LTC2471_15 Datasheet, PDF (1/20 Pages) Linear Technology – Selectable 208sps/833sps, 16-Bit I2C ADCs with 10ppm/C Max Precision Reference

LTC2471/LTC2473
Selectable 208sps/833sps,
16-Bit I²C ΔΣ ADCs with 10ppm/°C
Max Precision Reference
Features
Description
n _{16-Bit Resolution}
n _{Internal, High Accuracy Reference—10ppm/°C (Max)}
n _{Single-Ended (LTC2471) or Differential (LTC2473)}
n _{Selectable 208sps/833sps Output Rate}
n _{1mV Offset Error}
n _{0.01% Gain Error}
n _{Single Conversion Settling Time Simplifies}
Multiplexed Applications
n _{Single-Cycle Operation with Auto Shutdown}
n _{3.5mA (Typ) Supply Current}
n _{2µA (Max) Sleep Current}
n _{Internal Oscillator—No External Components}
Required
n _I²_{C Interface}
n _{Small 12-Lead, 3mm × 3mm DFN and MSOP}
Packages
The LTC^®2471/LTC2473 are small, 16-bit analog-to-digital
converters with an integrated precision reference and
a selectable 208sps or 833sps output rate. They use a
single 2.7V to 5.5V supply and communicate through an
I²C Interface. The LTC2471 is single-ended with a 0V to
V_REF input range and the LTC2473 is differential with a
±V_REF input range. Both ADCs include a 1.25V integrated
reference with 2ppm/°C drift performance and 0.1% initial
accuracy. The converters are available in a 12-pin DFN
3mm × 3mm package or an MSOP-12 package. They
include an integrated oscillator and perform conversions
with no latency for multiplexed applications. The LTC2471/
LTC2473 include a proprietary input sampling scheme
that reduces the average input current several orders of
magnitude when compared to conventional delta sigma
converters.
Applications
n _{System Monitoring}
n _{Environmental Monitoring}
n _{Direct Temperature Measurements}
n _{Instrumentation}
n _{Industrial Process Control}
n _{Data Acquisition}
n _{Embedded ADC Upgrades}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation and Easy Drive and No Latency ∆∑ is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.
Patents, including 6208279, 6411242, 7088280, 7164378.
Following a single conversion, the LTC2471/LTC2473
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 LTC2471/LTC2473 include a user selectable 208sps
or 833sps output rate and due to a large oversampling
ratio (8,192 at 208sps and 2,048 at 833sps) have relaxed
anti-aliasing requirements.
Typical Application
2.7V TO 5.5V
0.1µF
0.1µF
0.1µF
10µF
0.1µF
REFOUT
COMP V_CC
10k
10k
IN⁺
SCL
I²C
LTC2473
SDA
INTERFACE
IN^–
10k
R
0.1µF
REF^–
AO
GND
24713 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
24713 TA01b
For more information www.linear.com/LTC2471
24713fb
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