LTC2470_15 Datasheet, PDF (1/22 Pages) Linear Technology – Selectable 208sps/833sps, 16-Bit ADCs with 10ppm/C Max Precision Reference

LTC2470/LTC2472
Features
Selectable 208sps/833sps,
16-Bit ΔΣ ADCs with 10ppm/°C
Max Precision Reference
Description
n _{16-Bit Resolution}
n _{Internal, High Accuracy Reference—10ppm/°C (Max)}
n _{Single-Ended (LTC2470) or Differential (LTC2472)}
n _{Selectable 208sps/833sps Output Rate}
n _{1mV Offset Error}
n _{0.01% Gain Error}
n _{Single Conversion Settling Time for 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 _{SPI Interface}
n _{Small 12-Lead, 3mm × 3mm DFN and MSOP}
Packages
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 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.
The LTC^®2470/LTC2472 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 a
SPI Interface. The LTC2470 is single-ended with a 0V to
V_REF input range and the LTC2472 is differential with a
±V_REF input range. Both ADC’s 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 LTC2470/
LTC2472 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 LTC2470/LTC2472
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 LTC2470/LTC2472 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⁺
SCK
IN^–
LTC2472
SDO
CS
SPI
INTERFACE
10k
R
0.1µF
REF^–
GND
24702 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
24702 TA01b
For more information www.linear.com/LTC2470
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