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Linear Technology Electronic Components Datasheet

LTC2485 Datasheet

24-Bit ADC

No Preview Available !

Features
n Easy Drive™ Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n
n
G2-NWDirteoIV2CCCInInteprufat/cReeference
Common
Mode
Range
n Programmable 50Hz, 60Hz or Simultaneous
50Hz/60Hz Rejection Mode
n 2ppm (0.25LSB) INL, No Missing Codes
n 1ppm Offset and 15ppm Full-Scale Error
n Selectable 2x Speed Mode
n No Latency: Digital Filter Settles in a Single Cycle
n Single Supply 2.7V to 5.5V Operation
n Internal Oscillator
n Six Addresses Available and One Global Address for
Synchronization
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
LTC2485
24-Bit ∆Σ ADC with Easy Drive
Input Current Cancellation
and I2C Interface
Description
The LTC®2485 combines a 24-bit plus sign No Latency
Σ™ analog-to-digital converter with patented Easy Drive
technology and I2C digital interface. 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 LTC2485 includes an on-chip oscillator. The LTC2485
can be configured through an I2C interface to reject line
frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz
line frequency rejection can be selected as well as a 2x
speed-up mode.
The LTC2485 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 LTC2485 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, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆∑ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
VCC
0.1µF
1µF
10k
SENSE
10k
IDIFF = 0
0.1µF
VIN+ REF+
VCC
LTC2485
VIN–
GND
REF
SCL
SDA
CA0/f0
CA1
2485 TA01a
2-WIRE
I2C INTERFACE
6 ADDRESSES
+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 (Ω)
2485 TA01b
For more information www.linear.com/LTC2485
2485fd
1


Linear Technology Electronic Components Datasheet

LTC2485 Datasheet

24-Bit ADC

No Preview Available !

LTC2485
Absolute Maximum Ratings
(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
LTC2485C..................................................... 0°C to 70°C
LTC2485I .................................................– 40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Pin Configuration
REF+
VCC
REF
IN+
IN
1
2
3
4
5
TOP VIEW
10 CA0/f0
9 CA1
11 8 GND
7 SDA
6 SCL
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
LTC2485CDD#PBF
LTC2485CDD#TRPBF LBST
10-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC2485IDD#PBF
LTC2485IDD#TRPBF
LBST
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)
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)
2 10 ppm of VREF
1 ppm of VREF
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC (Note 13)
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
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
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 (Note 6)
5V ≤
2.7V
≤VCVCCC
≤5.55V.5,VV,RVERFE=F
=5V2,.5VVIN,(VCMIN)(C=M2).=5V1.(2N5oVte(N6)ote
6)
15 ppm of VREF
15
15
ppm
ppm
of
of
VVRREEFF
5V ≤ VCC ≤ 5.5V, VREF = 5V, GND ≤ IN= IN+ ≤ VCC (Note 12)
0.6
µVRMS
TA = 27°C
390 450
mV
2485fd
2 For more information www.linear.com/LTC2485


Part Number LTC2485
Description 24-Bit ADC
Maker Linear Technology
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LTC2485 Datasheet PDF





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