下载
LTC2471/LTC2473
1
24713fb
For more information www.linear.com/LTC2471
–50 –10 10–30 50 7030 90
TEMPERATURE (°C)
REFERENCE OUTPUT VOLTAGE (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
The LTC
®
2471/LTC2473 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 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
