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Linear Technology Electronic Components Datasheet

LTC2450 Datasheet

Ultra-Tiny 16-Bit Delta Sigma ADC

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LTC2450 pdf
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FEATURES
GND to VCC Single-Ended Input Range
0.02LSB RMS Noise
2LSB INL, No Missing Codes
2LSB Offset Error
4LSB Full-Scale Error
Single Conversion Settling Time for Multiplexed
Applications
Single Cycle Operation with Auto Shutdown
350μA Supply Current
50nA Sleep Current
30 Conversions Per Second
Internal Oscillator—No External Components
Required
Single Supply, 2.7V to 5.5V Operation
SPI Interface
Ultra-Tiny 2mm × 2mm DFN Package
APPLICATIONS
System Monitoring
Environmental Monitoring
Direct Temperature Measurements
Instrumentation
Industrial Process Control
Data Acquisition
Embedded ADC Upgrades
, 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.
TYPICAL APPLICATION
CLOSE TO
1k CHIP
VIN
SENSE
0.1μF
0.1μF
10μF
VCC
LTC2450
GND
CS
SCK
SDO
2450 TA01
3-WIRE SPI
INTERFACE
LTC2450
Easy-to-Use, Ultra-Tiny
16-Bit ΔΣ ADC
DESCRIPTION
The LTC®2450 is an ultra-tiny 16-bit analog-to-digital
converter. The LTC2450 uses a single 2.7V to 5.5V supply,
accepts a single-ended analog input voltage, and commu-
nicates through an SPI interface. It includes an integrated
oscillator that does not require any external components.
It uses a delta-sigma modulator as a converter core and
provides single-cycle settling time for multiplexed applica-
tions. The converter is available in a 6-pin, 2mm × 2mm
DFN package. The internal oscillator does not require any
external components. The LTC2450 includes a proprietary
input sampling scheme that reduces the average input
sampling current several orders of magnitude.
The LTC2450 is capable of up to 30 conversions per
second and, due to the very large oversampling ratio, has
extremely relaxed antialiasing requirements. The LTC2450
includes continuous internal offset and full-scale calibration
algorithms which are transparent to the user, ensuring
accuracy over time and over the operating temperature
range. 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 VCC.
Following a conversion, the LTC2450 can automatically
enter a sleep mode and reduce its power to less than
200nA. If the user samples the ADC once a second, the
LTC2450 consumes an average of less than 50μW from
a 2.7V supply.
Integral Nonlinearity, VCC = 3V
3.0
2.5 VCC = VREF = 3V
2.0
1.5
1.0
0.5
0 TA = –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)
2450 G02
2450f
1


Linear Technology Electronic Components Datasheet

LTC2450 Datasheet

Ultra-Tiny 16-Bit Delta Sigma ADC

No Preview Available !

LTC2450 pdf
www.DataSheet4U.com
LTC2450
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC) ................................... –0.3V to 6V
Analog Input Voltage (VIN) ............ –0.3V to (VCC + 0.3V)
Digital Input Voltage......................–0.3V to (VCC + 0.3V)
Digital Output Voltage ...................–0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2450C ................................................ 0°C to 70°C
LTC2450I ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10sec) ................... 300°C
PIN CONFIGURATION
TOP VIEW
VCC 1
6 SCK
VIN 2 7 5 SDO
GND 3
4 CS
DC PACKAGE
6-LEAD (2mm x 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 60°C/W to 85°C/W
EXPOSED PAD (PIN7) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2450CDC#TRMPBF
LTC2450IDC#TRMPBF
TAPE AND REEL
LTC2450CDC#TRPBF
LTC2450IDC#TRPBF
PART MARKING
LCTR
LCTR
PACKAGE DESCRIPTION
6-Lead (2mm × 2mm) Plastic DFN
6-Lead (2mm × 2mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Resolution (No missing codes)
(Note 3)
16
Bits
Integral Nonlinearity
(Note 4)
2 10
LSB
Offset Error
28
LSB
Offset Error Drift
0.02 LSB/°C
Gain Error
0.01 0.02 % of FS
Gain Error Drift
0.02 LSB/°C
Transition Noise
Power Supply Rejection DC
100Hz-100kHz
1.4 μVRMS
80 dB
ANALOG INPUT The denotes the specifications which apply over the full operating temperature range,otherwise
specifications are at TA = 25°C.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Input Voltage Range
0
VCC
CIN IN Sampling Capacitance
0.35 pF
IDC_LEAK (VIN)
ICONV
IN DC Leakage Current
Input Sampling Current (Note 9)
VIN = GND (Note 5)
VIN = VCC (Note 5)
–10
–10
1
1
50
10
10
nA
nA
nA
2450f
2


Part Number LTC2450
Description Ultra-Tiny 16-Bit Delta Sigma ADC
Maker Linear Technology
Total Page 20 Pages
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