LTC2471/LTC2473
Selectable 250sps/1ksps,
2
16-Bit I C ΔΣ ADCs with 10ppm/°C
Max Precision Reference
DESCRIPTION
FEATURES
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16-Bit Resolution, No Missing Codes
TheLTC®2471/LTC2473aresmall,16-bitanalog-to-digital
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Internal, High Accuracy Reference—10ppm/°C (Max)
Single-Ended (LTC2471) or Differential (LTC2473)
Selectable 250sps/1ksps Output Rate
1mV Offset Error
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 an
I2C Interface. The LTC2471 is single-ended with a 0V to
VREF input range and the LTC2473 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 conver-
sions 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.
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0.01% Gain Error
Single Conversion Settling Time Simplifies
Multiplexed Applications
Single-Cycle Operation with Auto Shutdown
3.5mA (Typ) Supply Current
2μA (Max) Sleep Current
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Internal Oscillator—No External Components
Required
2
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I C Interface
Small 12-Lead, 3mm × 3mm DFN and MSOP
Packages
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.
APPLICATIONS
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System Monitoring
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Environmental Monitoring
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Direct Temperature Measurements
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Instrumentation
The LTC2471/LTC2473 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.
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Industrial Process Control
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Data Acquisition
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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.
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
SCL
SDA
+
–
2
IN
I C
INTERFACE
10k
10k
LTC2473
AO
IN
0.1μF
–
REF
GND
R
24713 TA01a
–50 –30 –10 10
30
50
70
90
TEMPERATURE (°C)
24713 TA01b
24713f
1