CA1
SCL
6 ADDRESSES
REF
–
SENSE
R
SOURCE
(Ω)
1
+FS ERROR (ppm)
–20
0
20
1k
100k
–40
–60
–80
10
100
10k
40
60
80
V
CC
= 5V
V
REF
= 5V
V
IN
+
= 3.75V
V
IN
–
= 1.25V
F
O
= GND
T
A
= 25°C
C
IN
= 1µF
2483 TA02
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆∑ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Patents pending.