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Linear Technology LTC2480, 16-Bit Differential ADC with Programmable Gain and Temperature Sensor (req DC590) DC798B DC798B Fiche De Données

Codes de produits
DC798B
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LTC2480

2480fd
Typical applicaTion
FeaTures
applicaTions
DescripTion
16-Bit 
∆Σ ADC with Easy Drive 
Input Current Cancellation
The LTC
®
2480 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 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  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 
temperature 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 oscil-
lators. Absolute accuracy and low drift are automatically 
maintained through continuous, transparent, offset and 
full-scale calibration.
+FS Error vs R
SOURCE
 at IN
+
 and IN
–
n
  Easy Drive Technology Enables Rail-to-Rail Inputs    
with Zero Differential Input Current
n
  Directly Digitizes High Impedance Sensors with 
  Full Accuracy
n
  Programmable Gain from 1 to 256
n
  Integrated Temperature Sensor
n
  GND to V
CC
 Input/Reference 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 (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 and 10-Lead MSOP Package
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
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.
R
SOURCE
 (Ω)
1
+FS ERROR (ppm)
–20
0
20
1k
100k
2480 TA04
–40
–60
–80
10
100
10k
40
60
80
V
CC
 = 5V
V
REF
 = 5V
V
IN
+
 = 3.75V
V
IN
–
 = 1.25V
f
O
 = GND
T
A
 = 25°C
C
IN
 = 1µF
LTC2480
V
IN
+
V
REF
V
CC
V
CC
GND
f
O
V
IN
–
1µF
SDO
4-WIRE
SPI INTERFACE
10k
I
DIFF
 = 0
10k
SCK
2480 TA01
CS
SDI
0.1µF
0.1µF
SENSE