LTC2452_11 Datasheet, PDF (1/22 Pages) Linear Technology – Ultra-Tiny, Differential, 16-Bit ADC with SPI Interface SPI Interface

FEATURES
n _{±VCC Differential Input Range}
n _{16-Bit Resolution (Including Sign), No Missing}
Codes
n _{2LSB Offset Error}
n _{4LSB Full-Scale Error}
n _{60 Conversions Per Second}
n _{Single Conversion Settling Time for Multiplexed}
Applications
n _{Single-Cycle Operation with Auto Shutdown}
n _{800µA Supply Current}
n _{0.2µA Sleep Current}
n _{Internal Oscillator—No External Components}
Required
n _{SPI Interface}
n _{Ultra-Tiny 3mm × 2mm DFN and TSOT-23 Packages}
APPLICATIONS
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 and No
Latency ∆Σ 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.
LTC2452
Ultra-Tiny, Differential, 16-Bit
ΔΣ ADC with SPI Interface
DESCRIPTION
The LTC^®2452 is an ultra-tiny, fully differential, 16-bit,
analog-to-digital converter. The LTC2452 uses a single
2.7V to 5.5V supply and communicates through an SPI
interface. The ADC is available in an 8-pin, 3mm × 2mm
DFN package or TSOT-23 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 LTC2452
includes a proprietary input sampling scheme that reduces
the average input sampling current several orders of
magnitude when compared to conventional delta-sigma
converters. Additionally, due to its architecture, there is
negligible current leakage between the input pins.
The LTC2452 can sample at 60 conversions per second,
and due to the very large oversampling ratio, has extremely
relaxed antialiasing requirements. The LTC2452 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 an external REF pin and the differential input
voltage range can extend up to ±V_REF .
Following a single conversion, the LTC2452 can automati-
cally enter a sleep mode and reduce its supply current to
less than 0.2µA. If the user reads the ADC once a second,
the LTC2452 consumes an average of less than 50µW
from a 2.7V supply.
TYPICAL APPLICATION
0.1µF
2.7V TO 5.5V
10µF
0.1µF
REF V_CC
IN⁺
CS
10k
10k
IN^–
LTC2452
SCK 3-WIRE SPI
SDO ^INTERFACE
10k
R
0.1µF
GND
2452 TA01a
Integral Nonlinearity, V_CC = 3V
3
2
1
T_A = –45°C, 25°C, 90°C
0
–1
–2
–3
–3
–2 –1 0
1
2
3
DIFFERENTIAL INPUT VOLTAGE (V)
2452 TA01b
2452fc
1