LTC2450-1_15 Datasheet, PDF (1/20 Pages) Linear Technology – Easy-to-Use, Ultra-Tiny 16-Bit ADC

FEATURES
n _{GND to VCC Single-Ended Input Range}
n _{60 Conversions Per Second}
n _{0.02LSB RMS Noise}
n _{16-Bits, No Missing Codes}
n _{0.5mV Offset Error}
n _{4LSB Full-Scale Error}
n _{Single Conversion Settling Time for Multiplexed}
Applications
n _{Single Cycle Operation with Auto Shutdown}
n _{350μA Supply Current}
n _{50nA Sleep Current}
n _{Internal Oscillator—No External Components}
Required
n _{Single Supply, 2.7V to 5.5V Operation}
n _{SPI Interface}
n _{Ultra-Tiny, 2mm × 2mm DFN Package}
APPLICATIONS
n _{System Monitoring}
n _{Environmental Monitoring}
n _{Direct Temperature Measurements}
n _{Instrumentation}
n _{Industrial Process Control}
n _{Data Acquisition}
n _{Embedded ADC Upgrades}
LTC2450-1
Easy-to-Use, Ultra-Tiny
16-Bit Δ∑ ADC
DESCRIPTION
The LTC^®2450-1 is a low power, ultra-tiny 16-bit analog-
to-digital converter designed for space constrained ap-
plications requiring 16-bit performance. The LTC2450-1
uses a single 2.7V to 5.5V supply, accepts a single-ended
analog input voltage, and communicates through an SPI
interface. It includes an integrated oscillator that does
not require any external components. The delta-sigma
modulator converter core provides single-cycle settling
time for multiplexed applications. The converter is avail-
able in a 6-pin, 2mm × 2mm DFN package. The LTC2450-1
implements a proprietary input sampling scheme that
reduces the average input sampling current several orders
of magnitude.
The LTC2450-1 is capable of up to 60 conversions per
second and, due to the very large oversampling ratio, has
extremely relaxed antialiasing requirements. The converter
uses its power supply voltage as the reference voltage and
the single-ended, rail-to-rail input voltage range extends
from GND to V_CC.
Following a conversion, the LTC2450-1 can automatically
enter a sleep mode and reduce its power to less than
500nA. At an output rate of 1Hz, the LTC2450-1 consumes
an average of less than 25μW from a 2.7V supply.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Easy Drive
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.
TYPICAL APPLICATION
0.1μF
2.7 TO 5.5V
10μF
CLOSE TO
1k CHIP
V_IN
SENSE
0.1μF
V_CC
LTC2450-1
GND
CS
SCK
SDO
24501 TA01
3-WIRE SPI
INTERFACE
Integral Nonlinearity
3.0
2.5 ^{VCC = VREF = 3V}
2.0
1.5
1.0
0.5
0
T_A = –45°C, 25°C, 90°C
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
0
0.5 1.0 1.5 2.0 2.5 3.0
INPUT VOLTAGE (V)
24501 G02
24501fc
1