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Linear Technology LTC2471 - Selectable 208sps/833sps, 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference (Req DC590B) Linear DC1718A Fiche De Données

Codes de produits
DC1718A
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LTC2471/LTC2473
1
24713fb
For more information 
–50
–10
10
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70
30
90
TEMPERATURE (°C)
REFERENCE OUTPUT VOL
TAGE (V)
1.2520
1.2515
1.2510
1.2505
1.2500
24713 TA01b
1.2480
1.2485
1.2490
1.2495
Typical applicaTion
FeaTures
applicaTions
DescripTion
Selectable 208sps/833sps,  
16-Bit I
2
C 
ΔΣ ADCs with 10ppm/°C 
Max Precision Reference
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 
I
2
C 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.
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.
V
REF
 vs Temperature
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
 I
2
C Interface
n
  Small 12-Lead, 3mm × 3mm DFN and MSOP 
Packages
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.
10k
10k
10k
R
SCL
I
2
C
INTERFACE
SDA
0.1µF
0.1µF
2.7V TO 5.5V
10µF
0.1µF
IN
+
REFOUT
REF
–
V
CC
0.1µF
COMP
GND
AO
IN
–
0.1µF
LTC2473
24713 TA01a