LTC2461_15 Datasheet, PDF (1/20 Pages) Linear Technology – Ultra-Tiny, 16-Bit I2C ADCs with 10ppm/C Max Precision Reference

FEATURES
n _{16-Bit Resolution, No Missing Codes}
n _{Internal Reference, High Accuracy 10ppm/°C (Max)}
n _{Single-Ended (LTC2461) or Differential (LTC2463)}
n _{2LSB Offset Error (Typ)}
n _{0.01% Gain Error (Typ)}
n _{60 Conversions Per Second}
n _{Single Conversion Settling Time for Multiplexed}
Applications
n _{1.5mA Supply Current}
n _{200nA Sleep Current}
n _{Internal Oscillator—No External Components}
Required
n _{2-Wire I}²_{C Interface with Two Addresses Plus One}
Global Address for Synchronization
n _{Ultra-Tiny, 12-Lead, 3mm × 3mm DFN and MSOP}
Packages
APPLICATIONS
n _{System Monitoring}
n _{Environmental Monitoring}
n _{Direct Temperature Measurements}
n _{Instrumentation}
n _{Data Acquisition}
n _{Embedded ADC Upgrades}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6208279, 6411242, 7088280, 7164378.
LTC2461/LTC2463
Ultra-Tiny, 16-Bit I²C ΔΣ
ADCs with 10ppm/°C Max
Precision Reference
DESCRIPTION
The LTC^®2461/LTC2463 are ultra tiny, 16-Bit analog-to-
digital converters with an integrated precision reference.
They use a single 2.7V to 5.5V supply and communicate
through an I²C Interface. The LTC2461 is single-ended
with a 0V to 1.25V input range and the LTC2463 is dif-
ferential with a 1.25V input range. Both ADCs include a
1.25V integrated reference with 2ppm/°C drift perfor-
mance and 0.1% initial accuracy. The converters are
available in a 12-pin 3mm × 3mm DFN package or an
MSOP-12 package. They include an integrated oscillator
and perform conversions with no latency for multiplexed
applications. The LTC2461/LTC2463 include a proprietary
input sampling scheme that reduces the average input
current several orders of magnitude when compared to
conventional delta sigma converters.
Following a single conversion, the LTC2461/LTC2463
automatically power down the converter and can also be
configured to power down the reference. When both the
ADC and reference are powered down, the supply current
is reduced to 200nA.
The LTC2461/LTC2463 can sample at 60 conversions per
second and, due to the very large oversampling ratio,
have extremely relaxed antialiasing requirements. Both
include continuous internal offset and fullscale calibration
algorithms which are transparent to the user, ensuring ac-
curacy over time and the operating temperature range.
TYPICAL APPLICATION
2.7V TO 5.5V
0.1µF
0.1µF
0.1µF
10µF
0.1µF
REFOUT
COMP V_CC
10k
10k
IN⁺
IN^–
LTC2463
SCL
SDA
I²C
INTERFACE
10k
R
0.1µF
REF^–
A0
GND
24613 TA01a
V_REF vs Temperature
1.2520
1.2515
1.2510
1.2505
1.2500
1.2495
1.2490
1.2485
1.2480
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
24613 TA01b
24613fa
1