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Linear Technology Electronic Components Datasheet

LTC2484 Datasheet

24-Bit Delta Sigma ADC

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LTC2484
24-Bit ∆Σ ADC with
Easy Drive Input Current Cancellation
Features
Description
n Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n 600nVRMS Noise
n GND to VCC Input/Reference Common Mode Range
n Programmable 50Hz, 60Hz or Simultaneous
50Hz/60Hz Rejection Mode
n 2ppm INL, No Missing Codes
n 1ppm Offset and 15ppm Total Unadjusted Error
n Selectable 2× Speed Mode (15Hz Using Internal
Oscillator)
n No Latency: Digital Filter Settles in a Single Cycle
n Single Supply 2.7V to 5.5V Operation
n Internal Oscillator
n Available in a Tiny (3mm × 3mm) 10-Lead
DFN Package
Applications
n Direct Sensor Digitizer
n Weight Scales
n Direct Temperature Measurement
n Strain Gauge Transducers
n Instrumentation
n Industrial Process Control
n DVMs and Meters
The LTC®2484 combines a 24-bit 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 differential 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 LTC2484 includes an on-chip oscillator. The LTC2484
can be configured to reject line frequencies. 50Hz, 60Hz
or simultaneous 50Hz/60Hz line frequency rejection can
be selected as well as a 2× speed-up mode.
The LTC2484 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 LTC2484 includes an on-chip trimmed oscil-
lator, eliminating the need for external crystals or oscil-
lators. Absolute accuracy and low drift are automatically
maintained through continuous, transparent, offset and
full-scale calibration.
L, LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Patents pending.
Typical Application
VCC
0.1µF
10k
SENSE
IDIFF = 0
10k
0.1µF
VIN+ VREF
VCC
LTC2484
VIN–
GND
fO
1µF
SDI
SDO
SCK
CS
2484 TA01
4-WIRE
SPI INTERFACE
+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
CIN = 1µF
0
–20
–40
–60
–80
1
10 100 1k 10k 100k
RSOURCE (Ω)
2484 TA02
For more information www.linear.com/LTC2484
2484ff
1


Linear Technology Electronic Components Datasheet

LTC2484 Datasheet

24-Bit Delta Sigma ADC

No Preview Available !

LTC2484
Absolute Maximum Ratings
(Note 1)
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
LTC2484C................................................ 0°C to 70°C
LTC2484I ............................................–40°C to 85°C
Storage Temperature Range.................. –65°C to 125°C
Pin Configuration
TOP VIEW
SDI 1
10 fO
VCC
VREF
IN+
2
3
4
11
GND
9 SCK
8 GND
7 SDO
IN5
6 CS
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
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2484CDD#PBF
LTC2484CDD#TRPBF LBSS
10-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC2484IDD#PBF
LTC2484IDD#TRPBF
LBSS
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
E lectrical Characteristics (Normal Speed) The l denotes the specifications which
apply over the full operating temperature range, otherwise specifications are at 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
Internal PTAT Signal
0.1 ≤ VREF ≤ VCC, –FS ≤ VIN ≤ +FS (Note 5)
l 24
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)
l
2 10 ppm of VREF
1 ppm of VREF
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC (Note 14)
l
0.5 2.5
µV
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC
10 nV/°C
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF , IN= 0.25VREF
l
25 ppm of VREF
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF , IN= 0.25VREF
0.1 ppm of
VREF/°C
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF , IN= 0.25VREF
l
25 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
15 ppm of VREF
ppm of VREF
ppm of VREF
5V ≤ VCC ≤ 5.5V, VREF = 5V, GND ≤ IN= IN+ ≤ VCC (Note 13)
0.6
µVRMS
TA = 27°C
390 450 mV
2484ff
2 For more information www.linear.com/LTC2484


Part Number LTC2484
Description 24-Bit Delta Sigma ADC
Maker Linear Technology
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LTC2484 Datasheet PDF






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