LTC2453
Ultra-Tiny, Differential,
16-Bit ΔΣ ADC With
2
I C Interface
FEATURES
DESCRIPTION
The LTC®2453 is an ultra-tiny, fully differential, 16-bit,
analog-to-digital converter. The LTC2453 uses a single
2.7V to 5.5V supply and communicates through an I2C
interface.TheADCisavailableinan8-pin,3mm×2mmDFN
package or 8-pin, 3mm × 3mm TSOT package. It includes
an integrated oscillator that does not require any external
components.Itusesadelta-sigmamodulatorasaconverter
core and has no latency for multiplexed applications. The
LTC2453 includes a proprietary input sampling scheme
that reduces the average input sampling current several
orders of magnitude lower than conventional delta-sigma
converters. Additionally, due to its architecture, there is
negligible current leakage between the input pins.
■
±± Differential Input Range
CC
■
16-Bit Resolution (Including Sign), No Missing Codes
■
2LSB Offset Error
4LSB Full-Scale Error
60 Conversions Per Second
■
■
■
Single Conversion Settling Time for Multiplexed
Applications
■
Single-Cycle Operation with Auto Shutdown
■
800μA Supply Current
0.2μA Sleep Current
■
■
Internal Oscillator—No External Components Required
2
■
2-Wire I C Interface
■
Ultra-Tiny 8-Pin 3mm × 2mm DFN
and TSOT23 Packages
The LTC2453 can sample at 60 conversions per second,
andduetotheverylargeoversamplingratio,hasex-tremely
relaxed antialiasing requirements. The LTC2453 includes
continuous internal offset and full-scale calibration algo-
rithms which are transparent to the user, ensuring accuracy
over time and over the operating temperature range. The
APPLICATIONS
■
System Monitoring
■
Environmental Monitoring
■
Direct Temperature Measurements
+
–
■
Instrumentation
converterhasexternalREF andREF pinsandthedifferential
+
–
■
Industrial Process Control
input voltage range can extend up to (V
– V
).
REF
REF
■
Data Acquisition
Followingasingleconversion,theLTC2453canauto-matically
enterasleepmodeandreduceitspowertolessthan0.2μA.If
theuserreadstheADConceasecond,theLTC2453consumes
an average of less than 50μW from a 2.7V supply.
■
Embedded ADC Upgrades
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. No Latency ΔΣ 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.
Integral Nonlinearity, ±CC = 3±
TYPICAL APPLICATION
2.0
V
V
V
= 3V
CC
+
= 3V
= 0V
REF
REF
1.5
1.0
0.5
–
2.7V TO 5.5V
0.1μF
10μF
T
= –45°C, 25°C, 90°C
+
A
0.1μF
0.1μF
REF
REF
V
CC
+
–
IN
IN
0
SCL
SDA
10k
10k
10k
R
2
2-WIRE I C
–0.5
LTC2453
GND
INTERFACE
–1.0
–1.5
–2.0
–
2453 TA01
–2
–1
1
–3
2
3
0
DIFFERENTIAL INPUT VOLTAGE (V)
2453 TA01b
2453fb
1