鈻?/div>
DESCRIPTIO
Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
Programmable Gain from 1 to 256
Integrated Temperature Sensor
GND to V
CC
Input/Reference Common Mode Range
Programmable 50Hz, 60Hz or Simultaneous
50Hz/60Hz Rejection Mode
2ppm (0.25LSB) INL, No Missing Codes
1ppm Offset and 15ppm Full-Scale Error
Selectable 2x Speed Mode (15Hz Using Internal
Oscillator)
No Latency: Digital Filter Settles in a Single Cycle
Single Supply 2.7V to 5.5V Operation
Internal Oscillator
Available in a Tiny (3mm
脳
3mm) 10-Lead
DFN Package
The LTC
廬
2480 combines a 16-bit plus sign No Latency
鈭單?/div>
TM
analog-to-digital converter with patented Easy Drive
TM
tech-
nology. The patented sampling scheme eliminates dynamic
input current errors and the shortcomings of on-chip buff-
ering 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 digi-
tized while maintaining exceptional DC accuracy.
The LTC2480 includes on-chip programmable gain, a
temperature sensor and an oscillator. The LTC2480 can be
configured to provide a programmable gain from 1 to 256
in 8 steps, measure an external signal or internal tempera-
ture sensor and reject line frequencies. 50Hz, 60Hz or
simultaneous 50Hz/60Hz line frequency rejection can be
selected as well as a 2x speed-up mode.
The LTC2480 allows a wide common mode input range
(0V to V
CC
) independent of the reference voltage. The
reference can be as low as 100mV or can be tied directly
to V
CC
. The LTC2480 includes an on-chip trimmed oscil-
lator eliminating the need for external crystals or oscilla-
tors. Absolute accuracy and low drift are automatically
maintained through continuous, transparent, offset and
full-scale calibration.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
鈭單?/div>
and Easy Drive are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Patent Pending.
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Strain Gauge Transducers
Instrumentation
Industrial Process Control
DVMs and Meters
TYPICAL APPLICATIO
V
CC
+FS Error vs R
SOURCE
at IN
+
and IN
鈥?/div>
V
CC
= 5V
60 V
REF
= 5V
V
IN+
= 3.75V
V
IN鈥?/div>
= 1.25V
40
F
O
= GND
20 T
A
= 25擄C
C
IN
= 1碌F
0
鈥?0
鈥?0
鈥?0
鈥?0
1
10
100
1k
R
SOURCE
(鈩?
10k
100k
2480 TA04
80
10k
SENSE
10k
I
DIFF
= 0
1碌F
V
IN+
V
REF
LTC2480
V
CC
SDI
SDO
SCK
4-WIRE
SPI INTERFACE
V
IN鈥?/div>
GND
F
O
CS
2480 TA01
+FS ERROR (ppm)
1碌F
U
2480f
U
U
1
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