LTC2453_1 Datasheet, PDF (1/18 Pages) Linear Technology – Ultra-Tiny, Differential, 16-Bit ΔΣ ADC With I2C Interface

FEATURES
■ _{±VCC Differential Input Range}
■ _{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-Wire I}²_{C Interface}
■ _{Ultra-Tiny 8-Pin 3mm × 2mm DFN}
and TSOT23 Packages
APPLICATIONS
■ _{System Monitoring}
■ _{Environmental Monitoring}
■ _{Direct Temperature Measurements}
■ _{Instrumentation}
■ _{Industrial Process Control}
■ _{Data Acquisition}
■ _{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.
LTC2453
Ultra-Tiny, Differential,
16-Bit ΔΣ ADC With
I²C Interface
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. The ADC is available in an 8-pin, 3mm × 2mm DFN
package or 8-pin, 3mm × 3mm TSOT package. It includes
an integrated oscillator that does not require any external
components. It uses a delta-sigma modulator as a converter
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.
The LTC2453 can sample at 60 conversions per second,
and due to the very large oversampling ratio, has ex-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
converter has external REF⁺ and REF^– pins and the differential
input voltage range can extend up to ±(V_REF+ – V_REF–).
Following a single conversion, the LTC2453 can auto-matically
enter a sleep mode and reduce its power to less than 0.2μA. If
the user reads the ADC once a second, the LTC2453 consumes
an average of less than 50μW from a 2.7V supply.
TYPICAL APPLICATION
2.7V TO 5.5V
0.1μF
10μF
0.1μF
REF⁺ V_CC
IN⁺
SCL
10k
10k
IN^–
LTC2453
2-WIRE I²C
SDA INTERFACE
10k
R
0.1μF
REF^– GND
2453 TA01
Integral Nonlinearity, V_CC = 3V
2.0
1.5
VVV_CRRCEEFF=_+–
3V
= 3V
= 0V
1.0
0.5
T_A = –45°C, 25°C, 90°C
0
–0.5
–1.0
–1.5
–2.0
–3
–2 –1 0
1
2
DIFFERENTIAL INPUT VOLTAGE (V)
3
2453 TA01b
2453fb
1