LTC2483 Datasheet, PDF (1/32 Pages) Linear Technology – 16-Bit ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface

LTC2483
16-Bit ∆Σ ADC with Easy Drive
Input Current Cancellation and I²C Interface
FEATURES
■ _{Easy Drive Technology Enables Rail-to-Rail Inputs}
with Zero Differential Input Current
■ _{Directly Digitizes High Impedance Sensors with}
Full Accuracy
■ _{600nV RMS Noise, Independent of VREF}
■ _{GND to VCC Input/Reference Common Mode Range}
■ _{2-Wire I}²_{C Interface}
■ _{Simultaneous 50Hz/60Hz Rejection}
■ _{2ppm (0.25LSB) INL, No Missing Codes}
■ _{1ppm Offset and 15ppm Full-Scale Error}
■ _{No Latency: Digital Filter Settles in a Single Cycle}
■ _{Single Supply 2.7V to 5.5V Operation}
■ _{Internal Oscillator}
■ _{Six Addresses Available and One Global Address for}
Synchronization
■ _{Available in a Tiny (3mm × 3mm) 10-Lead}
DFN Package
U
APPLICATIO S
■ _{Direct Sensor Digitizer}
■ _{Weight Scales}
■ _{Direct Temperature Measurement}
■ _{Strain Gauge Transducers}
■ _{Instrumentation}
■ _{Industrial Process Control}
■ _{DVMs and Meters}
DESCRIPTIO
The LTC^®2483 combines a 16-bit plus sign No Latency ∆Σ^TM
analog-to-digital converter with patented Easy Drive^TM tech-
nology 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 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, transpar-
ent, offset and full-scale calibration.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Patent Pending.
TYPICAL APPLICATIO
V_CC
1µF
10k
SENSE
10k
I_DIFF = 0
1µF
REF⁺
V_IN+
V_CC
LTC2483
V_IN–
GND
REF^–
SCL
2-WIRE
SDA I²C INTERFACE
CA0/F₀
CA1
2483 TA01
6 ADDRESSES
+FS Error vs R_SOURCE at IN⁺ and IN^–
80
V_CC = 5V
60
40
VVV_{RIINNE+–F}
=
=
=
5V
3.75V
1.25V
F_O = GND
20 ^{TA = 25°C}
0
C_IN = 1µF
–20
–40
–60
–80
1
10
100
1k
10k 100k
R_SOURCE (Ω)
2483 TA02
2483f
1