LTC2470/LTC2472
Selectable 208sps/833sps,
16-Bit ΔΣ ADCs with 10ppm/°C
Max Precision Reference
DescripTion
FeaTures
TheLTC®2470/LTC2472aresmall,16-bitanalog-to-digital
n
16-Bit Resolution
n
Internal, High Accuracy Reference—10ppm/°C (Max)
Single-Ended (LTC2470) or Differential (LTC2472)
Selectable 208sps/833sps Output Rate
1mV Offset Error
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
VREF input range and the LTC2472 is differential with a
VREF input range. Both ADC’s include a 1.25V integrated
referencewith2ppm/°Cdriftperformanceand0.1%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
withnolatencyformultiplexedapplications.TheLTC2470/
LTC2472 include a proprietary input sampling scheme
that reduces the average input current several orders of
magnitude when compared to conventional delta sigma
converters.
n
n
n
n
n
0.01% Gain Error
Single Conversion Settling Time for Multiplexed
Applications
Single-Cycle Operation with Auto Shutdown
3.5mA (Typ) Supply Current
2µA (Max) Sleep Current
Internal Oscillator—No External Components
Required
SPI Interface
Small 12-Lead, 3mm × 3mm DFN and MSOP
Packages
n
n
n
n
n
n
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.
applicaTions
n
System Monitoring
n
Environmental Monitoring
n
Direct Temperature Measurements
n
Instrumentation
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.
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.
Typical applicaTion
VREF vs Temperature
1.2520
2.7V TO 5.5V
1.2515
1.2510
1.2505
1.2500
1.2495
1.2490
1.2485
1.2480
0.1µF
0.1µF
COMP
0.1µF
10µF
0.1µF
10k
REFOUT
V
CC
SCK
+
–
IN
10k
10k
SPI
INTERFACE
LTC2472
SDO
IN
CS
0.1µF
–
REF
GND
R
24702 TA01a
–50 –30 –10 10
30
50
70
90
TEMPERATURE (°C)
24702 TA01b
24702fb
For more information www.linear.com/LTC2470
1