LTC2470 Datasheet, PDF (1/20 Pages) Linear Technology – System Monitoring

LTC2470/LTC2472
FEATURES
Selectable 250sps/1ksps,
16-Bit ΔΣ ADCs with 10ppm/°C
Max Precision Reference
DESCRIPTION
n _{16-Bit Resolution, No Missing Codes}
n _{Internal, High Accuracy Reference—10ppm/°C (Max)}
n _{Single-Ended (LTC2470) or Differential (LTC2472)}
n _{Selectable 250sps/1ksps 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 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 250sps or 1ksps 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 conver-
sions 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 250sps
or 1ksps output rate and due to a large oversampling
ratio (8,192 at 250sps and 2,048 at 1ksps) 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
24702f
1