LTC2483_15 Datasheet, PDF (1/34 Pages) Linear Technology – 16-Bit 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
Description
n _{Easy Drive™ Technology Enables Rail-to-Rail}
Inputs with Zero Differential Input Current
n _{Directly Digitizes High Impedance Sensors with}
Full Accuracy
n _{600nVRMS Noise, Independent of VREF}
n _{GND to VCC 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
Applications
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}
The LTC^® 2483 combines a 16-bit plus sign No Latency
∆∑™ 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 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.
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.
Typical Application
V_CC
0.1µF
10k
SENSE
I_DIFF = 0
10k
0.1µF
V_IN+ ^REF+
V_CC
LTC2483
V_IN–
GND
REF ^–
1µF
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
2483fc