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Linear Technology Electronic Components Datasheet

LTC2482 Datasheet

16-Bit Delta Sigma ADC

No Preview Available !

FEATURES
Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
www.DataSheet64U0.0cnomV RMS Noise, Independent of VREF
Operates with a Reference as Low as 100mV with
16-Bit Resolution
GND to VCC Input/Reference Common Mode Range
Simultaneous 50Hz/60Hz Rejection Mode
2ppm INL, No Missing Codes
1ppm Offset and 15ppm Total Unadjusted Error
No Latency: Digital Filter Settles in a Single Cycle
Single Supply 2.7V to 5.5V Operation
Internal Oscillator
Available in a Tiny (3mm × 3mm) 10-Lead
DFN Package U
APPLICATIO S
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Strain Gauge Transducers
Instrumentation
Industrial Process Control
DVMs and Meters
LTC2482
16-Bit ∆Σ ADC with
Easy Drive Input Current
Cancellation
DESCRIPTIO
The LTC®2482 combines a 16-bit plus sign No Latency
∆Σ™ analog-to-digital converter with patented Easy Drive™
technology. The patented sampling scheme eliminates
dynamic input current errors and the shortcomings of on-
chip buffering through automatic cancellation of differen-
tial input current. This allows large external source
impedances and input signals with rail-to-rail input range
to be directly digitized while maintaining exceptional DC
accuracy.
The LTC2482 allows a wide common mode input range
(0V to VCC) independent of the reference voltage. The
reference can be as low as 100mV or can be tied directly
to VCC. The noise level is 600nV RMS independent of VREF.
This allows direct digitization of low level signals with 16-
bit accuracy. The LTC2482 includes an on-chip trimmed
oscillator, eliminating the need for external crystals or
oscillators and provides 87dB rejection of 50Hz and 60Hz
line frequency noise. Absolute accuracy and low drift are
automatically maintained through continuous, transpar-
ent, offset and full-scale calibration.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patent pending.
TYPICAL APPLICATIO
VCC
1µF
10k
SENSE
10k
IDIFF = 0
1µF
VIN+ VREF
VCC
LTC2482
VIN–
GND
FO
SDO
SCK 3-WIRE
CS SPI INTERFACE
2482 TA01
+FS Error vs RSOURCE at IN+ and IN
80
VCC = 5V
60
40
VVVRIINNE+–F
=
=
=
5V
3.75V
1.25V
FO = GND
20 TA = 25°C
0
CIN = 1µF
–20
–40
–60
–80
1
10 100 1k 10k 100k
RSOURCE ()
2482 TA02
2482f
1


Linear Technology Electronic Components Datasheet

LTC2482 Datasheet

16-Bit Delta Sigma ADC

No Preview Available !

LTC2482
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
Supply Voltage (VCC) to GND ...................... – 0.3V to 6V
Analog Input Voltage to GND ....... – 0.3V to (VCC + 0.3V)
Reference Input Voltage to GND .. – 0.3V to (VCC + 0.3V)
Digital Input Voltage to GND ........ – 0.3V to (VCC + 0.3V)
Digital Output Voltage to GND ..... – 0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2482C ................................................... 0°C to 70°C
LTC2482I ................................................ – 40°C to 85°C
www.DataShSeteot4rUa.gceomTemperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
*GND
VCC
VREF
IN+
IN
1
2
3
4
5
10 FO
9 SCK
11 8 GND
7 SDO
6 CS
ORDER PART
NUMBER
LTC2482CDD
LTC2482IDD
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/ W
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
*PIN 1 MAY BE DRIVEN WITH A DIGITAL
SIGNAL IN ORDER TO REMAIN PIN
COMPATIBLE WITH THE LTC2480/LTC2484
DD PART MARKING**
LBSQ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
**The temperature grade is indicated by a label on the shipping container.
UW
ELECTRICAL CHARACTERISTICS ( OR AL SPEED) The denotes specifications which apply
over the full operating temperature range, otherwise specifications are TA = 25°C. (Notes 3, 4)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Resolution (No Missing Codes)
Integral Nonlinearity
Offset Error
Offset Error Drift
Positive Full-Scale Error
Positive Full-Scale Error Drift
Negative Full-Scale Error
Negative Full-Scale Error Drift
Total Unadjusted Error
Output Noise
0.1 VREF VCC, –FS VIN +FS (Note 5)
16
Bits
5V VCC 5.5V, VREF = 5V, VIN(CM) = 2.5V (Note 6)
2.7V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V (Note 6)
2.5V VREF VCC, GND IN+ = INVCC (Note 14)
2.5V VREF VCC, GND IN+ = INVCC
2.5V VREF VCC, IN+ = 0.75VREF, IN= 0.25VREF
2.5V VREF VCC, IN+ = 0.75VREF, IN= 0.25VREF
2.5V VREF VCC, IN+ = 0.75VREF, IN= 0.25VREF
2 20 ppm of VREF
1 ppm of VREF
0.5 5
µV
10 nV/°C
32 ppm of VREF
0.1 ppm of
VREF/°C
32 ppm of VREF
2.5V VREF VCC, IN+ = 0.75VREF, IN= 0.25VREF
0.1 ppm of
VREF/°C
5V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V
5V VCC 5.5V, VREF = 5V, VIN(CM) = 2.5V
2.7V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V
5V VCC 5.5V, VREF = 5V, GND IN= IN+ VCC (Note 13)
15 ppm of VREF
ppm of VREF
ppm of VREF
0.6 µVRMS
2482f
2


Part Number LTC2482
Description 16-Bit Delta Sigma ADC
Maker Linear Technology
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LTC2482 Datasheet PDF





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